Enhanced activity and stability of La-doped CeO2 monolithic catalysts for lean-oxygen methane combustion

Document Type

Journal Article

Publication Date

2018

Keywords

Methane combustion, Ce1-xLaxO2-δ, Solid solution, Deoxygenation, Coal bed methane, CeO2

DOI

10.1007%2Fs11356-017-0934-x

Abstract

Effective utilization of coal bed methane is very significant for energy utilization and environment protection. Catalytic combustion of methane is a promising way to eliminate trace amounts of oxygen in the coal bed methane and the key to this technology is the development of high-efficiency catalysts. Herein, we report a series of Ce1-xLaxO2-δ (x = 0–0.8) monolithic catalysts for the catalytic combustion of methane, which are prepared by citric acid method. The structural characterization shows that the substitution of La enhance the oxygen vacancy concentration and reducibility of the supports and promote the migration of the surface oxygen, as a result improve the catalytic activity of CeO2. M-Ce0.8La0.2O2-δ (monolithic catalyst, Ce0.8La0.2O2-δ coated on cordierite honeycomb) exhibits outstanding activity for methane combustion, and the temperature for 10 and 90% methane conversion are 495 and 580 °C, respectively. Additionally, Ce0.8La0.2O2-δ monolithic catalyst presents excellent stability at high temperature. These Ce1-xLaxO2-δ monolithic materials with a small amount of La incorporation therefore show promises as highly efficient solid solution catalysts for lean-oxygen methane combustion.

Source Publication

Environmental Science and Pollution Research

Volume Number

25

Issue Number

6

ISSN

1614-7499

First Page

5643

Last Page

5654

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