Formation of the Phase Composition, Porous Structure, and Morphology of Membrane Catalysts Based on Tungsten Carbides

Membrane catalysts are prepared by the chemical vapor-phase deposition of tungsten oxides on a corundum porous microfiltration membrane. The massive layer of tungsten oxides formed on the substrate is converted to carbides by temperature-programmed carbidization with С 3 Н 8 /Н 2 and СН 4 /Н 2 mixtu...

Full description

Saved in:
Bibliographic Details
Published in:Petroleum chemistry 2020-05, Vol.60 (5), p.622-629
Main Authors: Gavrilova, N. N., Skudin, V. V., Shamkina, N. A., Shul’min, D. A.
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysts
Chemical synthesis
Chemistry
Chemistry and Materials Science
Corundum
Deposition
Industrial Chemistry/Chemical Engineering
Membranes
Microfiltration
Morphology
Phase composition
Scanning microscopy
Substrates
Tungsten
Tungsten carbide
Tungsten compounds
Tungsten oxides
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Membrane catalysts are prepared by the chemical vapor-phase deposition of tungsten oxides on a corundum porous microfiltration membrane. The massive layer of tungsten oxides formed on the substrate is converted to carbides by temperature-programmed carbidization with С 3 Н 8 /Н 2 and СН 4 /Н 2 mixtures. Changes in the porous structure and phase composition of the catalytic layer at stages of vapor-phase deposition and carbidization of oxides deposited on the corundum substrate are considered. Dependence of the depth of distribution of tungsten compounds on the deposition temperature is studied by electron scanning microscopy and X-ray spectroscopy. A relationship is established between the synthesis conditions of tungsten carbide-based membrane catalysts and their phase composition, porous structure characteristics, and morphology.
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544120050035