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In Situ Incorporation of Zn into Hierarchical ZSM-5 Zeolites for Olefin Hydroisomerization
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-06-09 , DOI: 10.1021/acs.iecr.0c01506 Tao Pan 1 , Zhijie Wu 1 , Kuanyu Zhou 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-06-09 , DOI: 10.1021/acs.iecr.0c01506 Tao Pan 1 , Zhijie Wu 1 , Kuanyu Zhou 1
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Zn species were incorporated into hierarchical ZSM-5 zeolite (Zn-ZSM-5) via in situ hydrothermal crystallization of aluminosilicate gel containing zinc metal salts. Compared to bulk ZSM-5 zeolite, incorporating 2.3 wt % Zn increased the zeolite particle size from 1–2 to 3–5 μm and changed the morphology of the zeolite crystal from cube to cuboid. The acid density of zeolite also decreased from 1.12 to 0.37 mmol/g, as well as the ratio of the Brønsted acid site to the Lewis acid site (B/L) decreased from 1.2 to 0.3. However, the proportion of medium-strong acid sites was increased from 5.4 to 35.1%. Compared with Zn-modified ZSM-5 zeolite (Zn/ZSM-5) prepared by impregnation, Zn-ZSM-5 is characteristic of homogeneous dispersed ZnOH+ species with a higher proportion of medium-strong acid sites (35.1 versus 15.5%) and a lower ratio of B/L (0.3 versus 0.6). For 1-hexene hydroisomerization, Zn-ZSM-5 zeolite possessed a higher selectivity of iso-alkanes than that of Zn/ZSM-5 zeolite (51.4 versus 42.4%), as well as the selectivity of aromatics (2.3 versus 1.4%), suggesting potential application in the reduction of the olefin content in FCC gasoline.
中文翻译：
Zn原位掺入ZSM-5分子筛中进行烯烃加氢异构化
通过含有锌金属盐的铝硅酸盐凝胶的原位水热结晶，将锌物质掺入分级ZSM-5沸石（Zn-ZSM-5）中。与块状ZSM-5沸石相比，掺入2.3 wt％的Zn可使沸石的粒径从1-2μm增大到3-5μm，并将沸石晶体的形态从立方体变为长方体。沸石的酸密度也从1.12降至0.37 mmol / g，布朗斯台德酸位点与路易斯酸位点的比值（B / L）从1.2降至0.3。但是，中等强酸位点的比例从5.4增加到35.1％。与通过浸渍制备的Zn改性ZSM-5沸石（Zn / ZSM-5）相比，Zn-ZSM-5具有均匀分散的ZnOH +物种具有较高比例的中强酸位点（35.1对15.5％）和较低的B / L比（0.3对0.6）。对于1-己烯加氢异构化，Zn-ZSM-5沸石具有比Zn / ZSM-5沸石更高的异链烷烃选择性（51.4对42.4％），以及芳香族化合物的选择性（2.3对1.4％），提示在降低FCC汽油中烯烃含量方面的潜在应用。
更新日期：2020-07-08
中文翻译：
Zn原位掺入ZSM-5分子筛中进行烯烃加氢异构化
通过含有锌金属盐的铝硅酸盐凝胶的原位水热结晶，将锌物质掺入分级ZSM-5沸石（Zn-ZSM-5）中。与块状ZSM-5沸石相比，掺入2.3 wt％的Zn可使沸石的粒径从1-2μm增大到3-5μm，并将沸石晶体的形态从立方体变为长方体。沸石的酸密度也从1.12降至0.37 mmol / g，布朗斯台德酸位点与路易斯酸位点的比值（B / L）从1.2降至0.3。但是，中等强酸位点的比例从5.4增加到35.1％。与通过浸渍制备的Zn改性ZSM-5沸石（Zn / ZSM-5）相比，Zn-ZSM-5具有均匀分散的ZnOH +物种具有较高比例的中强酸位点（35.1对15.5％）和较低的B / L比（0.3对0.6）。对于1-己烯加氢异构化，Zn-ZSM-5沸石具有比Zn / ZSM-5沸石更高的异链烷烃选择性（51.4对42.4％），以及芳香族化合物的选择性（2.3对1.4％），提示在降低FCC汽油中烯烃含量方面的潜在应用。
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