Partial oxidation of methane to syngas over mesoporous Co-Al2O3 catalysts

Abstract

Mesoporous Co-Al 2 O 3 catalysts were prepared by one-pot synthesis and, for the first time, used in the partial oxidation of methane to synthesis gas. Compared with the catalysts prepared by impregnation methods, the catalysts prepared by one-pot synthesis showed superior catalytic performance for this reaction. The results showed that mesoporous Co-Al 2 O 3 catalysts have high surface areas, large pore volumes, and an ordered hexagonal mesostructure. In the catalysts, Co species are highly dispersed, resulting in high dispersion of the metal after reduction. A confinement effect, provided by the mesopores, on metal nanoparticles could effectively enhance resistance to metal sintering. 采用一锅法制备了介孔 Co-Al 2 O 3 催化剂, 并首次用于甲烷部分氧化制合成气反应. 结果表明, 与普通浸渍法相比, 一锅法制备的 Co-Al 2 O 3 催化剂表现出更为优异的催化性能. 合成的介孔 Co-Al 2 O 3 催化剂具有大的比表面积和孔体积, 以及规整有序的六方介孔孔道, Co 物种高度分散, 从而导致还原后高的金属分散度, 而介孔孔道对金属纳米颗粒的约束作用可有效增强金属的抗烧结能力. A mesoporous Co-Al 2 O 3 catalyst, prepared using one-pot synthesis, showed an ordered hexagonal mesostructure, high dispersion of Co species, and excellent catalytic performance for partial oxidation of methane to synthesis gas.