Ammonia Removal in Coal Gasification Processes by Adsorption on Zeolites: Final Report.

摘要

The objective of this research project was to evaluate NH(sub 3) removal from hot coal-derived gases by adsorption on zeolites. Zeolites, because of their properties as solid acids, can adsorb certain compounds by chemical bonding on the acids sites. Chemisorption is slower than physical adsorption but can take place at higher temperatures. Ammonia is one of the many compound known to chemisorb on zeolites. Studies were conducted in a 100-cc, fixed-bed, continuous-flow, catalytic reactor. A simulated coal gas containing 5000 ppM NH(sub 3)(0.5 vol%) was used. A gas chromatograph equipped with a photoionization detector was used to analyze for NH(sub 3) in the inlet and outlet gases. The study showed that NH(sub 3) will adsorb on zeolites at high temperatures. Hydrogen mordenite was the most effective zeolite for adsorbing NH(sub 3) at 550/degree/C and 10 atm. With a dry feed gas a H-mordenite zeolite removed over 95% of the NH(sub 3) from the gas until the NH sub 3 loading on the zeolite reached about 1 wt% at breakthrough. 15 refs., 10 figs., 8 tabs. (ERA citation 13:046240)