Dehydrogenation Of 2,3-Butanediol To 3-Hydroxybutanone Over CuZnAl Catalysts

Cu catalysts due to their high catalytic activity,mild reaction conditions,such as the characteristics of wide application in the methanol synthesis,water vapor reforming hydrogen solution and alcohol dehydrogenase,esters,but because of the low melting point Cu base catalyst,easy sintered at high temperature,poor stability,lead to shorten the life of catalysts,often join in the process of industrial preparation of zinc additives as structure,add Al as carrier in order to improve the stability of the reaction.Although both at domestic and overseas for the Cu Zn Al catalyst alcohol dehydrogenation has many research,but less study dibasic alcohol dehydrogenation reaction,based on the preparation of 2,3-butanediol dehydrogenation 3-hydroxy ethyl ketone,for the purpose of through XRD,H₂-TPR,SEM,BET,XPS characterization methods,studied the Cu Zn Al catalyst dehydrogenation reaction active center,and examines the different reduction time catalytic activity of the catalysts,using different alkali metal of Cu Zn Al catalyst modification and the Li elements of different mass fraction,The effects of alkali metals on the physical and chemical properties and catalytic activity of Cu Zn Al catalyst were studied,and the best dehydrogenation conditions were explored.Research results show that the Cu Zn Al ternary catalyst for preparation of 2,3-butanediol dehydrogenation 3-hydroxy ethyl ketone has excellent catalytic activity and the different reduction time of Cu Zn Al catalyst characterization and activity evaluation showed that the activity of dehydrogenation catalysts is Cu~0 species,but appropriate Cu~0/Cu⁺proportion will optimize the dehydrogenation activity,characterizing the Cu Zn Al catalyst of different alkali modification,the results showed that the alkali metal doping can promote the dehydrogenation activity of Cu Zn Al enhance the interaction between the components,structure of Zn O as fertilizer spread Cu species,In addition,Cu O will enter the Zn O lattice and form Cu O/Zn O structure during the preparation process.Due to the strong substitution of Zn²⁺and Cu²⁺,the sintering of Cu species can be prevented,and the stability of the catalyst can be improved.Li elements for different quality of the modified Cu Zn Al catalyst activity evaluation found that the 2 wt.%Li-Cu Zn Al catalyst has the most excellent catalytic activity,reduction temperature,Cu increase in the number of active sites,generate the kind of spinel structure（Cu Al₂O₄）is beneficial to the thermal stability of catalyst,for 2,3-butanediol dehydrogenation reaction showed superior catalytic performance.