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用元素分析、热脱附和H_2还原脱附等方法分析了Pd/γ-Al_2O_3、Pd/MgO、Pd/TiO_2溶剂化金属原子浸渍(SMAI)催化剂的表面组成和孔结构。结果表明Pd颗粒表面覆盖着一些有机碎片,这些碎片主要由C_1和少量C_2,C_3及C_3以上物种组成。SMAI催化剂的比表面积均高于相应纯载体的比表面积。而平均孔径均小于后者,CO_2甲烷化反应中,SMAI催化剂的活性均高于相应的普通浸渍法(CI)催化剂,而活化能却低于后者。在SMAI催化剂上CO_2甲烷化反应机理与Solymosi机理相同。
The surface composition and pore structure of Pd / γ-Al 2 O 3, Pd / MgO and Pd / TiO 2 solvated metal atom impregnated (SMAI) catalysts were analyzed by elemental analysis, thermal desorption and desorption by H_2 reduction. The results show that the surface of Pd particles is covered with some organic fragments. These fragments mainly consist of C_1 and a few C_2, C_3 and C_3 above species. The specific surface area of SMAI catalyst is higher than the specific surface area of the corresponding pure carrier. While the average pore size is smaller than the latter. In the CO 2 methanation reaction, the activity of SMAI catalyst is higher than the corresponding ordinary impregnation (CI) catalyst, but the activation energy is lower than the latter. The CO 2 methanation reaction mechanism on the SMAI catalyst is the same as the Solymosi mechanism.