Mechanistic and Kinetic Studies of High-Temperature Coal Gas Desulfurization Sorbents: Quarterly Technical Progress Report, January-March 1989.

摘要

Bulk Zn-Ti-O binary oxides and ZnO were synthesized in macroporous and dispersed form by the amorphous citrate technique. The addition of TiO sub 2 into ZnO stabilized ZnO against reduction to volatile elemental zinc at 650/degree/C in a simulated coal gas mixture of 1%H sub 2 S-13%H sub 2 -19%H sub 2 O-67%N sub 2 . The intrinsic sulfidation kinetics of zinc titanates were similar to zinc oxide at 650/degree/C. Cyclic sulfidation-regeneration experiments were performed in a packed-bed microreactor. The H sub 2 S removal efficiency of Zn-Ti-O materials was as high as that of ZnO removing H sub 2 S to less than 1-5 ppm until breakthrough. Although zinc titanates typically has low sulfidation conversion (50-60%), this problem could be eliminated by preparing the sorbents from a chloride-precursor. 16 refs., 10 figs., 3 tabs. (ERA citation 14:027827)