苯与合成气烃化催化剂的改进研究

STUDY ON MODIFIED CATALYST OF BENZENE ALKYLATION REACTION WITH SYNGAS

采用浸渍法制备了多种用于苯与合成气烃化反应的催化剂,包括单金属和金属与酸性双功能催化剂,考察了不同金属、金属负载量、酸性中心数量、金属与酸中心距离对催化剂性能的影响,并对催化剂稳定性进行了评价。结果表明:金属Zn是活性最佳的金属组元;Zn与HZSM-5组成的双功能催化剂的活性高于单功能催化剂;适当的金属与酸中心比例有利于活性组分在载体上更好地分散,促进反应进行;采用浸渍法制备的催化剂,金属与酸中心距离更近,反应活性最高。300 h稳定性试验结果表明,苯转化率平均为36%,甲苯和C_(8)芳烃的总选择性达到90%,催化剂具有良好的活性和稳定性。

A series of monometallic and metal-acid dual-functional catalysts were prepared by impregnation method,and the effects of different metals,acid materials,metal loading,number of acid centers,and the distance between metal and acid center on the reaction of benzene and syngas were investigated.Stability of the catalyst was also evaluated.As a result,Zn is the most active metal component;the dual-function catalyst composed of Zn and HZSM-5 has higher activity than the single-function catalyst;the proper ratio of metal to acid center is beneficial to the better dispersion of active components on the carrier and promote the reaction;the catalyst prepared by the impregnation method has a closer distance between the metal and the acid center,and has the highest reaction activity.At the same time,the possible reaction path of the benzene and syngas alkylation reaction is verified.The 300 h stability experiment result show that the average conversion rate of benzene is 36%,the selectivity of toluene and xylene is greater than 90%,and the catalyst has good reactivity and stability.