CePMo12 O 40 /TiO 2 catalysts for photocatalytic oxidation of methane to value-added organic oxygenates

Document Type

Article

Publication Date

3-16-2021

Department

Department of Materials Science and Engineering

Abstract

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 O ) with a simple milling method. Furthermore, CePMo O -based TiO catalyst (CePMo/TiO ) exhibited excellent catalytic performance for selective conversion of methane, achieving high yield (5618.5 μmol/g ) of organic oxygenates (CH OOH, HCOOH, and HCHO) using O 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 is 119% larger with 1.5G sunlight light irradiation than that without the light irradiation. In addition, the introduction of CePMo into TiO increased its photocatalytic activity for organic oxygenates by 11%. The isotope-labeling evaluation revealed that both H O and O participated the oxidation of methane into CH OOH, HCOOH, and HCHO. This work provides the first example of rare earth POM-based photocatalysts for conversion of methane into liquid oxygenates.

Publication Title

International Journal of Energy Research

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