The dispersed SiO2 microspheres supported Ru catalyst with enhanced activity for ammonia decomposition

被引：33

作者：

Wang, Fang ^{[1
]}

Deng, Li-dan ^{[2
]}

Wu, Ze-wei ^{[1
]}

Ji, Kai ^{[1
]}

Chen, Qiao ^{[1
]}

Jiang, Xing-mao ^{[1
]}

机构：

[1] Wuhan Inst Technol, Sch Chem Engn & Pharm, Hubei Key Lab Novel React & Green Chem Technol, Key Lab Green Chem Proc,Minist Educ, Wuhan 430205, Peoples R China

[2] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 40期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Ammonia decomposition; Ruthenium; CO(2-)Free hydrogen; Cs promoter; K promoter; COX-FREE HYDROGEN; CARBON NANOTUBES; NANOPARTICLES; GENERATION; PERFORMANCE; OXIDATION;

D O I：

10.1016/j.ijhydene.2021.03.205

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：

Ru nanoparticles supported on SiO2 microspheres (Ru/SiO2-GUS) were prepared by the glucose-urea-metallic salt method and applied in the decomposition of ammonia. In the glucose-urea-metallic salt method, glucose as the carbon template plays a significant role in the formation of diffusion-beneficial structural properties of Ru/SiO2-GUS, and also induceds the modification of the electronic state of Ru. Ru/SiO2-GUS exhibited higher catalytic activity compared with the catalyst prepared with the impregnation method. The catalytic performance of Ru/SiO2-GUS was further enhanced with the addition of either K or Csddthe addition order and amount strongly affecting the catalytic performance. When the ratio of K/Cs to Ru is 2, the alkali metal (KOH/CsOH) solution is added in the homogeneous solution of glucose, urea, RuCl3 and the colloidal silica, the promotion effect of K/Cs is the strongest, particularly under lower reaction temperatures. However, the promotion effects of K and Cs are different as reveled by the combined results of H-2-TPR, XPS and NH3-TPSR. More NH3 can be absorbed on KeRu/SiO2-GUS and the electron density of Ru decreased. By contrast, more metallic Ru formed on Cs-Ru/SiO2-GUS, facilitating N-2 recombination. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：20815 / 20824

页数：10

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