Abstract We report on the catalytic dehydration of 3-hydroxybutanone to butenone (but-3-en-2-one or methyl vinyl ketone), which could become a key step in a new bio-based process for the production of vitamin A. The gas-phase dehydration reaction has been studied with various trivalent orthophosphates under atmospheric pressure, at temperatures ranging between 250 and 350 °C. Although FePO4, CePO4, YPO4 and BPO4 are found to be either poorly active, or poorly selective to butanone, the other rare-earth phosphates tested in this study allowed higher butanone yields to be obtained than has been previously reported. We show that the catalytic properties of these compounds depend on the nature of the rare-earth element. The most promising results are obtained with LaPO4, which is characterized by a 93% selectivity to butenone at 92% conversion. The catalytic activity and selectivity of the most efficient catalysts are discussed in terms of their surface acidity and basicity.

中文翻译：

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3-羟基丁酮在正磷酸盐催化剂上气相脱水，用于生物基生产丁烯酮，从而实现维生素 A 的可持续工业路线

摘要 我们报告了 3-羟基丁酮催化脱水为丁烯酮（but-3-en-2-one 或甲基乙烯基酮），这可能成为生产维生素 A 的新生物基工艺的关键步骤。在大气压下，在 250 至 350 °C 的温度范围内，研究了各种三价正磷酸盐的气相脱水反应。尽管发现 FePO4、CePO4、YPO4 和 BPO4 要么活性较差，要么对丁酮的选择性较差，但本研究中测试的其他稀土磷酸盐允许获得比以前报道的更高的丁酮产量。我们表明这些化合物的催化性能取决于稀土元素的性质。最有希望的结果是使用 LaPO4 获得的，其特征是在 92% 的转化率下对丁烯酮的选择性为 93%。