3-甲基-2-丁烯醛液相加氢反应  

Liquid-phase hydrogenation of 3-methylcrotonaldehyder

作　　者：邓寒霜 李筱玲 Deng Hanshuang;Li Xiaoling(College of Biopharmaceutical Engineering and Food Science,Shangluo University,Shangluo Shaanxi 726000,China)

机构地区：[1]商洛学院生物医药与食品工程学院,陕西商洛726000

出　　处：《石油化工》2020年第12期1169-1174,共6页Petrochemical Technology

摘　　要：采用NaOH溶液处理活性炭(AC)载体,负载Pt后制备了Pt/AC催化剂,对催化剂进行了N_2吸附-脱附、FTIR、TPT-MS、TEM和H_2-TPR表征,测定了催化剂的金属分散度;并将Pt/AC催化剂用于3-甲基-2-丁烯醛加氢反应,考察了NaOH处理对催化剂性能的影响。实验结果表明,NaOH处理使AC载体的比表面积略有降低,孔径增大,表面羧酸含氧基团数量增加,活性Pt金属纳米颗粒的分散度增大,粒子尺寸减小。催化剂的反应性能与表面金属粒子分散度相关,考虑原料中甲基的空间位阻效应,当Pt纳米粒子尺寸达到3~5 nm时,催化剂活性较高,C=O键优先于C=C键加氢,不饱和醇选择性较高。经8%(w)NaOH溶液处理的AC载体制备的Pt/AC-8催化剂的Pt纳米粒子尺寸为2~5 nm,3-甲基-2-丁烯醛转化率达99.54%、3-甲基-2-丁烯醇选择性为96.06%。The activated carbon(AC)support was treated with NaOH solution,series Pt/AC catalysts were prepared and characterized by N 2 adsorption-desorption,FTIR,TPD-MS,TEM and H 2-TPR.The metal dispersion of the catalysts was measured.Pt/AC catalysts were used in the hydrogenation of 3-methyl-2-butenal,and the effect of NaOH treatment on the performance of the catalyst was investigated.The results show that NaOH treatment reduces the specific surface area of AC support slightly and increases the pore size and the surface oxygen functional groups,as well as the active Pt metal nanoparticles become smaller and uniformly dispersed in the support.The reaction performance of the catalyst is closely related to the dispersibility of the surface metal particles.Considering the steric hindrance effect of the raw material methyl group,the catalyst activity is higher and the C=O bond is hydrogenated preferentially resulting in higher selectivity of unsaturated alcohol when the Pt nanoparticles size reaches 3-5 nm.Pt/AC-8 catalyst prepared by AC treated with 8%(w)NaOH has the best Pt nanoparticles size of 2-5 nm,the 3-methyl-2-butenal conversion and 3-methyl-2-butenol selectivity are 99.54%and 96.06%respectively.

关 键 词：3-甲基-2-丁烯醛 3-甲基-2-丁烯醇 催化加氢 含氧基团 

分 类 号：TQ223.14[化学工程—有机化工]