RuCu nano-alloy catalyst with confinement structure and application thereof in catalysis of preferential oxidation reaction of carbon monoxide

Abstract

The invention discloses a RuCu nano-alloy catalyst with a confinement structure and application thereof in catalysis of a preferential oxidation reaction of carbon monoxide. According to the invention, a MgCuAlRu quaternary hydrotalcite precursor is synthesized by a double-drop method, and then the precursor is reduced in a hydrogen atmosphere to obtain the RuCu nano-alloy catalyst with the confinement structure. In the catalyst, RuCu bimetal nano-alloy particles are uniformly dispersed in a weakly crystallized magnesium-aluminum composite oxide, and the magnesium-aluminum composite oxide has a confinement effect on the RuCu bimetal nano-alloy particles. The catalyst not only improves the conversion rate of preferential oxidation of carbon monoxide, but also greatly improves the selectivity and reaction stability of carbon dioxide. Under the conditions that the temperature is 85 DEG C, the pressure is normal and the air speed is 10-30 h <-1 >, the conversion rate of the preferential oxidation reaction of carbon monoxide is 100%, and the selectivity is 75%. No organic solvent or additive is needed in the preparation process of the catalyst, and the method is simple, convenient and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a RuCu nano-alloy catalyst with a confined structure and its application in catalyzing the preferential oxidation reaction of carbon monoxide. Background technique [0002] Hydrogen is a gaseous clean energy, which mainly comes from the emissions of chemical plants, the combustion of fossil fuels, hydrogen production from biomass, fossil fuels and electrolysis of water. 90% of the hydrogen raw materials come from the first two methods. However, as the reaction medium of the proton membrane fuel cell, the purity should be lower than 100ppm, because the CO contained in the raw gas can affect the Pt metal electrode, the main active catalyst of the battery, even if a noble metal or non-noble metal that can resist CO adsorption is added to the Pt electrode However, a high concentration of CO will still lead to a decrease in the overall working strength and eff...

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Problems solved by technology

However, as the reaction medium of the proton membrane fuel cell, the purity should be lower than 100ppm, because the CO contained in the raw gas can affect the Pt metal electrode, the main active catalyst of the battery, even if a noble metal or non-noble metal that can resist CO adsorption is added to the Pt electrode However, the high concentration of CO will still lead to a decrease in the overall working strength and efficiency of the fuel cell, and even cause irreversible deactivation and other effects.

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