Process for preparing catalyst comprising palladium supported on carrier with high dispersion

A Process for preparing catalyst comprising palladium supported on a carrier, wherein the characters are:

• the detailed process are as follows:
• (1) the preparation of the M2+Al-LDHs/Al2O3 precursors. Weighting certain content of the urea and dissolving it into deionized water, where the obtained concentration of the urea is in the range 0.2˜2 mol/L;
• Adding the Al2O3 carrier (mesh size:
• 26˜100) with regular geometry into the above solution, where the adding content of the Al2O3 is 1˜6 g/100 mL. Stirring the above solution at 80˜150° C. for 3˜15 hours to obtain a mixed solution. Weighting certain content of the soluble M2+ salt into deionized water to form M2+ solution. Based on a certain ratio, adding the M2+solution into the mixed solution, where the concentration of the M2+ solution is in the range of 0.1˜1 mol/L;
• stirring the obtained solution under 80˜160° C. for 3˜15 hours, after the process of cooling, filtration, and washed by the deionized water, the product is dried at 80˜120° C., and the M2+Al-LDHs/Al2O3 precursors can be obtained.
• (2) the preparation of the supported catalyst.
• Weighing certain quality of palladium chloride (PdCl2) to form a PdCl2 solution, wherein the obtained concentrations of PdCl2 aqueous solution maintains at 0.03˜0.3 mol/L;
• adding the M2+Al-LDHs precursors in the step 1 into the PdCl2 aqueous solution, and placing the solution into a shaker under 50˜90° C. water bath for 1˜24 hours;
• After the process of filtration, and washed by the deionized water, the product is dried at 80˜120° C. Then, calcinating the product at 300˜900° C. for 2˜24 hours;
• then the product was treated by a reduction process in a fixed bed reduction equipment under H2 atmosphere at 200˜600° C. for 2˜24 hours. The supported catalyst can be obtained.