考察了Ru-Re/SiO2 组分催化剂的酸性质,并探讨了Re组分在丙三醇氢解制丙二醇反应中对提高该催化剂性能所起的作用.本文采用氨气程序升温脱附法和吸附吡啶原位红外光谱法表征了双组分Ru.Re/SiO2和单组分Ru/SiO2、Re/SiO2催化剂的酸性质,并比较了催化剂在丙三醇氢解反应中的催化性能.结果显示,Ru-Re/SiO2、Ru/SiO2和Re/SiO2催化剂表面均有酸性位,但Ru-Re/SiO2和Re/SiO2催化剂的酸量明显高于Ru/SiO2催化剂.本文对不同Re含量的Ru-Re/SiO2催化剂的催化性能也进行了考察.Ru-Re/SiO2催化剂的活性随催化剂表面的酸量增加而增大,且催化剂表面的酸量与催化剂上铼氧化物的含量直接相关.讨论了铼氧化物在Ru-Re/SiO2催化剂催化的丙三醇氢解反应过程中所起的作用.
The acidic property of Ru-Re/SiO2 catalysts and the role of Re were investigated. The acidic properties of Ru-Re/SiO2, Ru/SiO2, and Re/SiO2 were characterized by temperature programmed desorption of ammonia and in situ IR spectra of pyridine adsorption. Their catalytic performances in glycerol hydrogenolysis were compared. Ru-Re/SiCh, Ru/SiO2, and Re/SiO2 possessed acid sites, but the site amounts of Ru-Re/SiO2 and Re/SiO2 were much higher than that of Ru/SiO2. The activities of Ru-Re/SiO2 with different Re contents were evaluated. The activity of Ru-Re/SiO2 increased with the acid amount, which correlated with the amount of Re oxide on the catalyst. The role of Re oxide in Ru-Re/SiO2 catalyzed glycerol hydrogenolysis was discussed.
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