Issue 18, 2023

Bismuth phosphate nanoparticle catalyst for direct oxidation of methane into formaldehyde

Abstract

The direct oxidation of methane (CH4) to formaldehyde (HCHO) with molecular oxygen (O2) as the sole oxidant was studied over various bismuth-based catalysts (BiPO4, α-Bi2O3, β-Bi2O3) using a fixed-bed flow reactor. The catalytic activity of monoclinic BiPO4 nanoparticles (BiPO4-DEG) synthesized in a mixed solvent of diethylene glycol (DEG) and water for the direct oxidation of CH4 was the highest among the catalysts tested. In high temperature region, BiPO4-DEG was more selective for HCHO formation than FePO4 nanoparticles. Based on mechanistic studies including the catalyst effect, kinetics, pulse-reaction experiments, infrared (IR) spectroscopy, operando near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), and density functional theory (DFT) calculations, surface active oxygen species generated on BiPO4 possibly react with CH4 to give HCHO as the primary product. In contrast, the phosphate units of FePO4 nanoparticles react with CH4 followed by rapid reoxidation to FePO4.

Graphical abstract: Bismuth phosphate nanoparticle catalyst for direct oxidation of methane into formaldehyde

Supplementary files

Article information

Article type
Paper
Submitted
01 may 2023
Accepted
24 iyl 2023
First published
25 iyl 2023

Catal. Sci. Technol., 2023,13, 5180-5189

Author version available

Bismuth phosphate nanoparticle catalyst for direct oxidation of methane into formaldehyde

A. Matsuda, K. Obara, A. Ishikawa, M. Tsai, C. Wang, Y. Lin, M. Hara and K. Kamata, Catal. Sci. Technol., 2023, 13, 5180 DOI: 10.1039/D3CY00590A

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