Zhong Shunhe, Wang Xitao, Geng Yunfeng. Study on the V-P-O/ SiO2 Catalyst in the Partial Oxidation of Iso-butane[J]. Chinese Journal of Chemical Physics , 2004, 17(1): 91-94. doi: 10.1088/1674-0068/17/1/91-94
Citation: Zhong Shunhe, Wang Xitao, Geng Yunfeng. Study on the V-P-O/ SiO2 Catalyst in the Partial Oxidation of Iso-butane[J]. Chinese Journal of Chemical Physics , 2004, 17(1): 91-94. doi: 10.1088/1674-0068/17/1/91-94

Study on the V-P-O/ SiO2 Catalyst in the Partial Oxidation of Iso-butane

doi: 10.1088/1674-0068/17/1/91-94
Funds:  Project supported by the National Natural Science Foundation of China(29773031)and National Key Basic Research of China(2001CCA03600).
  • Received Date: 2002-12-02
  • The V2O5/SiO2 and V2O5-P2O5/SiO2 catalysts were prepared by the Sol-gel method. The surface composition,structure,chemisorption and reactivity of the catalysts were systematically studied by using the techniques of XRD,TPR,IR,TPD and icro-reactor. The results showed that the active component was dispersed uniformly on the surface of amorphous SiO2 . There existed Lewis base sites(V=O and V-O-V)and Lewis acid sites (Vn+)on the surface of these catalysts. An addition of PO43- could lower the activity of surface terminal oxygen of Lewis base sites V=O. Iso-butane could chemisorbed on surface terminal oxygen of Lewis base sites V=O by one or two H atoms in -CH3 to form molecular adsorption states. Reaction products of i-C4H10 on the V-P-O/SiO2 catalyst were mainly i-C4H8,MAL,MAA and COx . Conversion of i-C4H10 was 5% and selectivity of partial oxidation products is above 72% at 300℃. The addition of PO43- could improve the selectivity of partial oxidation products on the VSiO catalyst because PO43- could reduce the activity of lattice oxygen in V = O bond,and weaken the adsorption intensity of i-C4H10 .
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Study on the V-P-O/ SiO2 Catalyst in the Partial Oxidation of Iso-butane

doi: 10.1088/1674-0068/17/1/91-94
Funds:  Project supported by the National Natural Science Foundation of China(29773031)and National Key Basic Research of China(2001CCA03600).

Abstract: The V2O5/SiO2 and V2O5-P2O5/SiO2 catalysts were prepared by the Sol-gel method. The surface composition,structure,chemisorption and reactivity of the catalysts were systematically studied by using the techniques of XRD,TPR,IR,TPD and icro-reactor. The results showed that the active component was dispersed uniformly on the surface of amorphous SiO2 . There existed Lewis base sites(V=O and V-O-V)and Lewis acid sites (Vn+)on the surface of these catalysts. An addition of PO43- could lower the activity of surface terminal oxygen of Lewis base sites V=O. Iso-butane could chemisorbed on surface terminal oxygen of Lewis base sites V=O by one or two H atoms in -CH3 to form molecular adsorption states. Reaction products of i-C4H10 on the V-P-O/SiO2 catalyst were mainly i-C4H8,MAL,MAA and COx . Conversion of i-C4H10 was 5% and selectivity of partial oxidation products is above 72% at 300℃. The addition of PO43- could improve the selectivity of partial oxidation products on the VSiO catalyst because PO43- could reduce the activity of lattice oxygen in V = O bond,and weaken the adsorption intensity of i-C4H10 .

Zhong Shunhe, Wang Xitao, Geng Yunfeng. Study on the V-P-O/ SiO2 Catalyst in the Partial Oxidation of Iso-butane[J]. Chinese Journal of Chemical Physics , 2004, 17(1): 91-94. doi: 10.1088/1674-0068/17/1/91-94
Citation: Zhong Shunhe, Wang Xitao, Geng Yunfeng. Study on the V-P-O/ SiO2 Catalyst in the Partial Oxidation of Iso-butane[J]. Chinese Journal of Chemical Physics , 2004, 17(1): 91-94. doi: 10.1088/1674-0068/17/1/91-94

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