羟基新戊醛加氢制新戊二醇催化剂及工艺研究

Study on Catalyst and Process of Catalytic Hydrogenation for 3-Hydroxy-2,2-dimethylpropanal to Neopentyl Glycol

摘要:

介绍了一种新型的负载型铜基催化剂，用于催化羟基新戊醛(HPA)低压下加氢合成新戊二醇(NPG)，并在固定床连续反应装置上研究了不同助剂及反应条件对催化剂性能的影响。采用均匀沉淀法制备了四种助剂(Co、Mn、Ni、Zn)修饰的Cu/SiO2催化剂，其中Co修饰的Cu/SiO2催化剂，在压力0.10~0.62 Mpa、反应温度90℃、HPA质量分数11.24%、n(H2):n(HPA)=4：1和液时空速1.4 h-1的条件下，羟基新戊醛转化率大于99.0%，新戊二醇选择性接近100%。利用XRD、BET和TG表征了不同助剂修饰前后催化剂的物化特性。结果表明：经Co修饰后的催化剂并没有改变CuO的晶相结构，而且阻止了CuO晶粒生长，同时增强了活性组分和载体之间的相互作用。

Abstract:

The catalytic performances of 3-Hydroxy-2,2-dimethylpropanal hydrogenation to neopentyl glycol over Cu/SiO2 catalysts were tested in a fixed-bed plug flow reactor. A new type of Cu/SiO2 catalysts modified by four different promoters (Zn, Ni, Mn, Co) were prepared by homogeneous precipitation method. The results showed that the addition of Co promoter on Cu/SiO2 catalysts could promote dispersion of the active component efficiently and stabilize the active center of the catalysts. Evaluation test on activity of the catalysts showed that HPA conversion greater than 99.6% and selectivity to neopentyl glycol about 100% could be obtained under 0.10~0.62 Mpa pressure, temperature of 90℃, mass fraction of HPA at 11.24%, liquid hourly space velocity of 1.4 h-1 and H2/HPA molar ratio of 4 to 1. The unmodified catalyst and the newly prepared ones were characterized by XRD, BET and TG analysis. XRD characterization showed that Co promoter was favorable for the dispersion of CuO, and enhanced the interaction between active component and carrier. Therefore the catalytic activity of the modified catalysts was obviously higher than the original.