EFFECT OF F AND MG ON THE DISPERSION OF MO/AL2O3 AND W/AL2O3

被引：18

作者：

MULCAHY, FM ^{[1
]}

HOUALLA, M ^{[1
]}

HERCULES, DM ^{[1
]}

机构：

[1] UNIV PITTSBURGH,DEPT CHEM,PITTSBURGH,PA 15260

来源：

JOURNAL OF CATALYSIS | 1993年 / 139卷 / 01期

关键词：

D O I：

10.1006/jcat.1993.1008

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：

Samples containing 8% Mo and l5% W supported on magnesium- and fluoride-modified aluminas were prepared by incipient wetness impregnation and examined in the dried and calcined states using X-ray photoelectron spectroscopy (XPS, ESCA). The presence of fluoride as an additive decreased the dispersion of the Mo and W phases for dried samples. The opposite effect was observed for dried Mg-modified samples. The effects of F and Mg addition largely disappeared when the samples were calcined. The results are interpreted in terms of the interactions between Mo and W species and the basic hydroxyl groups of the alumina. © 1993 Academic Press, Inc.

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页码：72 / 80

页数：9

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