Single-coated multi-component catalyst and preparation method thereof

Abstract

The invention discloses a single-coated multi-component catalyst and a preparation method thereof. The single-coated multi-component catalyst comprises a porous matrix and a mixed catalytic coating, wherein the mixed catalytic coating is applied on the surface of the porous matrix and composed of a catalytic active component and a bonding component which are blended at (1-3): (3-1) by weight percentage. The single-coated multi-component catalyst is simple in preparation and high in high-activity VOCs (volatile organic compounds) combustion catalyzing performance. The preparation method comprises taking ethylene glycol as dispersion reducing agent, in-situ applying one or more types of metal particles onto a La / Y / Pr-doped-and-modified CeZrOx powder through pulsed microwave assisted chemicalreduction; then mixing the coated powder with the prepared bonding component, single-coating the porous matrix with the mixture, and performing drying and baking processes to obtain the target single-coated multi-component catalyst. With precious metal particles and other particles in a composite nano-structure, the prepared single-coated multi-component catalyst is excellent in catalytic activity; meanwhile, the preparation method of the single-coated multi-component catalyst is simple and rapid and accordingly is applicable to large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of environmental protection catalysts, in particular to a single-coated multi-component catalyst and a preparation method thereof. Background technique [0002] Catalytic combustion technology is a major technology for treating VOCs waste gas today. One of its cores is the catalyst, which can significantly reduce the activation energy required for the reaction, making catalytic combustion technology more effective in improving energy utilization efficiency, reducing energy consumption and controlling harmful gas emissions. play an increasingly prominent role. After years of development, the catalysts used in catalytic combustion mainly include noble metal catalysts (Pt, Pd, Ru, Au, Ag, Rh, etc.), transition metals (Cu, Mn, Ni, Co, Fe, Mo, etc.) and rare earths (Ce, Pr, Zr, Y, La, etc.) metals and other composite oxides. Although the cost of non-precious metal catalysts is relatively low, their wider applic...

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Problems solved by technology

[0003] Existing noble metal catalysts not only have high cost due to large loading capacity, but also have disadvantages such as complicated synthesis process and long time-consuming

Such as patent CN 103191733 A catalyst with Al 2 o 3 As a carrier, the noble metal Pd is used as the main catalytic active component, and one or more of the noble metals Pt, Rh, Ru, Ir and the metal oxide CeO 2 , ZrO 2 , La 2 o 3 ,TiO 2 One or several of them are used as catalytic promoters, which can be formed after two steps of impregnation & drying and roasting, and the overall time-consuming is long (>24H)

Patent CN106693987 A obtains PdGa bimetallic particles by liquid-phase reduction of oleylamine system, then uses the impregnation method to load the metal particles on the carrier, and then roasts to form Pd-GaO x / Al 2 o 3 Nano-catalyst, this method uses more organic solvents in the process of synthesizing bimetallic particles, which is also harmful to the environment, and finally requires centrifugation, which makes the operation more complicated

The synthesis methods of other noble metal catalytic active components include hydrothermal method, solvothermal method, ball milling method, etc., all of which are relatively harsh or require long-term operation, which is not conducive to large-scale application

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