Preparation method and application of bipyridine functionalized COF loaded palladium nanoparticles

Abstract

The invention relates to a preparation method and an application of bipyridine functionalized COF loaded palladium nanoparticles. The preparation method comprises the following steps: adding 1,3,5-benzenetricarboxaldehyde and 5,5'-diamino-2,2'-dipyridyl in an organic solvent to obtain a mixed solution A, dropwise adding an aqueous acetic acid solution into the mixed solution A, sequentially carrying out liquid nitrogen freezing-vacuumizing-thawing cycle operation, performing vacuum sealing, thawing to room temperature, and carrying out a constant-temperature reaction at 120-150 DEG C for 3-6 d; carrying out unsealing, dropwise adding tetrahydrofuran to carry out a quenching reaction, carrying out solid-liquid separation, washing the solid, and carrying out vacuum drying to obtain a solid powder D; and carrying out wet grinding on the solid powder D to obtain a micropowder, sequentially adding ethanol and a palladium salt solution into the micropowder, carrying out a stirring reaction for 2-4 h, dropwise adding a NaBH4 solution until the mixed solution is brown yellow, continuously carrying out a reaction for 1-2 h under a stirring condition, carrying out solid-liquid separation, washing the solid, and carrying out vacuum drying to obtain the bipyridine functionalized COF supported palladium nanoparticles. The bipyridine functionalized COF loaded palladium nanoparticles are usedas a catalyst for catalyzing a semi-hydrogenation reaction of acetylene.

Description

technical field [0001] The invention relates to a preparation method and application of bipyridyl functionalized COF-loaded palladium nanoparticles, belonging to the technical field of catalysts. Background technique [0002] Ethylene is one of the chemical products with the largest output and the core raw material of the petrochemical industry. Its output is an important symbol to measure the development level of a country's oil industry. The development of ethylene industry also drives the development of fine chemicals, light industry textiles, automobile manufacturing, building materials industry, mechanical electronics and modern agriculture, and plays an important role in the economic field. Ethylene is generally produced by cracking naphtha in the industry, but 0.1%-0.5% of acetylene is often produced in this process. The presence of acetylene will poison and deactivate the Ziegler-Natta catalyst used to produce polyethylene. Add acetylene to remove. In industry, ace...

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Problems solved by technology

Supported palladium-based catalysts are widely used due to their excellent low-temperature catalytic activity for acetylene, but there are also problems such as low ethylene selectivity and easy deactivation of the catalyst.

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