Method for preparing three-dimensional rare earth oxide nanorod framework loaded noble metal nanoparticles

Abstract

The invention provides a method for preparing three-dimensional rare earth oxide nanorod framework loaded noble metal nanoparticles. Aluminum, rare earth metal and noble metal are prepared into ternary precursor alloy through a smelting method, the alloy is prepared into an alloy strip in a melt quick quenching mode, the alloy strip is subjected to dealloying and corrosion for 8-14 h in an alkaline solution with the mass percentage being 5-20% under the water bath conditions that the temperature is 60-80 DEG C, then the alloy strip is washed with deionized water and alcohol, the cleaned alloy strip is placed in a constant-temperature drying box to be dried for 2 h at the temperature of 50 DEG C, then the alloy strip is forged for 1 h at 300-600 DEG C, and the blocky three-dimensional rare earth oxide nanorod framework loaded noble metal nanoparticles are obtained. Active components are easily controlled through alloy smelting and dealloying by means of control over original components, and active species grow in a three-dimensional framework composed of rare earth oxide nanorods in situ to form a composite material, so the agglomeration tendency can be prevented, the nanoscale state can be maintained, the nano-effect is fully achieved, and the catalysis performance of the composite material can be greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a three-dimensional rare earth oxide nanorod framework loaded with noble metal nanoparticles. Background technique [0002] Rare earth oxides, as a class of excellent catalyst additives or supports, are widely used in various catalytic reactions due to their strong oxygen storage and release capacity, high oxygen carrying capacity and low price. In order to improve the catalytic performance of rare earth oxides, they are usually combined with a second active substance to form rare earth oxide composite materials. When active elements are used as additive species to prepare nanomaterials, they will exhibit high chemical catalytic activity, especially when active nanoparticles are supported on catalytically active carriers such as rare earth oxides to form nanocomposites, due to the combination of the two catalytic materials to form an active ...

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Problems solved by technology

However, these traditional processes not only require a large amount of organic reagents such as surfactants, growth inducers and protective agents, but also need to strictly control the hydrothermal temperature, time and concentration of the solution, etc.

Moreover, the high surface energy of nano-powders often causes the aggregation of active phases during high-temperature sintering, resulting in a decrease in catalytic performance. Especially in the field of high-temperature catalysis, the catalytic performance is degraded and inactivated due to the agglomeration and sintering of nano-powders.

Moreover, most of the active phases added in this process are deposited on the surface of rare earth oxide nanorods by chemical action. Active species, creating a robust nanoscale interface while maintaining high activity of rare earth oxide-based nanocomposites

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