Publications by authors named "Natalia Czuma"

3 Publications

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SO sorption properties of fly ash zeolites.

Turk J Chem 2020 11;44(1):155-167. Epub 2020 Feb 11.

Department of Coal Chemistry and Environmental Sciences, Faculty of Energy and Fuels, AGH University of Science and Technology, Kraków Poland.

In the presented study, the sulfur dioxide sorption properties of fly ash zeolite X were investigated. Sorption tests were performed on fly ash zeolite samples that were not prepared specially for sorption, in addition to dried samples and samples in the presence of water vapor. The samples saturated with water vapor showed the highest sorption capacity. The sorption capacity of the samples additionally dried prior to the sorption experiment was higher than that of the samples that were not specially prepared for the sorption test. Regeneration tests indicated relatively good regeneration properties. The obtained results were described with the use of Langmuir, Sips, and Dubinin-Astakhov models, with the Dubinin-Astakhov model providing the best fit.
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http://dx.doi.org/10.3906/kim-1905-50DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7751809PMC
February 2020

CO sorption and regeneration properties of fly ash zeolites synthesized with the use of differentiated methods.

Sci Rep 2020 Feb 4;10(1):1825. Epub 2020 Feb 4.

AGH University of Science and Technology, Faculty of Energy and Fuels, al. A. Mickiewicza 30, 30-059, Kraków, Poland.

Production of fly ash zeolites may be an attractive method for the utilization of solid wastes from the energy sector. Different methods of synthesis often yield a variety of zeolite types, thereby affecting the properties of the resulting materials. The attention paid to carbon dioxide emission reduction technologies fully justifies the study of the sorption behaviours of fly ash zeolites synthesized by different methods. This work investigates the sorption properties of fly ash zeolites synthesized with different methods using CO. Sorption capacity and adsorption isotherms were determined following the volumetric method and textural parameters were resolved according to the Dubinin-Astakhov (DA) method. The CO sorption capacity was in the range 0.24-4.16 mmol/g. The relationships between structure and sorption behaviour were studied for each synthesis method. Some strong similarities between commercial zeolites and fly ash zeolites were found. The mechanism for sorption was proved to be physisorption which is fully reversible under selected conditions. The observed trends were used to identify the best sorbent.
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http://dx.doi.org/10.1038/s41598-020-58591-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7000786PMC
February 2020

CO2 adsorption properties of char produced from brown coal impregnated with alcohol amine solutions.

Environ Monit Assess 2016 Jul 17;188(7):416. Epub 2016 Jun 17.

Faculty of Energy and Fuels, AGH University of Science and Technology, Aleja Mickiewicza 30, 30-059, Cracow, Poland.

Carbon dioxide (CO2) emission reduction is critical to mitigating climate change. Power plants for heating and industry are significant sources of CO2 emissions. There is a need for identifying and developing new, efficient methods to reduce CO2 emissions. One of the methods used is flue gas purification by CO2 capture through adsorption. This study aimed to develop CO2 adsorbent out of modified brown coal impregnated with solutions of first-, second-, and third-order amines. Low-temperature nitrogen adsorption isotherms and CO2 isotherms were measured for the prepared samples. The results of experiments unexpectedly revealed that CO2 sorption capacity decreased after impregnation. Due to lack of strait trends in CO2 sorption capacity decrease, the results were closely analyzed to find the reason for the inconsistencies. It was revealed that different amines represent different affinities for CO2 and that the size and structure of impregnating factor has influence on the CO2 sorption capacity of impregnated material. The character of a support was also noticeable as well for impregnation results as for the affinity to CO2. The influence of amine concentration used was investigated along with the comparison on how the theoretical percentage of the impregnation on the support influenced the results. The reaction mechanism of tertiary amine was taken into consideration in connection to no presence of water vapor during the experiments. Key findings were described in the work and provide a strong basis for further studies on CO2 adsorption on amine-impregnated support.
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http://dx.doi.org/10.1007/s10661-016-5423-zDOI Listing
July 2016
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