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Method for preparing hierarchical bimetallic composite oxide denitrification catalyst

A composite oxide and denitrification catalyst technology, which is applied in the field of hierarchical structure bimetallic composite oxide denitration catalyst and its preparation, can solve the problems of poor catalytic mass transfer, lower specific surface, and influence on the catalytic performance of materials, etc.

Active Publication Date: 2014-04-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional bimetallic composite oxide denitration catalysts are usually nanoparticles prepared by co-precipitation method. Due to the difference in the ion product constant of the precursor salt, it is difficult to achieve atomic-level dispersion among active components in this method. The easy agglomeration in the process leads to a decrease in specific surface area and poor catalytic mass transfer, which greatly affects the catalytic performance of the material itself.

Method used

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  • Method for preparing hierarchical bimetallic composite oxide denitrification catalyst
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  • Method for preparing hierarchical bimetallic composite oxide denitrification catalyst

Examples

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Effect test

Embodiment 1

[0017] Dissolving polyvinylpyrrolidone and manganese acetate in a molar ratio of 1:0.1 in a mixed solvent of deionized water and ethanol with a volume ratio of 1:3, stirring to obtain a clear solution A with a metal salt concentration of 0.01 mol / L; A certain amount of potassium cobaltcyanide was dissolved in deionized water to obtain a clear solution B with a concentration of 0.01 mol / L; then, under stirring conditions at room temperature, an equal volume of solution B was slowly dropped into solution A, and continued to stir after the dropwise addition 15 min; after aging at room temperature for 24 h, filter, wash with deionized water and ethanol three times, collect the precipitate, and then dry at room temperature for 12 h to obtain Mn 3 [Co(CN) 6 ] 2 ·nH 2 O precursor. Will Mn 3 [Co(CN) 6 ] 2 ·nH 2 The O precursor is placed in a tube furnace, with 1 o C / min heating rate to 450 o C, keep warm for 2 hours, and finally cool naturally to room temperature with the fur...

Embodiment 2

[0020] Dissolving polyvinylpyrrolidone and manganese acetate in a molar ratio of 1:0.5 in a mixed solvent of deionized water and ethanol with a volume ratio of 1:0.1, stirring to obtain a clear solution A with a metal salt concentration of 0.1 mol / L; A certain amount of potassium cobaltcyanide was dissolved in deionized water to obtain a clear solution B with a concentration of 0.1 mol / L; then at 60 o Under the condition of stirring in C, slowly drop an equal volume of solution B into solution A, and continue stirring for 15 min after the addition; 60 o C was aged for 48 h, filtered, washed three times with deionized water and ethanol, and the precipitate was collected, then dried at room temperature for 12 h to obtain Mn 3 [Co(CN) 6 ] 2 ·nH 2 O precursor. Will Mn 3 [Co(CN) 6 ] 2 ·nH 2 The O precursor was placed in a tube furnace, with 3 o C / min heating rate to 500 o C, keep warm for 4 hours, and finally cool naturally to room temperature with the furnace to obtain...

Embodiment 3

[0023] Dissolving polyvinylpyrrolidone and manganese acetate in a molar ratio of 1:1 in a mixed solvent of deionized water and ethanol with a volume ratio of 1:10, stirring to obtain a clear solution A with a metal salt concentration of 0.05 mol / L; A certain amount of potassium cobaltcyanide was dissolved in deionized water to obtain a clear solution B of 0.05 mol / L; then at 40 o Under the condition of stirring in C, slowly drop an equal volume of solution B into solution A, and continue stirring for 15 min after the addition; 40 o After standing and aging for 48 h, C was filtered, washed three times with deionized water and ethanol, and the precipitate was collected, then dried at room temperature for 12 hours to obtain Mn 3 [Co(CN) 6 ] 2 ·nH 2 O precursor. Will Mn 3 [Co(CN) 6 ] 2 ·nH 2 The O precursor was placed in a tube furnace at 0.05 o C / min heating rate to 600 o C, keeping it warm for 3 hours, and finally cooling down to room temperature naturally with the f...

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Abstract

The invention discloses a method for preparing a hierarchical bimetallic composite oxide denitrification catalyst by employing a prussian blue analogue as a precursor, and belongs to the technical field of hierarchical material preparation and environmental protection. The preparation method comprises the following steps of (a) preparing the prussian blue analogue, wherein the shape and size of the prussian blue analogue are controlled by controlling the reaction temperature, reaction time and the concentration and ratio of reagents under the condition that polyvinylpyrrolidone is used as a surfactant; and (b) calcining the prussian blue analogue prepared in the step (a) by controlling the temperature to obtain the hierarchical bimetallic composite oxide denitrification catalyst. According to the method, due to the combined action of a hierarchical porous structure and highly uniformly dispersed active ingredients, the catalyst has high catalytic activity and a wide active temperature interval, and can be used for the selective catalytic reduction removal of ammonia of nitrogen oxide in flue gas emitted by various movable source and fixed sources.

Description

technical field [0001] The invention belongs to the field of preparation of hierarchical structure metal oxide environmental protection catalysts, in particular to a hierarchical structure bimetallic composite oxide denitration catalyst using Prussian blue analogs as precursors and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) from fossil fuel combustion flue gas emissions from automobile engines and power plant boilers x ) has caused a series of environmental and ecological problems, such as: acid rain, photochemical smog, the hole in the ozone layer, the greenhouse effect, etc., which seriously endanger human health. Therefore, research and development to efficiently eliminate NO x (Denitrification) technology has received extensive attention from researchers, and it is also the focus and difficulty of controlling air pollution. Currently, selective catalytic reduction of ammonia (NH 3 -SCR) nitric oxide technology is the most widely ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/75B01J23/755B01D53/56B01D53/86
Inventor 张登松施利毅张磊颜婷婷张剑平
Owner SHANGHAI UNIV
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