The generally accepted three-step mechanism of propene oxidation to acrolein includes abstraction of two hydrogen atoms and addition of one oxygen atom. The first step is a well-known H-abstraction from the methyl group. The sequence of two other steps is unclear. We investigated the reaction in quasi-catalytic mode at 100–200 °C with extraction and analysis of accumulated surface products. The reaction intermediate, surface ether of allyl alcohol, was identified. This strongly proves that O-addition precedes the second H-abstraction. Activation energy and kinetic isotope effect of the quasi-catalytic reaction correlate with appropriate parameters of the conventional catalytic process.

中文翻译：

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多组分Bi-Mo催化剂上丙烯氧化为丙烯醛中中间体的准催化鉴定

丙烯氧化为丙烯醛的普遍接受的三步机理包括两个氢原子的提取和一个氧原子的添加。第一步是众所周知的从甲基中提取H。其他两个步骤的顺序尚不清楚。我们在100-200°C下以准催化模式研究了反应，并提取并分析了累积的表面产物。鉴定了反应中间体烯丙醇的表面醚。这有力地证明了O加法在第二次H提取之前。准催化反应的活化能和动力学同位素效应与常规催化过程的适当参数相关。