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Preparation method and application of defect-rich carrier interface reduction anchoring noble metal catalyst

A precious metal catalyst and a reduction technology, which is applied in the field of preparation of a defect-rich carrier interface reduction anchoring precious metal catalyst to achieve the effects of reducing system energy, high energy comprehensive utilization efficiency, and good activity

Pending Publication Date: 2021-08-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the purification problem of methane with a volume concentration of 0.1-1% in the prior art, a preparation method and application of a defect-rich carrier interface reduction anchoring noble metal catalyst are provided, and the interaction between the carrier defect and the catalytic active center improves the concentration of the noble metal catalyst. The dispersion of the catalyst greatly improves the catalytic activity and selectivity; the present invention removes low-concentration methane through catalytic combustion, not only the heat generated in the reaction process can be used for the continuous reaction process itself, but also has higher energy comprehensive utilization Efficiency, which can realize efficient and clean utilization of energy resources and reduce the impact of methane emissions on the environment

Method used

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  • Preparation method and application of defect-rich carrier interface reduction anchoring noble metal catalyst
  • Preparation method and application of defect-rich carrier interface reduction anchoring noble metal catalyst
  • Preparation method and application of defect-rich carrier interface reduction anchoring noble metal catalyst

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preparation example Construction

[0029] The preparation method of the defective carrier in the embodiment of the present invention is as follows

[0030] 1) The carrier is synthesized by the sol-gel method, wherein the carrier is CeO 2 、Co 3 o 4 、MnCo 2 o 4 , LaMnO 3 or LaFeO 3 ; Wherein the calcination temperature of sol-gel method is 700~900 ℃;

[0031] 2) Place the carrier in step 1) in a planetary ball mill ball mill tank for ball milling for 8-12 hours, then add it to dilute nitric acid solution and soak for 30-70 minutes, vacuum filter to separate the solid from the liquid, and wash the solid with deionized water to the washing liquid It is neutral (pH=7), and the defect-type carrier can be obtained after drying; the mass ratio of the carrier to the grinding ball (zirconia grinding ball) is 1:12-1:20, the ball milling speed is 300-500r / min, dilute nitric acid The solution concentration is 0.6~1.4mol / L;

[0032] Wherein, in embodiment 1~5, ball mill pickling method prepares CeO 2 、Co 3 o 4 、Mn...

Embodiment 1

[0037] Example 1: In this example, the noble metal-based catalyst is loaded on a defect-type carrier in a reduced amount, the active component is noble metal Rh, and the carrier is defect-type CeO 2 , in terms of catalyst mass percentage, the active component accounts for 0.2wt.%, and the defective support CeO 2 99.8%;

[0038] A method for preparing a defect-rich carrier interface reduction anchoring noble metal catalyst, the specific steps are as follows:

[0039] (1) At room temperature, add deionized water to the precursor of the noble metal active component (Rh(NO 3 ) 3 ) was stirred and dissolved to obtain a transparent solution A; wherein in solution A Rh(NO 3 ) 3 The concentration is 100mg / L;

[0040] (2) Under stirring conditions, the NH 4 F solution is added to step (1) solution A rapidly and reacts to obtain dark brown sol solution B; wherein NH 4 F solution concentration is 0.1mol / L, reducing agent NH 4 F and Rh(NO 3 ) 3 The molar ratio is 5:1;

[0041] ...

Embodiment 2

[0044] Example 2: In this example, the noble metal-based catalyst is loaded on a defect-type carrier in a reduced amount, the active component is noble metal Pd, and the carrier is a defect-type Co 3 o 4 , based on catalyst mass percentage, the active component accounts for 0.6wt.%, and the defective carrier Co 3 o 4 99.4%;

[0045] A method for preparing a defect-rich carrier interface reduction anchoring noble metal catalyst, the specific steps are as follows:

[0046] (1) At room temperature, add deionized water to the precursor of the noble metal active component (Pd(NO 3 ) 2 2H 2 O) stirring and dissolving to obtain transparent solution A; wherein in solution A, Pd(NO 3 ) 2 The concentration is 125mg / L;

[0047] (2) Under stirring conditions, the NH 4 F solution is added to step (1) solution A rapidly and reacts to obtain dark brown sol solution B; wherein NH 4 F solution concentration is 0.2mol / L, reducing agent NH 4 F and Pd(NO 3 ) 2 The molar ratio is 5.5:...

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Abstract

The invention discloses a preparation method and application of a defect-rich carrier interface reduction anchoring noble metal catalyst, and belongs to the technical field of energy and chemical industry. The preparation method comprises the following steps: at normal temperature, adding deionized water into a noble metal active component precursor, stirring and dissolving to obtain a solution A; under a stirring condition, rapidly adding an NH4F solution into the solution A to react to obtain a sol solution B; and adding a defect-type carrier into the sol solution B, blowing by adopting nitrogen, carrying out bubbling reaction for 2-6 hours, carrying out solid-liquid separation, sequentially cleaning solids by adopting deionized water and ethanol, drying, and roasting at the temperature of 500-700 DEG C for 1-5 hours to obtain the defect-rich carrier interface anchoring noble metal reduction catalyst. The catalyst is used for purifying ultralow-concentration methane (0.1-1vol.%), and the defect-rich carrier reduction anchoring noble metal catalyst has a large number of defects so that the noble metal active component is low in loading capacity, good in dispersity and high in utilization rate, and still has relatively high catalytic activity and stability under the noble metal reduction condition.

Description

technical field [0001] The invention relates to a preparation method and application of a defect-rich support interface reduction anchoring noble metal catalyst, which belongs to the technical field of energy and chemical industry. Background technique [0002] Methane is the main component of natural gas and coalbed methane, and also the main component of some energy and chemical production processes and exhaust emissions from automobile exhaust. During the coalbed methane extraction process, emissions mainly include gas drainage and ventilation air methane discharged from the coal mine ventilation system (in order to ensure production safety, a large amount of air-diluted coal mine gas is introduced), and the latter accounts for 70% of coalbed methane emissions. above. The research on the utilization of ultra-low concentration methane is mainly aimed at the ventilation air methane with methane volume concentration of 0.1-1%. Usually when the volume concentration of metha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89F23G7/07
CPCB01J23/8986F23G7/07
Inventor 王华江磊李孔斋魏永刚祝星顾振华
Owner KUNMING UNIV OF SCI & TECH