27,554 results match your criteria brown coal

The in-situ effect of HS on the decomposition of natural rubber and catalyst activity.

Chemosphere 2021 Jun 18;283:131252. Epub 2021 Jun 18.

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 430074, Wuhan, Hubei, China.

In this work, the pyrolysis of natural rubber (NR) under N and HS atmosphere was performed to illustrate the possible effect of HS on NR decomposition with and without catalysts. A molecular dynamics simulation based on reactive force field (ReaxFF) was also conducted to understand the interaction mechanism between HS and intermediates from NR decomposition. Furthermore, the catalytic decomposition of NR under HS atmosphere and the adsorption characteristics of HS by zeolites alone were also carried out to investigate the effect of catalysts on sulfur behavior and the reversed effect of HS on catalyst activity. Read More

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On the state of the art of crystalline structure reconstruction of coal fly ash: A focus on zeolites.

Chemosphere 2021 Jun 8;283:131010. Epub 2021 Jun 8.

School of Environment, Tsinghua University, Beijing, 100084, China. Electronic address:

Coal fly ash (CFA) is fine particles generated from coal combustion, and large amount of CFA causes environmental pollution. Traditionally, CFA is added into construction materials, which has realized effective reduction. As the exploration of CFA properties goes deeper, finer utilization has been studied to maximize the recycling of CFA. Read More

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Economy and carbon emissions optimization of different countries or areas in the world using an improved Attention mechanism based long short term memory neural network.

Sci Total Environ 2021 Jun 16;792:148444. Epub 2021 Jun 16.

College of Information Science & Technology, Beijing University of Chemical Technology, Beijing, China; Engineering Research Center of Intelligent PSE, Ministry of Education in China, Beijing, China. Electronic address:

The combustion of fossil fuels produces a large amount of carbon dioxide (CO), which leads to global warming in the world. How to rationally consume fossil energy and control CO emissions has become an unavoidable problem for human beings while vigorously developing economy. This paper proposes a novel economy and CO emissions prediction model using an improved Attention mechanism based long short term memory (LSTM) neural network (Attention-LSTM) to analyze and optimize the energy consumption structures in different countries or areas. Read More

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In-situ ZnO template preparation of coal tar pitch-based porous carbon-sheet microsphere for supercapacitor.

J Colloid Interface Sci 2021 Jun 9;602:721-731. Epub 2021 Jun 9.

Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of China, Key Laboratory of Chemical Engineering Processes & Technology for High-efficiency Conversion (College of Heilongjiang Province), School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, China. Electronic address:

Three-dimension (3D) porous carbon-sheet microspheres (PCSMs) are prepared through coating coal tar pitch on basic zinc carbonate microspheres followed by in situ ZnO template carbonization and KOH activation. The as-prepared PCSMs show microsphere morphology composed of petal-like carbon nanosheets, which have large specific area (1359.88-2059. Read More

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Additions of optimum water, spent mushroom compost and wood biochar to improve the growth performance of Althaea rosea in drought-prone coal-mined spoils.

J Environ Manage 2021 Jun 18;295:113076. Epub 2021 Jun 18.

Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China. Electronic address:

Ecosystem degradation as a result of coal mining is a common phenomenon in various regions of the world, especially in arid and semi-arid zones. The implementation of appropriate revegetation techniques can be considered crucial to restore these degraded areas. In this regard, the additions of spent mushroom compost (SMC) and wood biochar (WB) to infertile and degraded soils have been reported to enhance soil fertility and plant growth under water (W) deficit conditions. Read More

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Analysis of serum metabolome of workers occupationally exposed to hexavalent chromium: A preliminary study.

Toxicol Lett 2021 Jun 18. Epub 2021 Jun 18.

Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing, 100191, China. Electronic address:

Hexavalent chromium (Cr(VI)) compound is considered as a common environmental and occupational pollutant due to widespread application in industry and agriculture. Cr(VI) as a carcinogen poses a serious threat to human health and the underlying mechanisms need further investigation. Previous studies had demonstrated the characteristic expression profiling after Cr(VI) treatment in vitro and in vivo at the levels of gene and protein. Read More

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Evolution of Ecosystem Service Value and Ecological Storage Estimation in Huainan Coal Mining Area.

