Preparation process and application of catalyst for preparing propylene glycol

The invention discloses a preparation process and application of a catalyst for preparing propylene glycol, and the preparation process comprises the following steps: (1) soaking aluminum-magnesium hydrotalcite powder in water, separating out the aluminum-magnesium hydrotalcite after the aluminum-magnesium hydrotalcite powder is fully absorbed, and then freeze-drying the aluminum-magnesium hydrotalcite to obtain modified aluminum-magnesium hydrotalcite; (2) putting the modified aluminum-magnesium hydrotalcite into a saturated solution of a Fe < 3 + > source, heating and preserving heat, separating out the modified aluminum-magnesium hydrotalcite after sufficient absorption, drying the modified aluminum-magnesium hydrotalcite, dispersing the modified aluminum-magnesium hydrotalcite into absolute methanol to form a dispersion liquid, and then adding sodium borohydride to perform a reduction reaction on the aluminum-magnesium hydrotalcite to obtain a precursor after the reduction reaction is completed; and (3) p