【摘要】 以糠醛催化加氢合成糠醇作为模型反应,采用共沉淀法制备的Cu/MgO-K2O作为催化剂,考察了Pd-Cu膜反应器的加氢性能.膜反应器由双套管组成,采用分别进料的方式操作.即糠醛气化后由载气带入中心膜管的催化床层,而氢气则进入管壳层通过Pd-Cu合金膜渗透到反应区.在不同条件下分别进行糠醛催化加氢反应,考察了糠醛转化率、产品糠醇选择性和收率,并与传统的共进料填充床反应器进行比较.研究结果显示,膜反应器比传统的填充床反应器具有产品收率高、选择性好和副产物少的特点.此外,本文结合催化剂的组成、结构和表面形貌的表征对催化剂的催化活性和失活行为进行了讨论.更多还原

【Abstract】 The performance of the membrane reactor（MR） for the hydrogenation of furfural to furfuryl alcohol over a Cu/MgO-K₂O catalyst prepared by the coprecipitation method as a model reaction was studied.The membrane reactor was composed of double-tube and operated with separate feed,i.e.,furfural vapor with carrier gas flowed over the catalyst bed in the tube,and hydrogen permeated through Pd-Cu alloy composite membrane from shell side to tube side.The effect on conversion,selectivity and yield was investigated for different parameters such as temperature,hydrogen to furfural feed molar ratio and feed rate.Performance comparison between MR and the conventional packed-bed reactor（PBR） was made.The results showed that MR gave higher yield and better selectivity of the product and less side-products as compared to PBR under the same operation conditions.In addition,on the basis of the information obtained by the characterization of catalyst composition,structure and morphology,activity and deactivation behavior of the catalyst were discussed.更多还原