SURFACE DISPERSION OF MOLYBDENA SUPPORTED ON SILICA, ALUMINA AND TITANIA

被引：15

作者：

DELARCO, M

CARRAZAN, SRG

MARTIN, C

MARTIN, I

RIVES, V

MALET, P

机构：

[1] UNIV SALAMANCA,FAC FARM,DEPT QUIM INORGAN,E-37007 SALAMANCA,SPAIN

[2] UNIV SEVILLA,FAC QUIM,DEPT QUIM INORGAN,E-41012 SEVILLE,SPAIN

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1993年 / 3卷 / 12期

关键词：

MOLYBDENA; SUPPORTED CATALYST; LASER RAMAN SPECTROSCOPY;

D O I：

10.1039/jm9930301313

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Surface species formed upon impregnation of silica, alumina and titania with aqueous solutions of ammonium molybdate and calcination at 770 K have been studied by X-ray diffraction, specific surface area assessment, scanning electron microscopy, laser Raman spectroscopy and temperature-programmed reduction. Dispersion decreases in the order TiO2 > Al2O3 much greater than SiO2. Polymolybdate species are formed for low loadings, that lead to bulk MoO3 for loadings of 0.4 monolayer on SiO2, but persist for higher loadings on titania and alumina. On this last support, isolated molybdate species have been also found.

引用

页码：1313 / 1318

页数：6

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