论文部分内容阅读
TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was investigated. Compared with Ru/Al_2O_3 catalyst, the Ru/TiO_2–Al_2O_3catalytic system exhibited a much higher activity in CO_2 methanation reaction. The reaction rate over Ru/TiO_2–Al_2O_3 was 0.59 mol CO_2·(g Ru)1·h-1, 3.1 times higher than that on Ru/Al_2O_3[0.19 mol CO_2·(gRu)-1·h-1]. The effect of TiO_2 content and TiO_2–Al_2O_3calcination temperature on catalytic performance was addressed. The corresponding structures of each catalyst were characterized by means of H_2-TPR, XRD, and TEM. Results indicated that the averaged particle size of the Ru on TiO_2–Al_2O_3support is 2.8 nm, smaller than that on Al_2O_3 support of 4.3 nm. Therefore, we conclude that the improved activity over Ru/TiO_2–Al_2O_3catalyst is originated from the smaller particle size of ruthenium resulting from a strong interaction between Ru and the rutile-TiO_2 support, which hindered the aggregation of Ru nanoparticles.
TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru / TiO_2-Al_2O_3catalyst in CO_2 methanation was investigated. Compared with Ru / Al_2O_3 catalyst, the Ru / TiO_2- Al_2O_3catalytic system exhibited a much higher activity in CO_2 methanation reaction. The reaction rate over Ru / TiO_2-Al_2O_3 was 0.59 mol CO_2 · (g Ru) 1 · h-1, 3.1 times higher than that on Ru / Al_2O_3 [0.19 mol CO_2 · (gRu) -1 · h-1]. The effect of TiO 2 content and TiO 2 -Al 2 O 3 calcination temperature on catalytic performance was addressed. The corresponding structures of each catalyst were characterized by means of H 2 -TPR, XRD, and TEM. the averaged particle size of the Ru on TiO_2-Al_2O_3support is 2.8 nm, smaller than that on Al_2O_3 support of 4.3 nm. Thus, we conclude that the improved activity over Ru / TiO_2-Al_2O_3catalyst is originated from the smaller particle size of ru thenium resulting from a strong interaction between Ru and the rutile-TiO_2 support, which hindered the aggregation of Ru nanoparticles.