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Demonstrating the Potential of Chemiluminescence as a Tool to Characterize Heterogeneous Catalysis Using CO Oxidation on Copper‐Based Catalysts as an Example
Author(s) -
Kato Satoru,
Ito Yoshihiko,
Ikuta Yasuhiro,
Morikawa Akira,
Suda Akihiko,
Tanabe Toshitaka
Publication year - 2019
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.201900264
Subject(s) - catalysis , copper , chemiluminescence , reaction mechanism , chemistry , redox , heterogeneous catalysis , inorganic chemistry , photochemistry , organic chemistry
In this paper, the potential of chemiluminescence (CL) as a tool to determine reaction mechanisms of heterogeneous catalyst is demonstrated. Since CL is emitted from excited species produced in chemical reactions, the analysis of CL is expected to be informative for investigating reaction mechanisms. As a representative example, CL under CO oxidation over copper‐based catalysts was measured. The reaction mechanism of copper‐based catalysts reportedly depends on the support material. CL was observed with CuO/Al 2 O 3 and CuO/SiO 2 −Al 2 O 3 but was not detected with CuO, CuO/TiO 2 and CuO/SiO 2 . Transient CL emitting analysis for CuO/Al 2 O 3 revealed that CL was emitted via an Eley‐Rideal (ER) mechanism. Although the CO oxidation mechanism over CuO/SiO 2 −Al 2 O 3 has not been reported, CO oxidation via an ER mechanism was suggested based on the similarities of the CL spectra of CuO/SiO 2 −Al 2 O 3 and CuO/Al 2 O 3 . This suggests the potential of CL as a tool to investigate reaction mechanisms of heterogeneous catalysts.