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Pd-Pt alloy structural catalyst, and preparation method and application thereof

A structured catalyst, pd-pt technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, preparation of amino compounds, etc., can solve the problem of poor selectivity, uneven concentration distribution, reactant Diffusion resistance and different distances, etc., to overcome the effect of intermittent production

Inactive Publication Date: 2012-02-15
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a Pd-Pt alloy structured catalyst, which solves the problems of uneven concentration distribution of reactants, different diffusion resistance and distance of reactants, and poor selectivity when the reactants are in contact with the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Configure the nitric acid solution of 3mol / L, the cordierite honeycomb ceramics (pore density is 62cells / cm 2 ) The carrier is immersed in nitric acid solution for 1 h, washed with water until neutral, and dried. Preparation of γ-Al with a concentration of 10wt% 2 o 3 Solution (γ-Al 2 o 3 The average particle size is 3 μm), and the cordierite carrier treated with nitric acid was impregnated in γ-Al 2 o 3 solution, so that the coating amount reaches 30wt%. Configure 0.42wt% palladium chloride aqueous solution and 0.08wt% chloroplatinic acid aqueous solution, then mix palladium chloride aqueous solution and chloroplatinic acid aqueous solution to obtain a mixed solution (Pd:Pt=5:1), dry for 2h, and roast at 400°C for 4h, A Pd-Pt alloy catalyst with a Pd content of 0.5 wt% was prepared by hydrogen reduction at 500°C for 4 hours. In the structured reactor, the reaction pressure is 4Mp, the reaction temperature is 90°C, and a 25wt% ethyl m-dinitrophenylacetate solutio...

Embodiment 2

[0025] A 2.5 mol / L nitric acid solution was prepared, and the cordierite honeycomb ceramic carrier was immersed in the nitric acid solution for 1 hour, washed with water until neutral, and dried. Preparation of γ-Al with a concentration of 20wt% 2 o 3 Solution (γ-Al 2 o 3 The average particle size is 45 μm), the cordierite carrier treated with nitric acid was impregnated in γ-Al 2 o 3 solution, so that the coating amount reaches 20wt%. Configure 0.84wt% palladium chloride aqueous solution and 0.16wt% chloroplatinic acid aqueous solution, then mix palladium chloride aqueous solution and chloroplatinic acid aqueous solution to obtain a mixed solution (Pd:Pt=5:1), dry for 3h, and roast at 500°C for 4h, A Pd-Pt alloy catalyst with a Pd content of 0.5 wt% was prepared by hydrogen reduction at 300°C for 3 hours. In the structured reactor, the reaction pressure is 3.5Mp, and the reaction temperature is 100°C. A 20wt% ethyl m-dinitrophenylacetate solution is injected into the re...

Embodiment 3

[0027] A 1mol / L nitric acid solution was prepared, and the cordierite honeycomb ceramic carrier was immersed in the nitric acid solution for 1 hour, washed with water until neutral, and dried. Preparation of γ-Al with a concentration of 10wt% 2 o 3 Solution (γ-Al 2 o 3 The average particle size is 20 μm), the cordierite carrier treated with nitric acid was impregnated in γ-Al 2 o 3 solution, so that the coating amount reaches 10wt%. Configure 0.44wt% palladium chloride aqueous solution and 0.06wt% chloroplatinic acid aqueous solution, then mix palladium chloride aqueous solution and chloroplatinic acid aqueous solution to obtain a mixed solution (Pd:Pt=8:1), dry for 2h, and roast at 400°C for 3h, A Pd-Pt alloy catalyst with a Pd content of 4wt% was prepared by hydrogen reduction at 300°C for 4 hours. In the structured reactor, the reaction pressure is 3Mp, the reaction temperature is 100°C, a 20wt% ethyl m-dinitrophenylacetate solution is injected into the reactor with a...

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PUM

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Abstract

The invention belongs to the technical field of catalytic hydrogenation, and particularly relates to a Pd-Pt alloy structural catalyst, and preparation and application thereof. The invention provides the Pd-Pt alloy structural catalyst, and a carrier is cordierite honeycomb ceramics. The Pd-Pt content in the Pd-Pt alloy structural catalyst is 0.01 to 20 weight percent, and the molar ratio of Pd to Pt is 1:(0.01-10). A preparation method comprises the following steps of: (1) pre-treating the carrier; (2) preparing a coating; (3) coating active components; and (4) reducing. The Pd-Pt alloy structural catalyst has better performance than the conventional Pd / C and Pt / C catalysts during m-dinitrobenzene catalytic hydrogenation reaction.

Description

technical field [0001] The invention belongs to the field of catalytic hydrogenation, and in particular relates to a Pd-Pt alloy structured catalyst and a preparation method and application thereof. Background technique [0002] M-phenylenediamine, also known as m-diaminobenzene, is a white needle-like crystal. The substance has a high heat distortion temperature, excellent mechanical properties, dielectric properties and corrosion resistance, and has a strong coupling ability, and is widely used in azo dyes, fur dyes, reactive dyes and sulfur dyes in the dye industry Intermediates, such as the manufacture of basic orange, sulfur yellow, etc., can also be used to manufacture mordants, hair dyes, rubber compounding agents, etc. In recent years, high-temperature-resistant aromatic polyamide resins and flame-retardant fibers synthesized from m-phenylenediamine and phthaloyl chloride have gained some special uses, such as making protective clothing, aerospace materials, etc., a...

Claims

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Application Information

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IPC IPC(8): B01J23/44C07C211/51C07C209/36
Inventor 刘少文王文灿包传平李萍赵慧平尹玲玲
Owner WUHAN INSTITUTE OF TECHNOLOGY
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