A comparative study of zeolites SSZ-33 and MCM-68 for hydrocarbon trap applications
A comparative study of zeolites SSZ-33 and MCM-68 for hydrocarbon trap applications
复制标题
DOI：
10.1016/j.micromeso.2006.06.038
复制
发表时间：
2006-11-26
影响因子：
5.2
通讯作者：
Okubo, Tatsuya
中科院分区：
文献类型：
--
作者：
Elangovan, S. P.;Ogura, Masaru;Okubo, Tatsuya
沸石 SSZ-33 和 MCM-68 均具有 12 元环孔和 10 元环孔，已使用甲苯程序升温解吸 (TPD) 作为模型系统，对用作碳氢化合物捕集器进行了评估。 SSZ-33具有12 x 12 x 10的孔隙结构，Si/Al比为20，而MCM-68具有12 x 10 x 10的孔隙结构，可以在Si/Al比为9的情况下合成。与MCM-68相比，SSZ-33上吸附的甲苯总量更大，而后者在更高的温度下解吸甲苯。金属交换即。 SSZ-33和MCM-68上的Ag+、Ag+-CO2+和Ag+-Mn2+不会导致甲苯解吸量的增加。水热老化确实导致 H-MCM-68 上甲苯吸附的显着损失，可能是由于脱铝，而高硅沸石 H-SSZ-33 的吸附能力降低程度较小。 (c) 2006 Elsevier Inc. 保留所有权利。
Zeolites SSZ-33 and MCM-68, both possessing 12- and 10-membered ring pores, have been evaluated for use as a hydrocarbon trap employing temperature-programmed desorption (TPD) of toluene as a model system. SSZ-33 possesses a 12 x 12 x 10 pore system with a Si/Al ratio of 20, while MCM-68 has a 12 x 10 x 10 pore structure and can be synthesized with a Si/Al ratio of 9. The total amount of toluene adsorbed on SSZ-33 is greater as compared with MCM-68, while the later material desorbs toluene at somewhat higher temperature. Metals exchange viz. Ag+, Ag+-CO2+ and Ag+-Mn2+ on SSZ-33 and MCM-68 does not result in the increase of the amount of toluene desorbed. Hydrothermal aging does result in a significant loss of toluene adsorption on H-MCM-68 probably due to dealumination, while the adsorption capacity is reduced to a lesser extent for the high-silica zeolite H-SSZ-33. (c) 2006 Elsevier Inc. All rights reserved.