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本文应用脉冲色谱微型反应器研究了CO,C_2H_4,C_2H_2和C_6H_6在稀土金属间化合物LaNi_5上的催化加氢作用,并且在同一装置上与纯Ni进行了对比。实验结果表明: (1)LaNi_5的催化活性与被加氢物质的性质有关。与纯Ni相比,LaNi_5对被加氢物质所显示的催化效率按下面次序变小: CO>C_2H_4>C_2H_2>C_6H_6,但对苯而言,LaNi_5的活性却比纯Ni低。 (2)在H_2中经升温处理过的LaNi_5比未经升温处理的LaNi_5具有更大的催化活性。 (3)CO甲烷化反应在LaNi_5及纯Ni上均遵从一级反应速度规律,其活化能分别为15.5Kcal/mole和31Kcal/mole。
In this paper, the catalytic hydrogenation of CO, C_2H_4, C_2H_2 and C_6H_6 on rare earth intermetallic compound LaNi_5 was studied by pulse-chromatogram microreactor and compared with pure Ni on the same equipment. The experimental results show that: (1) The catalytic activity of LaNi_5 is related to the nature of the hydrogenated material. Compared with pure Ni, the catalytic efficiency of LaNi_5 to the hydrogenated material becomes smaller in the following order: CO> C_2H_4> C_2H_2> C_6H_6, but for benzene, the activity of LaNi_5 is lower than pure Ni. (2) LaNi_5, which has been warmed in H_2, has more catalytic activity than LaNi_5, which has not been warmed. (3) CO methanation reaction follows the first-order reaction rate law on LaNi_5 and pure Ni, and its activation energy is 15.5Kcal / mole and 31Kcal / mole, respectively.