Catalyst for HCl oxidation reaction and preparation method and application thereof

The invention discloses a preparation method of a catalyst for HCl oxidation, which comprises the following steps: 1, preparing a composite oxide carrier by adopting a sol-gel method, dissolving two oxides of a titanium source, an aluminum source and a silicon source in a first alcohol solvent, dropwise adding a second alcohol solvent, water and a carboxylic acid mixed solution, stirring, standing and aging to obtain a composite oxide carrier; after drying, roasting in an ozone atmosphere to prepare an oxide carrier; and 2, impregnating metal salt on the oxide carrier by adopting an impregnation method, and carrying out heat treatment and roasting to obtain the required catalyst. The carboxylic acid group is introduced in the preparation of the carrier, so that the loading of the active component on the surface of the carrier in the impregnation process is facilitated, the binding bond energy of the noble metal and the metal on the surface of the carrier is enhanced, and the number of active sites is increase