Effect of Potassium Doping on the Structural and Catalytic Properties of V/Ti-oxide in Selective Toluene Oxidation | Sciact - CRIS-система Института катализа

Effect of Potassium Doping on the Structural and Catalytic Properties of V/Ti-oxide in Selective Toluene Oxidation Научная публикация

Журнал

Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875

Вых. Данные

Год: 2000, Том: 202, Номер: 2, Страницы: 243-250 Страниц : 8 DOI: 10.1016/S0926-860X(00)00538-X

Ключевые слова

V/Ti-oxide catalysts; Doping by potassium; Toluene partial oxidation; Transient response technique; FT-Raman spectroscopy; HRTEM51V NMR

Авторы

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

Организации

1	Institute of Chemical Engineering, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland
2	Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia

Информация о финансировании (2)

1	European Commission
2	Swiss National Science Foundation

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.

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 CAPlusCA OpenAlex

Полный текст от издателя

Опубликована online:	28 июн. 2000 г.
Опубликована в печати:	14 авг. 2000 г.

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

БД	Цитирований
Web of science	48
Scopus	54
РИНЦ	55
OpenAlex	47