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The declining crude oil reserves has led to natural gas being considered as an alternative supply to produce important organic raw materials such as ethene and aromatics. Mo/HZSM-5 is found to be able to act effectively for the title reaction[1]. In order to clarify how the cation in the channel of HZSM-5 effects the behavior of the catalyst, different rare earth ion exchanged HZSM-5 ([ RE3+] HZSM-5 ) zeolites were investigated as supports of the Mo/[ RE3 + ] HZSM-5 catalyst.