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Indexed by:期刊论文

Date of Publication:2018-02-01

Journal:Environmental science and pollution research international

Included Journals:SCIE、PubMed

Volume:25

Issue:6

Page Number:5643-5654

ISSN No.:1614-7499

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

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-delta (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-delta (monolithic catalyst, Ce0.8La0.2O2-delta 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-delta monolithic catalyst presents excellent stability at high temperature. These Ce1-xLaxO2-delta monolithic materials with a small amount of La incorporation therefore show promises as highly efficient solid solution catalysts for lean-oxygen methane combustion. Graphical abstract ᅟ.