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oa South African Journal of Chemistry - Partial oxidation of -pentane over vanadium phosphorus oxide supported on hydroxyapatites : research article

 

Abstract

The selective oxidation of -pentane to value-added products, maleic anhydride or phthallic anhydride by vanadium phosphorus oxide loaded on hydroxyapatites as catalysts and oxygen as oxidant was investigated. Hydroxyapatite (HAp) and cobalt-hydroxyapatite (Co-HAp) were prepared by the co-precipitation method and VPO with varying weight percentages (2.5-15.0 %) were loaded on the hydroxyapatite supports by the wet impregnation technique. The catalyst materials were characterized by surface area measurements, elemental analysis, powder X-ray diffraction (XRD), infrared spectroscopy (IR) and temperature- programmed reduction (TPR). VPO is present in two phases, . (VO)PO and VOPO. With increase in the VPO loading on the hydroxyapatites, the (VO)PO phase also increased. From catalytic results, a conversion of 75 % of -pentane and selectivity towards maleic anhydride, about 50 % and phthalic anhydride, about 25 %, were consistently achieved with loadings of 5.0 and 7.5 wt. % VPO at 360 °C for GHSVs of 1900 and 2300 h-1. Under optimum conditions, product yields of up to 40 % maleic anhydride and 20 % phthalic anhydride were obtained. It is proposed that the products formed through the diene intermediate.

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/content/chem/69/1/EJC182888
2016-01-01
2016-12-09
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