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CePMo 12 O 40 / TiO 2 catalysts for photocatalytic oxidation of methane to value‐added organic oxygenates
Author(s) -
Ming Liyan,
Wang Chunling,
Hu Yun Hang
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6629
Subject(s) - oxygenate , catalysis , chemistry , methane , photocatalysis , oxidizing agent , inorganic chemistry , yield (engineering) , photochemistry , organic chemistry , materials science , metallurgy
Summary Methane is the main component of natural gas. The effective activation of C‐H bond of methane to synthesize value‐added compounds under mild conditions is attractive. Compared to the most investigated noble metal catalysts (such as Au, Pd, and Rh), rare earth metal catalysts possess stronger oxidizing activity. Herein, we report the first synthesis of Ce cation‐based phosphomolybdic salt (CePMo 12 O 40 ) with a simple milling method. Furthermore, CePMo 12 O 40 ‐based TiO 2 catalyst (CePMo/TiO 2 ) exhibited excellent catalytic performance for selective conversion of methane, achieving high yield (5618.5 μmol/g cat ) of organic oxygenates (CH 3 OOH, HCOOH, and HCHO) using O 2 as an oxidant in water at 150°C under 1.5G sunlight irradiation for 2 hours. It was found that the yield of total produced organic oxygenates over CePMo/TiO 2 is 119% larger with 1.5G sunlight light irradiation than that without the light irradiation. In addition, the introduction of CePMo into TiO 2 increased its photocatalytic activity for organic oxygenates by 11%. The isotope‐labeling evaluation revealed that both H 2 O and O 2 participated the oxidation of methane into CH 3 OOH, HCOOH, and HCHO. This work provides the first example of rare earth POM‐based photocatalysts for conversion of methane into liquid oxygenates.