丙酮和丁醛一步法合成甲基正戊基酮研究

Study on One-step Synthesis of Methyl Amyl Ketone from Acetone and Butyraldehyde

摘要:

以三乙胺为模板剂，采用水热法制备了Pd/SAPO-5双功能催化剂，用于丙酮和丁醛气相一步法合成甲基正戊基酮（MAK）。考察了n(SiO2):n(Al2O3)和反应温度的影响，并用H2-TPR，XRD，SEM，XRF，29Si MAS NMR等手段对催化剂进行表征。结果表明，钯的加入并不改变分子筛的晶体结构；而不同n(SiO2):n(Al2O3)会导致SAPO-5的分子筛晶体结构以及形貌上的差异。在SAPO-5的分子筛结构完整的前提下，Pd/SAPO-5催化活性随n(SiO2):n(Al2O3)的上升而增加。在最佳n(SiO2):n(Al2O3)=1.5、反应温度180℃时MAK的收率高达58.2%，并可持续运行500h以上而不失活。

Abstract:

The Pd/SAPO-5 bifunctional catalysts were prepared by hydrothermal method, with triethylamine as the template, for one-step synthesis of methyl amyl ketone (MAK) from acetone and butyraldehyde. The influences of n(SiO2):n(Al2O3) and reaction temperature were investigated, and the properties of catalysts were characterized by H2-TPR, XRD, SEM, XRF and 29Si MAS NMR. It’s proved that while the doping of Pd didn’t change the molecular sieve crystalline structure of SAPO-5, the alteration of n(SiO2):n(Al2O3) could induce the changes in crystalline structure and morphology of SAPO-5. With the SAPO-5 crystalline structure kept intact, the activity of Pd/SAPO-5 rose with the n(SiO2):n(Al2O3). For the catalyst with the best n(SiO2):n(Al2O3) of 1.5 and operated at the optimized 180 ℃, the yield of MAK can be 58.2%, which is rather stable under 500h time-on-stream test.