Partial Oxidation of Isobutane and Isobutene to Methacrolein Over a Novel Mo–V–Nb(–Te) Mixed Oxide Catalyst
Partial Oxidation of Isobutane and Isobutene to Methacrolein Over a Novel Mo–V–Nb(–Te) Mixed Oxide Catalyst
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DOI：
10.1007/s11244-017-0830-0
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发表时间：
2017-06
影响因子：
3.6
通讯作者：
D. Weber;P. Weidler;B. Kraushaar-Czarnetzki
中科院分区：
文献类型：
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作者：
D. Weber;P. Weidler;B. Kraushaar-Czarnetzki
为了提高异丁烷和异丁烯氧化制甲基丙烯醛和甲基丙烯酸的催化性能，合成了一种新型MoVNb（Te）复合氧化物催化剂。Rietveld分析表明，该晶体结构与已知的用于C3烃的（氨-）氧化的MoVTeNb混合氧化物催化剂很好地区分开。在异丁烷的转化反应中，催化剂的活性和甲基丙烯醛和甲基丙烯酸的选择性都很低，异丁烷脱氢制异丁烯是反应的速率控制过程。然而，该新型催化剂非常适合于异丁烯的部分氧化。虽然对甲基丙烯醛的选择性与其他催化剂的报道相当，但活性上级，导致在高达420 °C的温度下具有非常高的时空产率。该新型混合氧化物是Mars货车Krevelen型催化剂。进料中需要过量的氧气以确保最佳性能。
Aiming at a catalyst with improved catalytic properties in the oxidation of isobutane and isobutene to methacrolein and methacrylic acid, a novel MoVNb(Te) mixed oxide catalyst was synthesized. Rietveld analysis revealed that the crystal structure is well distinguishable from the known MoVTeNb mixed oxide catalyst used in the (amm-)oxidation of C3hydrocarbons. In the conversion of isobutane, activity as well as selectivities to methacrolein and methacrylic acid were low, and the dehydrogenation of isobutane to isobutene was found to be rate determining. However, the novel catalyst is highly suitable for the partial oxidation of isobutene. While selectivity to methacrolein is comparable to that reported for other catalysts, the activity is superior, resulting in very high space-time-yields at temperatures up to 420 °C. The novel mixed oxide is a Mars van Krevelen-type catalyst. Excess oxygen in the feed is required to ensure optimum performance.