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
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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
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发表时间:
2010
期刊:
影响因子:
4.5
通讯作者:
Al Otaibi R
中科院分区:
文献类型:
--
作者:
Al Otaibi R
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.
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DOI:
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发表时间:
1994
期刊:
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