Journal of the Chemical Society - Faraday Transactions p. 1577 - 1582 (1992)
Update date:2022-08-11
Topics:
Imamura, Hayao
Hiranaka, Shingo
Sakata, Yoshihisa
Tsuchiya, Susumu
The Eu-Ni and Yb-Ni (Ln-Ni) bimetallic catalysts, prepared by the reaction of nickel powders with lanthanides dissolved in liquid ammonia, have been characterised by the dehydrogenation of cyclohexane combined with isotopic exchange between cyclohexane and deuterium.Their catalytic behaviour varied markedly with different levels of lanthanide content.First, the relative rates of cyclohexane dehydrogenation decreased when the isotopic exchange reactions exhibited a similar dependence of activity on lanthanide content.An analysis of the initial decrease in the rates of reaction suggested a decrease in catalytically active nickel sites due to coating with lanthanide metals.The surface is gradually covered with the lanthanide metals and simultaneously certain interactions occur to produce newly active centres in the region of high loading, resulting in acceleration of the dehydrogenation and isotope-exchange reaction.The presence of lanthanide metals on Ni enhanced the capacity of this surface to dissociate the C-H bond.Multiple exchange for the reactions between cyclohexane and deuterium tended to decrease with increasing loading of lanthanides.Furthermore, the effects of a lanthanide metal overlayer on the reaction kinetics over an Ni metal surface were discussed.
View MoreSichuan Sangao Biochemical Co., Ltd
Contact:+86-28-84874233
Address:19F, Bldg.2, Shudu Center, Tianfu 2nd St., Hi-tech zone, Chengdu 610041, Sichuan Province, China.
Shantou Baokang Pharmaceutical Co., Ltd.
Contact:+86-754-88873487
Address:5/F B Block Huangshan Bldg Huangshan Rd Shantou
Hangzhou Ocean Chemical Co., Ltd.
website:http://www.hzoceanchem.com
Contact:+86-571-88025872, 28272092, 28272096
Address:Room 623 ,Building No 1 , COFCO Radius Commercial Center Xiwen Road, Xiacheng District, Hangzhou, Zhejiang Province, China
website:http://www.china-sinoway.com
Contact:+86-592-5853819
Address:16/F,Huicheng Comm,Complex,No839 XiaHe Rd, Xiamen,China
Suzhou Sibian Chemical Technology Co., Ltd
website:http://www.sibianpharm.com
Contact:+8618169181984,+8618013186906
Address:Room1404,BuildingA,Jiabao Square No.323 Baodai East Road,Wuzhong District,Suzhou Jiangsu China (215128)
Doi:10.1021/ol902680k
(2010)Doi:10.1080/00397911.2021.1960377
(2021)Doi:10.1111/j.1365-2621.2002.tb08734.x
(1935)Doi:10.1039/j19710003606
(1971)Doi:10.1002/cssc.201900833
(2019)Doi:10.1002/cjoc.201600801
(2017)
