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助剂La对Ni/γ-Al2O3催化剂加氢性能的影响

作者:时间:2016-08-22点击数:

PDF全文下载:2016040388

刘淑芝a,b, 徐培强a, 李瑞达a

(东北石油大学a.化学化工学院;b.石油与天然气化工省重点实验室,黑龙江 大庆163318)

摘要: 采用等体积浸渍法制备了添加La助剂的Ni-La/γ-Al2O3催化剂,用于苯加氢制环己烷反应,考察了La助剂对催化剂加氢性能的影响以及反应条件对催化剂活性的影响,并用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对催化剂进行了表征。结果表明:稀土氧化物La2O3可使催化剂中Ni晶粒度变小,分散度增加,且能削弱载体与Ni物种之间的相互作用,抑制NiAl2O4的形成,提高催化剂的加氢活性。在反应压力0.8 MPa、反应温度160℃、氢/苯比(氢气与苯的物质的量比)4∶1、空速(单位时间内催化剂处理物料的体积与所用催化剂的体积比)6 h-1的条件下,苯加氢制环己烷产率可达100%。

关键词: 苯加氢; 镍; 镧; 环乙烷

中图分类号:TQ 426.6; O 643.36文献标志码:A

Effect of La on Ni/γ-Al2O3 Catalyst in Benzene Hydrogenation

LIU Shuzhia,b, XU Peiqianga, LI Ruidaa

(a.College of Chemistry and Chemical Engineering; b.Province Key Laboratory of Oil and Natural Gas Chemical Industry, Northeast Petroleum University, Daqing 163318, China)

Abstract: A series of Ni-La/γ-Al2O3 catalysts were prepared by adding La and adopting the methods of isometric impregnation. The catalysts were characterized with XRD and SEM, respectively. Inspecting the effects of adding La on the hydrogenation activity of catalysts. The results show that adding a moderate amount of La promotes the dispersing of Ni on the carrier, weaks the interaction between Ni and the carrier further, inhibits the formation of NiAl2O4. And the activity of La2O3catalyst was higher than Ni /γ-Al2O3. The conversion rate is 100% with the best reaction conditions: p=0.8 MPa, T=160 ℃, n(H2)∶n(benzene)=4∶1, air speed 6 h-1.

Key words:  benzene hydrogenation; Ni; La; cyclohexane

收稿日期:20150519

作者简介: 刘淑芝(1966—),女,教授.

文章编号:16726987(2016)04038804; DOI: 10.16351/j.16726987.2016.04.007

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