Zn改性Cu/SiO2催化十二醇无氧脱氢制十二醛的研究
曹珊珊 , 周维友 , 田正 , 吴中 , 孙中华 , 钱俊峰 , 何明阳
现代化工 ›› 2025, Vol. 45 ›› Issue (3) : 125 -130.
Zn改性Cu/SiO2催化十二醇无氧脱氢制十二醛的研究
Study on dehydrogenation of dodecanol to dodecanal over Zn-modified Cu/SiO2 catalyst
采用共沉淀法制备了系列金属改性M-Cu/SiO2(M为Zn、Fe、Co或Cr)催化剂,通过BET、XRD、H2-TPR、NH3-TPD、XPS等对催化剂进行表征,并在十二醇无氧脱氢反应中研究其催化性能。结果表明,Zn改性可提升Cu物种在SiO2载体表面的分散性和还原性及其在脱氢反应中的催化性能。适当的Cu+/Cu0比有利于提高催化剂的催化性能,弱酸性位的增加会导致副产物十二烯的生成。将Zn-Cu/SiO2催化剂应用于十二醇无氧脱氢制备十二醛的反应中,在最优条件下,十二醇的转化率为91.4%,选择性为97.7%。连续运行200 h后,Zn-Cu/SiO2催化剂的催化性能基本保持稳定,表明其在脱氢过程中具有良好的稳定性和应用潜力。
A series of metal-modified M-Cu/SiO2 (M=Zn,Fe,Co or Cr) catalysts are prepared via coprecipitation method,and systematically characterized by means of BET,XRD,H2-TPR,NH3-TPD and XPS.Their catalytic performance is studied in the anaerobic dehydrogenation of dodecanol.Results show that Zn modification can improve the dispersion performance and reduction activation of Cu species on the surface of SiO2 carrier,as well as their catalytic performance in the dehydrogenation reaction.An appropriate Cu+/Cu0 ratio is beneficial to the catalytic performance of the catalyst,and the increase of the weak acid sites on the catalyst leads to the formation of the by-product dodecene.As Zn-Cu/SiO2 is applied in the anaerobic dehydrogenation of dodecanol to produce dedecanal under the optimal conditions,the conversion of dodecanol reaches 91.4% with a selectivity of 97.7%.Moreover,Zn-Cu/SiO2 has kept almost steady catalytic performance after 200 hours of operation,indicating its good stability and application potential in the dehydrogenation process.
十二醇 / Zn改性 / Cu催化剂 / 无氧脱氢 / 十二醛
dodecanol / Zn modification / Cu catalyst / anaerobic dehydrogenation / dodecanal
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江苏省绿色催化材料与技术重点实验室基金(BM2012110)
江苏省高等学校自然科学研究重大项目(20KJA530003)
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