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Composition, structure and surface acid-base behaviour of manganese oxide dispersed on silica

✍ Scribed by M.I Zaki; A.K.H Nohman; G.A.M Hussein; Y.E Nashed

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
514 KB
Volume
99
Category
Article
ISSN
0927-7757

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✦ Synopsis

Silica-supported manganese oxides were derived by calcination at 870 and 1270 K of manganese nitrate-impregnated and manganese oxide-coated silicas (at 10 wt.%Mn). Characterization of the products was carried out by X-ray powder diffraction, volumetric analysis of nitrogen adsorption at 77 K, and infrared spectroscopy of pyridine adsorption at 300-670 K. The results indicate that the impregnated silicas evolve highly accessible surfaces dispersing non-crystalline MnOx and MnzSiOa-like species, and consequently expose strong Lewis and Bronsted acid sites. Thus, the potential activity of these materials in acid-catalyzed reactions is implied.

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