催化作用
二氧化碳重整
材料科学
镍
化学工程
纳米颗粒
介孔材料
焦炭
粒度
吸附
纳米技术
合成气
冶金
化学
有机化学
物理化学
工程类
作者
Qiong Huang,Xiuzhong Fang,Qinzhen Cheng,Qian Li,Xianglan Xu,Luoji Xu,Wenming Liu,Zhixian Gao,Wufeng Zhou,Xiang Wang
出处
期刊:Chemcatchem
[Wiley]
日期:2017-05-10
卷期号:9 (18): 3563-3571
被引量:41
标识
DOI:10.1002/cctc.201700490
摘要
Abstract A 12 % Ni@Al 2 O 3 catalyst was synthesized by using an inverse microemulsion technique and evaluated for the dry reforming of methane (DRM). We used TEM to reveal that the core–shell structure was formed successfully in the 12 % Ni@Al 2 O 3 catalyst, in which the Ni nanoparticle cores with an average grain size around 10 nm are encapsulated by mesoporous Al 2 O 3 shells. In comparison with a 12 % Ni/Al 2 O 3 catalyst prepared by an impregnation method, much smaller Ni grain sizes and higher metallic Ni active surface areas can be achieved in the core–shell catalyst, which was evidenced by using TEM and H 2 adsorption–desorption analysis. In addition, a larger amount of active oxygen species was formed on the surface of 12 % Ni@Al 2 O 3 than on 12 % Ni/Al 2 O 3 . Importantly, the formation of the core–shell structure in 12 % Ni@Al 2 O 3 can effectively impede the migration of the Ni active species at elevated temperatures, which prevents agglomeration. Consequently, the 12 % Ni@Al 2 O 3 core–shell catalyst shows a remarkable activity and stability and a potent coke resistance during a 50 h durability evaluation at 800 °C for DRM. It is believed that the core–shell structure is the major factor that accounts for the superior DRM performance over that of the 12 % Ni@Al 2 O 3 catalyst, which might open a new way for the design and development of improved catalysts for DRM for hydrogen production.
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