Shape selectivity of MWW-type aluminosilicate zeolites in the alkylation of toluene with methanol
Shape selectivity of MWW-type aluminosilicate zeolites in the alkylation of toluene with methanol
复制标题
DOI：
10.1016/j.apcata.2006.10.036
复制
发表时间：
2007-02-20
影响因子：
5.5
通讯作者：
Matsukata, Masahiko
中科院分区：
文献类型：
--
作者：
Inagaki, Satoshi;Kamino, Kohei;Matsukata, Masahiko
我们研究了甲苯与甲醇在 250 摄氏度下在具有 MWW 结构的 MCM-22 和 ITQ-2 沸石上的烷基化反应。虽然通过 MCM-22 前体分层生产的 ITQ-2 在甲苯转化率水平 1.7% 时显示出 23% 的对二甲苯选择性，但通过用可力丁毒化 ITQ-2 的外表面，获得了在甲苯转化率水平 0.6% 时 80% 的高对二甲苯选择性。类似地，用可力丁处理的MCM-22显示出74%的高对二甲苯选择性，甲苯转化率水平为3.8%。我们得出的结论是，MWW结构中的层间和层内十元环（10MR）微孔导致甲苯与甲醇的烷基化过程中对二甲苯的形状选择性形成。 (c) 2006 Elsevier B.V. 保留所有权利。
We investigated the alkylation of toluene with methanol at 250 degrees C over MCM-22 and ITQ-2 zeolites possessing an MWW structure. Whereas ITQ-2, produced by the delamination of MCM-22 precursor, showed a poor p-xylene selectivity of 23% at 1.7% of the level of toluene conversion, a high p-xylene selectivity of 80% at 0.6% of the level of toluene conversion was obtained by poisoning the external surface of ITQ-2 with collidine. Similarly, MCM-22 treated with collidine showed a high p-xylene selectivity of 74% at 3.8% of the level of toluene conversion. We concluded that both interlayer and intralayer 10-membered ring (10MR) micropores in the MWW structure caused the shape-selective formation of p-xylene in the alkylation of toluene with methanol. (c) 2006 Elsevier B.V. All rights reserved.