H2-TPR Study on Mo/HZSM-5 Catalyst for CH4 Dehydroaromatization

Temperature-programmed reduction (TPR) of hydrogen was used to investigate the reducibility of Mo species on Mo/HZSM-5 catalysts prepared by different methods, and the six possible H2-consumption peaks were assigned precisely with the help of 1H MAS NMR. The TPR peaks corresponding to the reduction of Mo species associated with Brønsted acid sites were first identified. In addition, the catalytic performance of various Mo-based catalysts was studied for methane dehydroaromatization. The Mo species that is located in the channels of HZSM-5 zeolite and associated with Brønsted acid sites is more active and stable for the formation of one-ring aromatics in the methane dehydroaromatization.