Abstract

This study investigated the effects of reaction conditions in a one-step gas-phase synthesis of butadiene from formaldehyde and propylene over a SiO₂-supported silicotungstic heteropoly acid catalyst. The physicochemical properties of the catalyst were examined by X-ray fluorescence spectroscopy, low-temperature nitrogen adsorption, XRD, SEM, and NH₃–TPD. It was found that, with increase in reaction temperature, the yield of butadiene passes through its maximum. Increasing the WHSV of the reactant feed lowers the formaldehyde conversion and enhances the butadiene selectivity. Raising the propylene to formaldehyde molar ratio increases the formaldehyde conversion, with the butadiene selectivity passing through its maximum. Finally, diluting the reactants with an inert gas barely affects the process performance.

中文翻译：

---

反应条件对甲醛和丙烯合成丁二烯的影响

摘要

_{本研究研究了反应条件对在 SiO 2}负载的硅钨杂多酸催化剂上由甲醛和丙烯一步气相合成丁二烯的影响。采用X射线荧光光谱、低温氮吸附、XRD、SEM、NH _{3等方法对催化剂的理化性质进行了检测。}-TPD。研究发现，随着反应温度的升高，丁二烯的收率达到最大值。增加反应物进料的 WHSV 会降低甲醛转化率并提高丁二烯的选择性。提高丙烯与甲醛的摩尔比会增加甲醛的转化率，丁二烯的选择性超过其最大值。最后，用惰性气体稀释反应物几乎不会影响工艺性能。