Vanadium Phosphate Oxide Seeds and Their Influence on the Formation of Vanadium Phosphate Catalyst Precursors

Vanadium Phosphate Oxide Seeds and Their Influence on the Formation of Vanadium Phosphate Catalyst Precursors
复制标题

磷酸钒氧化物晶种及其对磷酸钒催化剂前体形成的影响

DOI:
10.1002/cctc.200900274
复制
发表时间:
2010
期刊:
影响因子:
4.5
通讯作者:
Al Otaibi R
Al Otaibi R
中科院分区:
化学3区
文献类型:
--
作者:
Al Otaibi R

文献摘要

参考文献

被引文献

相似文献

以VOHPO4·0.5 H2O为前驱体,以(VO) 2p2o7为活性高温相的磷酸钒材料作为烷烃氧化催化剂。以1 -辛醇、3 -辛醇、2 -丁醇或2 -甲基- 1 -丙醇为溶剂和还原剂,由VOPO4⋅2 H2O制备VOHPO4⋅0.5 H2O。对于1 -辛醇,反应温度对前驱物的高产率至关重要。在160°C或更高的温度下,含有V4+离子的溶液优先形成VOHPO4⋅0.5 H2O。然而,在160℃以上,在少量磷酸钒材料存在的情况下进行还原过程,可以实现VOHPO4⋅0.5 H2O的形成,磷酸钒材料有效地起到了模板种子的作用。使用这种播种概念对最终活化催化剂的形态有显著的影响。相反,当使用3 -辛醇时,只生成VO(H2PO4)2,除非存在磷酸钒种子,其中也可以形成大量的VOHPO4⋅0.5 H2O。此外,VO(H2PO4)2可以在VOHPO4⋅0.5 H2O前体种子存在的情况下,通过乙醇回流加热转化为VOHPO4⋅0.5 H2O。研究结果表明,在制备过程中,种子的使用会影响磷酸钒的相组成和形貌。
Vanadium phosphate materials, based on a VOHPO4⋅0.5 H2O precursor and with (VO)2P2O7as an active high‐temperature phase, are used as catalysts for the oxidation of alkanes. VOHPO4⋅0.5 H2O is prepared from VOPO4⋅2 H2O using 1‐octanol, 3‐octanol, 2‐butanol, or 2‐methyl‐1‐propanol as both solvent and reducing agent. With 1‐octanol, the reaction temperature was found to be crucial in obtaining a high yield of the precursor phase. At temperatures of 160 °C or greater, a solution containing V4+ions formed in preference to VOHPO4⋅0.5 H2O. However, VOHPO4⋅0.5 H2O formation can be achieved above 160 °C by carrying out the reduction process in the presence of a small amount of vanadium phosphate material, which effectively acts as a templating seed. The use of this seeding concept is shown to have a dramatic effect on the morphology of the final activated catalyst. In contrast, when 3‐octanol is used, solely VO(H2PO4)2is generated, except in the presence of a vanadium phosphate seed where significant amounts of VOHPO4⋅0.5 H2O can also be formed. Furthermore, VO(H2PO4)2can be transformed to VOHPO4⋅0.5 H2O by heating at reflux with an alcohol in the presence of VOHPO4⋅0.5 H2O precursor seeds. The findings reported herein show that both the phase composition and morphology of vanadium phosphates can be influenced by the use of seeds during the preparation process.
DOI: --
发表时间: 1994
期刊:
影响因子: --
作者:
I. Ellison;G. Hutchings;M. T. Sananes;J. Volta
通讯作者: J. Volta
用于丁烷氧化成马来酸酐的 VPO 催化剂
DOI: --
发表时间: 1988
期刊:
影响因子: --
作者:
H. S. Horowotz;C. Blackstone;A. Sleight;G. Teufer
通讯作者: G. Teufer
“基于钒磷氧化物的催化剂的化学。注释二。制备方法的作用”
DOI: --
发表时间: 1984
期刊:
影响因子: --
作者:
G. Poli;I. Resta;O. Ruggeri;F. Trifiró
通讯作者: F. Trifiró
基于醛/酮的制备方法以VO(H2PO4)2为催化剂的正丁烷氧化
DOI: --
发表时间: 2000
期刊:
影响因子: --
作者:
J. Bartley;C. Rhodes;C. Kiely;A. Carley;G. Hutchings
通讯作者: G. Hutchings
纳米级磷酸氢氧钒半水合物微晶在正丁烷和氧气存在下活化过程中转化为焦磷酸氧钒
DOI: --
发表时间: 2008
期刊:
影响因子: --
作者:
H. Imai;Y. Kamiya;T. Okuhara
通讯作者: T. Okuhara