Murge Premanath, Dinda Srikanta, Roy Sounak
Langmuir. 2019 Nov 19;35(46):14751-14760. doi: 10.1021/acs.langmuir.9b02259. Epub 2019 Nov 5.
In this work, zeolite-based sorbents were developed from gasified rice husk. CO capture capacity of the sorbents was examined at various temperatures and pressures employing a fixed-bed flow reactor and simulated flue gas. Various physicochemical properties such as thermal stability, pore size distribution, morphology, chemical composition, etc. of the in-house-developed materials were characterized in detail and were also compared with two commercially available zeolites. Tetra-ethylenepentamine was impregnated in the in-house-developed zeolite supports to investigate its suitability to improve the CO adsorption capacity. The effects of reactor pressure, temperature, Si/Al ratio, and amine loading on CO uptake capacity were examined. A declining trend in CO adsorption capacity was observed with the increase in adsorption temperature and amine loading. At 30 °C, zeolite-Y (designated as Z-Y-3, silica to alumina ratio of 2.25) sample exhibited maximum adsorption capacity, and the obtained values were around 114 and 190 mg CO/g sorbent under atmospheric and 5 bar pressure, respectively. It was also observed that the presence of alkali metal ions influenced the adsorption capacity of the zeolites. The study inferred that the adsorbent was efficient and promising for multiple adsorption-desorption cycles without much deterioration of the capture capacity.
在这项工作中，以气化稻壳为原料制备了沸石基吸附剂。采用固定床流动反应器和模拟烟气，在不同温度和压力下考察了吸附剂的CO捕集能力。详细表征了自制材料的各种物理化学性质，如热稳定性、孔径分布、形态、化学成分等，并与两种市售沸石进行了比较。将四乙烯五胺浸渍在自制的沸石载体中，以研究其对提高CO吸附容量的适用性。考察了反应器压力、温度、Si/Al比和胺负载量对CO吸附量的影响。随着吸附温度和胺负载量的增加，CO吸附容量呈下降趋势。在30℃时，沸石Y（代号为Z-Y-3，二氧化硅与氧化铝比为2.25）样品表现出最大吸附容量，在常压和5 bar压力下，得到的值分别约为114和190 mg CO/g吸附剂。还观察到碱金属离子的存在影响了沸石的吸附容量。该研究推断，该吸附剂对于多次吸附-解吸循环是高效且有前景的，其捕集能力不会有太大的下降。