Bull Environ Contam Toxicol 2021 Jun 21. Epub 2021 Jun 21.

Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Hefei, Anhui Province, China.

With the long-term mining activation and use of coal, ecological environment of mining area has been damaged to a certain extent. As one of the 13 large coal bases in China, Huainan coal mining area was selected to evaluate the ecosystem service value and ecological storage value. Remote sensing images of 2000, 2005, 2010 and 2015 based on Landsat series in Huainan mining area were employed to obtain the classification information of the surface. Read More

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Simple Strategy for Synthesizing LiNiCoAlO Using CoAl-LDH Nanosheet-Coated Ni(OH) as the Precursor: Dual Effects of the Buffer Layer and Synergistic Diffusion.

ACS Appl Mater Interfaces 2021 Jun 21. Epub 2021 Jun 21.

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.

Ni-rich layered oxide LiNiCoAlO is a promising cathode material for high-power lithium-ion batteries due to its high energy density and low cost. However, obtaining LiNiCoAlO with a large and uniform particle size and without undesired Al-related phases using some conventional synthesis methods is quite difficult. These problems seriously affect the electrochemical performance of LiNiCoAlO, thus impeding its wide application. Read More

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Tuning the Mechanical and Electrical Properties of Porous Electrodes for Architecting 3D Microsupercapacitors with Batteries-Level Energy.

Adv Sci (Weinh) 2021 Jun 20:e2004957. Epub 2021 Jun 20.

Micro-/Nano-technology Research Center, State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.

Microsupercapacitors (MSCs) are vital power sources for internet of things (IoTs) and miniaturized electronics. The performance of MSCs is often restricted by its low areal energy density, which is due to the low areal mass loading of active materials. Constructing thick planar microelectrode with fine structure and high aspect ratio is an efficient way to increase mass loading, but limited by the breakable nature of porous electrode materials. Read More

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Effect of local metakaolin developed from natural material soorh and coal bottom ash on fresh, hardened properties and embodied carbon of self-compacting concrete.

Environ Sci Pollut Res Int 2021 Jun 21. Epub 2021 Jun 21.

Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan.

The carbon dioxide emissions from Portland cement production have increased significantly, and Portland cement is the main binder used in self-compacting concrete, so there is an urgent need to find environmentally friendly materials as alternative resources. In most developing countries, the availability of huge amounts of agricultural waste has paved the way for studying how these materials can be processed into self-compacting concrete as binders and aggregate compositions. Therefore, this experimental program was carried out to study the properties of self-compacting concrete (SCC) made with local metakaolin and coal bottom ash separately and combined. Read More

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Advanced Exergy Analysis for a Novel Gasoline Absorption-Stabilization Process.

ACS Omega 2021 Jun 28;6(23):15332-15347. Epub 2021 May 28.

Center for Energy Resources Engineering, Department of Chemistry, Technical University of Denmark, Lyngby 2800, Denmark.

The advanced exergy analysis can identify the improved potential of each component and the interaction among components of the refining processes. In this work, a new gasoline absorption-stabilization process (GASP) is proposed for better energy utilization considering the absorption process intensification, which can be further explained using exergy analysis. Both conventional and new GASPs are simulated in PRO/II, which are verified with the actual plant operation data. Read More

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Effect of Abrupt Changes in the Cross-Sectional Area of a Pipe on Flame Propagation Characteristics of CH/Air Mixtures.

ACS Omega 2021 Jun 1;6(23):15126-15135. Epub 2021 Jun 1.

School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China.

To study the flame propagation characteristics of methane/air premixed gas in the pipeline with a sudden change of the pipe cross-sectional area, six kinds of customized pipes are used to study the methane/air premixed gas with a concentration of 9.5%. The results show that when the initial smooth flame front encounters an abrupt change in the cross-sectional area, the flame front becomes disordered and a turbulent flame is formed. Read More

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Thermal Properties and Key Groups Evolution of Low-Temperature Oxidation for Bituminous Coal under Lean-Oxygen Environment.

ACS Omega 2021 Jun 2;6(23):15115-15125. Epub 2021 Jun 2.

School of Safety Science and Engineering, Henan Polytechnic University (HPU), 2001, Century Avenue, Jiaozuo, Henan 454000, China.

