Cu-Mn-Si催化剂在环己醇脱氢和糠醛加氢耦合反应中的研究：沉淀pH值和焙烧温度的影响  

Study on Cu-Mn-Si catalysts for the coupling process of cyclohexanol dehydrogenation and furfural hydrogenation:Effect of pH value and calcination temperature

作　　者：郑洪岩[1,2] 朱玉雷[1] 黄龙[1,2] 相宏伟[1] 李永旺[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100039

出　　处：《燃料化学学报》2008年第5期631-636,共6页Journal of Fuel Chemistry and Technology

基　　金：中国科学院其他任务(国家奖创新匹配经费)(06YCC21FT1)

摘　　要：采用共沉淀法制备了Cu—Mn—si催化剂，并将其应用于常压气相环己醇脱氢和糠醛加氢耦合反应中，考察了沉淀pH值和焙烧温度对耦合反应的影响。沉淀pH值对糠醛加氢制2－甲基呋喃反应影响不大，但对环己酮的选择性影响较大。pH值在7．5—10．0制备的催化剂具有优良的反应性能。焙烧温度的提高，导致催化剂的比表面积减小，孔径变大，铜的比表面积下降，还原温度提高。在耦合一体化反应中，环己醇脱氢制备环己酮反应受焙烧温度影响不大，但糠醛转化率和2-甲基呋喃选择性随着焙烧温度的提高而减小。The coupling process of the cyclohexanol dehydrogenation and the furfural hydrogenation on precipitated Cu-Mn-Si catalysts was carried out at atmospheric pressure in gas phase. The effects of pH value and calcination temperature on the performance of catalysts were studied in detail. There was no observable difference in furfural hydrogenation reaction over the catalysts precipitated at different values of pH. However, pH value had significant influence on the selectivity of cyclohexanone. The catalysts precipitated at the pH values range of 7.5 to 10.0 showed good performance for the coupling process. The increase of calcination temperature decreased the surface area and copper surface area and increased the average pore size, leading to a difficult reduction of the active phase. The calcination temperature had no significant effect on the cyclohexanol dehydrogenation to cyclohexanone, whereas the conversion of furfural and the selectivity of 2-methylfuran declined with the increase of calcination temperature.

关 键 词：Cu—Mn—Si 环己醇 糠醛 PH值 焙烧温度 

分 类 号：O643.38[理学—物理化学]