Control of acid-site location of ZSM-5 zeolite membrane and its application to the MTO reaction
Control of acid-site location of ZSM-5 zeolite membrane and its application to the MTO reaction
复制标题
DOI：
10.1016/j.cattod.2005.06.009
复制
发表时间：
2005-08
期刊：
影响因子：
5.3
通讯作者：
T. Tago;Kazuyuki Iwakai;Kenshi Morita;Katsunori Tanaka;T. Masuda
中科院分区：
文献类型：
--
作者：
T. Tago;Kazuyuki Iwakai;Kenshi Morita;Katsunori Tanaka;T. Masuda
ZSM-5沸石膜在甲醇转化中对烯烃表现出高选择性，是通过控制酸位点的位置而开发的。首先，通过在圆柱形氧化铝陶瓷过滤器的外表面上合成ZSM-5沸石层，成功制备了无针孔的ZSM-5沸石催化剂膜。该膜用作催化膜反应器从甲醇中回收烯烃。尽管以高选择性（约 80%）成功地从甲醇生产了烯烃，但在沸石膜的进料侧观察到石蜡和芳烃的产生。为了防止这种情况的发生，通过一种称为硅烷催化裂化（CCS）法的新方法来控制ZSM-5沸石膜的酸性位点的位置。通过 CCS 方法选择性失活沸石膜外表面（反应物的进料侧）的酸性位点，使我们与未处理的膜相比，能够将烯烃的选择性提高 10%。
ZSM-5 zeolite membrane, which shows high selectivity toward olefins in the methanol conversion, was developed by controlling the location of the acid sites. First, the ZSM-5 zeolite catalyst membrane without pinholes was successfully prepared by synthesizing a ZSM-5 zeolite layer on an outer surface of a cylindrical alumina ceramic filter. The membrane was used as the catalytic membrane reactor to recover olefins from methanol. Though the olefins were successfully produced from methanol with high selectivity (ca. 80%), production of paraffin and aromatics was observed at the feed side of the zeolite membrane. To prevent the such production, the location of the acid site of the ZSM-5 zeolite membrane was controlled by a new method called the catalytic cracking of silane (CCS) method. Selective deactivation of acid sites at the outer surface of the zeolite membrane (feed side of reactant) by the CCS method allowed us to increase the selectivity of the olefins by 10% as compared to the untreated membrane.