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SCR denitration catalyst for tail gas treatment of marine diesel engine

A technology for denitrification catalysts and marine diesel engines, which is applied in the direction of physical/chemical process catalysts, mechanical equipment, combustion engines, etc., can solve the problems of the decrease of specific surface area and the influence of catalyst denitrification activity, improve the mechanical strength, solve the problem of tail gas denitration Effect of lowering molding and calcination temperature

Inactive Publication Date: 2017-06-27
福建帕特纳环境产品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing process, the mechanical strength of the SCR catalyst can only meet the requirements when the calcining temperature is 600°C~620°C, and when the calcining temperature is around 500°C, the chemical bonds between V, W and Ti have been formed, and continue to rise. High temperature will cause TiO 2 Slowly shifting from anatase type to rutile type, resulting in a decrease in specific surface area and affecting the denitrification activity of the catalyst

Method used

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  • SCR denitration catalyst for tail gas treatment of marine diesel engine
  • SCR denitration catalyst for tail gas treatment of marine diesel engine
  • SCR denitration catalyst for tail gas treatment of marine diesel engine

Examples

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Embodiment 1

[0026] The embodiment of the SCR denitrification catalyst for denitrification of marine diesel engine tail gas is:

[0027] Step 1: Prepare polyacrylamide into an acidic aqueous solution with a mass concentration of 0.5% and PH=3, and mix the diatomite with a particle size of 1000 mesh and the acidic aqueous solution of polyacrylamide under the action of ultrasound in a mass ratio of 1.2:1. , standing in a closed environment for 4 hours to obtain refined diatomite;

[0028] Step 2: Mix butyl titanate sol (with TiO 2 ) and the refined diatomite obtained in step 1 were quickly mixed evenly under ultrasonic conditions, and dried at 105°C after standing for 6 hours;

[0029] Step 3: Calcining the mixture obtained in Step 2 at 650° C. for 4 hours to obtain an SCR catalyst carrier;

[0030] Step 4: Anatase TiO 2 The common carrier composed of refined diatomite accounts for 85% of the mass fraction, and the product is obtained after mixing with active components, additives and mol...

Embodiment 2

[0035] The embodiment of the SCR denitrification catalyst for denitrification of marine diesel engine tail gas is:

[0036] Step 1: Prepare polyacrylamide into an acidic aqueous solution with a mass concentration of 0.3% and PH=4, and mix the diatomite with a particle size of 1500 mesh and the acidic aqueous solution of polyacrylamide under the action of ultrasound at a mass ratio of 1.5:1. , standing in a closed environment for 4 hours to obtain refined diatomite;

[0037] Step 2: Mix butyl titanate sol (with TiO 2 ) and the refined diatomite obtained in step 1 were quickly mixed evenly under ultrasonic conditions, and dried at 105°C after standing for 6 hours;

[0038] Step 3: Calcining the mixture obtained in Step 2 at 650° C. for 4 hours to obtain an SCR catalyst carrier;

[0039] Step 4: Anatase TiO 2 The common carrier composed of refined diatomite accounts for 80% of the mass fraction, and the product is obtained after mixing with active components, additives and mol...

Embodiment 3

[0044] The embodiment of the SCR denitrification catalyst for denitrification of marine diesel engine tail gas is:

[0045] Step 1: Prepare the cellulose into an acidic aqueous solution with a mass concentration of 0.5% and PH=3, and fully stir and mix the diatomite with a particle size of 2000 mesh and polyacrylamide acidic aqueous solution under the action of ultrasound at a mass ratio of 1.5:1. Stand still for 4 hours in a closed environment to obtain refined diatomite;

[0046] Step 2: Mix butyl titanate sol (with TiO 2 ) and the refined diatomite obtained in step 1 were quickly mixed evenly under ultrasonic conditions, and dried at 105°C after standing for 6 hours;

[0047] Step 3: Calcining the mixture obtained in Step 2 at 620° C. for 4 hours to obtain an SCR catalyst carrier;

[0048] Step 4: Anatase TiO 2 The common carrier composed of refined diatomite accounts for 85% of the mass fraction, and the product is obtained after mixing with active components, additives a...

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Abstract

The invention discloses an SCR denitration catalyst for tail gas treatment of a marine diesel engine. Refined diatomaceous earth and tetrabutyl orthotitanate sol are adopted to prepare a catalyst carrier, glass fiber and aramid fiber with higher mechanical strength serve as a forming strength material, and thus the SCR denitration catalyst has higher mechanical strength. In addition, a forming calcination temperature in a conventional process is reduced to 500-550 DEG C from 600-620 DEG C, energy consumption is reduced, denitration activity of the catalyst can be improved, and performances of the catalyst are more suitable for a flue gas denitrification environment of the marine diesel engine.

Description

technical field [0001] The invention belongs to the technical field of marine diesel engine SCR denitrification catalyst preparation, and in particular relates to an SCR denitrification catalyst for marine diesel engine tail gas treatment. Background technique [0002] With the deterioration of the global environment and the gradual strengthening of people's awareness of environmental protection, air pollution caused by ships has attracted widespread attention from the international community. In 1997, the International Maritime Organization (IMO) passed Annex VI of the MARPOL73 / 78 Convention - Rules for the Prevention of Air Pollution from Ships, which came into effect on May 19, 2005. In October 2008, the amendment to Annex VI was discussed and passed at the MEPC58 meeting, which put forward stricter requirements on the emission of harmful gases from ships, and clarified three stages of the emission limit of nitrogen oxides. Namely TierⅠ, TierⅡ and TierⅢ. [0003] Nitrog...

Claims

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Application Information

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IPC IPC(8): B01J21/08B01D53/94B01D53/56
CPCB01D53/9418B01J21/08Y02T10/12
Inventor 杨广华石磊黄丽明
Owner 福建帕特纳环境产品有限公司
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