US EPA

1510076 

Journal Article 

Development of novel copper-based sorbents for hot-gas cleanup. Technical report, 1 March--31 May 1994 

Abbasian, J; Hill, AH; Flytzani-Stephanopoulos, M; Li, Z 

1994 

06 

23 

Progress rept. red by Department of Energy, Washington, DC. jective of this investigation is to evaluate two novel copper-based sorbents, namely copper-chromium and copper-cerium, for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650 to 850 C. Such high temperatures will be required for the new generation of gas turbines (inlet > 750 C) in Integrated Gasification Combined Cycle (IGCC) systems. Results of fixed-bed reactor tests conducted in this quarter, indicate that, at 750 C, pre-reduction with H(sub 2) in the presence of H(sub 2)O does not effect the performance of either sorbent for H(sub 2)S removal. For the pre-reduced CuCr(sub 2)O(sub 4) sorbent, copper utilization before the first H(sub 2)S breakthrough is substantially higher in synthesis feed gas mixture than in feed gas containing 30 Vol% H(sub 2), and slightly lower than in 10 vol% H(sub 2). In sulfidation-regeneration testing of copper- and additive-rich sorbents, chromium-rich CuO-3Cr(sub 2)O(sub 4) sorbent demonstrated very high H(sub 2)S removal efficiency and high copper conversion levels (comparable to that of the 1:1 molar composition sorbent). Similar results were obtained with the cerium-rich CuO-3CeO(sub 2) sorbent, but only for the first cycle. The H(sub 2)S removal performance of both copper-rich sorbents was inferior to that of the respective 1:1 molar compositions. CuO-CeO(sub 2) sorbent testing in a TGA indicates no appreciable decrease in the sulfidation rate over 5 1/2 cycles. However, weight changes during regeneration of the CuO-CeO(sub 2) suggest that some copper or cerium sulfates formed. 

Cerium Oxides; Chromium Oxides; Copper Oxides; Fuel Gas; Hot Gas Cleanup; Desulfurization; Adsorbents; Combined-Cycle Power Plants; Experimental Data; Hydrogen Sulfides; Performance Testing; Progress Report; Sorptive Properties; Tables(data); Air pollution abatement; EDB/010402