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Preparation method of wide-temperature-range honeycomb type SCR (Selective Catalytic Reduction) denitration catalyst

A denitration catalyst, honeycomb technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. increased effect

Pending Publication Date: 2022-05-06
浙江科卓环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the technical solutions proposed to improve the mechanical strength of the honeycomb catalyst, the main direction is to improve the anti-wear performance of the catalyst, which cannot solve the problem that the honeycomb catalyst is easy to collapse as a whole

Method used

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  • Preparation method of wide-temperature-range honeycomb type SCR (Selective Catalytic Reduction) denitration catalyst
  • Preparation method of wide-temperature-range honeycomb type SCR (Selective Catalytic Reduction) denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. Honeycomb metal substrate pretreatment

[0028] Soak the Fe-Cr-C honeycomb metal substrate in 5% dilute hydrochloric acid solution for 1.5h, and then bake it at 500°C for 1h;

[0029] Step 2. Carrier Layer Coating

[0030] Weigh 826.5g nanometer TiO 2 and 174g of nano-aluminum sol with a solid content of 25%, after mixing evenly, add 82.6g of hydroxyethyl cellulose and 82.6g of polyethylene oxide, use a high-speed mixer to mix for 0.5h, and adjust the kinematic viscosity to 200mm with water during stirring 2 / s; Weigh the pretreated honeycomb matrix and immerse it in the viscous liquid of the carrier layer to stay for 30s, take out the honeycomb upside down and use 2000MHz microwave to quickly dry for 90s, weigh the mass after drying and increase the weight by 262g, and complete the carrier layer coating ;

[0031] Step 3. Active layer coating

[0032] Dissolve 25.7g of ammonium metavanadate with a solution containing 15.4g of monoethanolamine at 90°C, then ...

Embodiment 2

[0037] Step 1. Honeycomb metal substrate pretreatment

[0038] Soak the Fe-Cr-C honeycomb metal substrate in 2% dilute hydrochloric acid solution for 3h, and then bake it at 500°C for 3h;

[0039] Step 2. Carrier Layer Coating

[0040] Weigh 663g nanometer TiO 2 and 468g of nano-aluminum sol with a solid content of 25%, after mixing evenly, add 66.3g of hydroxyethyl cellulose and 66.3g of polyethylene oxide, and use a high-speed mixer to mix for 0.5h. During the stirring process, water is used to adjust the kinematic viscosity to 150mm 2 / s; After weighing the pretreated honeycomb matrix, it is immersed in the viscous liquid of the carrier layer as a whole and stays for 15s. After taking out the honeycomb upside down, use 2500MHz microwave to quickly dry for 45s. After drying, the weighing weight increases by 231g, and the carrier layer coating is completed;

[0041] Step 3. Active layer coating

[0042] Dissolve 51.4g of ammonium metavanadate with a solution containing 30....

Embodiment 3

[0047] Step 1. Honeycomb metal substrate pretreatment

[0048] Soak the Fe-Cr-C honeycomb metal substrate in 2.5% dilute hydrochloric acid solution for 2h, and then bake it at 500°C for 2h;

[0049] Step 2. Carrier Layer Coating

[0050] Weigh 720g nanometer TiO 2 and 320g of nano-aluminum sol with a solid content of 25%, after mixing evenly, add 43.2g of hydroxyethyl cellulose and 57.6g of polyethylene oxide, and use a high-speed mixer to mix for 0.5h. During the stirring process, water is used to adjust the kinematic viscosity to 160mm 2 / s; After weighing the pretreated honeycomb substrate, the whole body is immersed in the viscous liquid of the carrier layer and stays for 20s. After taking out the honeycomb and turning it upside down, use 2200MHz microwave to quickly dry for 60s.

[0051] Step 3. Active layer coating

[0052] Dissolve 38.6g of ammonium metavanadate with a solution containing 23.2g of monoethanolamine at 90°C, then add 171.5g of ammonium heptamolybdate a...

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Abstract

The invention provides a preparation method of a wide-temperature-range honeycomb type SCR (Selective Catalytic Reduction) denitration catalyst, a pretreated Fe-Cr-C material metal honeycomb is arranged in the honeycomb type catalyst, a nano TiO2-Al2O3 carrier layer is firstly coated on the metal honeycomb, then an active layer with V2O5 as an active component and MoO3 and Nb2O5 as active auxiliaries is coated on the carrier layer, and the active layer is coated on the carrier layer. And finally, roasting to obtain the honeycomb catalyst. The prepared catalyst can be suitable for various severe flue gas working conditions, the internal metal honeycomb matrix can be recycled, the denitration efficiency of the catalyst is high, and the catalyst has excellent denitration performance within the range of 200-450 DEG C.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and denitrification catalysis, and in particular relates to a preparation method of a honeycomb SCR denitrification catalyst in a wide temperature range. Background technique [0002] According to the structure type, SCR denitrification catalysts are mainly divided into honeycomb type, flat plate type and corrugated plate type. Compared with the other two structural types, the honeycomb SCR denitrification catalyst was developed the earliest and the technology is the most mature. When my country first started to use SCR denitrification technology , The market share of honeycomb catalysts once exceeded 90%. In recent years, with the rise of plate catalysts, the market share of honeycomb catalysts can still exceed 50%. The honeycomb catalyst has the advantages of large specific surface area, high activity, small catalyst volume, and is conducive to regeneration and recovery. However,...

Claims

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Application Information

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IPC IPC(8): B01J23/00B01J23/28B01J27/22B01J35/04B01J37/02B01J37/08B01J37/34B01D53/86B01D53/56
CPCB01J23/28B01J27/22B01J23/002B01J37/0236B01J37/0244B01J37/08B01J37/346B01D53/8628B01J2523/00B01J35/56B01J2523/31B01J2523/47B01J2523/55B01J2523/56B01J2523/68
Inventor 陈晨戴漪昕曲艳超肖婷
Owner 浙江科卓环保科技有限公司
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