16.低品位鉄鉱石を用いる燃料ガス中のアンモニアの分解除去

抄録

Catalytic decomposition of NH_3 in fuel gas components with a low-valued iron ore (limonite) has been studied with a cylindrical quartz reactor mainly under the conditions of 0.1MPa, 750℃ and 45000 1/h. Metallic Fe formed from α-FeOOH present inherently in the limonite promotes the decomposition of 2000 ppm NH_3 in the coexistence of a high concentration of syngas (50%CO/25%H_2) with 3%H_2O added, and conversion of NH_3 to N_2 reaches 96% at 850℃. 10%Mg added to the limonite can suppress carbon deposition from the CO, and the Mg-added catalyst achieves the almost complete decomposition of NH_3 in 50%CO/25%H_2/5%CO_2/3%H_2O to N_2 at 750℃.