Nitrogen-doped ordered mesoporous carbon-loaded nano-palladium material and preparation method thereof

Abstract

The invention belongs to the technical field of the mesoporous material preparation, and relates to a nitrogen-doped ordered mesoporous carbon-loaded nano-palladium material and a preparation method thereof. The material has a three-dimensional cubic mesostructure, a large specific surface area (100-200 m2/g), a large pore volume (0.1-1.0 cm<3>/g), and a uniform pore diameter (2-3 nm), the nitrogen content is controlled to be 9 wt%, the size of the palladium nanoparticles is uniform and controllable (0.1-2 nm), and the palladium content is controlled to be 0.2-5 wt%. The preparation method comprises the following steps: mixing and stirring a pre-synthesized low-grade phenolic resin and a F127 aqueous solution at a certain temperature for 14-16 h, then performing low concentration hydrothermal treatment for 24 h, performing vacuum drying for 12 h, performing calcination on the material together with a nitrogen-containing small molecule under the nitrogen protection to obtain a brown powder, performing immersion in a palladium chloride ethanol solution, and performing the mixed reduction of hydrogen and nitrogen to obtain the ordered mesoporous carbon material-loaded palladium catalyst. The prepared material can be used in the selective hydrogenation reaction of phenol, cinnamaldehyde and the like. The preparation method of the catalytic material is simple, the cost is low, and the equipment requirements are simple and convenient.

Description

technical field [0001] The invention belongs to the field of materials, and relates to an ordered mesoporous carbon material, in particular to a nitrogen-doped ordered mesoporous carbon supported nano palladium material and a preparation method thereof. Background technique [0002] The preparation of supported metal catalysts usually has the problem of uneven metal size distribution or large metal particles. This inhomogeneity affects the efficient utilization of metal active sites and thus reduces the selectivity to specific products in reactions. This is because only a small fraction of metal particles with suitable size distribution in the catalyst can serve as catalytically active sites, and other larger-sized particles may be inert or cause undesired side reactions during the reaction. Recent theoretical and experimental studies have shown that subnanometer-sized metal clusters and catalysts with well-defined single-site catalysts have better catalytic activity or sel...

AI Technical Summary

Problems solved by technology

However, silica or other inert substances are usually used as the carrier, and the binding force between the carrier and the precious metal palladium is weak. During the reaction, the catalyst has problems such as metal palladium loss, agglomeration, and easy poisoning and deactivation.

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