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Mesoporous Ni(OH) 2 /CeNi x O y Composites Derived Ni/CeNi x O y Catalysts for Dry Reforming of Methane
Author(s) -
Dou Jian,
Bao Zhenghong,
Yu Fei
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201701073
Subject(s) - materials science , catalysis , mesoporous material , nickel , hydrothermal circulation , nanoparticle , chemical engineering , nanotechnology , metallurgy , chemistry , organic chemistry , engineering
Designing stable nickel‐based catalysts is critical for dry reforming of methane with carbon dioxide (DRM) to produce fuels and chemicals. Herein, mesoporous Ni(OH) 2 /CeNi x O y composites were prepared by a one‐pot hydrothermal synthetic route. Aggregation of Ni(OH) 2 nanoplates and CeNi x O y nanocrystals generates mesopores from the void space and creates a surface area as high as 138 m 2 g −1 . With the Ni content in the range of 0.7–12.5 %, the mesoporous structure is stable after reduction with the highest surface area as 94 m 2 g −1 . Reduction of Ni(OH) 2 /CeNi x O y composites at 500 °C converts Ni(OH) 2 nanoplates into Ni nanoparticles. The size of the reduced Ni nanoparticles was controlled from 10 to 140 nm by adjusting the Ni loading from 0.7 to 42.7 %. The catalysts with Ni/(Ni+Ce) ratios of 0.4 and 0.5, 0.4 Ni/CeNi x O y and 0.5 Ni/CeNi x O y , respectively, exhibit enhanced catalytic performance for DRM reaction with their activities 3–5 times as high as those of 0.6 Ni/CeNi x O y and 0.8 Ni/CeNi x O y catalysts, owing to the good dispersion of 10 nm Ni nanoparticles within mesoporous CeNi x O y . Furthermore, the 0.5 Ni/CeNi x O y catalyst is very stable for DRM for 140 h. The robust stability of 0.5 Ni/CeNi x O y catalyst possibly stems from the strong interactions between Ni nanoparticles and the CeNi x O y surface, which stabilize Ni nanoparticles during DRM reaction.