We conducted a comparative study of gas phase dehydration of glycerol to acrolein over aluminium phosphate, iron phosphate and nickel phosphate catalysts prepared by a simple replacement reaction method (AlP, FeP and NiP). The textural properties, acid amounts, acid types, and coke contents of the samples were studied. The results showed that all metal phosphate catalysts remained in an amorphous state. The glycerol conversion was proportional to the acid amount of metal phosphate catalyst in the glycerol dehydration reaction. Higher value of B/L was more likely to produce acrolein. Among the metal phosphate catalysts, FeP showed superior performance due to its suitable textural and acid properties. After 2 h on stream, high glycerol conversion (96%), acrolein selectivity (82%) and acrolein yield (79%) were achieved on the FeP catalyst at 280 °C. The catalyst deactivation was ascribed to carbon deposition on the catalyst surface blocking the active sites during the glycerol dehydration reaction.

中文翻译：

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不同金属磷酸盐催化剂上甘油气相脱水制丙烯醛

我们对通过简单置换反应法（AlP、FeP 和 NiP）制备的磷酸铝、磷酸铁和磷酸镍催化剂进行了甘油气相脱水生成丙烯醛的比较研究。研究了样品的质地特性、酸量、酸类型和焦炭含量。结果表明，所有金属磷酸盐催化剂均保持无定形状态。甘油转化率与甘油脱水反应中金属磷酸盐催化剂的酸量成正比。B/L 值越高，产生丙烯醛的可能性就越大。在金属磷酸盐催化剂中，FeP由于其合适的质地和酸性性能表现出优异的性能。运行 2 小时后，FeP 催化剂在 280 °C 下实现了高甘油转化率 (96%)、丙烯醛选择性 (82%) 和丙烯醛产率 (79%)。