Synthesis of ZIF-8-coated Pt/SiO2 by vapor deposition for alkyne semi-hydrogenation

被引：0
|
作者：
Luo G. [1 ,2 ]
Zhang B. [1 ]
Yang X.-C. [1 ,2 ]
Wu H.-B. [1 ,2 ]
Meng F.-C. [1 ,2 ]
Zhai L.-M. [1 ,2 ]
Qin Y. [1 ,2 ]
机构：
[1] State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan
[2] Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing
来源：
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2021年 / 49卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Atomic layer deposition; Semi-hydrogenation; Vapor phase crystallization; ZIF-8; film;
D O I：
10.1016/S1872-5813(21)60075-0
中图分类号：
学科分类号：
摘要：
In this work, ZIF-8/Pt/SiO2 catalysts were prepared by combining atomic layer deposition (ALD) and vapor phase conversion methods. First, Pt metal nanoparticles were deposited on SiO2 nanowires by ALD. Then, ZnO was further deposited, also by ALD. Subsequently, the ZnO film was converted into ZIF-8 film by vapor phase crystallization to form a sandwich structure (ZIF-8/Pt/SiO2). The microstructures of the catalysts were characterized by XRD, TEM, BET, IC-MS, XPS, and CO-DRIFT. It was shown that the Pt particles were highly dispersed on the SiO2nanowires before and after coating with ZIF-8, and the ZIF-8 film was coated continuously on the entire catalyst with high conformity. The performance of the catalyst was studied by using the semi-hydrogenation of 1-heptyne as a probe reaction. The ZIF-8 film induces an electron density increase in the Pt component, leading to an increase of the olefin selectivity from 14% to 70% in the 1-heptyne hydrogenation reaction. A reduced thickness of the ZIF-8 film increases the catalytic activity but does not affect the selectivity of 1-heptylene. © 2021, Science Press. All right reserved.
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页码：1316 / 1325
页数：9
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