沉淀剂对体相加氢催化剂物化性质和活性的影响

分别选用NH3·H2O,NaOH,Na2CO3以及不同配比NaOH和Na2CO3混合液作为沉淀剂制备一系列体相催化剂;采用X射线衍射、N2吸附-脱附、扫描电镜、透射电镜、电子探针等表征方法和小型加氢装置评价手段,考察不同沉淀剂和不同沉淀剂配比对体相加氢催化剂物化性质和活性的影响.结果 表明:采用单独一种沉淀剂时,由Na...

EFFECT OF DIFFERENT PRECIPITATING AGENTS ON PHYSIC-CHEMICAL PROPERTIES AND ACTIVITY OF BULK HYDROGENATION CATALYSTS

A series of bulk catalysts were synthesized by using NH3.H₂O, NaOH, Na₂CO₃ and mixtures with different ratios of NaOH and Na₂CO₃ as precipitating agents. Characterization methods such as XRD, BET, TEM, SEM and EPMA are used to analyze the microscopic morphology, pore structure, crushing strength and phase of the synthesized catalysts, and a series of bulk catalysts are evaluated for hydrodesulfurization activity on a small hydrogenation unit. The results show that when a single precipitating agent is used, the bulk catalyst synthesized with NaOH has the best crushing strength and pore structure, the active metal is evenly dispersed, and its hydrodesulfurization activity is the highest. The mixed precipitating agent of NaOH and Na₂CO₃can expand the pores of the bulk catalyst, which can improve the performance of the catalyst. When the mixed precipitating agent is m(Na₂CO₃): m(NaOH)=2:3, the catalyst has the best physical and chemical properties and activity, the specific surface area of the catalyst is 213 m²/g, the pore volume is 0.308 cm³/g, the bulk density is 1.01 g/cm³, and the crushing strength is 14.9 N/mm. The relative desulfurization activity of the bulk catalyst at this ratio is 1.66 times that of the catalyst using NaOH as the precipitating agent.