CuO-BaO/SiO_2催化剂的表面性质、还原性能及氢解反应性能  

Surface Properties and Activity of CuO - BaO/SiO2 Catalysts for Methyl Formate Hydrogenolysis

作　　者：杨儒[1] 刘瑛[1] 钟炳[1] 戴丽珍[1] 张池明[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

出　　处：《石油化工》1999年第7期435-440,共6页Petrochemical Technology

基　　金：国家自然科学基金;山西省青年科技研究基金

摘　　要：研究了在合成气或纯氢气气氛下ＣｕＯ－ＢａＯ／ＳｉＯ２催化剂甲酸甲酯氢解反应活性的变化，并对催化剂进行了ＴＰＲ、ＴＥＭ和ＢＥＴ表征。结果表明，合成气氢解反应活性和甲醇选择性明显低于纯氢氢解反应活性和甲醇选择性，反应温度高对提高催化剂活性有利，但同时也加速了副反应的进行。随着负载量的增加，其比表面积、孔容和孔径逐渐降低；铜载量＜２０％时，催化剂孔结构为单孔型孔道；铜载量＞２０％以后，其孔结构呈双孔型孔道。铜载量对ＣｕＯ－ＢａＯ／ＳｉＯ２催化剂的还原性能影响很大，随着铜载量的增加，还原温度升高；焙烧温度小于５００℃时，催化剂还原性能基本不发生变化，且易于还原；焙烧温度大于５００℃后。Under syngas or pure H2, methyl formate hydrogenolysis was carried out over ultrafine CuO-BaO/SiO2 catalysts with various copper content,which had been previously investigated by TEM,BET and TPR techniques.Hydrogenolysis results show that the activity and selectivity of methanol produced from synthesis gas are smaller than those from pure H2.With increasing reaction temperature,the activity of methanol synthesis increases gradually,with simultaneously speeding up of side reactions.The specific surface area,pore volume and pore copper content in catalysts.When copper content is lower than 20%,the catalysts exhibit pore size distribution of single peak.When copper content is higher than 20%,the catalysts exhibit pore size distribution of double peaks.The copper content of catalysts show much greater influence on the reduction behavior.Possible relationship between copper content and reduction temperature is discussed.

关 键 词：氢解 催化剂 氧化铜 氧化硅 氧化钡 还原性 

分 类 号：O643.36[理学—物理化学] O621.254[理学—化学]