To deeply explore the spontaneous combustion disaster of coal caused by air leakage and oxygen supply, low-temperature coal oxidation experiments under different oxygen concentrations (DOC) were carried out. Within the coal spontaneous combustion characteristic measurement system, a synchronous thermal analyzer (STA) and a Fourier transform infrared spectrometer (FTIR), the macro laws of gas and heat generation under DOC are analyzed, and the mechanism of the development of coal spontaneous combustion restricted by the lean-oxygen environment is also revealed. The results show that the change of oxygen concentration (OC) does not affect the critical temperature value and gas index change trend, but the lean-oxygen environment reduces the gas concentration and heat production rate very obviously. Read More

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Molecular Dynamics Simulation of Ion Adsorption and Ligand Exchange on an Orthoclase Surface.

ACS Omega 2021 Jun 4;6(23):14952-14962. Epub 2021 Jun 4.

School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China.

Orthoclase (K-feldspar) is one of the natural inorganic materials, which shows remarkable potential toward removing heavy metal ions from aqueous solutions. Understanding the interactions of the orthoclase and metal ions is important in the treatment of saline wastewater. In this paper, molecular dynamics simulations were used to prove the adsorption of different ions onto orthoclase. Read More

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A General Route of Using Lignite Depolymerized Derivatives for Catalyst Construction: Insights into the Effects of the Derivative Structures and Solvents.

ACS Omega 2021 Jun 4;6(23):14926-14937. Epub 2021 Jun 4.

Chemical Engineering, Inner Mongolia University of Technology; Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources, Hohhot 010051, Inner Mongolia, China.

Depolymerization is an emerging and promising route for the value-added utilization of low-rank coal (LRC) resources, and how to use the complex depolymerized mixtures efficiently is of great importance for this route. In this work, we designed the rational route of using depolymerized mixtures from lignite ruthenium ion-catalyzed oxidation (RICO) depolymerization directly without complex separation to construct a Zr-based hydrogenation catalyst. The prepared catalyst was applied into the catalytic transfer hydrogenation of biomass-derived carbonyl compounds. Read More

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Experimental Investigation of the Basic Characteristics and Wettability of Oil Shale Dust.

ACS Omega 2021 Jun 2;6(23):14788-14795. Epub 2021 Jun 2.

School of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China.

To investigate the influence of basic characteristics of oil shale dust on wet dust removal, oil shales (Longkou oil shales Y, YS, and YS and Fushun oil shale) with different oil contents, brown coal (M), and bituminous coal (M) were selected from a typical mining area in China to test their physiochemical parameters. Their proximate component, chemical structures, surface morphology, and mineral contents were determined. The sedimentation experiments of oil shale dust and coal dust were implemented using three anionic surfactants (AOS, SDS, and SDBS) and a nonionic surfactant (AEO-9), and the wettability of oil shale dust was analyzed and compared with that of coal dust. Read More

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Effect of Swelling by Organic Solvent on Structure, Pyrolysis, and Methanol Extraction Performance of Hefeng Bituminous Coal.

ACS Omega 2021 Jun 3;6(23):14765-14773. Epub 2021 Jun 3.

Key Laboratory of Coal Clean Conversion & Chemical Engineering Process (Xinjiang Uyghur Autonomous Region), College of Chemical Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China.

-methyl-2-pyrrolidone (NMP), pyridine (Py), tetrahydrofuran (THF), and tetralin (THN) were used to swell Hefeng acid-washed bituminous coal (HBC). The swelling effect on HBC by each solvent is different, among which NMP presented well swelling performance, with a swelling degree of 2.11. Read More

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The assessment of two different pollutants dispersion from a coal-fired power plant for various thermal regimes.

J Environ Health Sci Eng 2021 Jun 3;19(1):959-983. Epub 2021 May 3.

al-Farabi Kazakh National University, Almaty, Republic of Kazakhstan.

In this study, numerical simulations of the movement and emissions dispersion of two pollutants (sulfur dioxide(SO) and carbon dioxide(CO)) into the atmospheric boundary layer were considered under natural atmospheric conditions. To test the numerical algorithm and to select the optimal turbulent model, the test problem was solved numerically. The obtained computational data were compared with measurement data and values from the computation of other authors and the SST k-omega model illustrated the closest values to the data from the experiment, this is achieved by modifying the boundary condition for turbulent kinetic energy. Read More

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Research on heavy metal level and co-occurrence network in typical ecological fragile area.

