MCF SUPPORTED V-Mo-Nb CATALYSTS PREPARED BY DIRECT HYDROTHERMAL SYNTHESIS AND IMPREGNATION METHODS FOR OXIDATIVE DEHYDROGENATION OF PROPANE


YAŞYERLİ S. , Aktas O.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.27, no.1, pp.49-58, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 1
  • Publication Date: 2012
  • Title of Journal : JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Page Numbers: pp.49-58

Abstract

Vanadium (V), molybdenum (Mo) and niobium (Nb) incorporated MCF ("Mesocellular Silica Foams") supported catalysts were prepared by direct hydrothermal (V-Mo-Nb-MCF) and impregnation (V-MoNb@MCF) methods for oxidative dehydrogenation of propane (ODHP) to produce propylene. Also, different amounts of V (V/Si mole ratios: 0.031, 0.062, 0.124) incorporated MCF supported V-MCF catalysts were synthesized by direct hydrothermal method and tested for ODHP reaction. The XRD patterns of V-MCF and V-Mo-Nb-MCF catalysts showed that there was no peak corresponding to V, Mo and Nb metals at high 2 theta region. MoO3 peak was observed in the XRD pattern of V-Mo-Nb@MCF catalyst prepared by the impregnation method. BET surface areas of the catalysts synthesized by hydrothermal method (664-996 m(2)/g) were found to be higher than the surface area of the catalyst prepared by impregnation method (270 m(2)/g). Using Mo and Nb metals together with V in the V-Mo-Nb@MCF catalyst prepared by impregnation increased propane conversion (up to 12%) and decreased propylene selectivity on ODHP catalytic test studies (550 degrees C; O-2/C3H8/He:3/6/21) in the fixed bed reactor system. The propane conversion value of V-Mo-Nb-MCF catalysts synthesized by hydrothermal route was low while the propylene selectivity (81%) of this catalyst was found to be significantly high.