Effects of ultrasonic impregnation combined with calcination in N2 atmosphere on the property of Co3O4/CeO2 composites for catalytic methane combustion

• Published in: Journal of energy chemistry Vol. 25; no. 3; pp. 387 - 392
• Main Authors: Lu, Hong, Jiang, Chengfa, Ding, Zhenwu, Wang, Wei, Chu, Wei, Feng, Yanyan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2016
• Subjects: Catalytic combustion; Co3O4/CeO2; N2 calcination; Sol-gel method; Ultrasonic; Catalytic combustion; Sol-gel method; Ultrasonic; N2 calcination; Co3O4/CeO2
• ISSN: 2095-4956
• DOI: 10.1016/j.jechem.2016.01.012

Co3O4/CeO2 composites with high surface areas and ultrafine crystalline sizes for catalytic combustion of methane were firstly prepared by a new sol-gel method which combined ultrasonic impregnation treatment and calcination in N2 atmosphere. The samples were characterized by various means such as nitrogen adsorption/desorption, X-ray diffraction（XRD）, H2 temperature-programmed reduction（H2-TPR）,X-ray photoelectron spectroscopy（XPS） and transmission electron microscopy（TEM）. Results showed that the modified catalyst had the mesoporous structure, comparatively higher amount of surface oxygen and larger oxygen vacancies than others. As a result of the structure and surface composition merits, a high methane combustion conversion（50%） could be obtained at a low temperature of 262 °C for the modified Co3O4/CeO2 composites catalysts. The experimental results demonstrated that ultrasonic impregnation treatment combined with the N2 thermal treatment prior to calcination in air had a promising application for preparation of Co3O4/CeO2 composites catalysts for low-temperature catalytic combustion of methane.