Simultaneous removal of H{sub 2}S and NH{sub 3} in coal gasification processes. Quarterly progress report, April 1--June 30, 1995
The objective of this study is to develop advanced high-temperature coal gas desulfurization mixed-metal oxide sorbents with stable ammonia decomposition materials at 550--800 C. The specific objectives of the project are to: (1) develop combined sorbent-catalyst materials which shall be capable of removing hydrogen sulfide to less than 20 ppmv and ammonia by at least 90%; (2) carry out comparative fixed-bed studies of absorption and regeneration with various formulations of sorbent-catalyst systems and select the most promising sorbent-catalyst type; and (3) conduct long-term (at least 30 cycles) durability and chemical reactivity in the fixed-bed with the superior sorbent-catalyst. The activities of the HART 42 and HART 41 sorbent-catalysts were tested using the simulated coal gas. Figures show the H{sub 2}S removal ability, its ammonia decomposition activity, and the H{sub 2}S breakthrough profiles as a function of time. The pre-breakthrough H{sub 2}S level was below 100 ppm. Nearly complete sorbent conversion (100%) was observed at breakthrough. The HART 42 sorbent-catalysts showed moderate catalytic activity (50% average conversion) for ammonia decomposition. The average conversion decreased from 66 to 47% as the temperature was increased from 600 to 750 C for HART 41 sorbent-catalysts.
- Research Organization:
- Hampton Univ., VA (United States). Dept. of Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-93MT93005
- OSTI ID:
- 119864
- Report Number(s):
- DOE/MT/93005--T3; ON: DE96000957
- Country of Publication:
- United States
- Language:
- English
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