Diacetone alcohol hydrogenation catalyst as well as preparation method and application thereof

The invention disclose a diacetone alcohol hydrogenation prepared iso-hexylene glycol catalyst which comprises an active component nickel and a modified Y molecular sieve, wherein the mass ratio of the active component nickel to the modified Y molecular sieve in oxide is (15:85)-(45: 55), preferably (20:80)-(35:65); the properties of the modified Y molecular sieve are as follows: the specific surface area is 500-900 m /g and preferably 600-800 m /g, the total pore volume is 0.20-0.6 ml/g, the average pore size is 1.9-3.0 nm, the relative crystallinity is 80-110%, the mole ratio of silicon to aluminum is 3-30 and preferably 10-20, the cell parameter is 2.425-2.445 nm, the proportion of medium-strong acid is 50-90%, and the boric oxide content is less than or equal to 4.0wt% and preferably less than or equal to 2.5wt%. The catalyst can be applied to the fixed bed process, shows excellent high activity and stability in long-period running process and can be used for continuously and stably producing iso-hexylene glycol.