Water-improved heterogeneous transfer hydrogenation using methanol as hydrogen donor over Pd-based catalyst
Water-improved heterogeneous transfer hydrogenation using methanol as hydrogen donor over Pd-based catalyst
复制标题
钯基催化剂上使用甲醇作为氢供体的水改进非均相转移加氢
DOI：
10.1016/j.apcata.2010.01.004
复制
发表时间：
2010-03
期刊：
影响因子：
--
通讯作者：
Zhang, Qunfeng
中科院分区：
文献类型：
--
作者：
Xiang, Yizhi;Li, Xiaonian;Lu, Chunshan;Ma, Lei;Zhang, Qunfeng
在固定床反应器中，以甲醇为供氢体，研究了苯乙烯和硝基苯在钯基催化剂上的非均相催化转移加氢反应。随着水醇摩尔比从0增加到1，苯乙烯和硝基苯的转化率分别从26.3%和7.1%增加到100%和31.9%，苯胺的选择性从22.0mol %增加到94.5mol%。水的存在通过水与由甲醇脱氢形成的甲醛快速反应成甲酸而改善了从甲醇到苯乙烯或硝基苯的氢转移，甲酸是不饱和有机物的CTH的优良氢供体。在水的存在下，甲醇是比异丙醇、正丙醇和乙醇更好的氢供体，因为水不能容易地与分别由异丙醇、正丙醇和乙醇形成的丙酮、丙醛和乙醛反应。此外，甲醇供体在水存在下的氢原子利用率高于其他供体，部分水中的氢原子也可用于还原不饱和有机物。
The heterogeneous catalytic transfer hydrogenation (CTH) of styrene and nitrobenzene over Pd-based catalyst using methanol as hydrogen donor was investigated in a fixed-bed reactor. With the increase of the molar ratio of water to methanol from 0 to 1, the conversions of styrene and nitrobenzene are increased from 26.3% and 7.1% to 100% and 31.9%, respectively, and the selectivity of aniline is increased from 22.0 to 94.5mol%. The presence of water improves the hydrogen transfer from methanol to styrene or nitrobenzene through the quick reaction of water with formaldehyde, formed from the dehydrogenation of methanol, into formic acid, which is an excellent hydrogen donor for the CTH of unsaturated organics. In the presence of water, methanol is a better hydrogen donor than isopropanol, n-propanol and ethanol, because water cannot easily react with acetone, propionaldehyde, and acetaldehyde formed from isopropanol, n-propanol, and ethanol, respectively. Additionally, the hydrogen atom utilization of the methanol donor in the presence of water is higher than the other donors, hydrogen atom in a part of water can also be utilized for the reduction of unsaturated organics.
登录
查看更多内容
影响因子：
15
作者：
BAILAR, JC;ITATANI, H
通讯作者：
ITATANI, H
影响因子：
3.6
作者：
H. Wiener;J. Blum;Y. Sasson
通讯作者：
H. Wiener;J. Blum;Y. Sasson
影响因子：
9.8
作者：
Jun Li;Yanmei Zhang;Difei Han;G. Jia;Jinbo Gao;Lin Zhong;Can Li
通讯作者：
Jun Li;Yanmei Zhang;Difei Han;G. Jia;Jinbo Gao;Lin Zhong;Can Li
影响因子：
22.1
作者：
P. Selvam;S. Mohapatra;Sachin U. Sonavane;R. Jayaram
通讯作者：
P. Selvam;S. Mohapatra;Sachin U. Sonavane;R. Jayaram
影响因子：
5.5
作者：
St. Ruf;A. May;G. Emig
通讯作者：
St. Ruf;A. May;G. Emig