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Cerium-molybdenum-zirconium composite oxide catalyst, and preparation method and application thereof

A technology of composite oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve low conversion rate, narrow temperature window, thermal stability and poor anti-sintering ability to achieve high conversion rate, wide temperature window, excellent thermal stability and anti-sintering ability

Active Publication Date: 2014-05-28
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problems of the existing cerium-molybdenum-zirconium composite oxide catalyst with narrow temperature window, low conversion rate, poor thermal stability and anti-sintering ability, one of the purposes of the present invention is to provide a cerium-molybdenum-zirconium composite oxide catalyst

Method used

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  • Cerium-molybdenum-zirconium composite oxide catalyst, and preparation method and application thereof
  • Cerium-molybdenum-zirconium composite oxide catalyst, and preparation method and application thereof
  • Cerium-molybdenum-zirconium composite oxide catalyst, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1～6

[0052] A preparation method of cerium molybdenum zirconium composite oxide catalyst, comprising the steps of:

[0053] (1) Dissolve cerium nitrate and zirconium nitrate in deionized water, stir until completely dissolved, add ammonium molybdate aqueous solution, and then add water to about 250mL to obtain a precursor solution of cerium, molybdenum, and zirconium, and control cerium, molybdenum, and zirconium The concentration of cerium, molybdenum and zirconium ions in the precursor solution;

[0054] (2) Add urea to the precursor solution of cerium, molybdenum, and zirconium obtained in step (1), stir at 90°C for 12 hours to precipitate metal ions, and obtain a mixed solution; the urea and metal ions (cerium, molybdenum, and zirconium ions The sum of moles) has a molar ratio of 10;

[0055] (3) After cooling the mixed liquid obtained in step (2) to room temperature, filter the precipitate to obtain the precipitate, wash the precipitate to neutrality, then dry it in an oven a...

Embodiment 7

[0079] A preparation method of cerium molybdenum zirconium composite oxide catalyst, comprising the steps of:

[0080] (1) Dissolve the cerium precursor and the zirconium precursor in deionized water, stir until completely dissolved, then add the aqueous solution of the molybdenum precursor, and then add water to about 250mL to obtain the precursor solution of cerium, molybdenum, and zirconium, and control the cerium, molybdenum, and zirconium precursor solutions. The concentration of cerium in the precursor solution of molybdenum and zirconium is 0.06mol / L, the concentration of molybdenum is 0.06mol / L, and the concentration of zirconium is 0.12mol / L;

[0081] (2) Add urea to the precursor solution of cerium, molybdenum and zirconium obtained in step (1), stir and precipitate metal ions at 80°C to obtain a mixed solution; the precipitant and metal ions (cerium, molybdenum, zirconium ions sum) the molar ratio is 8;

[0082](3) After cooling the mixed solution obtained in step ...

Embodiment 8

[0085] A preparation method of cerium molybdenum zirconium composite oxide catalyst, comprising the steps of:

[0086] (1) Dissolve the cerium precursor and zirconium precursor in deionized water, stir until completely dissolved, then add the aqueous solution of the molybdenum precursor, and then add water to about 250mL to obtain the precursor solution of cerium, molybdenum, and zirconium, and control the cerium, molybdenum, and zirconium precursor solutions. The concentration of cerium in the precursor solution of molybdenum and zirconium is 0.1mol / L, the concentration of molybdenum is 0.1mol / L, and the concentration of zirconium is 0.2mol / L;

[0087] (2) Add urea to the precursor solution of cerium, molybdenum and zirconium obtained in step (1), stir and precipitate metal ions at 95°C to obtain a mixed solution; the precipitant and metal ions (cerium, molybdenum, zirconium ions and the molar ratio of 15;

[0088] (3) After cooling the mixed liquid obtained in step (2) to r...

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Abstract

The invention relates to a cerium-molybdenum-zirconium (Ce-Mo-Zr) composite oxide catalyst. The molar ratio of Zr to Ce in the catalyst is 1:2, and the molar ratio value of Mo to Ce is 0.1-1.5. By the adjustment of the ratio of the three elements, namely cerium, molybdenum and zirconium, the catalyst which is wide in temperature window, high in conversion rate and excellent in temperature resistance and sintering resistance, and is used for converting nitrogen oxides is obtained; the preparation process is simple, the cost is low, and the realization of the industrialization is facilitated.

Description

technical field [0001] The invention relates to a cerium-molybdenum-zirconium composite oxide catalyst, its preparation method and application, in particular to a cerium-molybdenum-zirconium composite oxide catalyst for selective catalytic reduction of nitrogen oxides, its preparation method and application. Background technique [0002] NH 3 -SCR technology uses ammonia (NH 3 ) as reducing agent, selectively catalytic reduction of nitrogen oxides (NO x )Technology. NH 3 -SCR technology is widely used in stationary and mobile sources of NO x Catalytic removal. [0003] According to the different active components, NH 3 -SCR catalysts can be classified into molecular sieve catalysts, activated carbon catalysts and metal oxide catalysts. Molecular sieve catalysts mainly include ZSM-5, HBEA, SSZ-34 and SAPO-34, etc., and the supported active components mainly include transition metal elements such as Cu, Fe, Ce or rare earth metal elements, but the cost is high, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01D53/90B01D53/94B01D53/56
CPCB01D53/9418B01D2251/2062B01D2251/2067B01D2255/20769B01D2255/407B01D2258/012B01D2258/0283B01J23/28B01J2523/00Y02A50/20B01J2523/3712B01J2523/48B01J2523/68
Inventor 贺泓丁世鹏刘福东石晓燕
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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