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[1]王 锐1,2,余甜雨1,等.热处理对Cu/Ag-OMS-2催化剂中铜物种表面状态的影响[J].武汉工程大学学报,2015,37(09):18-23.[doi:10. 3969/j. issn. 1674-2869. 2015. 09. 003]
 ,,et al.Effects of calcination treatment on surface state of copper species in Cu/Ag-OMS-2 catalysts[J].Journal of Wuhan Institute of Technology,2015,37(09):18-23.[doi:10. 3969/j. issn. 1674-2869. 2015. 09. 003]
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热处理对Cu/Ag-OMS-2催化剂中铜物种表面状态的影响(/HTML)
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《武汉工程大学学报》[ISSN:1674-2869/CN:42-1779/TQ]

卷:
37
期数:
2015年09期
页码:
18-23
栏目:
化学与化学工程
出版日期:
2015-09-30

文章信息/Info

Title:
Effects of calcination treatment on surface state of copper species in Cu/Ag-OMS-2 catalysts
文章编号:
1674-2869(2015)09-0018-06
作者:
王 锐1余甜雨1曾 琴1李 艳1 刘 慧1 邓 尉1 杨小俊12*
1.绿色化工过程教育部重点实验室(武汉工程大学),湖北 武汉430074;2.武汉工程大学化工与制药学院,湖北 武汉430074
Author(s):
YANG Xiao-jun1DENG Wei1WU Yuan-xin1 DU Zhi-ping1
1.Key Laboratory of Green Chemical Process (Wuhan Institute of Technology),Ministry of Education, Wuhan 430074, China;2. School of Chemical Engineering&pharmacy, Wuhan Institute of Technology, Wuhan 430074, China
关键词:
碳酸二甲酯甲醇氧化羰基化锰氧八面体分子筛铜催化剂
Keywords:
dimethyl carbonate methanol oxidative carbonylation manganese oxygen octahedral molecular sieve copper catal
分类号:
TQ 225.52
DOI:
10. 3969/j. issn. 1674-2869. 2015. 09. 003
文献标志码:
A
摘要:
对Cu/Ag-OMS-2(OMS-2为锰氧八面体分子筛)催化剂中铜物种在热处理过程中的分散情况和存在形式进行了研究,通过X射线衍射、扫描电子显微镜表征手段分别考察了焙烧温度、焙烧时间和活性组分负载量不同时催化剂中铜物种的表面状态,并分析了铜物种表面状态对催化氧化羰基化合成碳酸二甲酯反应的影响. 结果表明,在热处理过程中,铜物种以片状形式均匀排列堆积,有利于反应物的吸附,有利于催化剂活性的提升;活性组分主要以氯化铜(CuCl)形式存在,受热部分分解为含有Cu+和Cu2+的铜氧化物6CuO·Cu2O,两种不同价态的铜物种的存在促进反应物的解离吸附,有利于提升催化活性. 较适宜的催化剂热处理条件为:CuCl的负载量为25%,焙烧温度为500 ℃,焙烧时间为5 h,催化合成碳酸二甲酯的收率最高可达85%.
Abstract:
The dispersion state and the existence form of copper species in Cu/Ag-OMS-2 catalysts were investigated. The surface states of copper species at different calcination temperatures, different calcination times and different CuCl loadings were studied by X-ray diffraction and scanning electron microscope. The effects of surface state of copper species on catalytic performance of Cu/Ag-OMS-2 in oxidative carbonylation of methanol were also determined. The results show that the copper species existed in thin slice form and disperse well on the catalyst surface after calcination treatment,which is beneficial to adsorption of the reactants and catalytic activities; the active species exist mainly in the form of CuCl, and partly decompose into 6CuO·Cu2O including Cu+ and Cu2+ species; the mixed valence of copper species is advantageous to good catalytic performance. The optimal preparation condition of Cu/Ag-OMS-2 catalysts is calcined at 500 ℃ for 5 h and the CuCl loading of 25%, and the yield of dimethyl carbonate for corresponding catalyst reaches 85%.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2006-06-18基金项目:湖北省自然科学基金(2013CFB322);湖北省教育厅青年人才项目(Q20131503);绿色化工过程教育部重点实验室开放基金项目(GCP201301);武汉工程大学青年基金项目(10112061)作者简介:王锐(1993-),男,湖北随州人,本科生.* 通信联系人
更新日期/Last Update: 2015-10-19