改性ZrO_(2)基催化剂催化乙醇转化制备正丁醇  

Conversion of ethanol to n-butanol over modified ZrO_(2)-based catalysts

作　　者：魏玲 霍霄妮 汪艳霞[2] 董春娟[2] 张铁明 Wei Ling;Huo Xiaoni;Wang Yanxia;Dong Chunjuan;Zhang Tieming(Communal Experimental Center,Taiyuan University,Taiyuan 030024,Shanxi,China;Department of Architecture and Environmental Engineering,Taiyuan University,Taiyuan 030032,Shanxi,China;School of Chemical and Biological Engineering,Taiyuan University of Science and Technology,Taiyuan 030032,Shanxi,China)

机构地区：[1]太原学院公共实验中心,山西太原030024 [2]太原学院建筑与环境工程系,山西太原030032 [3]太原科技大学化学与生物工程学院,山西太原030032

出　　处：《工业催化》2022年第4期48-55,共8页Industrial Catalysis

基　　金：山西省高等学校科技创新项目(2019L1007,2021L577)。

摘　　要：正丁醇是一种重要的化工原料,也可作为燃料添加剂。以乙醇直接缩合制备正丁醇为探针反应,考察Cu、K改性对ZrO_(2)催化剂催化性能的影响。采用BET、XRD、FT-IR、H_(2)-TPR、XPS、乙醇-TPSR和CO_(2)-TPD对不同催化剂进行表征。结果表明,ZrO_(2)催化剂表面乙醇转化率和正丁醇选择性较低,引入Cu改性后,乙醇转化率和正丁醇选择性明显增加,进一步采用碱金属K改性后,乙醇转化率略有下降,而正丁醇选择性进一步提高。Cu的引入促进了乙醇脱氢性能,而K的引入增强了催化剂表面碱性强度,提高了催化剂碱量,促进了缩合反应的进行,从而提高了正丁醇选择性。KCuZrO_(2)催化剂在100 h反应过程中,乙醇转化率保持在约86%,正丁醇选择性约70%,具有较好的稳定性。n-Butanol is an important chemical raw material and can also be used as fuel additive.In this paper,the effect of Cu and K on the catalytic performance of ZrO_(2) catalyst was investigated.The catalysts were characterized by BET,XRD,FT-IR,H_(2)-TPR,XPS,ethanol-TPSR and CO_(2)-TPD.The results showed that the ethanol conversion and n-butanol selectivity on the surface of ZrO_(2) catalyst were low.After Cu modification,the ethanol conversion and n-butanol selectivity were significantly increased.After further modification with alkali metal K,the ethanol conversion decreased slightly,while the n-butanol selectivity was further improved.The introduction of Cu promoted the dehydrogenation performance of ethanol,while the introduction of K enhanced the surface alkaline strength of the catalyst,improved the amount of catalyst alkali,promoted the condensation reaction,and improved the selectivity of n-butanol.In the 100 h reaction process,the ethanol conversion of KCuZrO_(2) catalyst was maintained at about 86%,while the selectivity of n-butanol was about 70%.

关 键 词：催化化学 乙醇 正丁醇 缩合反应 ZrO_(2)基催化剂 

分 类 号：O643.36[理学—物理化学] TQ426.94[理学—化学]