J Environ Health Sci Eng 2021 Jun 8;19(1):531-540. Epub 2021 Mar 8.

Department of Environmental Science and Engineering, School of Earth and Environment, Anhui University of Science and Technology, 232001 Huainan, People's Republic of China.

Due to the special sensitivity of typical ecologically fragile areas, a series of human life, mining, and other activities have a greater impact on the environment. In this study, three coal mines in Ordos City on the Loess Plateau were selected as the study area, and the pollution levels of heavy metals in the area were studied by measuring As, Hg, Cr, Cd, Cu, Ni, and Pb in the soil of 131 sampling points. Combined with the concept of "co-occurrence network" in biology, the level of heavy metals in soil was studied using geostatistics and remote sensing databases. Read More

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Monitoring and prediction of dust concentration in an open-pit mine using a deep-learning algorithm.

J Environ Health Sci Eng 2021 Jun 3;19(1):401-414. Epub 2021 Feb 3.

School of Safety Engineering, North China Institute of Science and Technology, Sanhe, 065201 Hebei China.

Purpose: Dust pollution is currently one of the most serious environmental problems faced by open-pit mines. Compared with underground mining, open-pit mining has many dust sources, and a wide area of influence and complicated changes in meteorological conditions can result in great variations in dust concentration. Therefore, the prediction of dust concentrations in open-pit mines requires research and is of great significance for reducing environmental pollution and personal health hazards. Read More

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Assessment of incremental lifetime cancer risks of ambient air PM-bound PAHs in oil-rich cities of Iran.

J Environ Health Sci Eng 2021 Jun 12;19(1):319-330. Epub 2021 Jan 12.

Air Pollution and Respiratory Diseases Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

This study investigates the concentrations of PM-bound PAHs and their seasonal variations in three cities of Ahvaz, Abadan, and Asaluyeh in Iran. The mean concentrations of PM in two warm and cold seasons in Ahvaz were higher and in Abadan and Assaluyeh were lower than the national standard of Iran and the guidelines of the World Health Organization. The Σ16 PAHs concentration in ambient air PM during the cold season in Ahvaz, Abadan and Asaluyeh was 244. Read More

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3D N,O-Codoped Egg-Box-Like Carbons with Tuned Channels for High Areal Capacitance Supercapacitors.

Nanomicro Lett 2020 Apr 1;12(1):82. Epub 2020 Apr 1.

College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China.

Functional carbonaceous materials for supercapacitors (SCs) without using acid for post-treatment remain a substantial challenge. In this paper, we present a less harmful strategy for preparing three-dimensional (3D) N,O-codoped egg-box-like carbons (EBCs). The as-prepared EBCs with opened pores provide plentiful channels for ion fast transport, ensure the effective contact of EBCs electrodes and electrolytes, and enhance the electron conduction. Read More

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Reversed ethane/ethylene adsorption in a metal-organic framework introduction of oxygen.

Chin J Chem Eng 2020 Feb;28(2)

Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249-0698, United States.

Separation of ethane from ethylene is a very important but challenging process in the petrochemical industry. Finding an alternative method would reduce the energy needed to make 170 million tons of ethylene manufactured worldwide each year. Adsorptive separation using CH-selective porous materials to directly produce high-purity CH is more energy-efficient. Read More

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February 2020

The impact of organic extracts of seasonal PM on primary human lung epithelial cells and their chemical characterization.

Environ Sci Pollut Res Int 2021 Jun 20. Epub 2021 Jun 20.

Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Hospital, 101 Daehakno, Jongno-gu, Seoul, 03080, Korea.

Lung epithelial cells serve as the first line of defense against various inhaled pollutant particles. To investigate the adverse health effects of organic components of fine particulate matter (PM) collected in Seoul, South Korea, we selected 12 PM samples from May 2016 to January 2017 and evaluated the effects of organic compounds of PM on inflammation, cellular aging, and macroautophagy in human lung epithelial cells isolated directly from healthy donors. Organic extracts of PM specifically induced neutrophilic chemokine and interleukin-8 expression via extracellular signal-regulated kinase activation. Read More

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The effect of ultrasound on bulk and surface nanobubbles: A review of the current status.

