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Catalytic Methane Decomposition to Hydrogen over a Surface‐Protected Core‐Shell Ni@SiO 2 Catalyst
Author(s) -
Wu Shan-Luo,
Yang Ren-Xuan,
Wey Ming-Yen
Publication year - 2018
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201700315
Subject(s) - catalysis , methane , tetraethyl orthosilicate , decomposition , hydrogen , mesoporous silica , chemical engineering , inorganic chemistry , mesoporous material , hydrogen production , chemistry , bromide , materials science , nanotechnology , organic chemistry , engineering
Abstract Methane decomposition is a promising method to obtain CO x ‐free hydrogen. The main difficulty of this process is that the produced carbon would deposit on the active phase of the catalyst, leading to catalyst deactivation. In this study, a core‐shell‐structured composite catalyst comprising highly active Ni nanoparticles (NP) as core and mesoporous silica as shell is introduced. The silica shells were synthesized by using cetyltrimethylammonium bromide as template and tetraethyl orthosilicate as precursor. Ni NP and Ni@SiO 2 were examined as catalysts for hydrogen production by methane decomposition at different temperatures and gas hourly space velocities. The results show that the core‐shell catalyst exhibited much better stability in methane decomposition than Ni NP without silica shell and a traditional supported catalyst.