Multifunctionality of Crystalline MoV(TeNb) M1 Oxide Catalysts in Selective Oxidation of Propane and Benzyl Alcohol
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- 作者：Kazuhiko Amakawa ; Yury V. Kolen鈥檏o ; Alberto Villa ; Manfred E/ Schuster ; L茅n谩rd-Istv谩n Csepei ; Gisela Weinberg ; Sabine Wrabetz ; Raoul Naumann d鈥橝lnoncourt ; Frank Girgsdies ; Laura Prati ; Robert Schl枚gl ; Annette Trunschke
- 刊名：ACS Catalysis
- 出版年：2013
- 出版时间：June 7, 2013
- 年：2013
- 卷：3
- 期：6
- 页码：1103-1113
- 全文大小：618K
- 年卷期：v.3,no.6(June 7, 2013)
- ISSN：2155-5435
文摘
Propane oxidation at 653鈥?73 K and benzyl alcohol oxidation at 393 K over phase-pure MoV(TeNb) M1 oxide catalysts were studied to gain insight into the multiple catalytic functions of the surface of the M1 structure. Electron microscopy and X-ray diffraction confirmed the phase purity of the M1 catalysts. Propane oxidation yields acrylic acid via propene as intermediate, while benzyl alcohol oxidation gives benzaldehyde, benzoic acid, benzyl benzoate, and toluene. The consumption rates of benzyl alcohol and propane level in the same range despite huge difference in reaction temperature, suggesting high activity of M1 for alcohol oxidation. Metal鈥搊xygen sites on the M1 surface are responsible for the conversion of the two reactants. However, different types of active sites and reaction mechanisms may be involved. Omitting Te and Nb from the M1 framework eliminates acrylic acid selectivity in propane oxidation, while the product distribution in benzyl alcohol oxidation remains unchanged. The results suggest that the surface of M1 possesses several types of active sites that likely perform a complex interplay under the harsh propane oxidation condition. Possible reaction pathways and mechanisms are discussed.