Application of zinc ferrite, a regenerable mixed metal oxide, for the removal of H2S from hot coal derived gas streams is limited to a maximum temperature of about 1,250°F (677°C) and to a minimum H2S concentration of about 5 ppmv in the cleaned gas. Four novel sorbents that have shown potential for overcoming the limitations of zinc ferrite [1, 4] were selected for development and bench‐scale testing. Several variations of these mixed metal oxides were prepared, using different amounts of binders. They were tested in the presence of simulated coal gas using a thermogravimetric reactor (TGR) for selection of preparations possessing an adequate combination of reactivity, regenerability, capacity, and strength. Limited bench‐scale tests were conducted in the presence of simulated fluidized‐bed coal gasifier product gases at pressures from 1 to 2 MPa, temperatures from 525°C to 625°C and space velocities from 1,000 to 3000 Nm3/(m3 · h).
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Gangwal et al. (1989) studied this question.