Enhancing the effect of CoAl2O4 on the simultaneous removal of H2S and NH3 on Co- and Mo- based catal-sorbents in IGCC
Abstract Co-Mo-based catal-sorbents were prepared on various supports, such as Al 2 O 3 (CMA), SiO 2 (CMS), and ZrO 2 (CMZ), by an impregnation method, and were tested for the simultaneous removal of H 2 S and NH 3 gases in a fixed bed reactor. Similar sulfur removal capacities were obtained for all the catal-sorbents in the presence of NH 3 gas at 650°C. However, only CMA catal-sorbent had an excellent NH 3 decomposition ability during the H 2 S absorption. All of the catal-sorbents formed CoMoO 4 , which was the main active site for H 2 S absorption. In particular, CoAl 2 O 4 was only observed in the CMA catal-sorbent, and it was reduced by NH 3 at low temperatures, a phenomenon that improved the NH 3 decomposition ability of the catal-sorbent during the H 2 S absorption process. To improve the simultaneous removal ability of Co-Mo-based catal-sorbents for H 2 S and NH 3 , aluminum-promoted Co-Mo-Al-based catal-sorbents (CMAS and CMAZ) were prepared by a new-impregnation method and examined. The NH 3 decomposition ability of the CMAS and CMAZ catal-sorbents increased during multiple cycles compared to that of the CMS and CMZ catal-sorbents. Furthermore, the simultaneous removal efficiencies of CMAS, and CMAZ for NH 3 and H 2 S were maintained over multiple cycles. Highlights Co-Mo-based catal-sorbents such as CMA, CMS and CMZ formed CoMoO 4 , which was the main active site for H 2 S absorption. However, only CMA had an excellent NH 3 decomposition ability during the H 2 S absorption. CoAl 2 O 4 was only observed in the CMA catal-sorbent, and it was reduced by NH 3 at low temperatures, a phenomenon that improved the NH 3 decomposition ability. CoAl 2 O 4 -promoted catal-sorbents (CMAS and CMAZ) had excellent simultaneous removal efficiency of H 2 S and NH 3 , due to synergistic effects of CoMoO 4 and CoAl 2 O 4 .
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