PHASE-COMPOSITION OF THE PRODUCTS FORMED AFTER REDUCTION OF A COPRECIPITATED NIO-WO3 SYSTEM

Authors
PAVLOVA LI
Citation
Li. Pavlova, PHASE-COMPOSITION OF THE PRODUCTS FORMED AFTER REDUCTION OF A COPRECIPITATED NIO-WO3 SYSTEM, Kinetics and catalysis, 39(3), 1998, pp. 430-433
Citations number
13
Categorie Soggetti
Chemistry Physical
Journal title
Kinetics and catalysis → ACNP
ISSN journal
00231584
Volume
39
Issue
3
Year of publication
1998
Pages
430 - 433
Database
ISI
SICI code
0023-1584(1998)39:3<430:POTPFA>2.0.ZU;2-A
Abstract
The phase composition of the products formed after reduction of the co precipitated NiO-WO3 (Ni :W = 1:1) system is studied by X-ray diffract ion analysis. It is shown that a disordered Ni-W alloy with an FCC lat tice and an amorphous tungsten oxide phase are formed at 450 degrees C in hydrogen. Thermal treatment of the reduced system in helium at 850 degrees C results in the formation of crystalline WO2 and W18O49 oxid es and in a decrease in the parameter of the alloy lattice.