Performance Evaluation of V2O5/ZrO2 Catalyst for Selective Oxidation of O-xylene to Phthalic Anhydride

Document Type : Research Article

Authors

Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN

Abstract

In this work the performance of titania and zirconia supported vanadium(v) oxide catalyst in the reaction of phthalic anhydride production by selective oxidation of o-xylene was investigated. For this purpose three catalyst samples with active phase of 4, 7 and 10 wt% on a Zro2 and one sample with active phase 7 wt% on a TiO2 were prepared byimpregnationmethod.To determine the characteristics of samples, a number of experiments such as BET, XRD, SEM were done. Moreover, catalyst testingin a fixed bed reactor was carried out in the low temperature range (310-410°C) and high (450-550°C) and space velocities (1000,2000h-1) in order to evaluate activity and selectivity to phthalic anhydride. Zirconia supported catalyst with active phase of 7 wt% showed high selectivity to phthalic anhydride. Comparison between two supports shows that sample V2O5/TiO2at a temperature range 310-410°C and V2O5/ZrO2 in 450-550°C had the most selectivity to phthalic anhydride. The 48 h stability test approved that the selectivity to PA for ZrO2 supported catalyst remained approximately stable.

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References

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