Dehydrogenation Of Secondary Butanol Catalyzed By Potassium Modified CuZnAl Catalyst

Methyl ethyl ketone（MEK）is a common chemical solvent in industry,which is widely used in oil refining,pharmaceutical and other fields.In the production process of methyl ethyl ketone,dehydrogenation of secondary butanol alcohol（SBA）to methyl ethyl ketone is the most frequently used.Cu Zn Al catalyst is the best choice for this reaction.In this paper,K-modified Cu Zn Al（K-Cu Zn Al）catalysts with different potassium content were prepared by impregnation method with potassium element introduced.The effect of K content on the structure and performance of the catalyst was discussed by characterization and catalytic activity investigation.The optimum reaction conditions for dehydrogenation of para-butanol with K-Cu Zn Al catalyst with the best amount of K were investigated.Finally,the kinetics of the reaction was studied.Specific research contents are as follows:（1）XRD,H₂-TPR,SEM,BET and XPS were used to characterize the catalyst,and the performance of the catalyst was investigated by observing the results of dehydrogenation of para-butanol.The experimental results show that the introduction of potassium increases the dispersion of Cu species on the surface of Cu Zn Al catalyst and increases the content of Cu~0 after reduction.Under the conditions of normal pressure,reaction temperature of 240 ^oC and LHSV of 3.5 h^-1,the activity of Cu Zn Al catalyst modified by 2%（w）K is the best.Compared with Cu Zn Al catalyst,the conversion of para-butanol increases from 77.6%to83.5%,the selectivity of methyl ethyl ketone increases from 89%to 93.5%,and the yield of methyl ethyl ketone increases from69.1%to 78.1%.The modified catalyst has excellen t stability.（2）Using Matlab analysis software,hyperbolic and power function dynamics models were used to carry out least square parameter fitting for the experimental data results of the reaction.The results show that the rate of dehydrogenation of para-butanol is controlled by the dehydrogenation of para-butanol on the surface of catalyst,and the apparent activation energy is 45.51k J·mol^-1 when using hyperbolic kinetic model.When the power function kinetic model was used to analyze the reaction,the reaction order was 1.37 and the apparent activation energy was58.36 k J·mol^-1.