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Preparation method of Mo modified Cu-SSZ-13 catalyst

A catalyst, cu-ssz-13 technology, applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc., to make up for the lack of catalytic performance, reduce the generation of N2O, and avoid the effect of secondary pollution

Inactive Publication Date: 2017-01-18
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, Mo has been added as a promoter to Cu-SSZ-13 catalysts for NH 3 -SCR reaction has no relevant patents and literature reports

Method used

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  • Preparation method of Mo modified Cu-SSZ-13 catalyst
  • Preparation method of Mo modified Cu-SSZ-13 catalyst
  • Preparation method of Mo modified Cu-SSZ-13 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Make 0.151 g of copper nitrate into 30 ml of aqueous solution, then pour 1.0 g of H-SSZ-13 molecular sieve into it, stir the resulting mixture at room temperature for 24 h, then evaporate to dryness in a water bath at 80 °C, dry at 110 °C for 12 h, and heat at 550 °C After calcination for 6 h, the finished catalyst was obtained.

Embodiment 2

[0031] 0.151 g of copper nitrate and 0.026 g of ammonium molybdate tetrahydrate were prepared into 30 ml of aqueous solution, and then 1.0 g of H-SSZ-13 molecular sieve was poured into it, and the resulting mixture was stirred at room temperature for 24 h, and then evaporated to dryness in a water bath at 80 °C. After drying at 110 °C for 12 h and calcining at 550 °C for 6 h, the finished catalyst was obtained.

Embodiment 3

[0033] 0.151 g of copper nitrate and 0.065 g of ammonium molybdate tetrahydrate were prepared into 30 ml of aqueous solution, and then 1.0 g of H-SSZ-13 molecular sieve was poured into it. The resulting mixture was stirred at room temperature for 24 h, and then evaporated to dryness in a water bath at 80 °C. After drying at 110 °C for 12 h and calcining at 550 °C for 6 h, the finished catalyst was obtained.

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Abstract

The invention discloses a preparation method of a Mo modified Cu-SSZ-13 catalyst. Ammonium molybdate tetrahydrate and copper nitrate are taken as precursors and are directly dipped and loaded to an H-SSZ-13 (SiO2:Al2O3=10:1) molecular sieve. In the Mo modified Cu-SSZ-13 catalyst, the mass percent of Cu is 4 percent, and the mass percent of Mo is 0.2 to 3 percent. Active components are transition metal Cu<2+>, a Bronsted acidic locus and a Lewis acidic locus. The transition metal catalyzes the NO oxidation, and all the acidic loci take charge of ammonia activation. When the addition of Mo is 0.2 percent, a NO conversion rate temperature window is widened; when the addition of Mo is 0.5 percent or more, a NOx conversion rate temperature window is reduced. Through the adoption of the Mo modified Cu-SSZ-13 catalyst, the discharge of NOx can be reduced, and meanwhile the generation of a by-product N2O can be reduced.

Description

technical field [0001] Due to its high efficiency and durability, diesel engine is more economical and less CO 2 Emissions are widely used. However, diesel exhaust produces more NO x species, leading to problems such as photochemical smog, acid rain, and the destruction of the ozone layer. Controlling NO in Diesel Vehicle Exhaust x The emissions have become one of the most prominent difficulties in the field of catalytic purification of exhaust gas at home and abroad. Selective catalytic reduction of ammonia (NH 3 -SCR) technology has become the main denitrification technology suitable for mobile sources due to its high efficiency and economy. The invention relates to a Mo modified Cu-SSZ-13 catalyst and a preparation method thereof, belonging to the technical field of environmental catalysis. Background technique [0002] Ammonia selective catalytic reduction technology means that under the action of a catalyst, NO x By ammonia or other nitrogen-containing reducing a...

Claims

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Application Information

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IPC IPC(8): B01J29/78B01J37/02B01D53/94B01D53/56
CPCY02C20/10B01J29/783B01D53/9418B01D2258/012B01J37/0205B01J37/0207
Inventor 彭洪根王翔徐娟
Owner NANCHANG UNIV
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