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Low-temperature SCR (Selective Catalytic Reduction) denitration catalyst with multilevel macroporous-mesoporous structure and preparation method thereof

A denitration catalyst and mesoporous structure technology are applied in the field of low-temperature selective catalytic reduction (SCR) denitration catalyst and its preparation, which can solve the problems of poor activity, unsatisfactory activity, and poor sulfur resistance, and achieve good sulfur resistance. , Superior low temperature activity, the effect of reducing operating costs

Inactive Publication Date: 2013-05-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, Mn / TiO 2 The catalyst has attracted people's attention due to its superior low-temperature activity, but Mn / TiO 2 The catalyst still has the following shortcomings: (1) the activity is not satisfactory in the low temperature range; (2) the sulfur resistance at low temperature is generally poor
[0005] The patent document with the patent application number 201010260914.3 discloses a TiO 2 - Mesoporous SiO 2 It is a SCR flue gas denitrification catalyst with a composite carrier, which has good denitrification activity only in the high temperature range; the patent document with the patent application number 201110158203.X discloses a catalyst based on mesoporous TiO 2 Supported SCR flue gas denitration catalyst based on mesoporous TiO 2 as carrier, WO 3 and CeO 2 as additives, V 2 o 5 As an active component, the catalyst shows good activity in the range of 200-450 °C, but poor activity in the low temperature range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1, preparing a multi-level macroporous-mesoporous SCR denitration catalyst, with the oxide of Mn as the active component, and with the structure of TiO 2 As a carrier, a surfactant is added during the preparation process to form a multi-level macroporous-mesoporous structure. The mass percentages of the two components of the selected catalyst are: Mn oxide 6%, TiO 2 94%.

[0019] During preparation, the surfactant was first dissolved in absolute ethanol to make the concentration 5 g / L; then, tetrabutyl titanate was dissolved in the obtained solution, and then glacial acetic acid was added to obtain a yellow transparent sol. Wherein, the mass ratio of tetrabutyl titanate, dehydrated alcohol and glacial acetic acid is 1:1:0.2; In the yellow transparent sol that step obtains, add the Mn(NO 3 ) 2 The solution was stirred for 0.5 hours to obtain a dark yellow transparent sol. where Mn(NO 3 ) 2 The mass ratio of tetrabutyl titanate to tetrabutyl titanate is 0.1...

Embodiment 2

[0021] Embodiment 2, the mass percent of two kinds of compositions of selection catalyst is: the oxide compound 17% of Mn, TiO 2 83%.

[0022] Dissolve the surfactant in absolute ethanol first to make the concentration 22 g / L. Then, tetrabutyl titanate was dissolved in the obtained solution, and then glacial acetic acid was added to obtain a yellow transparent sol. Wherein, the mass ratio of tetrabutyl titanate, absolute ethanol and glacial acetic acid is 1:1.5:0.5. To the obtained yellow transparent sol, 50% by mass of Mn(NO 3 ) 2 The solution was stirred for 4 hours to obtain a dark yellow transparent sol. where Mn(NO 3 ) 2 The mass ratio to tetrabutyl titanate is 0.33:1. The obtained sol was left to stand at room temperature for 7 days to obtain a tan gel. The gel was dried and then fired at 500 °C for 6 hours.

[0023] The catalyst was tested for denitrification under fixed bed simulated flue gas conditions, and the results showed that when the space velocity was...

Embodiment 3

[0024] Embodiment 3, two kinds of composition mass percents of selection catalyst are: the oxide compound 30% of Mn, TiO 2 70%.

[0025] Firstly, the surfactant was dissolved in absolute ethanol so that the concentration was 30 g / L; tetrabutyl titanate was dissolved in the obtained solution, and then glacial acetic acid was added to obtain a yellow transparent sol. Wherein, the mass ratio of tetrabutyl titanate, absolute ethanol and glacial acetic acid is 1:1:2; Mn(NO 3 ) 2 The solution was stirred for 6 hours to obtain a dark yellow transparent sol. where Mn(NO 3 ) 2 The mass ratio of tetrabutyl titanate to tetrabutyl titanate is 0.41:1; the obtained sol was left to stand at room temperature for 14 days to obtain a yellow-brown gel. The gel was dried and then fired at 600 °C for 8 hours.

[0026] The simulated flue gas denitrification test shows that when the space velocity is 30000 h -1 , NO volume concentration is 1000 ppm, NH3 / NO=1.0, when the oxygen concentration...

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Abstract

The invention relates to a low-temperature SCR (Selective Catalytic Reduction) denitration catalyst with a multilevel macroporous-mesoporous structure and a preparation method thereof. The preparation method is characterized by drying and roasting to obtain the multilevel macroporous-mesoporous catalyst by using oxide of Mn as an active component and TiO2 with the multilevel macroporous-mesoporous structure as a carrier. During the preparation of the catalyst, the oxide of Mn is added in the form of manganous nitrate; TiO2 adopts tetrabutyl titanate as a titanium source; and a surfactant is added to form the multilevel macroporous-mesoporous structure. The catalyst comprises the following components in percentage by weight: 6%-30% of oxide of Mn and 70%-94% of TiO2. The denitration activity of the catalyst reaches 90% at 100 DEG C, and reaches 100% at 120 DEG C; and when 30ppm of SO2 is ventilated for 8 hours, the denitration activity of the catalyst at 120 DEG C still can be kept at 80% or higher.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and relates to a low-temperature selective catalytic reduction (SCR) denitrification catalyst with a multi-level macropore-mesoporous structure and a preparation method thereof. Background technique [0002] Nitrogen oxides are the key pollutants that cause air pollution in my country. The "Twelfth Five-Year Plan" adopted in March 2011 included nitrogen oxides in the binding index system for the first time, requiring a 10% reduction; implemented in January 2012 The "Emission Standards of Air Pollutants for Thermal Power Plants" also put forward stricter requirements on the emission of nitrogen oxides. Nitrogen oxides have become the focus of my country's next stage of pollution reduction. [0003] Take NH 3 The process of reducing agent has become the most widely used flue gas denitrification technology in industry due to its high purification efficiency, small secondary pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10B01D53/90B01D53/56
Inventor 陈硕石姸妮全燮于洪涛
Owner DALIAN UNIV OF TECH
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