Comparison of the activities of binder-added and binder-free Mo/HZSM-5 catalysts in methane dehydroaromatization at 1073 K in periodic CH_4-H_2 switch operation mode

作     者：Yuebing Xu Hongtao Ma Yo Yamamoto Yoshizo Suzuki Zhanguo Zhang 

作者机构：National Institute of Advanced Industrial Science and Technology (AIST) 16-10nogawa Tsukuba 305-8569 Japan Meidensha Co. Osaki 2-8-1 Shinagawa-ku Tokyo141-8565 Japan 

出 版 物：《Journal of Natural Gas Chemistry》 (天然气化学杂志（英文版）)

年 卷 期：2012年第21卷第6期

页      面：729-744页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 082903[工学-林产化学加工工程] 07[理学] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0829[工学-林业工程] 070303[理学-有机化学] 0703[理学-化学] 

主　　题：methane dehydroaromatization Mo/HZSM-5 binder coke formation 

摘      要：Three industry-supplied, well-shaped Mo/HZSM-5 catalysts, two binder-added and one binder-free, were tested for the first time in methane dehydroaromatization to benzene at 1073 K and 10000 mL/（g·h） in periodic CH4-H2 switch operation mode, and their catalytic performances were compared with those of three self-prepared, binder-free powder Mo/HZSM-5 catalysts. XRD, 27Al NMR, SEM, BET and NH3-TPD characterizations of all the catalysts show that the zeolites in the two binder-added catalysts are comparable to those in the three binder-free powder catalysts in crystallinity, crystal size, micropore volume and Br{／o}nsted acidity. The test results, on the other hand, show that the catalytic performances of the two binder-added catalysts are worse than those of the four binder-free catalysts on both catalyst mass and zeolite mass bases. Then, TPO and BET measurements of all spent samples were conducted to get a deep insight into the negative effects of binder addition, and the results suggest that the binder additives functioned mainly to enhance the polyaromatization of formed aromatics to coke on their external surfaces and consequently lower the catalysts＇ benzene formation activity and selectivity.