▎ 摘　　要

NOVELTY - Composite catalyst comprises graphene oxide and zinc oxide, loaded palladium metal, and sodium, potassium and silver metals, where the content of palladium metal is 1-3 wt.% and the total content of sodium, potassium and silver is 0.1-0.5 wt.%. USE - Composite catalyst used for aromatics hydrogenation dealkylation process. ADVANTAGE - The composite catalyst has low temperature hydrogenation activity and good stability, and reduces the deposition speed. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing composite catalyst which involves: (A) mixing the graphene oxide aqueous solution with zinc oxide, adding ammonium carbonate and polyvinyl alcohol, milling and mixing the powder and drying to prepare composite carrier; (B) using direct current magnetron sputtering for loading of palladium metal to composite carrier; and (C) immersing the composite carrier in palladium salt solution and salt solution of sodium, potassium and silver under acidic conditions, and drying to prepare the composite catalyst.