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A metal oxide and molecular sieve composite denitration catalyst and its preparation method and application

A denitration catalyst and composite technology, applied in the field of metal oxide and molecular sieve composite denitration catalyst and its preparation, to achieve the effects of overall cost reduction, good low-temperature activity and high-temperature stability

Active Publication Date: 2021-01-15
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the limitations of the existing denitrification catalysts, the present invention adopts a compound solution of metal oxides and molecular sieves to increase the surface area of ​​the catalyst, improve the denitrification efficiency of the diesel engine at low speed and the high and low temperature stability of the catalyst

Method used

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  • A metal oxide and molecular sieve composite denitration catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Take the commercially available specific surface area of ​​300m 2 / g γ-alumina 60g, impregnate with 86g manganese nitrate tetrahydrate in equal volume (if the required manganese cannot be uploaded at one time, it can be impregnated several times), dry at 120°C for 4 hours after each impregnation, and bake at 500°C for 1 hour, Gained γ-Al 2 o 3 -MnO 2 Composite metal oxides;

[0052] (2) Immerse 30g of ammonium cerium nitrate solution into the γ-Al obtained in step 1 2 o 3 -MnO 2 On the composite metal oxide, the γ-Al 2 o 3 -MnO 2 -CeO 2 Composite metal oxides;

[0053] (3) Take the commercially available specific surface area of ​​600m 2 / g, (P 2 o 5 +Al 2 o 3 ) / SiO 2 CHA type silicon phosphorus aluminum molecular sieve of 9.2, in 0.15mol / L copper acetate solution, temperature 60°C, exchange for 3 hours, filter, wash once with 500mL water, dry at 100°C for 6 hours, repeat the exchange twice, and roast at 500°C After 1 hour, a Cu-CHA type silicon pho...

Embodiment 2

[0060] Other steps are the same as in Example 1, only the composite metal oxide obtained in step (2) is mixed with the Cu-CHA type silicon phosphorus aluminum molecular sieve obtained in step (3) according to the mass ratio of 1:2 to form a specific surface area of ​​425m 2 / g of mixture.

Embodiment 3

[0062] The other steps are the same as in Example 1, only the composite metal oxide obtained in step (2) is mixed with the Cu-CHA type silicon-phosphorus-aluminum molecular sieve obtained in step (3) according to the mass ratio of 1:1 to form a specific surface area of ​​387m 2 / g of mixture.

[0063] The denitrification performance of the composite catalyst obtained in table 1 embodiment 1-3

[0064]

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Abstract

The invention discloses a metal oxide and molecular sieve composite denitration catalyst as well as a preparation method and application thereof. The metal oxide and molecular sieve composite denitration catalyst is prepared by compounding polymetallic oxide with a transition metal ion exchanged molecular sieve; the polymetallic oxide is a mixture of gamma-Al2O3, MnO2 and CeO2; a transition metalion is Fe<2+> and / or Cu<2+>; the molecular sieve is a CHA type silicon phosphorus aluminum molecular sieve. The composite denitration catalyst disclosed by the invention is excellent in high hydrothermal stability and high low-temperature activity, and is applicable to a denitration process for ship, power plant, boiler and factory combustion exhaust gas.

Description

technical field [0001] The invention belongs to the technical field of preparation of molecular sieve catalysts, in particular to a metal oxide and molecular sieve composite denitration catalyst and its preparation method and application. Background technique [0002] In the world's transportation, ocean transportation occupies a large proportion, accounting for more than two-thirds of the total international trade volume. 90% of my country's total import and export cargo transportation is by ocean transportation. With the rapid increase in the number of transport ships, the pollution and harm caused by the pollutants discharged by ships to the atmospheric environment and marine environment are also becoming more and more serious. The tail gas emitted by the combustion of marine diesel engines is mainly sulfur dioxide SO 2 and nitrogen oxides NO 2 Mainly, according to the statistics of the International Maritime Organization (IMO) in 2014, the annual emission of NO from sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01D53/86B01D53/56
Inventor 宋成文张美涵邵秘华陶平
Owner DALIAN MARITIME UNIVERSITY