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Effect of Potassium Doping on the Structural and Catalytic Properties of V/Ti-oxide in sSelective Toluene Oxidation Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875
Output data Year: 2000, Volume: 202, Number: 2, Pages: 243-250 Pages count : 8 DOI: 10.1016/S0926-860X(00)00538-X
Tags V/Ti-oxide catalysts; Doping by potassium; Toluene partial oxidation; Transient response technique; FT-Raman spectroscopy; HRTEM51V NMR
Authors Bulushev Dmitri A. 1 , Kiwi-Minsker Lioubov 1 , Zaikovskii Vladimir I. 2 , Lapina Olga B. 2 , Ivanov Alexei A. 2 , Reshetnikov Sergei I. 2 , Renken Albert 1
Affiliations
1 Institute of Chemical Engineering, Swiss Federal Institute of Technology
2 Boreskov Institute of Catalysis

Funding (2)

1 European Commission
2 Swiss National Science Foundation

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 sSelective Toluene Oxidation
Applied Catalysis A: General. 2000. V.202. N2. P.243-250. DOI: 10.1016/S0926-860X(00)00538-X publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Files: Full text from publisher
Dates:
Published online: Jun 28, 2000
Published print: Aug 14, 2000
Identifiers:
publication_identifier.wos_identifier_type WOS:000088045800011
publication_identifier.scopus_identifier_type 2-s2.0-0343777363
publication_identifier.rinz_identifier_type 13357172
publication_identifier.accession_number_identifier_type 2000:433130
publication_identifier.chemical_accession_number_identifier_type 133:155954
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