Catalyst for synthesizing cyclohexene by hydrogenation of benzene ring and preparing method thereof

The invention relates to a catalyst for synthesizing cyclohexene by hydrogenation of benzene ring and a preparing method thereof. The catalyst consists of activated carbon carrier, metal ruthenium and promoter; the promoter is one or the mixture of more than two from platinum, palladium, rhodium, cobalt and nickel. The method comprises the following steps: pretreated activated carbon is added into water-soluble compound solution of metal ruthenium or mixed water-soluble precursor solution of the metal ruthenium and the promoter so as to be stirred and soaked, thus obtaining mixed slurry; the PH value of the mixed slurry is regulated by alkali compound aqueous solution, after stirring and filtering, the filter cake is washed to neutrality by water, and then after the filter cake is beaten by water, the PH value of the mixed slurry is regulated by the alkali compound aqueous solution, then a chemical reducer is added to reduce ruthenium carbon catalyst in liquid phase, and after washing, the filter cake is transferred into an oven so as to be dried, thus obtaining the product of the ruthenium carbon catalyst. The catalyst has good catalytic activity and high selectivity and is especially suitable for catalytic hydrogenation for synthesizing cyclohexene by the hydrogenation of benzene ring, and the preparing method has simple operation and short production period.