Ni对Pt/γ-Al_2O_3催化甲基环己烷脱氢性能的影响  

Effect of Ni on the catalytic performance of Pt/γ-Al_2O_3 in methylcyclohexane dehydrogenation

作　　者：童凤丫[1] 孙清[1] 邵一凡[1] 缪长喜[1] 王仰东[1] 谢在库[2] 

机构地区：[1]中国石油化工股份有限公司上海石油化工研究院,上海201208 [2]中国石油化工股份有限公司,北京100027

出　　处：《化工进展》2016年第B11期183-186,共4页Chemical Industry and Engineering Progress

摘　　要：采用饱和浸渍法制备了γ-Al_2O_3负载的Pt单金属和Pt-Ni双金属催化剂,用固定床反应器评价了催化剂的甲基环己烷脱氢反应性能,以考察Ni对Pt/γ-Al_2O_3催化甲基环己烷脱氢性能的影响。结果表明,与单金属催化剂相比,Pt-Ni双金属催化剂具有更好的脱氢活性和稳定性。氢氧滴定分析结果表明加入Ni后Pt的分散性能变好,TEM分析表明加入Ni后金属颗粒尺寸变大,结合氢氧滴定与TEM数据,认为掺入Ni之后形成了Pt-Ni新的体系,此体系提高了催化剂表面上氢的结合能,最终提高了Pt-Ni双金属催化剂的脱氢活性和稳定性。此结果为开发适用于有机液体储氢材料脱氢的高效催化剂提供了思路。Pt-Ni bimetallic catalysts and the corresponding monometallic Pt catalysts supported on γ-Al2O3 were prepared by incipient wetness impregnation and characterized by X-ray diffraction, H2-chemisorption and BET. Their activities for methylcyclohexane dehydrogenation were investigated in a fixed bed reactor. The results showed that the Pt-Ni bimetallic catalyst significantly enhanced hydrogen evolution and catalytic stability compared with Pt monometallic catalyst. H2-chemisorption revealed that the adding of Ni increased the dispersion of Pt, while TEM showed that a larger particle size of Pt. Combined the two characterization results, we concluded that the adding of Ni leaded a new Pt-Ni system which increased the binding energy of the bimetallic surface, and this finally increased the activity and stability of catalyst. The results offered a new way to develop high efficiency dehydrogenation catalyst.

关 键 词：甲基环己烷 脱氢 稳定性 活性 

分 类 号：TQ032[化学工程]