Preparation method and denitration application of bimetal MOF-74(Co-Cu) with meso-scale regulation and control multi-level core-shell structure

Abstract

The invention provides a preparation method and denitration application of bimetal MOF-74(Co-Cu) with a meso-scale regulation and control multi-level core-shell structure. According to the catalyst, cobalt-containing long-chain organic molecular salt is selected to be efficiently coordinated with an organic ligand, special surface treatment is conducted on the cobalt-containing long-chain organic molecular salt and the organic ligand, then synthesis modification is conducted in a low-temperature steam environment through crystals, and Cu metal nanometer modified by a surface active agent grows on the surface of a Co precursor to form a multi-level core-shell structure composite material with different thicknesses. The prepared catalyst has the advantages of large specific surface area, good dispersibility and high selectivity. The prepared catalyst has excellent low-temperature catalytic denitration activity, and the conversion rate of nitric oxide reaches 96% or above within an operation window of 200-275 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a novel multi-level core-shell structure MOF-74 (Co-Cu) material with excellent low-temperature CO selective catalytic reduction NO (CO-SCR) performance. It belongs to the field of new material design and preparation, and also involves its practical application as a catalytic material in low-temperature flue gas denitrification. Background technique [0002] Nitrogen oxides (NOx) from fossil fuel combustion are currently considered a major source of air pollution, causing various health and environment-related problems such as photochemical smog, acid rain, ozone depletion, and the greenhouse effect. Selective catalytic reduction technology is the most widely used and most effective means of denitrification in coal-fired power plants. In the traditional NH3-SCR reaction, the reducing agent NH3 consumes a large amount, which is easy to corrode equipment and produce secondary pollutants. In addition, CO ...

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Problems solved by technology

However, in the conventional synthesis methods currently reported, the efficiency is usually low in a solvent environment.

The researchers also found that the inorganic metal salts of Co such as Co(NO3)2·6H2O, CoCl 2 ·6H 2 O,Co(CH 3 COO) 2 4H 2 O is used as a raw material to prepare Co precursors. Experimental studies have found that inorganic salts tend to lead to low deprotonation rates during the reaction process, thereby limiting the coordination efficiency of metals and organic ligands, affecting the synthesis rate of Co precursors, and making bimetallic MOFs materials. The synthesis is difficult and the yield is low

And in previous studies, metal nanoparticles are prone to agglomeration, which reduces the surface area and active sites, thereby reducing the catalytic activity.

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