Solid-state NMR studies of methanol-to-aromatics reaction over silver exchanged HZSM-5 zeolite
Solid-state NMR studies of methanol-to-aromatics reaction over silver exchanged HZSM-5 zeolite
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DOI：
10.1016/j.micromeso.2006.09.012
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发表时间：
2007-01
影响因子：
5.2
通讯作者：
D. Zeng;Jun Yang;Jiqing Wang;Jun Xu;Yongxia Yang;C. Ye;F. Deng
中科院分区：
文献类型：
--
作者：
D. Zeng;Jun Yang;Jiqing Wang;Jun Xu;Yongxia Yang;C. Ye;F. Deng
使用固态核磁共振波谱研究了银交换 HZSM-5 沸石上甲醇向芳烃 (MTA) 的转化。在 MTA 反应中起关键作用的是氧化银而不是银阳离子。芳香族产物（主要是甲苯和苯）是以小烷烃（主要是丙烷和异丁烷）为代价而形成的。与在真空中煅烧的AgZSM-5沸石或HZSM-5沸石相比，在空气中煅烧的AgZSM-5沸石对于MTA转化表现出更高的活性和选择性。提出了 AgZSM-5 沸石上 MTA 转化的可能反应机制。
Solid-state NMR spectroscopy was used to study the conversion of methanol to aromatics (MTA) over silver exchanged HZSM-5 zeolites. It is the silver oxide rather than silver cation that plays a crucial role for the MTA reaction. The aromatic products (mainly toluene and benzene) are formed at the expense of the small alkanes (mainly propane and isobutane). AgZSM-5 zeolite calcined in air shows much higher activity and selectivity for the MTA conversion compared with AgZSM-5 zeolite calcined in vacuum or HZSM-5 zeolite. A possible reaction mechanism is proposed for the MTA conversion on the AgZSM-5 zeolite.