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Cerium-niobium-zirconium composite oxide catalyst, preparation method and uses thereof

A technology of composite oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of narrow temperature window, poor low temperature activity, etc., and achieve The effect of widening the temperature window, improving the low-temperature activity, and making the preparation process simple and easy

Active Publication Date: 2015-02-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature window of this oxide is narrow, and its low-temperature activity is poor. In order to apply it to NO in diesel vehicle exhaust x Efficient removal of , it must be further optimized and modified

Method used

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  • Cerium-niobium-zirconium composite oxide catalyst, preparation method and uses thereof
  • Cerium-niobium-zirconium composite oxide catalyst, preparation method and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Completely dissolve a certain amount of cerium nitrate and zirconium nitrate in a certain amount of deionized water, and then add fully dissolved NbCl 5 Aqueous solution and excess urea precipitant, wherein urea / (cerium nitrate + zirconium nitrate + niobium pentachloride) molar ratio is 10:1, finally add deionized water to the above mixed solution to a total volume of 250ml, and put it in a 90°C water bath Under the condition of continuous stirring for 12h. After the above mixed solution is cooled to room temperature, the obtained precipitate is fully suction-filtered and washed to neutral with deionized water, and then the precipitate is dried in an oven at 100°C for 12h, and finally roasted at 500°C for 3h in an air atmosphere , to get the composition as CeNb a Zr 2 o x The cerium niobium zirconium composite oxide catalyst, wherein a is 0.1.

Embodiment 2

[0043]All the other conditions are the same as in Example 1, except that the control a is 0.5.

Embodiment 3

[0045] All the other conditions are the same as in Example 1, except that the control a is 1.

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Abstract

The present invention relates to a cerium-niobium-zirconium composite oxide catalyst, a preparation method and uses thereof. The catalyst has the following chemical composition: CeNbaZr2Ox, wherein a is 0-1.0 and does not include 0. The method comprises: (1) preparing a mixed aqueous solution comprising a cerium source and a zirconium source; (2) adding a niobium source aqueous solution and an excess urea precipitation agent to the mixed solution in the step (1) to completely precipitate cerium, niobium and zirconium; (3) carrying out suction filtration and washing on the obtained precipitated product to obtain the filter cake; and (4) drying and calcining the filter cake to obtain the cerium-niobium-zirconium composite oxide catalyst, wherein the catalyst has characteristics of excellent low-temperature activity, wide operation temperature window, high N2 selectivity and high NOx conversion rate, and can be used for the NH3-SCR reaction.

Description

technical field [0001] The invention relates to a cerium-niobium-zirconium composite oxide catalyst, a preparation method and an application thereof. Background technique [0002] NH 3 Selective Catalytic Reduction of NO x (NH 3 -SCR) is currently the diesel vehicle exhaust NO x Control technology, the catalyst used is mostly V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 . However, there are still many problems in this system, such as narrow operating temperature window, TiO 2 Prone to crystal transformation and active component V 2 o 5 Biological toxicity etc. Therefore, the development of highly efficient and environmentally friendly NH 3 -SCR catalyst for diesel vehicle exhaust NO x Control has very important environmental implications. [0003] CeO 2 Usually used as NH 3 -Auxiliary agent or support for SCR catalyst, but it is prone to sintering at high temperature, thus reducing the activity. The study found that CeO 2 The stability of cerium-zirconium oxide formed by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01D53/90B01D53/56
Inventor 贺泓丁世鹏刘福东连志华谢利娟石晓燕
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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