Heterogeneous catalyst for preparing isophorone, preparation and applications thereof

The present invention provides a method for preparing a heterogeneous catalyst in the presence of a templating agent, wherein the heterogeneous catalyst is used for preparing isophorone through acetone condensation, and is a modified composite oxide (MgO-Al2O3-MOx/2) based on a magnesium aluminum oxide. The preparation method comprises: weighing a certain amount of a mixed salt, dissolving ina certain amount of water, adding a certain amount of a templating agent, adding a certain amount of a precipitating agent to the mixed salt solution in a dropwise manner at a certain temperature, aging, filtering, washing, drying, and calcining to obtain the catalyst. Compared with the catalyst in the prior art, the catalyst of the present invention has advantages of simple preparation method, low price, low bulk density, high activity, high selectivity and good stability. According to the present invention, in the reaction for preparing isophorone through acetone condensation, the reaction temperature is 250-300 DEG