Partial Oxidation of Methane to Syngas over Monolithic Ni/γ-Al2O3 Catalyst--Effects of Rare Earths and Other Basic Promoters

• Published in: Journal of rare earths Vol. 24; no. 4; pp. 451 - 455
• Main Author: 马迪 梅大江 李璇 龚茂初 陈耀强
• Format: Journal Article
• Language: English
• Published: College of Chemistry, Sichuan University, Chengdu 610064, China 01.08.2006
• Subjects: 单片电路; 煤气化; 部分氧化; syngas; partial oxidation of methane; monolithic; promoter; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(06)60142-7

A series of monolithic Ni/γ-Al2O3 catalysts with and without basic promoters （Na, Sr, La, Ce） were prepared. Partial oxidation of methane （POM） to syngas was carried out in a continuous-flow, fixed-bed reactor. The influences of reaction conditions, including temperature, CH4/O2 ratio and space velocity, on the performance of the catalyst were investigated. The results show that at a high space velocity of 1 ×10^5 h^-1, optimal CH4 conversion can be obtained. Effects of promoters such as Na, Sr, Ce, La were also investigated, and the catalyst samples were characterized by means of temperature-programmed reduction and XRD techniques. XRD suggests that the addition of promoters has no influence on the crystal structure of Ni/γ-Al2O3 catalyst. The results show that the addition of a small amount of promoters improves the reducibility and activity of the catalyst. The side reaction CH4 ＋ 2O2→CO2 ＋ H2O, is fully restrained and 100% H2 selectivity is achieved when Ce and La are used as promoters, respectively.