Preparation of N-doped Mo/HZSM-5 catalyst and its effect on performance of non-oxidative methane aromatization reaction

Catalysts for methane dehydroaromatization (MDA) were prepared using melamine as nitrogen source, doped with modified HZSM-5 zeolites and loaded with active metal component Mo. Using XPS, N₂-isothermal adsorption and desorption, XRD, H₂-TPR, TEM and NH₃-TPD, properties of the catalyst and state of active metal components were analyzed. Its catalytic performance for MDA reaction was investigated. The results showed that HZSM-5 after modified with melamine not only formed a layer of carbon and nitrogen groups on surface of the zeolites, but also controlled the medium and strong acid sites of the zeolites in orderly. At the same time it induced better anchor of Mo metal components on surface of the catalyst. The Mo/HZSM-5-CN catalyst prepared by this method could effectively increase methane conversion rate and aromatic selectivity of the MDA reaction, slow down generation of carbon deposits, and exhibit better catalytic performance.