纳米载体铜基催化剂对低碳醇合成的影响

本文用沉积-沉淀法制备了新型纳米载体低碳醇合成催化剂，并与共沉淀法所制备的催化剂进行了对比，结果表明，纳米载体催化剂活性高、耐热性能好、醇收率高纳米载体对纳米载体催化剂活性大小的影响顺序为：纳米Al2O3＞纳米ZnO-ZnAl2O4＞纳米MgAl2O4＞纳米MgO.工艺参数对反应性能的影响结果表明，反应温度低，甲醇选择性高；但温度太高（＞320℃）CO2。选择性升高，且整个反应为动力学控制；压力升高可提高活性和C1-C2OH选择性，但C4OH选择性下降；结合空速对产物分布的影响，反应可能按Smith和Anderson的缩聚机理进行．

EFFECT OF Cu-BASE CATALYST ON NANOSIZE-SUPPORT ON SYNTHESIS OF LOW-CARBON ALCOHOLS

A series of novel nanosize-support catalysts for the synthesis of low-carbon alcohols were prepared by means of multi-component deposition-precipitation method. For the purpose of comparison of catalytic performance, catalysts were prepared by coprecipitation.The comparative tests showed that catalysts possessed high activity and thermostability as well as high yield of alcohols. The activity of catalysts on various nanosize-support decreases in the following order: nano-Al2O3> nano-ZnO-ZnAl2O4> nano-MgAl2O4> nano-MgO. The process parameters are found to affect significantly the catalytic behaviour. Low reaction temperature is beneficial for methanol, but favorable to the selectivity of CO2 under high reaction temperature. The overall process was controlled by reaction kinetices. High pressure can enhance the activities and selectivities to C1OH and C2OH alcohols, but leads to lower selectivity to C4OH alcohols. In view that product distribution changes with the space velocity, the alcohol systhesisproceeds most likely according to the model proposed by Smith and Anderson.