2 results about "Palladium compound" patented technology

The application belongs to the technical field of organic synthesis, and particularly relates to a method for catalytically synthesizing N-substituted-3-methyl indole compounds by using aza carbene oxazoline ring palladium compound. The application aims to provide a new synthesis method for N-substituted-3-methyl indole compounds, specifically, a high-catalytic-activity aza carbene oxazoline ring palladium compound is used as a catalyst to catalyze a direct coupling cyclization reaction of o-dichlorobenzene or o-bromochlorobenzene compounds and allyl arylamine, so as to obtain N-substituted-3-methyl indole compounds. The catalyst used in the application has high catalytic activity, the reaction has good product and functional group compatibility, in addition, the catalyst itself is easy to synthesize, and aryl chlorides used in the synthesis route are cheap and easy to obtain. Therefore, the synthesis route provided in the application has great competitive advantages and industrial production utilization value.

This invention provides a method for the oxidation reaction of Freon with oxygen in the air. The method includes: co-supporting palladium and cerium compounds on an Al₂O₃ or TiO₂ support, followed by calcination and hydrogen reduction to obtain a palladium-cerium bicomponent catalyst; loading the catalyst into a fixed-bed reactor, introducing a mixture of Freon and air, and carrying out a catalytic oxidation reaction at 300-400°C and atmospheric pressure to convert Freon into CO₂, HF, HCl, and H₂O; the reaction products are then condensed, absorbed by alkaline solution, and adsorbed by activated carbon before being discharged in compliance with standards. This invention addresses the problems of easy agglomeration, poisoning, and short lifespan of single-component palladium catalysts by introducing a cerium component to construct a Pd-Ce synergistic system, effectively inhibiting palladium particle migration and agglomeration, and enhancing the catalyst's resistance to carbon deposition and halogen poisoning. This invention has advantages such as high degradation efficiency, long catalyst lifespan, mild process conditions, and no secondary pollution, and is suitable for the harmless treatment of waste refrigerants and industrial waste gas containing Freon.