Improvement of promoted vanadyl phosphate catalyst properties in n-butane oxidation to maleic anhydride by barothermal and mechanochemical treatment

V. A. Zazhigalov, I. V. Bacherikova, V. E. Yaremenko, I. Ayub, D. Su, M. Willinger, A. Kharlamov, L. Ushkalov, R. Schlögl

Research output: Contribution to journalArticlepeer-review

Abstract

The possibility to increase the selectivity and yield to MA in n-butane partial oxidation was studied experimentally by focusing on the VPO catalyst. The barothermal treatment of VPO catalyst by phosphorus-containing compounds increased the activity and selectivity of the catalyst. Catalyst activity and selectivity were stable. The mechanochemical treatment of VPBiO catalyst enhanced n-butane conversion and improved the selectivity to MA but the specific rate oxidation remained practically constant. The results thus demonstrated that barothermal and mechanochemical treatment of traditionally prepared VPO precursor can effectively increase the activity and selectivity of the VPO catalyst in n-butane partial oxidation. The yield of MA in n-butane oxidation became as high as 61-64 mole %. The catalytic properties were enhanced by active cluster formation owing to surplus phosphorus introduction to the catalyst surface or to the creation of an amorphous zone around active groups. The modified catalyst retained high efficiency for a long time on stream. The experiments are discussed in detail, n-Butane partial oxidation to maleic anhydride (MA) on Vanadium-phosphorus oxide (VPO) catalyst was the first industrially successful light paraffin oxidation. Over 20 yr ago VPO catalysts gave yields of MA from n-butane of 53-55 mole %. This was advantageous compared with benzene oxidation to MA.

Original languageEnglish
Pages (from-to)257-264
Number of pages8
JournalDGMK Tagungsbericht
Issue number3
StatePublished - 2004
Externally publishedYes

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