Partial Oxidation of Methane to Syngas over Monolithic Ni/γ-Al2O3 Catalyst——Effects of Rare Earths and Other Basic Promoters
来源期刊：JOURNAL OF RARE EARTHS2006年第4期
论文作者：Gong Maochu Mei Dajiang Li Xuan Ma Di Chen Yaoqiang
Key words：promoter; partial oxidation of methane; syngas; monolithic; rare earths;
Abstract: 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 1×105 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+2 O2→CO2+H2O, is fully restrained and 100% H2 selectivity is achieved when Ce and La are used as promoters, respectively.
Gong Maochu1，Mei Dajiang1，Li Xuan1，Ma Di1，Chen Yaoqiang1
(1.College of Chemistry, Sichuan University, Chengdu 610064, China)
Abstract: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 1×105 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+2 O2→CO2+H2O, is fully restrained and 100% H2 selectivity is achieved when Ce and La are used as promoters, respectively.
Key words:promoter; partial oxidation of methane; syngas; monolithic; rare earths;
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