Cover Image

Surface reactions with participation of oxides of molybdenum and tungsten: the influence of external factors

A. F. Guseva, M. V. Trifonova, N. N. Pestereva

Abstract


This work is a continuation of the article "Surface reactions with participation of oxides of molybdenum and tungsten", published in the previous issue of the journal. The influence of the electric field and the pressure of oxygen in the gas phase on the rate of surface reactions for the synthesis of molybdates of manganese and copper were investigated. It’s found that for the synthesis reaction of molybdate of copper the nature of the dependency of the rate of synthesis and rate of surface reactions from the external parameters are the same, indicating the crucial contribution of surface diffusion to the reactive mass transfer. For the synthesis reaction of molybdate of manganese the dependences of the rate of synthesis and of rate of surface reactions by external parameters differ, indicating that for this reaction, surface diffusion isn’t the main mechanism of mass transfer.

Keywords


mass transfer; reaction surface diffusion; surface reactions; molybdates; tungstates

Full Text:

PDF

References


Neiman AYa, Guseva AF. New Data on Mechanism of Mass Transfer in Solid-State Reactions I. Reactions in an Electric Field. Kinet Catal. 1994;35(II):188-194.

Neiman AYa, Guseva AF. New Data on the Mechanism of Mass Transfer in Solid-Phase Reactions: II. Chemical and Electrochemical Surface Phenomena. Kinet Catal. 1999;40(I):38-49.

Neiman AYa, Guseva AF, Trifonova MV. Surface Reaction in the course of molybdates and tungstates formation. Solid State Ionics. 2001;141-2:321-9. doi:10.1016/S0167-2738(01)00798-6

Neiman AYa, Guseva AF, Trifonova MV, Sukhankina IV. Reactive Surface Diffusion during Synthesis of Molybdates and Tungstates: The Role of Phase Constitution of Product. Russ J Inorg Chem. 2005;50:319-24.

Neiman AYa, Guseva AF. Electrochemical approach to solid state reactions and interphase phenomena. Russ J Electrochem. 1993;29(11):1388-95.

Neiman AYa, Fedorova LM, Afanasyev AA. Point defect interaction in PbMoO4. Inorg Mater. 1986;22(5):811-5.

Neiman AYa. Cooperative transport in oxides: Diffusion and migration processes involving Mo (VI), W (VI), V (V) and Nb (V). Solid State Ionics. 1996;83(3-4):263-73. doi:10.1016/0167-2738(95)00247-2




DOI: http://dx.doi.org/10.15826/chimtech.2016.3.1.006

Copyright (c) 2016 A. F. Guseva, M. V. Trifonova, N. N. Pestereva

© Chimica Techno Acta, 2014-2018
ISSN 2411-1414 (Online), ISSN 2409-5613 (Print)

ROAD logo WorldCat logo DOAJ logo CAS logo BASE logo eLibrary logo