Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 202, Issue -, Pages 683-694Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.09.071
Keywords
Hexagonal lanthanum dioxycarbonate; Dry reforming of methane; Ni catalysts; Anti-sintering; Nanorod-shaped metal oxide
Funding
- National Key Research and Development Program of China [2016YFB0600900]
- National Science Foundation of China [21525626, 21222604, 21376169]
- Program for New Century Excellent Talents in University [NCET-10-0611]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars (MoE)
- Program of Introducing Talents of Discipline to Universities [B06006]
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This paper describes the design of a Ni/La2O3 catalyst using La2O2CO3 nanorod as a support precursor (denoted as Ni/La2O3-LOC) via a wet impregnation method for dry reforming of methane (DRM). The results showed that La2O3 derived from the La2O2CO3 precursor maintained its initial morphology upon thermal treatment and could highly disperse Ni particles on it. Additionally, the nanorod-shaped support could provide more medium-strength basic sites to facilitate CO2 adsorption and activation on its surface. Consequently, the Ni/La2O3-LOC catalyst reached 70% of CH4 conversion and 75% of CO2 conversion at 700 degrees C after 50 h DRM reaction with a H-2/CO ratio of 0.87. The enhanced metal-support interaction restricted the sintering of nickel particles under harsh reaction conditions. Coke evolution on the catalysts was also investigated to understand coke formation mechanism and the role of La2O2CO3 in coke elimination. It has been found that nickel dispersion can affect distribution of coke and La2O2CO3 on the surface of catalyst, both of which have a close relation with catalytic performance. (C) 2016 Elsevier B.V. All rights reserved.
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