Oxydehydrogenation of propane over vanadium oxide supported on kieselguhr or MCM-41

الملخص EN

Supported vanadium oxide (5 wt %) on either Kieselguhr or mesoporous MCM-41 was prepared using impregnation method and tested as a catalyst in propane oxidative dehydrogenation (POD).

The catalyst samples were characterized using X-ray elemental analysis, Brunauer-Emmett-Teller (BET) physisorption, and Z-ray Photoelectron Spectroscopy (XPS).

After impregnation, the catalyst surface area decreased compared with that of the support.

More drastic decrease was observed in the case of MCM-41 (77 %) than the Kieselguhr supported sample (48 %).

There are also different degrees of vanadium oxide-support interaction as reflected by the XPS result.

Si-O binding energy of 531.5 eV was observed on MCM-41-supported sample compared with 529.5 eV for the Kieselguhr-supported sample.

The catalyst tests were conducted at atmospheric pressure, with a propane to oxygen ratio of 0.7-3.6 and a reaction temperature of 400-700 °C.

Oxidative dehydrogenation and combustion products were observed.

Minor cracking reaction products (methane, ethane, and ethene) were also produced above 550 ˚C.

The highest propene yield of 14 % was obtained from the Kieselguhr-supported sample at 700 ˚C and with a C3H8 / O2 ratio of 1.5.