A method for in-situ growth and doping modification of metal oxide nanocatalysts

Abstract

The invention relates to the technical fields of nucleation of a metal oxide nanometer catalyst, growth control, doping modification, environmental catalytic purification, micro-arc oxidization, nanometer materials and nano-technologies, in particular to an in-situ growth and doping modification method for the metal oxide nanometer catalyst. According to the in-situ growth and doping modificationtechnology for the metal oxide nanometer catalyst, a micro-arc oxidization method is mainly utilized for directly growing a metal oxide nanometer catalyst material on the surface of a metal substrate,and the metal oxide nanometer catalyst material is subjected to doping modification. The prepared metal oxide nanometer catalyst is good in crystallinity, large in active area, relative uniform in size, uniform in growth and distribution, and applicable to the fields of automobile tail gas treatment, denitration and desulfurization treatment, industrial waste gas treatment, CO catalytic oxidization and relevant environmental catalytic purification.

Description

technical field [0001] The invention relates to the fields of metal oxide catalyst nucleation and growth control, doping modification, environmental catalytic purification, micro-arc oxidation, nanomaterials and nanotechnology, and in particular relates to in-situ growth and doping modification of a metal oxide nanocatalyst method. Background technique [0002] At present, with the continuous development of the economy, a series of environmental pollution problems caused by it are becoming more and more serious, especially the abnormal climate and smog that have occurred continuously in recent years. These environmental pollutions mainly come from the emission of harmful substances in automobile exhaust, incompletely combusted CO in industrial waste gas, various incompletely combusted hydrocarbons, nitrogen oxides, sulfur oxides, etc. The removal of these harmful substances currently mainly relies on noble metal catalysts (such as: Pt, Pd, etc.) with good catalytic performa...

AI Technical Summary

Problems solved by technology

The metal catalyst coated on the surface of the honeycomb ceramic substrate has poor bonding force with the substrate, and it is easy to fall off from the surface of the honeycomb substrate under heat, humidity, vibration and corrosive environments, resulting in a decrease in catalyst performance and service life. Secondary repair or replacement of the honeycomb matrix increases the cost of use

Although the metal catalyst integrated with the ceramic substrate is not easy to fall off, the active crystal surface area exposed to the environment is significantly reduced, which directly affects its catalytic conversion efficiency. This requires the development of a metal catalyst that does not affect its catalytic performance. effective method

[0004] At present, the reports on metal oxide nanocatalyst materials mainly include hydrothermal method, microwave method, mechanical synthesis method, electrochemical synthesis method, sputtering method, co-precipitation method, etc., but the above methods have high cost and complicated process to varying degrees. , Not easy for industrial application, poor crystallinity, easy to agglomerate, easy to fall off, easy to produce toxic gas, difficult to control the product shape, etc., can not meet the needs of the application

Although the preparation of metal oxides by micro-arc oxidation has been reported (Jiang et al, "Highly Efficient Nanoarchitectured Ni 5 TiO 7 Catalyst for Biomass Gasification"ACSAppl.Mater.Interfaces 2012,4,4062-4066), but it only reported the growth of Ni-Ti-O on the surface of rod-shaped metal substrates, for the doping modification and Metal substrates of different shapes and specifications have not been studied, and these aspects are crucial for the practical application of metal oxide nanocatalyst materials

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