Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics p. 184 - 195 (1995)
Update date:2022-08-17
Topics:
Ma
Chuah
Jaenicke
Gopalakrishnan
Tan
Manganese oxide deposited on alumina and magnesia by different preparation methods has been studied with respect to its surface structure and reactivity. The controlled deposition of mono-atomic layers is effected by a grafting reaction between surface hydroxyl groups and manganese ethoxide. Repeated grafting allows multiple layers to be built up in a controlled manner. The properties of these catalysts differ from those prepared by conventional wet impregnation techniques and mechanical mixing. Test reactions involving carbon monoxide oxidation and isopropanol decomposition reveal significant differences in the activity and selectivity of the catalysts prepared by grafting, impregnation and mechanical mixing. The manganese oxide grafted to alumina shows bulk-like properties after a full monolayer is built up. XPS studies show that the grafting reaction leads to continuous films of the manganate covering the entire surface with monolayer thickness, whereas impregnation most likely results in small crystallites which cover only part of the surface. The calcination temperature is an important parameter determining the oxidation state of the manganese and the crystallinity of the oxide. Ammonia and isopropanol temperature-programmed desorption indicates that the acid/base and redox properties of the catalysts are considerably modified by a strong interaction between the support and the overlayer.
View MoreMedicalChem(Yancheng)Manuf.Co.,Ltd.
Contact:+86-515-84383366
Address:Touzeng BinHai, YanCheng City, JiangSu Province, China
Dalian Synco Chemical Co., Ltd.
Contact:+86-411-83635150
Address:Rm 1004, 24, Tangshan Street, Dalian
Contact:86-791-86629460
Address:1-6F, 118 Xinzhou road, Nanchang, Jiangxi, China
Shanghai WinTide BioTechnology Co.,Ltd
Contact:86-21-37100630
Address:No. 908 Yunhe Road, Fengxian district, Shanghai
Nantong Kaixin Pharma Chemical Co.,Ltd.
Contact:86-513-85250786
Address:2-1103 Huachen Mansion, 111 Gongnong Road,Nantong, Jiangsu, China
Doi:10.1039/d0dt02601h
(2020)Doi:10.1246/cl.1998.1143
(1998)Doi:10.1007/s10789-005-0122-0
(2005)Doi:10.1021/jo00914a014
(1975)Doi:10.1080/17415993.2020.1770252
(2020)Doi:10.1016/S0031-9422(00)82534-0
(1985)