Abstract
Effect of alkaline earth metals on the decomposition of 2000 ppm NH_3 in a syngas-rich fiiel gas (50 % CO/25 % H_2/5 % CO_2/3 % H_2O) with an Australian a-FeOOH-rich limonite has been studied with a vertical, cylindrical flow-type quartz reactor under the conditions of 0.1 MPa, 750℃ and 45000 h^<-1>. Mg cations added to the limonite, at a low loading of 3 mass% Mg, suppress the deposition of carbon by the disproportionation of CO in the syngas apparently, and the Mg-added limonite catalyst achieves the almost complete decomposition of NH_3 in this atmosphere to N_2 and maintains the high performance for about 15 h. These observations suggest that the Mg-added limonite is a promising catalyst material for NH_3 decomposition.
