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PtCo nano-alloy modified Co3O4-SiO2 flower-like multistage composite material and preparation method thereof

A technology of co3o4-sio2 and composite materials, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, carbon compounds, etc., can solve the problem that active substances and catalytic substrates cannot be fully contacted and cannot be effectively Inhibit the problems of agglomeration and sintering of active materials, not easy structural stability, etc., and achieve the effects of stable product morphology, convenient and simple product processing, and easy control of reaction conditions

Pending Publication Date: 2021-02-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their practical application is greatly limited because the two-dimensional nanostructures are not easy to maintain structural stability at high temperature.
SiO 2 As a kind of high thermal stability and chemical stability, it is often used as a carrier and core-shell structure in heterogeneous catalytic reaction systems to stabilize active components, but as a carrier, it cannot effectively inhibit the active components in high temperature environments. At the same time, the core-shell structure will prevent the active material and the catalytic substrate from fully contacting and reduce the catalytic activity.

Method used

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  • PtCo nano-alloy modified Co3O4-SiO2 flower-like multistage composite material and preparation method thereof
  • PtCo nano-alloy modified Co3O4-SiO2 flower-like multistage composite material and preparation method thereof
  • PtCo nano-alloy modified Co3O4-SiO2 flower-like multistage composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0065] 1)Co 3 o 4 -SiO 2 Synthesis steps of composite materials:

[0066] Step 1: Weigh a certain mass of CuCl respectively 2 ·6H 2 O and CoCl 2 ·6H 2 O, configured at a concentration of 5 mM CuCl 2 aqueous solution and 5mM CoCl 2 aqueous solution. The silicon wafer was pretreated, cut into small square pieces of 1cm*1cm, and then ultrasonically washed with ethanol and acetone alternately until the solution was clear, then ultrasonicated three times with deionized water and stored in deionized water for later use.

[0067] The second step: add 5mL of CuCl to the 30mL polytetrafluoroethylene high temperature reaction kettle with a pipette gun 2 aqueous solution and 15 mL of CoCl 2 Aqueous solution, then add 200mg of urea and a piece of treated silicon chip, stir to dissolve.

[0068] Step 3: Cover and seal the reaction kettle and place it in an electric heating constant temperature blast drying oven at a temperature of 1°C min -1 The heating rate was increased from ...

Embodiment 2

[0083] 1)Co 3 o 4 -SiO 2 Synthesis steps of composite materials:

[0084] Step 1: Weigh a certain mass of CuCl respectively 2 ·6H 2 O and CoCl 2 ·6H 2 O configured as CuCl at a concentration of 5 mM 2 aqueous solution and 5mM CoCl 2 aqueous solution. The silicon wafer was pretreated, cut into small square pieces of 1cm*1cm, and then ultrasonically washed with ethanol and acetone alternately until the solution was clear, then ultrasonicated three times with deionized water and stored in deionized water for later use.

[0085] The second step: add 5mL of CuCl to the 30mL polytetrafluoroethylene high temperature reaction kettle with a pipette gun 2 aqueous solution and 15 mL of CoCl 2 Aqueous solution, then add 200mg of urea and a piece of treated silicon chip, stir to dissolve.

[0086] Step 3: Cover and seal the reaction kettle and place it in an electric heating constant temperature blast drying oven at a temperature of 1°C min -1 The heating rate is increased from...

Embodiment 3

[0096] 1)Co 3 o 4 -SiO 2 Synthesis steps of composite materials:

[0097] Step 1: Weigh a certain mass of CuCl respectively 2 ·6H 2 O and CoCl 2 ·6H 2 O, configured at a concentration of 5 mM CuCl 2 aqueous solution and 5mM CoCl 2 aqueous solution. The silicon wafer was pretreated, cut into small square pieces of 1cm*1cm, and then ultrasonically washed with ethanol and acetone alternately until the solution was clear, then ultrasonicated three times with deionized water and stored in deionized water for later use.

[0098] The second step: add 5mL of CuCl to the 30mL polytetrafluoroethylene high temperature reaction kettle with a pipette gun 2 aqueous solution and 15 mL of CoCl 2 Aqueous solution, then add 300mg ~ 500mg of urea and a piece of processed silicon chip, stir to dissolve.

[0099] Step 3: Cover and seal the reaction kettle and place it in an electric heating constant temperature blast drying oven at a temperature of 1°C min -1 The heating rate was incre...

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Abstract

The invention discloses a PtCo nano-alloy modified Co3O4-SiO2 flower-like multistage composite material and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a Co3O4-SiO2 composite material; and (2) preparing the PtCo / Co3O4-SiO2 composite material. The PtCo / Co3O4SiO2 composite material with the three-dimensional flower-shaped structure, prepared by the method, has very high CO catalytic oxidation activity and excellent high thermal stability, and PtCo nanoparticles do not have obvious agglomeration and sintering after the PtCo nanoparticles are circularly catalyzed for 20 times within the temperature range of 100-400 DEG C. The method is novel in process, universal in preparation condition, stable in product morphology, high in purity, convenient and simple in product treatment and suitable for medium-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a PtCo nano-alloy modified Co 3 o 4 -SiO 2 Flower-like multi-level composite material and its preparation method. Background technique [0002] Many industrial catalytic reactions, such as CO oxidation, oxidative combustion, and hydrogenation reduction, need to be carried out at a reaction temperature above 300 ° C. Therefore, designing a catalyst that can withstand high temperatures and have high catalytic performance is very important for people's industrial production. has vital significance. At present, Pt-containing nanocomposites have been extensively studied to catalyze CO oxidation, especially Pt nanoparticles dispersed on supports with high specific surface area can effectively improve the utilization of active atoms to achieve high catalytic activity. Regrettably, Pt nanoparticles are prone to agglomeration and sintering in order to reduce the surface ener...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/02C01B32/50
CPCB01J23/002B01J23/8913C01B32/50B01J35/00B01J35/30Y02E60/50
Inventor 温鸣仲帅吴丹丹
Owner TONGJI UNIV
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