Patent ID: 8765632

Claim:
A process for preparing a supported catalyst containing palladium on a carrier, the process comprising: (1) preparing M 2+ Al-LDHs/Al 2 O 3 precursors, including: dissolving an amount of urea into deionized water to obtain a urea solution having a concentration of the urea in the range of 0.2 to 2 mol/L; adding Al 2 O 3 carriers having a mesh size of 26 to 100 with a regular geometry into the urea solution to obtain a second solution, where the content of the Al 2 O 3 carriers is 1 to 6 g/100 mL; stirring the second solution at 80 to 150° C. for 3 to 15 hours to obtain a mixed solution; preparing an M 2+ solution by adding an amount of a soluble M 2+ salt into deionized water; adding the M 2+ solution into the mixed solution, where the concentration of the M 2+ solution is in the range of 0.1 to 1 mol/L, stirring under 80 to 160° C. for 3 to 15 hours, cooling, filtering, washing with deionized water, and drying at 80 to 120° C. to thus obtain the M 2+ Al-LDHs/Al 2 O 3 precursors; and (2) preparing the supported catalyst, including: forming a palladium chloride (PdCl 2 ) aqueous solution, wherein the concentration of the PdCl 2 aqueous solution is at 0.03 to 0.3 mol/L; adding the M 2+ Al-LDHs/Al 2 O 3 precursors prepared in step (1) into the PdCl 2 aqueous solution to obtain a solution, and placing the obtained solution into a shaker under 50 to 90° C. water bath for 1 to 24 hours; filtering the obtained solution, washing with deionized water, drying at 80 to 120° C., and calcining at 300 to 900° C. for 2 to 24 hours to obtain a calcined product; and treating the calcined product by a reduction process under H 2 atmosphere at 200 to 600° C. for 2 to 24 hours to obtain the supported catalyst, wherein the shape of the Al 2 O 3 carriers is one or more types of a spherical shape, a clover shape, and a sheet-like shape, and the crystalline form of the Al 2 O 3 carriers is one or more types of δ,β,γ,θ and η, and wherein M 2+ of the M 2+ Al-LDHs/Al 2 O 3 precursors is one or more types of Mg 2+ , Ni 2+ , Ca 2+ and Cu 2+ .