Catalytic properties of nitrided V/Al/O-mixed oxides in the ammoxidation of propane and new efficient preparation method for the catalysts

Catalytic properties of nitrided V/Al/O-mixed oxides in the ammoxidation of propane and new efficient preparation method for the catalysts
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氮化V/Al/O混合氧化物在丙烷氨氧化反应中的催化性能及其新型高效制备方法

DOI:
10.1016/j.cattod.2011.12.023
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发表时间:
--
期刊:
影响因子:
5.3
通讯作者:
J.-M. Millet
J.-M. Millet
中科院分区:
化学2区
文献类型:
--
作者:
J. Bilde;C. Janke;S. Loridant;A. Brückner;J.-M. Millet

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制备了V/Al/O氧化物催化剂,并在500°C下将其用作丙烷氨氧化为丙烯腈的催化剂。这些催化剂的高效率,这是部分氮化催化反应条件下,得到证实。最好的催化剂,其特征在于V/Al比约0.30,在58%的转化率下,丙烯腈的选择性为51%。在低转化率下的测试表明,丙烯是丙烷氨氧化的主要初级产物,并且这些催化剂上的反应途径与其他高效催化体系上的反应途径相似。研究了以草酸铝钒混合铵为原料低温分解合成草酸铝钒混合铵的新方法。它导致高活性催化剂,其显示出对丙烯腈的选择性增加。活性和选择性的增加归因于钒的更好的分散,其中在本体中和可能在催化剂的表面处具有更高浓度的孤立的钒物种。
V/Al/O oxides have been prepared and tested as catalysts for the ammoxidation of propane into acrilonitrile at 500°C. The high efficiency of these catalysts, which were partially nitrided under catalytic reaction conditions, is confirmed. The best catalysts characterized by a V/Al ratio around 0.30, exhibited selectivity to acrilonitrile of 51% at 58% conversion. Testing at low conversion showed that propene was the main primary product from propane ammoxidation and that the reaction pathway on these catalysts was similar to that on other efficient catalytic systems. A new method of synthesis based upon the decomposition at low temperature of a mixed ammonium aluminum–vanadium oxalate was developed. It leads to highly active catalysts, which displayed increased selectivity to acrylonitrile. The gain in activity and selectivity was attributed to a better dispersion of vanadium with a higher concentration of isolated vanadium species in the bulk and presumably at the surface of the catalysts.
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