Abstract: Small addition of potassium to V/Ti-oxide catalyst (K:V=0.19), consisting of 3.7 monolayer VOx, increased activity and selectivity in partial oxidation of toluene. In order to elucidate the nature of vanadia species formed on the surface of V/Ti-oxide upon potassium doping, the catalysts were studied by transient kinetics method. The transient product responses during toluene oxidation by the oxygen present in the catalyst were compared for K-doped and non-doped samples. The formation of CO2 decreased and formation of benzaldehyde increased with addition of potassium. This suggests a lower surface concentration of electrophilic oxygen (O−, O2−), which is usually responsible for the deep oxidation, and a higher concentration of nucleophilic oxygen (O2−), responsible for the partial oxidation. The catalysts were characterised by means of HRTEM, FT-Raman spectroscopy and 51V NMR. Potassium addition introduces a disorder in the crystalline structure of bulk V2O5 particles resulting in better spreading of V2O5 over TiO2 surface. The interaction of V2O5 with TiO2 was facilitated upon K-doping, leading to the increased formation of monomeric vanadia species, which are the active sites in toluene partial oxidation to benzaldehyde.

Cite: Bulushev D.A. , Kiwi-Minsker L. , Zaikovskii V.I. , Lapina O.B. , Ivanov A.A. , Reshetnikov S.I. , Renken A.
Effect of Potassium Doping on the Structural and Catalytic Properties of V/Ti-oxide in Selective Toluene Oxidation
Applied Catalysis A: General. 2000. V.202. N2. P.243-250. DOI: 10.1016/S0926-860X(00)00538-X WOS Scopus РИНЦ ANCAN OpenAlex

Files: Full text from publisher

Dates:

Published online:	Jun 28, 2000
Published print:	Aug 14, 2000

Identifiers:

Web of science:	WOS:000088045800011
Scopus:	2-s2.0-0343777363
Elibrary:	13357172
Chemical Abstracts:	2000:433130
Chemical Abstracts (print):	133:155954
OpenAlex:	W2043414227

Citing:

DB	Citing
Web of science	47
Scopus	53
Elibrary	52
OpenAlex	45

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