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High Catalytic Activity of Crystalline Lithium Calcium Silicate for Oxidative Coupling of Methane Originated from Crystallographic Joint Effects of Multiple Cations
Author(s) -
Matsumoto Tomohiro,
Saito Miwa,
Ishikawa Satoshi,
Fujii Kotaro,
Yashima Masatomo,
Ueda Wataru,
Motohashi Teruki
Publication year - 2020
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.201902241
Subject(s) - oxidative coupling of methane , catalysis , methane , lithium (medication) , chemistry , selectivity , inorganic chemistry , phase (matter) , oxide , silicate , materials science , chemical engineering , organic chemistry , medicine , endocrinology , engineering
The oxidative coupling of methane (OCM) to C 2 hydrocarbons is one of the most attractive catalytic processes towards the effective utilization of methane. Despite a great deal of effort in past research, the primary activation factor for OCM has still been unclear because of the chemical and structural complexities of known catalysts such as Mn−Na 2 WO 4 /SiO 2 . Here, we report a high catalytic activity of a crystalline oxide Li 2 CaSiO 4 for OCM. The C 2 selectivity and CH 4 conversion reach 77.5 % and 28.3 %, respectively, at 750 °C, which are comparable to or even higher than those with Mn−Na 2 WO 4 /SiO 2 . The simplicity of active sites in our single‐phase Li 2 CaSiO 4 catalyst facilitates a deeper understanding of the reaction mechanism, which leads to a crystallographic design concept for highly active OCM catalysts containing multiple cations.