四氢糠醇合成吡啶催化剂的制备及工艺研究

Preparation of Catalyst for Synthesizing Pyridine Using THFA as the Starting Material

研究了四氢糠醇(THFA)与氨气在固定床反应器中合成吡啶的工艺路线,对催化剂进行了考察。以Al2O3为基底,分别制备负载Co3O4、Cr2O3、MoO3的单一组分催化剂,筛选出催化性能最好的催化剂MoO3作为主催化剂,混合不同量的Co3O4、Cr2O3,制备成各种复合催化剂。确定催化剂Cr2O3-MoO3/Al2O3催化效果最佳,对其结构进行了表征,并在固定床反应器上对该催化剂催化四氢糠醇合成吡啶的工艺及稳定性进行了研究。最适宜反应条件下,即500℃,氨气流量700 mL/min,四氢糠醇进液量0.15 mL/min及常压条件进行时,四氢糠醇转化率达100%,吡啶收率达85.30%。

The synthesis of pyridine via the reaction of tetrahydrofurfuryl alcohol（THFA） with NH3 by using fixed-bed reactor was studied.Single component catalyst such as Al2O3-supported Co3O4、Cr2O3 and MoO3 were prepared and their catalytic performance for the synthesis of pyridine was investigated respectively.The study has shown that MoO3/Al2O3 gave the best result.Next,the composite catalyst,in which MoO3 was used as the main catalyst and various amounts of Co3O4 and Cr2O3 were added as the minor components,were also screened.It was found that the best result was obtained for Cr2O3-MoO3/Al2O3 whose structure was characterized.Then the process and the stability of the catalyst were investigated for the synthesis of pyridine.The best condition was determined.When the reaction was run at 500 ℃ under atmospheric pressure,the rate of flow of THFA was 0.15 mL/min and rate of flow of NH3 was 700 mL/min,the conversion of THFA and the yield of pyridine were 100% and 85.30%,respectively.