34 Characterization of Fe and Ni catalysts supported on Canadian peat-derived activated carbons and their performance in the decomposition of ammonia gas for hot gas cleanup

抄録

Fe and Ni catalysts supported on a Canadian peat-derived, H_3PO_4-activated carbon are characterized by several methods, and their performance in NH3 decomposition is investigated with a fixed bed quartz reactor from a viewpoint of hot gas cleanup. The X-ray photoelectron spectroscopy (XPS) analysis of the fresh catalysts after calcination at 500℃ reveals the significant retention of P on their surfaces, whereas the X-ray diffraction (XRD) measurements show the absence of any diffraction lines of Fe species and the appearance of metallic Ni. Both catalysts remarkably promote the decomposition of 2000ppm NH_3 diluted with inert He at 750℃ and show high, stable NH_3 conversions to N_2 of 75-90%. Because Fe and Ni phosphides are detectable by the XRD after the reaction, these species might be catalytically active.