Cu/Al_2O_3/ZnO三元模型催化剂的制备及其氧化还原性能的研究
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- 英文论文题名：The Preparation and Redox Properties of Ternary Model Catalyst:Cu/Al_2O_3/ZnO(0001)-Zn
- 论文作者：胡俊 ; 黄俊杰 ; 张宏 ; 陈明树 ; 万惠霖
- 英文论文作者：Jun Hu ; Junjie Huang ; Hong Zhang ; Mingshu Chen ; Huilin Wan ; State Key Laboratory of Physical Chemistry of Solid Surfaces ; National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters ; Department of Chemistry ; College of Chemistry and Chemical Engineering ; Xiamen University
- 年：2016
- 作者机构：固体表面物理化学国家重点实验室醇醚酯化工清洁生产国家工程实验室厦门大学化学化工学院化学系厦门大学;
- 论文关键词：模型催化剂 ; 铜 ; 氧化铝 ; 氧化锌
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第十五分会：表界面结构调控与催化
- 语种：中文
- 分类号：O643.36
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第十五分会 ; 表界面结构调控与催化
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：229k
- 原文格式：D
- 会议级别：全国
摘要
铜基催化剂(Cu/Zn O/Al_2O_3)是甲醇合成反应中常用的工业催化剂,但目前对于该反应的活性位点及机理的争论还比较多[1]。使用结构明确均一的模型催化剂能够有效理解催化结构与性能之间的关系。目前有关铜基模型催化剂的研究,主要集中在Cu/Zn O二元组分,缺乏对Al_2O_3的深入认识。在此研究中,我们分别制备了Cu/Al_2O_3/Zn O(0001)-Zn、Al_2O_3/Zn O(0001)-Zn、Cu/Zn O(0001)-Zn三种模型催化剂,并对其氧化还原性能进行了XPS及LEIS的分析。结果显示,在实验条件下,Al_2O_3在Zn O(0001)-Zn的表面以层层生长的模式进行生长,Cu在Zn O(0001)-Zn的表面先以二维岛状的模式生长,再三维岛状生长。氧化还原的过程显示,相对于二元模型催化剂Cu/Zn O(0001)-Zn,一定量的Al_2O_3的加入能够有效延缓Cu2+的还原过程,稳定Cu+。
The Cu/Al_2O_3/ZnO(0001)-Zn ternary model catalysts were prepared and characterized,as well as the growth models of binary model catalysts:Al_2O_3/ZnO(0001)-Zn and Cu/Zn O(0001)-Zn.It was found that Al_2O_3 grew on the ZnO(0001)-Zn surface by a layer-by-layer model,while Cu formed two-dimensional islands only at low coverage and three dimensional clusters at high coverage.Comparing to the Cu/Zn O binary model catalyst,the addition of Al_2O_3 obviously slowed down the reduction of Cu/Al_2O_3/ZnO by H_2,which may help to stabilize the surface Cu+.
The Cu/Al_2O_3/ZnO(0001)-Zn ternary model catalysts were prepared and characterized,as well as the growth models of binary model catalysts:Al_2O_3/ZnO(0001)-Zn and Cu/Zn O(0001)-Zn.It was found that Al_2O_3 grew on the ZnO(0001)-Zn surface by a layer-by-layer model,while Cu formed two-dimensional islands only at low coverage and three dimensional clusters at high coverage.Comparing to the Cu/Zn O binary model catalyst,the addition of Al_2O_3 obviously slowed down the reduction of Cu/Al_2O_3/ZnO by H_2,which may help to stabilize the surface Cu+.
引文
[1]Kasatkin,I.;Kurr,P.;Kniep,B.;Trunschke,A.;Schl?gl,R.Angew.Chem.2007,119(38):7465.