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Metal oxide supported noble metal catalyst, preparation method and use

A technology of noble metal catalysts and oxides, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc. Problems such as the interaction between noble metals and supports, and the lack of good stability of the catalyst, etc., to achieve good methane low-temperature oxidation activity, good industrial application prospects, and uniform morphology

Active Publication Date: 2021-01-05
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the methane combustion catalysts studied need to break the C-H bond at a higher temperature (>400°C), which cannot meet the required temperature of the exhaust gas of a lean-burn engine.
[0003] Noble metal-supported catalysts show good activity for the low-temperature combustion reaction of methane, but this type of catalyst does not have good stability at high temperatures, and noble metals are prone to loss and sintering at higher temperatures, resulting in a decrease in catalyst activity
Supporting noble metals by traditional impregnation methods cannot solve these problems well, because this method generally lacks the interaction between noble metals and supports.

Method used

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  • Metal oxide supported noble metal catalyst, preparation method and use
  • Metal oxide supported noble metal catalyst, preparation method and use
  • Metal oxide supported noble metal catalyst, preparation method and use

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preparation example Construction

[0046] Such as figure 1 As shown, the preparation method of the metal oxide-supported noble metal catalyst of the present embodiment comprises the following steps:

[0047] Such as figure 1 As shown, step 1) S11 is firstly carried out, dispersing the metal salt and alkaline surfactant in the dihydric alcohol, and obtaining a two-dimensional metal precursor by hydrothermal, centrifugal separation, and drying.

[0048] As an example, the ratio of the metal salt, alkaline surfactant and glycol is 0.5-10 mmol: 0.5-5 mmol: 75 mL. For example, the ratio of metal salt and alkaline surfactant can be 0.5~1mol: 0.5~5mmol, 1~5mol: 0.5~5mmol, 5~10mmol: 0.5~5mmol; the ratio of metal salt and glycol can be 0.5~1mmol : 75mL, 1-5mmol: 75mL or 5-10mmol: 75mL, etc. A further preferred ratio of metal salt, alkaline surfactant and dihydric alcohol is 7.5mmol: 1.3mmol: 75mL.

[0049] As an example, dibasic alcohol is used as a solvent and a chelating agent in the reaction, and is selected from...

Embodiment 1

[0062] This embodiment provides a 3%Pd-Co 3 o 4 The preparation method of nanosheets (3% refers to the ratio of the quality of noble metal elements to the total mass of noble metal elements and metal oxides, the following examples are defined the same), comprising the steps of: weighing 7.5mmol cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 1.3mmol PVP (Mw=24000) were dissolved in 75mL of ethylene glycol, stirred and dissolved, transferred to a high-pressure reactor, heated in water at 180°C for 12h, cooled to room temperature, centrifuged and washed with deionized water, Vacuum dried at 60°C for 12 hours to obtain hydroxyethyl cobalt nanosheets, see SEM image Figure 2a . Hydroxyethyl cobalt nanosheets were dispersed in water to obtain a dispersion of hydroxyethyl cobalt (39mM, 30mL), and 5mL of 8.8mg Pd(NO 3 ) 2 solution, after which the dispersion system was placed in a xenon lamp (6A, the light intensity density at 365nm was 50mW / cm 2 ) at room temperature ...

Embodiment 2

[0064] This embodiment provides a 1% Pd-Co 3 o 4 The preparation method of nano sheet, comprises the steps: take by weighing 10mmol cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 2mmol PVP (Mw=48000) were dissolved in 75mL of ethylene glycol, stirred and dissolved, transferred to an autoclave, heated in water at 180°C for 12h, cooled to room temperature, centrifuged and washed with deionized water, and placed in Vacuum drying at 60° C. for 12 h to obtain hydroxyethyl cobalt nanosheets. Hydroxyethyl cobalt nanosheets were dispersed in water to obtain a dispersion of hydroxyethyl cobalt (39mM, 30mL), and 5mL of 2.9mg Pd(NO 3 ) 2 solution, after which the dispersion system was placed in a xenon lamp (10A, the light intensity density at 365nm was 100mW / cm 2 ) at room temperature for 5 min. The Pd-hydroxyethyl cobalt obtained by the reaction was centrifuged, dried, and roasted at 350°C for 5 hours to obtain 1% Pd-Co 3 o 4 Nanosheets. 1%Pd-Co 3 o 4 The nanosheet...

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Abstract

The present invention provides a precious metal catalyst loaded by a metal oxide, a preparation method, and applications. The precious metal catalyst comprises the following components: a precious metal, an oxide of the precious metal, and a metal oxide. In the precious metal catalyst loaded by a metal oxide, the ratio of the mass of the precious metal to the total mass of the precious metal and the metal oxide is -1 to 10:100, and the precious metal catalyst loaded by a metal oxide is of a two-dimensional structure. The preparation method in the present invention is easy to operate, the prepared catalyst has uniform morphology and good stability; and when the catalyst is applied in a methane combustion reaction, the conversion rate of methane reaches 100% when the reaction temperature of C¾ below 400ºC, and a good low-temperature oxidization activity of the methane is provided. In addition, the precious metal catalyst loaded by a metal oxide has the advantages of good stability, a long service life, good water resistance and the like, and has no obvious deactivation phenomenon at the temperature ranging from 310ºC to 500ºC for 100 hours, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a metal oxide-supported noble metal catalyst, a preparation method and an application. Background technique [0002] Due to the declining oil reserves in the world, more and more research focuses on the development of alternative energy sources, and the abundant natural gas energy has become the most promising energy source in the 21st century. However, as the main component of natural gas, methane is not only synthesized as a by-product in some industrial synthesis processes, but also is the main hydrocarbon air pollutant in natural gas fueled vehicles and natural gas power plants, and its greenhouse effect is CO 2 21 times. At present, most of the methane combustion catalysts studied need to break the C-H bond at a relatively high temperature (>400°C), which cannot meet the required temperature of the exhaust gas of a lean-burn engine. [0003] Noble metal-sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/38B01J23/89B01J35/02C10L3/10C10L10/00
CPCB01J23/38B01J23/8913B01J23/892B01J35/02C10L3/10C10L10/00C10L2230/22B01J37/10B01J37/344B01J37/345
Inventor 孙予罕祝艳杨娜婷
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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