Influence of ZrO2 and ZrV2O7 on the polymorphic transformation of anatase into rutile

Autor:	T. P. Mikhailovskaya, Pavel Vorobiov, Olga Yugay, Dauren Chamitovitch Sembaev, L. I. Saurambaeva
Rok vydání:	2011
Předmět:	Anatase Ternary numeral system Materials science Inorganic chemistry Catalysis Vanadium oxide chemistry.chemical_compound chemistry Chemical engineering Rutile Alkylbenzenes Physical and Theoretical Chemistry Ternary operation Ammoxidation
Zdroj:	Reaction Kinetics, Mechanisms and Catalysis. 105:373-379
ISSN:	1878-5204 1878-5190
DOI:	10.1007/s11144-011-0389-x
Popis:	The effect of ZrO2 and ZrV2O7 on the polymorphic transformation of anatase to rutile in the TiO2–V2O5, TiO2–ZrO2, TiO2–ZrV2O7, and V2O5–TiO2–ZrO2 systems has been investigated. It is shown that the temperature and duration of the heat treatment influence on the anatase stability in the investigated binary and ternary systems. It is established that V2O5 and ZrV2O7 accelerate the polymorphic transformation of anatase to rutile, but ZrO2 inhibits the phase change. Taking into account the ratio between V2O5, ZrO2, and ZrV2O7, formed in the ternary system, it is possible to maintain a definite quantity of anatase in a catalyst system. This permits one to influence the activity and selectivity of the modified vanadium oxide catalysts in the oxidation and ammoxidation of alkylbenzenes and alkylpyridines.
Databáze:	OpenAIRE
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