Novel Sorbents for High Temperature Regenerative H2 S Removal. Topical Report, October 1983-July 1984

摘要

The overall objective of this project is to develop regenerable sorbents for fuel gas desulfurization at an operating temperature of 550 to 750 C. Two classes of sorbents are being investigated for removal of H2 S from about 1 vol % to sub-ppM levels. The main characteristics of these sorbents are rapid kinetics of absorption and good regenerability. The rapid absorption kinetics are realized by eliminating or minimizing the resistance associated with solid state diffusion. With these properties, the sorbents would be suitable for coal gasification/molten carbonate fuel cell (MCFC) applications, but could also be applied to combined cycle power generation and the purification of synthesis gas. Work in Phase I was divided into two major tasks. The first task was to synthesize and test sorbents consisting of supported melts of binary oxides, particularly ZnO-V2 O5 on high surface area supports. The second task involved the synthesis, characterization and testing of unsupported binary oxides such as ZnO-Fe 2 O3 in the form of porous solid compounds or solid solutions of relatively high surface area. In general, the results from Phase I of this project have demonstrated the importance of the physical properties of sorbents for improved stable performance, and have identified new materials with superior sorbent properties both at lower (538 C) and higher (700 C) operating temperatures. Among the several H sub 2 S sorbent systems that were tested, the novel copper and zinc ferrite materials from class B and the CuMoO4 -MoO3 /alumina from class A have shown the most promising performance. These will be studied in more detail during Phase II of this work. 16 refs., 17 figs., 8 tabs. (ERA citation 10:045944)