Effect of Reduction Temperature and Time on Catalytic Performance of 10Ni-6K/CeO2 Catalyst in Medium Temperature Shift Reaction

چکیده مقاله

In order to produce purified hydrogen, after natural gas steam reforming, the medium temperature shift (MTS) reaction was carried out using 10Ni-6K/CeO2 catalyst. Catalyst was prepared by simultanious impregnation of Ni and K on ceria support and characterized by XRD and TPR. Reactor tests were done with steam to carbon ratio of 3, GHSV of 12000 h-1 in temperature range of 320-380 °C. effect of reduction temperatures of 300, 400 and 450 °C and reduction times of 1 and 2 h were investigated on CO conversion and CH4 and CO2.selectivities. It was determined that 300 °C is a low temperature for complete reduction and at 450 °C catalyst is sintered and reduction temperature of 400 °C and reduction time of 1 h for nickel promoted by K over cerium oxide has the best catalytic performance (CO conversion of about 90 % with methane selectivity of about 3% at 360 °C).