n-Butane oxidation using VO(H2PO4)2 as catalyst derived from an aldehyde/ketone based preparation method

n-Butane oxidation using VO(H2PO4)2 as catalyst derived from an aldehyde/ketone based preparation method
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基于醛/酮的制备方法以VO(H2PO4)2为催化剂的正丁烷氧化

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发表时间：
2000
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影响因子：
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通讯作者：
G. Hutchings
G. Hutchings
中科院分区：
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文献类型：
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作者：
J. Bartley;C. Rhodes;C. Kiely;A. Carley;G. Hutchings

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一 详细介绍了VO（H2 PO 4）2原位活化磷酸钒催化剂上正丁烷氧化反应的研究。介绍了VO（H2 PO 4）2的新制备方法 利用V2 O 5与H3 PO 4或VOPO 4的反应， ·2 H2O与醛或酮作为还原剂。它 提出了醛和酮的烯醇形式作为还原剂。VO（H2 PO 4）2还可以 通过还原VOPO 4 与醇类相。以VO（H2 PO 4）2为原料， 活化在1.5%丁烷在空气中在400°C下72小时，很大程度上是无序的， X射线衍射和激光拉曼光谱，被证明是主要由无序的材料含有一些未转化的VO（H2 PO 4）2，VOPO 4相和可能的一些VO（PO 3）2。催化剂衍生 从所有形式的VO（H2 PO 4）2调查发现，表现出马来酸酐的选择性， 范围为20-30%，并得出结论 的 低选择性是由于 VOPO 4相的存在下，在活化的催化剂。
A detailed study of n-butane oxidation over vanadium phosphate catalysts derived from in situ activation of VO(H2PO4)2 is described and discussed. New methods of preparation of VO(H2PO4)2 are described using the reaction of V2O5 and H3PO4 or VOPO4 ·2H2O with an aldehyde or ketone as a reducing agent. It is proposed that the enol form of the aldehyde and ketone act as the reducing agent. VO(H2PO4)2 can also be obtained by reduction of VOPO4 phases with alcohols. The catalysts derived from VO(H2PO4)2 by in situ activation in 1.5% butane in air at 400°C for 72 h are largely disordered and, by detailed powder X-ray diffraction and laser Raman spectroscopy, are shown to be comprised mainly of disordered material containing some untransformed VO(H2PO4)2, VOPO4 phases and possibly some VO(PO3)2. The catalysts derived from all the forms of VO(H2PO4)2 investigated are found to exhibit maleic anhydride selectivities in the range 20–30% and it is concluded that the low selectivity is due to the presence of VOPO4 phases in the activated catalysts.