Chemism and mass-transfer routes during phase formation in the V2O5 vertical bar M0O(3) system / Neiman AY,Trafieva MF,Kostikov YP // RUSSIAN JOURNAL OF INORGANIC CHEMISTRY. - 2005. - V. 50, l. 10. - P. 1472-1484.

ISSN/EISSN:

0036-0236 / нет данных

Type:

Article

Abstract:

The set of conversions accompanying the complex multistep interaction between V2O5 and MoO3 in atmospheres with a variable or controlled oxygen activity in the range 1 >= ao(2) >= 10(-3) was studied using modeling methods. This process was shown to be implemented through a consecutive-parallel set of nonequivalent counterflows of the components of the specified oxides located on the outer surface of the reagents or in interphase contact sites of their inner surface. Surface propagation of the MoO3 components or the gamma phase of V2O5-base solid solutions along the V(2)O(5)vertical bar gas interface was observed. Possible reasons for the different responses of the process rates as determined from the weight change and the interpenetration depth of the components were analyzed. From this analysis, different micromechanisms were inferred for the intergrain and surface mass transfer. The infinitesimal solubility of V2O5 in MoO3 was thermodynamically substantiated and experimentally confirmed. It was shown that a composite-type two-phase dispersed system is formed in the course of V-Mo-O mass transfer over the MoO3 grain surface due to the dispersion of the V-Mo-O component induced by the chemical field. The main mass-transfer fluxes were identified, and their mechanisms were evaluated. The surface energy ratio between the reagents and products was demonstrated to play a role in the chemical mechanism of the process. The kinetic parameters of the mass transfer for various mechanisms were estimated.

Author keywords:

OXIDES; TRANSPORT

DOI:

нет данных

Web of Science ID:

ISI:000232900600002

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	OCT
Publisher	INTERPERIODICA
Address	PO BOX 1831, BIRMINGHAM, AL 35201-1831 USA
Language	English
Keywords-Plus	OXIDES; TRANSPORT
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear
Author-Email	arkady.neiman@usu.ru
Number-of-Cited-References	27
Journal-ISO	Russ. J. Inorg. Chem.
Doc-Delivery-Number	978VH