Attapulgite clay supported Ni nanoparticles encapsulated by porous silica: Thermally stable catalysts for ammonia decomposition to COx free hydrogen

被引：59

作者：

Li, Lei ^{[1
]}

Chen, Feng ^{[2
]}

Shao, Jingling ^{[1
]}

Dai, Yong ^{[1
]}

Ding, Jianfei ^{[1
]}

Tang, Zhe ^{[1
]}

机构：

[1] Yancheng Inst Technol, Sch Chem & Chem Engn, Yancheng 224051, Peoples R China

[2] Suzhou Univ Sci & Technol, Sch Chem Biol & Mat Engn, Suzhou 215009, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2016年 / 41卷 / 46期

基金：

中国国家自然科学基金;

关键词：

Core-shell; Nickel catalyst; Attapulgite; Silica; Ammonia decomposition; PARTIAL OXIDATION; CARBON NANOFIBERS; NH3; DECOMPOSITION; SURFACE-AREA; FUEL-CELL; GENERATION; METHANE; PERFORMANCE; REDUCTION; SIZE;

D O I：

10.1016/j.ijhydene.2016.08.156

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：

Porous silica encapsulated attapulgite (ATP) clay supported nickel catalysts were prepared by successive precipitation-deposition method, which were tested in an ammonia decomposition for production of COx-free hydrogen. The textural and structure properties of Ni/ATP catalysts and silica encapsulated Ni/ATP catalysts were characterized by X-ray diffraction, scanning and transmission electron microscopy, N-2 sorption, thermogravimetry-differential thermal analysis, hydrogen temperature-programmed reduction. The results reveal that ATP supported Ni catalysts possess a suitable specific surface area and pore volume, as well as nano-structure. Ni nanoparticles are mostly located on the external surface of ATP supports. With an increase on Ni loading content from 10 to 50 wt % (theoretical value), the ammonia conversion increases gradually. Owning to porous silica enwrapping, the Ni-30/ATP@SiO2 catalysts show a higher specific activity (17.0 mol g(Ni)(-1) h(-1), 650 degrees C) and stability than Ni-30/ATP catalysts. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：21157 / 21165

页数：9

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