US EPA

1510074 

Journal Article 

Development of novel copper-based sorbents for hot-gas cleanup. (Quarterly) technical report, December 1, 1993--February 28, 1994 

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

1994 

21 

17 

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(degree) to 850(degree). Such high temperatures will be required for the new generation of gas turbines (inlet >750(degree)C) in Integrated Gasification Combined Cycle (IGCC) systems. The effect of pre-reduction with H(sub 2), in the presence of H(sub 2)O on the performance of the sorbents in cyclic sulfidation/regeneration, was studied in a thermogravimetric analyzer (TGA) and in a fixed-bed reactor at 750(degree)C. The results of the TGA tests indicate that pre-reduction of the sorbents is very fast in either 10% or 30% H(sub 2). Without sorbent pre-reduction, sulfidation consists of two-stages, a reduction-dominating and a sulfidation-dominating stage. Sulfidation apparently takes place before reduction is complete. During regeneration some copper/cerium sulfates may have formed and Cu(sub 2)O may have formed in addition to CuO. The fixed-bed reactor tests show that at 750(degree)C: (1) prereducing the CuO-Cr(sub 2)O(sub 3) with H(sub 2) does not effect the reactivity of the sorbent towards H(sub 2)S at either the high or low H(sub 2) feed gas concentrations and (2) when 30% H(sub 2) was used during sulfidation of either sorbent, the first H(sub 2)S breakthrough occurs earlier than when 10% H(sub 2) was used. 

Adsorbents; Coal Gas; Desulfurization; Hot Gas Cleanup; Cerium Oxides; Chromium Oxides; Copper Oxides; Experimental Data; Hydrogen; Performance Testing; Progress Report; Reduction; Regeneration; Sulfidation; Thermal Gravimetric Analysis; Tables(data); Air pollution abatement; EDB/010402