CHARACTERIZATION OF THE SURFACE-PROPERTIES OF POLYCRYSTALLINE WO3

被引：63

作者：

RAMIS, G

CRISTIANI, C

ELMI, AS

VILLA, P

BUSCA, G

机构：

[1] UNIV GENOA,FAC INGN,IST CHIM,P KENNEDY,I-16129 GENOA,ITALY

[2] POLITECN MILAN,DIPARTIMENTO CHIM IND & INGN CHIM GIULIO NATTA,I-20133 MILAN,ITALY

来源：

JOURNAL OF MOLECULAR CATALYSIS | 1990年 / 61卷 / 03期

关键词：

D O I：

10.1016/0304-5102(90)80006-5

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：

Tungsten trioxide was precipitated from an ammonium paratungstate aqueous solution at acid pH. The precipitated material consists of a mixture of hexagonal and pseudocubic WO3. After calcination at about 700 K, it transforms into monophasic pseudocubic WO3 (15m2 g-2). FTIR investigation of adsorbed water, ammonia, pyridine, pivalonitrile and CO2 indicates an acid nature of the surface. Two types of strong Lewis acid sites, as well as Brönsted acid sites, have been detected. Models are proposed for the surface sites of WO3, and the catalytic activity of WO3-containing catalysts is briefly discussed in relation to their surface chemistry. © 1990.

引用

页码：319 / 331

页数：13

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