Perovskites are good candidates as a catalyst support to enhance the catalytic performance of Ni catalysts in steam methane reforming for hydrogen production. To obtain a Ni/perovskite catalyst with a high activity and stability, different LaBO3(B = Al, Fe, Mn), La0.7A0.3AlO3−δ(A = Ca, Ba, Ce, Zn, Sr, Mg) and La1−xMgxAlO3−δperovskites were prepared and their role in supporting Ni catalysts was comprehensively investigated in the current work. Catalyst characterization methods, including XRD, H2-TPR, H2-TPD, XPS, TG and Raman spectroscopy, were also used to understand the underlying mechanisms. The results show that the doping of Ca, Ba, Ce and Zn in the A site of the perovskite lowers the catalytic activity, while the partial substitution of Mg and Sr could improve the activity of Ni/LaAlO3. More importantly, it is suggested that the Ni/La0.7Mg0.3AlO3−δcatalyst has an outstanding catalytic activity and resistance to carbon deposition, and there is some carbon deposited after a stability test lasting for 35 h. The excellent catalytic performance is determined to be due to the higher dispersion of active Ni, the greater the amount of surface oxygen, the stronger the interaction between the active metal and support due to the partial doping of Mg.
Bibliographical noteFunding Information:
This work was supported by the National Natural Science Foundation of China (No. 52076020 and 51976019), Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (No. 2021-K12), and Fundamental Research Funds for the Central Universities (No. 2020CDJQY-A050 and 2020CDJ-LHZZ-049).
© The Royal Society of Chemistry 2021.
Copyright 2021 Elsevier B.V., All rights reserved.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology