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负载型Cu/SiO_2或Mn/SiO_2催化剂对CO加氢合成甲醇反应的催化活性甚低,而Cu-Mn~(2+)/SiO_2催化剂的催化活性却很高,研究表明,Mn~(2+)的加入使催化剂表面的分散度增大,并可能通过Cu-Mn~(2+)间的有关轨道相互作用或通过Cu、Mn与载体间的氧桥间接发生作用,使催化剂吸附氢和异裂氢的能力增大,为HCOO~-后续加氢提供充足的氢原,从而提高Cu-Mn~(2+)/SiO_2催化剂CO加氢合成甲醇的催化活性。
The catalytic activity of supported Cu / SiO_2 or Mn / SiO_2 catalysts for methanol synthesis by CO hydrogenation is very low, while the catalytic activity of Cu-Mn ~ (2 +) / SiO_2 catalysts is very high. ) Increases the dispersion of the catalyst surface, and may be caused by the orbital interaction between Cu-Mn ~ (2+) or indirectly through the oxygen bridge between Cu and Mn and the support, so that the catalyst can adsorb hydrogen and hetero Hydrogen cracking ability increases, providing sufficient hydrogen for HCOO ~ - subsequent hydrogenation, thereby enhancing the catalytic activity of Cu-Mn ~ (2 +) / SiO_2 catalyst for CO hydrogenation of methanol.