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Denitration catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of single catalyst carrier components, poor anti-poisoning performance, etc., and achieve widened reaction temperature window and high surface energy , improve the effect of the structure

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above patents first loaded Al on the surface of the cordierite carrier 2 o 3 Coating, increase the surface area, but load the second carrier coating or directly load the active component, the catalyst carrier has a single component, and the anti-poisoning performance is poor

Method used

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  • Denitration catalyst and preparation method thereof
  • Denitration catalyst and preparation method thereof
  • Denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Cordierite pretreatment: completely immerse cordierite honeycomb ceramics in 5wt% nitric acid solution for 1 hour, rinse with deionized water for 3 times after taking it out, put it in an oven at 120°C, and dry it for 10 hours to obtain Surface activated cordierite honeycomb ceramic support.

[0035] Aluminum sol preparation: 20 grams of pseudoboehmite was added to 150 mL of deionized water, and 7 grams of concentrated nitric acid was added dropwise while stirring. After stirring for a certain period of time, heat to 80°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 2-5, and age for 24 hours to obtain a transparent aluminum sol with a content of 8wt% based on alumina.

[0036] Preparation of silicon-aluminum coating slurry: first mix 90 grams of aluminum sol with 6 grams of fumed silica, add 4 grams of fatty alcohol polyoxyethylene ether (molecular formula is RO(CH 2 CH 2 O) 5 H, where R is C 7 ~C 9 ) after stirring a...

Embodiment 2

[0043] Cordierite pretreatment: with embodiment 1.

[0044] Aluminum sol is commercially available (solid content is 15%, pH is 3-4).

[0045] Preparation of polyvinyl alcohol solution: 9.5 grams of polyvinyl alcohol (molecular formula is (C 2 h 4 O) n ) was dissolved in 91 grams of deionized water, slowly heated to 80°C, and stirred until completely dissolved to obtain a PVA solution with a concentration of 9.45wt%.

[0046] Preparation of silicon-aluminum coating slurry: First, mix 87 grams of aluminum sol and 10 grams of fumed silica evenly, add 3 grams of alkylphenol polyoxyethylene ether (molecular formula is RC 6 h 4 O(CH 2 CH 2 O) n H, where R is C 9 ~C 12 , n is 9~12) After stirring and mixing for 30 minutes, the coating liquid can be obtained.

[0047] Composite coating slurry preparation: add 54 grams of nano-titanium dioxide (50-100nm), 32 grams of ZSM-5 molecular sieve (80-200nm, silicon-aluminum ratio of 25), 17.2 grams of nano-cerium oxide, and add 280m...

Embodiment 3

[0053] Cordierite pretreatment: with embodiment 1.

[0054] Aluminum sol preparation: same as embodiment 1.

[0055] Preparation of silicon-aluminum coating slurry: firstly mix 92 grams of aluminum sol with 4 grams of fumed silica, add 4 grams of secondary octanol polyoxyethylene ether (molecular formula is C 8 h 17 (CH 2 CH 2 O) n H, wherein n is 1-6) After stirring and mixing for 30 minutes, the coating liquid can be obtained.

[0056] Composite coating slurry preparation: 25 grams of nano-titanium dioxide (100-150nm), 5 grams of ZSM-5 molecular sieve (80-200nm, silicon-aluminum ratio of 25), 9.2 grams of nano-zirconia, adding 210ml of carbonic acid solution (0.3mol / In L), after stirring evenly, add 45 grams of aluminum sol to it, use a high-shear dispersing emulsifier (FLUKO FA25 10000rpm) to shear and disperse for 10 minutes, and then add 6.1 grams of 2-octanyl polyoxyethylene ether (molecular formula is C 8 h 17 (CH 2 CH 2 O) n H, wherein n is 1 ~ 6), and then ...

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Abstract

The invention discloses a denitration catalyst and a preparation method thereof, the catalyst takes pretreated cordierite honeycomb ceramics as a matrix, a silicon-aluminum coating, a composite coating and an active component are coated on the surface of the matrix, by measuring gross weight of the catalyst, the catalyst contains 80-90wt% of cordierite honeycomb ceramics, 2-9wt% of silicon-aluminium coating, 3-10wt% of composite coating, and 0.01-15wt% of active component, wherein the active component can be Mn and Fe; by measuring gross weight of the silicon-aluminum coating, the silicon-aluminum coating comprises 10-50wt% of silica, and 50-90wt% of alumina; by measuring gross weight of the composite coating, the composite coating contains 40-80wt% of titanium dioxide, 5-35wt% of ZSM-5 molecular sieve, and 10-40wt% of auxiliary agent; wherein the auxiliary agent is selected from one or more of cerium oxide, zirconia or lanthana. The denitration catalyst has the advantages of large coating load capacity, high firmness, good poison-resistance performance and activity, and wide reaction temperature window; and the preparation method is simple and is suitable for industrial application.

Description

technical field [0001] The invention relates to a denitration catalyst and a preparation method thereof. Background technique [0002] NO x It is the main pollutant that forms acid rain, photochemical smog and atmospheric ozone layer destruction. During the "Twelfth Five-Year Plan" period, it has been clearly requested that NO x Realize total control. The "Emission Standards of Air Pollutants for Thermal Power Plants" implemented in 2012 requires NO x Emission limit is 100mg / m 3 . Therefore, how to effectively remove nitrogen oxides in flue gas has become an urgent problem to be solved. In the current denitrification technology, selective catalytic reduction (SCR) uses reducing agents such as ammonia to selectively reduce NO in exhaust gas through the action of catalysts. x Reductive conversion to N that is harmless to the atmosphere 2 and H 2 O, with the characteristics of good selectivity and high efficiency, has become the most widely used flue gas denitrificatio...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01D53/90B01D53/56
Inventor 杨爱霞王学海陈玉香刘淑鹤
Owner CHINA PETROLEUM & CHEM CORP
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