Load type duplex metal/multi-metal catalyst for hydrogenation synthesis of metanilic acid from m-Nitrobenzenesulfonic acid and preparation method and application

The invention relates to a load type duplex metal/multi-metal catalyst for hydrogenation synthesis of metanilic acid from m-Nitrobenzenesulfonic acid and a preparation method and application thereof. The catalyst comprises a carrier and two or more metal components loaded on the carrier, wherein at least one metal component is selected from active components of Pd and Pt precious metal, the other metal components are selected from auxiliary components with one or more base metals of K, Ca, Mg, La and Ce. The load type duplex metal/multi-metal catalyst is easy to prepare, low in load amount, convenient to regenerate, and capable of being applied to hydrogenation synthesis of metanilic acid from m-Nitrobenzenesulfonic acid, and has the high reaction activity and stability. The catalyst can also be used for the catalysis hydrogenation reaction process of other unsaturated organic compounds with sulfur-containing impurities, the production process is simplified, and the remarkable economic benefits and environmental benefits are achieved.