Preparation method and application of nanometer ceria-zirconia solid solution-based catalyst for selectively catalytically oxidizing ammonia

A cerium zirconium solid solution, catalytic oxidation technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of high complete conversion temperature of ammonia gas and expensive catalyst , poor stability and other problems, to achieve the effect of good thermal stability, low price and good stability

Inactive Publication Date: 2011-02-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is that above-mentioned catalyst is expensive, N 2 Disadvantages of low selectivity, poor stability, and high temperature for the complete conversion of ammonia

Method used

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  • Preparation method and application of nanometer ceria-zirconia solid solution-based catalyst for selectively catalytically oxidizing ammonia
  • Preparation method and application of nanometer ceria-zirconia solid solution-based catalyst for selectively catalytically oxidizing ammonia
  • Preparation method and application of nanometer ceria-zirconia solid solution-based catalyst for selectively catalytically oxidizing ammonia

Examples

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Effect test

Embodiment 1

[0023] (1) Ce 0.8 Zr 0.2 o 2 Solid solution preparation

[0024] Weigh 6.4200g of cerium nitrate hexahydrate and 1.5868g of zirconium nitrate pentahydrate and dissolve them in 30ml and 20ml of water respectively. After completion, mix the above two metal salt solutions and stir for 10 minutes; at the same time, weigh 2.6940g CTAB and dissolve it in 100ml water, keep n(CTAB) / [n(Ce)+n(Zr)]=0.4, and keep stirring at room temperature Pour the mixture of the two metal salts into the CTAB aqueous solution and stir for 30 minutes; add a certain amount of ammonia water to the above mixture, adjust the pH value to 9 under continuous stirring, age at room temperature for 12 hours, and then put it into a polytetrafluoroethylene high-pressure reactor After 24 hours of constant temperature at 90°C, the temperature was naturally lowered and cooled, washed with deionized water and absolute ethanol, centrifuged, and dried in an oven at 100°C for 24 hours; under air conditions, placed in a ...

Embodiment 2

[0028] According to the preparation method of the present invention in Example 1, the molar ratio of cerium to zirconium is changed, x is taken as 0.6, the precursor of the active component Cu is changed to copper acetate, the calcination temperature is changed to 450°C, and the catalyst 6% Cu / Ce is prepared 0.6 Zr 0.4 o2 , denoted as catalyst B. where Ce 0.6 Zr 0.4 o 2 N in solid solution 2 Adsorption / desorption and pore size distribution see figure 2 .

Embodiment 3

[0030] According to the preparation method of the present invention in Example 1, x is taken as 0.5, and n(CTAB) / [n(Ce)+n(Zr)]=0.6 is changed, the precipitation agent is sodium hydroxide, and the catalyst 6%Cu / Ce is prepared 0.5 Zr 0.5 o 2 , denoted as catalyst C.

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Abstract

The invention relates to a preparation method and application of a nanometer ceria-zirconia solid solution-based catalyst for selectively catalytically oxidizing ammonia. The preparation method is characterized in that: a carrier of the prepared catalyst is ceria-zirconia solid solution, and the active ingredients are copper, silver, manganese, iron and the like; and the carrier is prepared by an anionic surfactant method, and the active ingredients are loaded on the ceria-zirconia solid solution by a deposit-precipitation method or impregnation method. The raw material used in the method is not toxic or harmful, and the prepared catalyst has the characteristics of large specific area, mesoporous structure and the like. The catalyst prepared by the method has the advantages of high low-temperature activity, 100 percent of conversion rate when NH3 is at 280 DEG C, good N2 selectivity, wide temperature window, high stability, catalysates of N2 and H2O and no secondary pollution. If the prepared catalyst is pulped and loaded to a honey-comb shaped metal wire mesh or a honey-comb ceramic, the catalyst can be applied to ammonia pollution treatment in tail gas of the practical industry and has wide application prospect.

Description

technical field [0001] The invention is applied to the field of environment-friendly catalysis technology, and relates to a method for eliminating ammonia pollution generated in processes such as agriculture, industry, and transportation, and selectively catalytically oxidizing ammonia into pollution-free N 2 and H 2 The preparation method and application of the metal composite oxide catalyst of O. Background technique [0002] With the progress of society and the improvement of people's living standards, the protection of atmospheric environment has become a very important topic. And nitrogen-containing compounds, such as NO, N 2 O, NO 2 and NH 3 , the pollution of the environment has attracted more and more attention. Among them, ammonia gas has become a research hotspot in recent years because of its irritating effect on human eyes, nasal mucosa and other parts at low concentrations. The sources of ammonia mainly include, industry (tail gas emission during liquid ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/02B01D53/86B01J23/10B01D53/58
Inventor 曲振平王忠全燮李新勇梁春霞孙红
Owner DALIAN UNIV OF TECH
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