- The heterogeneously catalyzed selective gas phase oxidation of o-xylene was investigated, using a
microstructured fixed bed reactor, inside of the explosion regime. The reaction was carried out with high
amounts of o-xylene in air and stoichiometric with oxygen using a V2O5/TiO2-catalyst prepared through
grafting. There were no significant losses in the selectivity to phthalic anhydride observable, during the
measurements in the explosion regime, with feed compositions of up to 7 vol% o-xylene. Also the
space-time yield was up to 2.3 times higher in comparison to conventional reaction conditions. An
increase of the selectivity to total oxidation products was observed at higher o-xylene concentrations
between 10 and 25 vol% o-xylene, which possibly was caused by the formation of a hotspot. The
investigation of the used catalyst revealed a thermally induced deactivation due to phase transition of
anatase into rutil and formation of crystalline vanadium oxide. Despite that expectedThe heterogeneously catalyzed selective gas phase oxidation of o-xylene was investigated, using a
microstructured fixed bed reactor, inside of the explosion regime. The reaction was carried out with high
amounts of o-xylene in air and stoichiometric with oxygen using a V2O5/TiO2-catalyst prepared through
grafting. There were no significant losses in the selectivity to phthalic anhydride observable, during the
measurements in the explosion regime, with feed compositions of up to 7 vol% o-xylene. Also the
space-time yield was up to 2.3 times higher in comparison to conventional reaction conditions. An
increase of the selectivity to total oxidation products was observed at higher o-xylene concentrations
between 10 and 25 vol% o-xylene, which possibly was caused by the formation of a hotspot. The
investigation of the used catalyst revealed a thermally induced deactivation due to phase transition of
anatase into rutil and formation of crystalline vanadium oxide. Despite that expected hotspot at high oxylene
concentrations, there was no ignition or explosion of the gas mixture observable.…
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