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Preparation method of cerium-based composite oxide low-temperature SCR catalyst taking Ce-MOF as precursor

A technology of SCR catalyst and composite oxide, which is applied in the field of low-temperature SCR catalyst preparation of cerium-based composite oxides, can solve the complicated impregnation process and other problems, and achieve the effect of fast synthesis, simple impregnation process, and outstanding low-temperature activity

Inactive Publication Date: 2020-04-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent (CN 110252317 A) discloses a preparation of octahedral Fe using MIL-53(Fe) as a precursor 2 o 3 combined with the impregnation method to prepare Ce-Fe and W-Fe composite oxides, all of which have good NH 3 -SCR reactivity, but the impregnation process is too complicated

Method used

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  • Preparation method of cerium-based composite oxide low-temperature SCR catalyst taking Ce-MOF as precursor
  • Preparation method of cerium-based composite oxide low-temperature SCR catalyst taking Ce-MOF as precursor
  • Preparation method of cerium-based composite oxide low-temperature SCR catalyst taking Ce-MOF as precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 5.20g Cu(NO 3 ) 2 ·3H 2 O in 1000mL ethanol, after stirring and dissolving, add 16g Ce-MOF (equivalent to 6.90g CeO 2 ), placed in an oil bath at 60°C, stirred at 300r / min for 12h, then filtered to remove excess copper nitrate solution, washed with alcohol to remove copper nitrate molecules on the surface, and dried at 100°C to obtain a catalyst precursor. The catalyst precursor was put into a muffle furnace and calcined at 350°C for 5h to obtain 1# sample. The content of CuO in the sample is shown in Attached Table 1, the same below.

Embodiment 2

[0029] Weigh 3.68g Cu(NO 3 ) 2 ·3H 2 O in 1000mL ethanol, after stirring and dissolving, add 16g Ce-MOF (equivalent to 6.90g CeO 2 ), placed in an oil bath at 60°C, stirred at 300r / min for 12h, then filtered to remove excess copper nitrate solution, washed with alcohol to remove copper nitrate molecules on the surface, and dried at 100°C to obtain a catalyst precursor. The catalyst precursor was put into a muffle furnace and calcined at 350°C for 5h to obtain 2# sample.

Embodiment 3

[0031] Weigh 2.33g Cu(NO 3 ) 2 ·3H 2 O in 1000mL ethanol, after stirring and dissolving, add 16g Ce-MOF (equivalent to 6.90g CeO 2 ), placed in an oil bath at 60°C, stirred at 300r / min for 12h, then filtered to remove excess copper nitrate solution, washed with alcohol to remove copper nitrate molecules on the surface, and dried at 100°C to obtain a catalyst precursor. The catalyst precursor was put into a muffle furnace and calcined at 350°C for 5h to obtain 3# sample.

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Abstract

The invention discloses a preparation method of a cerium-based composite oxide low-temperature SCR catalyst taking Ce-MOF as a precursor, and belongs to the technical field of catalyst preparation. The method comprises the following specific steps: dissolving trimesic acid (BTC) into an organic solvent, adding a cerium salt solution, and stirring for 15 min at a proper temperature to obtain a Ce-MOF sample; dissolving a soluble modified metal source into ethanol, adding Ce-MOF, and stirring for 12 h at a certain temperature to obtain a precursor of a composite oxide catalyst; and roasting andgrinding the precursor, so as to obtain the CuO-CeO2 and Fe2O3-CeO2 low-temperature SCR catalyst. According to the invention, high dispersion of CuO or Fe2O3 on CeO2 is realized by utilizing the highspecific surface area, ordered pore structure and relatively strong adsorption capacity of Ce-MOF, so that the low-temperature SCR reaction catalytic activity of the composite oxide is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of a cerium-based composite oxide low-temperature SCR catalyst and its application in ammonia selective catalytic reduction of nitrogen oxides, belonging to the technical field of catalyst preparation. Background technique [0002] Nitrogen oxides are one of the major air pollutants, including N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 etc., commonly used NO X express. NO X There are many hazards, such as forming photochemical smog, affecting plant growth, destroying building materials, accelerating rubber aging and destroying the ozone layer. Ammonia selective catalytic reduction is currently the most effective flue gas denitrification technology that has been commercialized, and it has been widely used in flue gas denitrification in thermal power plants. The core of SCR technology is the catalyst, widely used is the vanadium-titanium system, mainly V 2 o 5 -WO 3 / TiO 2 or V 2 o 5 -Mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/56
CPCB01J37/0009B01J23/83B01D53/8628
Inventor 邱文革王佳丽何洪宋丽云叶婧桐张通
Owner BEIJING UNIV OF TECH
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