SCR catalyst for ship diesel engine post-treatment, and preparation method thereof

A technology for SCR catalysts and marine diesel engines, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as unsatisfactory temperature window, hydrothermal stability, poor sulfur resistance performance, etc., and achieve broadened activity Temperature window, excellent hydrothermal aging resistance, and high denitrification rate

Inactive Publication Date: 2015-08-19
碗海鹰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of catalyst has good adsorption performance and good flexibility, but it still cannot meet the temperature window in the actual denitrification process, and its hydrothermal stability and sulfur resistance performance are relatively poor

Method used

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  • SCR catalyst for ship diesel engine post-treatment, and preparation method thereof
  • SCR catalyst for ship diesel engine post-treatment, and preparation method thereof
  • SCR catalyst for ship diesel engine post-treatment, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: preparation V-ZSM-5 molecular sieve catalyst:

[0029] (1) High specific surface area ZSM-5 molecular sieve pretreatment: accurately weigh ZSM-5 molecular sieve powder (SiO 2 / Al 2 o 3 =50) 20g, put it in an oven, and dry it at 120°C for 3 hours to remove excess moisture in the molecular sieve;

[0030] (2) Preparation of active component solution: Weigh 2.078g of ammonium metavanadate in proportion, put it into a beaker, and inject 17.726g of water into the beaker (required water volume = ZSM-5 molecular sieve mass × ZSM-5 molecular sieve specific pore volume), stir well to make it evenly mixed;

[0031] (3) Catalyst preparation: place the pretreated ZSM-5 molecular sieve powder in a crucible, add the prepared active component solution drop by drop into the ZSM-5 molecular sieve powder with a rubber dropper, and keep stirring, Until the ZSM-5 molecular sieve powder becomes viscous, stop adding the active component solution dropwise. The prepared V-ZS...

Embodiment 2

[0032] Embodiment 2: preparation V-W-ZSM-5 molecular sieve catalyst:

[0033] (1) High specific surface area ZSM-5 molecular sieve pretreatment: accurately weigh ZSM-5 molecular sieve powder (SiO 2 / Al 2 o 3 =80) 20g, put it in an oven, and dry it at 120°C for 3 hours to remove excess moisture in the molecular sieve;

[0034](2) Preparation of active component solution: Weigh 2.078g of ammonium metavanadate and 2.352g of ammonium tungstate in proportion, put them into a beaker, and pour 20.060g of water into the beaker (required water volume = ZSM-5 molecular sieve mass × specific pore volume of ZSM-5 molecular sieve), stir well to make it evenly mixed;

[0035] (3) Catalyst preparation: place the pretreated ZSM-5 molecular sieve powder in a crucible, add the prepared active component solution drop by drop into the ZSM-5 molecular sieve powder with a rubber dropper, and keep stirring, Until the ZSM-5 molecular sieve powder becomes viscous, stop adding the active component ...

Embodiment 3

[0036] Embodiment 3: preparation V-Cu-ZSM-5 molecular sieve catalyst:

[0037] (1) High specific surface area ZSM-5 molecular sieve pretreatment: accurately weigh ZSM-5 molecular sieve powder (SiO 2 / Al 2 o 3 =80) 20g, put it in an oven, and dry it at 120°C for 3 hours to remove excess moisture in the molecular sieve;

[0038] (2) Preparation of active component solution: Weigh 1.768g of ammonium metavanadate and 1.826g of copper nitrate in proportion, put them into a beaker in turn, and pour 20.060g of water into the beaker (required water volume = ZSM-5 molecular sieve mass × specific pore volume of ZSM-5 molecular sieve), stir well to make it evenly mixed;

[0039] (3) Catalyst preparation: place the pretreated ZSM-5 molecular sieve powder in a crucible, add the prepared active component solution drop by drop into the ZSM-5 molecular sieve powder with a rubber dropper, and keep stirring, Until the ZSM-5 molecular sieve powder becomes viscous, stop adding the active comp...

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Abstract

The invention relates to a catalyst, and especially relates to an SCR catalyst for ship diesel engine post-treatment, and a preparation method thereof. The catalyst adopts a ZSM-5 molecular sieve with a high specific surface area as a supporter, and adopts vanadium, tungsten, copper, manganese and cerium metal elements as active components. The specific surface area of the ZSM-5 molecular sieve with a high specific surface area is above 500m<2> / g, and the specific pore volume of the ZSM-5 molecular sieve with a high specific surface area is above 0.6mL / g. The preparation method comprises the following steps: preprocessing ZSM-5 molecular sieve powder with a high specific surface area to remove superfluous water in the molecular sieve powder; mixing the active components with water to obtain an active component solution, wherein the volume of water is the product of the mass of the ZSM-5 molecular sieve and the specific pore volume of the ZSM-5 molecular sieve; adding the active component solution to the preprocessed ZSM-5 molecular sieve with a high specific surface area in a dropwise manner, and continuously stirring to obtain a viscous material; and heating the viscous material for drying, and calcining; and cooling. The catalyst has the advantages of high catalysis activity, high hydrothermal stability, high sulfur resistance, and wide active temperature window, and can guarantee that denitration of tail gas of ship diesel engines meets requirements of Tier III standards.

Description

technical field [0001] The invention relates to a catalyst, in particular to an SCR catalyst used for aftertreatment of marine diesel engines and a preparation method thereof. Background technique [0002] With the continuous increase in the number of transport ships, the pollution and harm caused by the pollutants discharged by ships to the atmosphere and water bodies are also becoming more and more serious. According to statistics, diesel-powered ships emit nitrogen oxides (NOx) into the atmosphere every year X ) about 6.5 million tons, sulfur oxides (SO X ) about 6 million tons, and particulate matter (PM) 1.7 million tons, causing serious air pollution, including air quality decline, greenhouse effect, acid rain and atmospheric ozone layer destruction, etc., and seriously endangering human health. The International Maritime Organization (IMO) has formulated a series of ship pollution prevention conventions to limit the emission of ship exhaust and strengthen the protec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01D53/94B01D53/56
CPCY02T10/12
Inventor 碗海鹰
Owner 碗海鹰
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