Preparation of CoB/ZIF-8 supported catalyst by single step reduction and its activity in hydrogen production

被引：83

作者：

Li, Qiming ^{[1
,2
]}

Yang, Wei ^{[1
]}

Li, Fang ^{[1
]}

Cui, Ailing ^{[1
]}

Hong, Jie ^{[1
]}

机构：

[1] Liaoning Shihua Univ, Coll Chem Chem Engn & Environm Engn, Fushun 113001, Peoples R China

[2] Chinese Acad Sci, Key Lab Coal Ethylene Glycol & Its Related Techno, Fuzhou 350002, Fujian, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2018年 / 43卷 / 01期

基金：

中国国家自然科学基金;

关键词：

CoB/ZIF-8; Co/Zn-ZIF-8; Chemical reduction; Hydrolysis; Supported catalyst; SODIUM-BOROHYDRIDE; NANOWIRE ARRAY; NABH4; SOLUTION; TI MESH; GENERATION; HYDROLYSIS; EFFICIENT; COMPOSITE; ZIF-67; REGENERATION;

D O I：

10.1016/j.ijhydene.2017.11.105

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

CoB/ZIF-8 supported catalysts were successfully prepared using Co/Zn-ZIF-8 as the precursor by single-step reduction, which was applied in hydrogen release from the hydrolysis of NaBH4. Reducible Co ions of Co/Zn-ZIF-8 can be partially in-situ transformed into CoB by direct reduction, whereas ZIF-8 framework structure can be well preserved due to the resistance of Zn to reducing ambiences. Accordingly, CoB active components can be highly loaded onto ZIF-8 support to produce CoB/ZIF-8 catalysts. The texture evolution of Co/ZnZIF-8 during reduction was investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscope and nitrogen adsorption desorption isotherms. Compared with the reduction of Co-ZIF-67, the framework structure of Co/Zn-ZIF-8 can be effectively preserved although Co ions of Co/Zn-ZIF-8 were partially reduced into cobalt-based alloy. In the hydrogen release from hydrolysis of NaBH4, CoB/ZIF-8 supported catalyst exhibits excellent catalytic activity. The effect of NaOH concentration, NaBH4 concentration and reaction temperature on hydrolysis reaction of NaBH4 was deeply studied based on this catalyst. Compared with other published catalysts, this catalyst exhibits relatively low activation energy of about 57.72 kJ morl. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：271 / 282

页数：12

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