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论文类型：期刊论文

发表时间：2018-02-01

发表刊物：Environmental science and pollution research international

收录刊物：SCIE、PubMed

卷号：25

期号：6

页面范围：5643-5654

ISSN号：1614-7499

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

摘要：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.