Method using a carbon onion-supported Pt single atom catalyst for catalytic hydrogenation of aromatic nitro compound

Abstract

The invention discloses a method using a carbon onion-supported Pt single atom catalyst for catalytic hydrogenation of an aromatic nitro compound, a positive electrode graphite rod electrode is evaporated by arc discharge to provide a carbon source for carbon onion growth, and at the same time, Pt single atoms are formed by reduction of metal cations in a metal salt solution, and embedded in layers of carbon onion. A catalyst sample is washed, dried and used in the selective hydrogenation of the aromatic nitro compound. Results show that the Pt single atom catalyst has the best catalytic performance in ethanol, and the selectivity and the conversion are both greater than 99%. The Pt single atom catalyst prepared by the invention has good stability, not only exhibits excellent catalytic performance in different selective hydrogenation processes, but also can highly-selectively convert halogenated nitrobenzene to halogenated aniline without dehalogenation. The Pt single atom catalyst canbe recycled more than 10 times in the catalytic hydrogenation reaction of p-chloronitrobenzene, and the selectivity and the conversion are both greater than 99%.

Description

technical field [0001] The invention relates to a method for catalytic hydrogenation of aromatic nitro compounds with a carbon onion-supported Pt single-atom catalyst, which belongs to the technical field of catalyst preparation and application. Background technique [0002] Functionalized aromatic amines are widely used in the fields of medicine, pesticide, fuel and chemical industry, and are very important organic intermediates. At present, aromatic amines and functionalized aromatic amines are mainly prepared by selective hydrogenation of aromatic nitro compounds, and the catalytic hydrogenation process is mainly affected by the catalytic performance of catalysts. Studies have shown that supported metal-type catalysts exhibit excellent catalytic performance in the selective catalytic hydrogenation process. However, the catalytic activity of supported metal-type catalysts is mainly affected by the active metal components, but the active metals cannot fully participate in t...

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Problems solved by technology

However, there are many influencing factors in the process of preparing catalysts by this method, such as the surface area of ​​the carrier, the adsorption of the carrier, the pH value of the impregnation solution, the concentration of the impregnation solution, and the impregnation time, etc., which will affect the size, distribution and content of the active components in the catalyst. impact, and the size and degree of dispersion of metal particles are not easy to control when preparing catalysts by this method

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