Ultrason Sonochem 2021 Jun 12;76:105629. Epub 2021 Jun 12.

Department of Basic Sciences, Deanship of Preparatory Year and Supporting Studies, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia; Basic & Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia. Electronic address:

The generation, and stability of nanobubbles are of particular interest for fundamental research and have potential application in numerous fields. Several attempts were made in the literature to produce nanobubbles through acoustic cavitation. However, the generation and stability mechanisms of nanobubbles in the acoustic field are unclear. Read More

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Study on the correlation between Fe/Ti forms and reaction activity in high-alumina coal fly ash.

Sci Total Environ 2021 Jun 10;792:148419. Epub 2021 Jun 10.

College of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, Hubei Province, China.

High-alumina coal fly ash (HAFA) is an important aluminum and silicon resource. In the process of preparing aluminum-silicon materials from HAFA, the influence of impurity elements on its performance must be considered. In this work, the occurrence state of impurities in HAFA, micro morphology, and the bond energy of different impurity coordination were studied. Read More

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Constructing Co-N-C Catalyst via a Double Crosslinking Hydrogel Strategy for Enhanced Oxygen Reduction Catalysis in Fuel Cells.

Small 2021 Jun 17:e2100735. Epub 2021 Jun 17.

State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.

Exploiting platinum-group-metal (PGM)-free electrocatalysts with remarkable activity and stability toward oxygen reduction reaction (ORR) is of significant importance to the large-scale commercialization of proton exchange membrane fuel cells (PEMFCs). Here, a high-performance and anti-Fenton reaction cobalt-nitrogen-carbon (Co-N-C) catalyst is reported via employing double crosslinking (DC) hydrogel strategy, which consists of the chemical crosslinking between acrylic acid (AA) and acrylamide (AM) copolymerization and metal coordinated crosslinking between Co and P(AA-AM) copolymer. The resultant DC hydrogel can benefit the Co dispersion via chelated Co-N/O bonds and relieve metal agglomeration during the subsequent pyrolysis, resulting in the atomically dispersed Co-Nx/C active sites. Read More

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Methanogenic archaea use a bacteria-like methyltransferase system to demethoxylate aromatic compounds.

ISME J 2021 Jun 18. Epub 2021 Jun 18.

Department of Microbiology, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands.

Methane-generating archaea drive the final step in anaerobic organic compound mineralization and dictate the carbon flow of Earth's diverse anoxic ecosystems in the absence of inorganic electron acceptors. Although such Archaea were presumed to be restricted to life on simple compounds like hydrogen (H), acetate or methanol, an archaeon, Methermicoccus shengliensis, was recently found to convert methoxylated aromatic compounds to methane. Methoxylated aromatic compounds are important components of lignin and coal, and are present in most subsurface sediments. Read More

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Access to enantioenriched compounds bearing challenging tetrasubstituted stereocenters via kinetic resolution of auxiliary adjacent alcohols.

Nat Commun 2021 06 18;12(1):3735. Epub 2021 Jun 18.

State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, China.

Contemporary asymmetric catalysis faces huge challenges when prochiral substrates bear electronically and sterically unbiased substituents and when substrates show low reactivities. One of the inherent limitations of chiral catalysts and ligands is their incapability in recognizing prochiral substrates bearing similar groups. This has rendered many enantiopure substances bearing several similar substituents inaccessible. Read More

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Prediction of spontaneous coal combustion tendency using the Multinomial Logistic Regression.

Int J Occup Saf Ergon 2021 Jun 18:1-23. Epub 2021 Jun 18.

Department of Maritime Business Administration, Bandirma Onyedi Eylul University, Bandirma, Turkey.

Spontaneous combustion of coal is a complex underground mining disaster, which mainly threats mine safety and efficiency. Several factors usually cause spontaneous combustion of coal such as gas concentration, ventilation, coal properties. In this study, spontaneous combustion tendencies of the coal mines were predicted considering the effective parameters for an underground coal mine in Turkey. Read More

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