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Precious metal loaded MnO2 catalyst for selectively catalytic-reducing NO and preparation method thereof

A technology of precious metals and catalysts, which is applied in the field of catalysts for catalytic reduction of NO and its preparation. It can solve the problems of harsh use conditions, narrow working temperature range, and high cost of precious metals, and achieve the effects of simple method, good NOx removal, and low price.

Inactive Publication Date: 2019-03-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve the problem that the existing metal oxide catalyst has a narrow working temperature range, which leads to the removal of NO x In order to solve the technical problems of poor effect, high cost of noble metals and harsh conditions of use, a noble metal-loaded MnO with selective catalytic reduction of NO is provided. 2 Catalyst and its preparation method

Method used

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  • Precious metal loaded MnO2 catalyst for selectively catalytic-reducing NO and preparation method thereof
  • Precious metal loaded MnO2 catalyst for selectively catalytic-reducing NO and preparation method thereof
  • Precious metal loaded MnO2 catalyst for selectively catalytic-reducing NO and preparation method thereof

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specific Embodiment approach 1

[0017] Specific embodiment 1: Noble metal-loaded MnO for selective catalytic reduction of NO in this embodiment 2 The catalyst is nanotubular MnO 2 Nano precious metal particles are loaded on the surface of the nanometer, wherein the noble metal is Pt, Pd or Au, and the loading amount of the noble metal in terms of mass percentage is 0.1% to 1.5%.

specific Embodiment approach 2

[0018] Specific embodiment 2: Noble metal-loaded MnO for selective catalytic reduction of NO described in specific embodiment 1 2 The preparation method of catalyst is carried out in the following steps:

[0019] 1. Potassium permanganate is added into water, stirred and dissolved to obtain potassium permanganate solution;

[0020] 2. Add hydrochloric acid to the potassium permanganate solution, and stir evenly at room temperature to obtain a precursor solution;

[0021] 3. Transfer the precursor solution to a high-pressure reactor, heat-treat in a furnace at a temperature of 100-200°C for 10-24 hours, then cool to room temperature, filter and wash, and dry the obtained solid at 60-100°C for 10-24 hours, to obtain nanotubular MnO 2 ;

[0022] 4. Take nanotube MnO 2 Put it in a mortar and grind it, and then calculate the mass of the corresponding precious metal acid according to the loading amount of the precious metal in terms of mass percentage of 0.1% to 1.5%, and add th...

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment differs from Embodiment 2 in that the concentration of potassium permanganate in step 1 is 0.05-0.08 mol / L. Others are the same as in the second embodiment.

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Abstract

The invention discloses a precious metal loaded MnO2 catalyst for selectively catalytic-reducing NO and a preparation method thereof, relates to a catalyst for catalytic-reducing the NO and the preparation method thereof, aims to solve technical problems that the effect of removing NOx is poor, cost of precious metal is high and a using condition is rigorous because a working warm area of a current metal oxide catalyst is narrow. The precious metal loaded MnO2 catalyst for selectively catalytic-reducing the NO is that nano precious metal particles are loaded on the nano tube-like MnO2, whereinthe precious metal is Pt, Pd or Au. The preparation method comprises the following steps of: adding hydrochloric acid to a potassium permanganate solution, and synthesizing the nano tube-like MnO2 bya hydrothermal method; dropwise adding precious metal acid to the MnO2, and calcining in a tube-type furnace in which air flows, to obtain the catalyst. The active warm area of the catalyst is 230-700 DEG C, and price is low. The catalyst can be used for the NOx processing field.

Description

technical field [0001] The invention relates to a catalyst for catalytic reduction of NO and a preparation method thereof. Background technique [0002] In recent years, air pollution incidents have occurred frequently in my country, and NO in the atmosphere x It can cause acid rain, photochemical smog, etc., and is also an important reason for the formation of regional fine particle hazards and smog. Nitrogen oxides not only damage plants and buildings but also cause serious harm to human health. NO x Mainly including NO, NO 2 and N 2 O, where NO accounts for NO x Emissions above 90%. It mainly comes from stationary sources such as industrial boilers, thermal power plants, and coal-fired power plants, and mobile sources such as motor vehicle exhaust. With the rapid development of economy and society and the rapid increase of car ownership, vehicle exhaust emissions including NO x Emissions are also rising rapidly. The problem of automobile exhaust pollution is beco...

Claims

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Application Information

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IPC IPC(8): B01J23/656B01J23/68B01D53/86B01D53/56
CPCB01D53/8628B01J23/6562B01J23/688B01J2523/19B01J2523/824B01J2523/828
Inventor 杨春晖高钟玥雷作涛
Owner HARBIN INST OF TECH