Simultaneous removal of H{sub 2}S and NH{sub 3} in coal gasification processes. Quarterly report, 1996

Abstract

The objective of this study is to develop advanced high-temperature coal gas desulhrization mixed-metal oxide sorbents with stable ammonia decomposition materials at 550-800" C (1022-1472" ' F). The specific objectives of the project are to: (i) Develop a conibined sorbent-catalyst materials sliall be capable of removing hydrogen sulfide to less than 20 ppniv and ammonia by at least 90 percent. (ii) Carry out coinparative fixed-bed studies of absorption and regeneration with various formulations of sorbent-catalyst systems and select most promising sofbent-catalyst type. (iii) Conduct long-term (at least 30 cycles) clurability and chemical reactivity in the fixed-bed with the superior sorbent-catalyst. BACKGROUND INFORMATION Nitrogen (NJ occurs in coal in the form of tightly bound organic ring compounds, typically at levels of 1 to 2 wt% on a dry-ash-free basis. Diiring, coal gasification, this fuel