[1]李 祥,焦志锋,赵吉晓,等.Ag/SiC和Ag/Al2O3-SiC催化剂的乙烯环氧化催化性能[J].常州大学学报(自然科学版),2024,36(02):85-92.[doi:10.3969/j.issn.2095-0411.2024.02.009]
　LI Xiang,JIAO Zhifeng,ZHAO Jixiao,et al.Catalytic performances of Ag/SiC and Ag/Al2O3-SiC catalysts for ethylene epoxidation[J].Journal of Changzhou University(Natural Science Edition),2024,36(02):85-92.[doi:10.3969/j.issn.2095-0411.2024.02.009]
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Ag/SiC和Ag/Al2O3-SiC催化剂的乙烯环氧化催化性能()
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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:
第36卷
期数:
2024年02期
页码:
85-92
栏目:
化学化工
出版日期:
2024-03-28

文章信息/Info

Title:
Catalytic performances of Ag/SiC and Ag/Al2O3-SiC catalysts for ethylene epoxidation
文章编号:
2095-0411(2024)02-0085-08
作者:
李 祥1; 2;  焦志锋1;  赵吉晓1;  魏珍妮3;  刘 宇1;  郭向云1
1.常州大学 石油化工学院, 江苏 常州 213164; 2.常州大学 材料科学与工程学院, 江苏 常州 213164; 3.中国石油天然气股份有限公司石油化工研究院 兰州化工研究中心, 甘肃 兰州 730060
Author(s):
LI Xiang1; 2;  JIAO Zhifeng1;  ZHAO Jixiao1;  WEI Zhenni3;  LIU Yu1;  GUO Xiangyun1
1.School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China; 2.School of Materials Science and Engineering, Changzhou University,Changzhou 213164, China; 3.Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina Co., Ltd., Lanzhou 730060, China
关键词:
Ag/SiC催化剂;  乙烯环氧化;  Al2O3修饰
Keywords:
Ag/SiC catalysts;  ethylene epoxidation;  Al2O3 modification
分类号:
O 643
DOI:
10.3969/j.issn.2095-0411.2024.02.009
文献标志码:
A
摘要:
制备了高分散的Ag/SiC和Al2O3修饰的Ag/SiC催化剂,并用于乙烯环氧化反应。结果显示,Al2O3修饰的Ag/SiC催化剂对乙烯的转化率显著提高,但环氧乙烷的选择性急剧降低。进一步研究发现,在反应过程中乙烯吸附在SiC表面; O2在Ag表面解离后,活性O物种溢流到SiC表面参与环氧化反应。Al2O3修饰后改变了Ag的电子性质,抑制了活性O物种在SiC表面的迁移,导致反应性能的改变。该工作为乙烯环氧化催化剂的设计提供了一定的参考。
Abstract:
Highly dispersed Ag/SiC and Al2O3 modified Ag/SiC catalysts were prepared and employed for ethylene epoxidation. The results showed that the conversion of ethylene was significantly improved after Al2O3 modification, but the selectivity of ethylene oxide was sharply reduced. Further studies revealed that ethylene was adsorbed on SiC surface in the reaction. After O2 was dissociated on the Ag surface, the active O species spilled over to SiC surface to participate in the epoxidation reaction. The Al2O3 modification altered the electronic properties of Ag and inhibited the migration of active O species on SiC surface, resulting in the change of ethylene epoxidation performances. This work provides some reference for the design of catalysts for ethylene epoxidation.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2024-01-16。
基金项目: 中国石油-常州大学创新联合体资助项目(2021DQ06)。
作者简介: 李祥(1996—), 男, 河南南阳人, 博士生。 通信联系人: 焦志锋(1988—), E-mail: jiaozhifeng@cczu.edu.cn
更新日期/Last Update: 1900-01-01