金属含量对Pt-Co/AC催化剂低温苯加氢性能的影响  

Effect of Metal Loadings on Pt-Co/AC Catalyst for Low Temperature Hydrogenation of Benzene

作　　者：郑仁垟[1] 鲁树亮[2] 朱月香[2] 

机构地区：[1]中国石化石油化工科学研究院,北京100083 [2]北京大学化学与分子工程学院分子动态与稳态结构国家重点实验室北京分子科学国家实验室,北京100871

出　　处：《石油学报（石油加工）》2014年第2期211-217,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(20773004);国家科技支撑计划项目(2012BAE05B03);国家重点基础研究发展规划"973"项目(2011CB808702;2012CB224802)资助

摘　　要：采用浸渍法制备了活性炭负载的Pt—Co双金属催化剂Pt—Co／AC。探讨了不同金属质量分数（Pt的质量分数0．1％～1．2％，Co的质量分数5．0％～40．0％）对Pt—Co／At催化剂在70℃时催化苯加氢反应活性的影响。采用差热一热重方法分析了浸渍后样品的热分解过程，采用Hz程序升温还原法考察催化剂的还原性能，采用c0脉冲化学吸附测定催化剂表面活性位点。结果表明，Pt—Co／AC催化剂的加氢活性和表面活性位点均随着Co质量分数的增加而呈现先增加后减少的趋势，当Co质量分数为20％时，催化剂的活性最高；Co质量分数从5％增至40％时，催化剂单位活性位点的活性相近。当Pt—Co／AC催化剂中Pt质量分数在0．3％～1．2％时，其催化加氢活性随着Pt质量分数减少仅略有下降，表明加入少量的Pt即可表现出双金属效应。Pt—Co／AC双金属催化剂在70℃，甚至室温（30℃）时均表现出优异的苯加氢催化活性。Activated carbon supported Pt-Co bimetallic catalysts（Pt-Co/AC） were synthesized by impregnation method. The influence of metal contents on the catalytic activity of Pt-Co/AC for benzene hydrogenation was evaluated at 70℃. The investigated metal mass fraction ranges were 0.1%--1.2% for Pt and 5.0%--40.0% for Co in Pt-Co/AC catalyst. Differential thermal analysis- thermogravimetry （DTA-TG）, H2-temperature programmed reduction （Hz-TPR） and pulse CO chemisorption were carried out to study the thermal decomposition and reducibility behaviors and the number of active sites of Pt-Co/AC, respectively. The results showed that the catalytic activities of Pt-Co/AC with different Co contents depended on the active site number. With the increase of Co content the catalytic activity and active sites number of Pt-Co/AC displayed the volcano curves, and reached their maximum value at 20% Co. On the other hand, the catalytic activity of Pt-Co/AC decreased slightly with the decrease of Pt content when the Pt mass fractionranged between 0.3% -- 1.2%. It is found that small activity of Pt-Co/AC significantly, demonstrating hydrogenation at atmospheric pressure and at both 70℃ amount of Pt the excellent could enhance the performance in and room temperature （30℃）. catalytic benzene

关 键 词：双金属催化剂 PT Co 活性炭 苯 加氢 

分 类 号：O643.3[理学—物理化学]