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.
出处
《石油化工》
EI
CAS
CSCD
北大核心
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
关键词
氢解
催化剂
氧化铜
氧化硅
氧化钡
还原性
ultrafine SiO2,CuO,hydrogenolysis
diameter all decrease with increasing
