Hydrogenation of p-benzoquinone to hydroquinone over Pd/γ-Al2O3 catalyst
In this paper,a γ-Al2O3-supported palladium catalyst(Pd/γ-Al2O3)was prepared by the impregnation method and was applied to the hydrogenation of p-benzoquinone to produce hydroquinone.The effects of reaction temperature,pressure,time,and amount of catalyst on the performance of Pd/γ-Al2O3 catalyst were investigated.With methanol as the solvent,the conversion of p-benzoquinone,the selectivity of hydroquinone,and the yield were 100%,96.9%,and 96.9%,respectively when the reaction temperature,the pressure of hydrogen,the reaction time,the mass ratio of p-benzoquinone and methanol[m(p-benzoquinone)∶m(methanol)],and the mass ratio of catalyst(by mass of p-benzoquinone)were 30℃,3.0 MPa,2 h,3∶47,and 0.25%,respectively.
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