Diesel engine exhaust SCR denitration catalyst and preparation method thereof

A diesel engine and catalyst technology, which is applied in the fields of environmental protection catalytic materials and air pollution control, to achieve the effects of high cost performance, reduction of ammonia escape, and excellent resistance to sulfur and water poisoning.

Active Publication Date: 2016-05-11
南京环福新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose an environment-friendly low-cost catalyst for denitrification of diesel engine exhaust in view of the current situation and exis

Method used

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  • Diesel engine exhaust SCR denitration catalyst and preparation method thereof
  • Diesel engine exhaust SCR denitration catalyst and preparation method thereof
  • Diesel engine exhaust SCR denitration catalyst and preparation method thereof

Examples

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Effect test

example 1

[0031] (1) Preparation of cerium-molybdenum composite oxide precursor

[0032] Measure 0.35g of pseudo-boehmite, add 3.25g of deionized water and stir evenly, then dropwise add 0.18g of nitric acid to obtain a stable aluminum gel, place it in a constant temperature water bath at 80°C and stir for 20 minutes to degelatinize, and obtain an aluminum sol. Then weigh 19.2g of cerium nitrate hexahydrate, dissolve it in a water bath at 80°C and stir to form a clear solution, mix it with aluminum sol, and stir for 20 minutes;

[0033] According to the molar ratio of Ce / Mo element is 1:0.1, weigh 0.78g ammonium molybdate tetrahydrate and 0.78g citric acid monohydrate and add 2.34g deionized water to mix, then stir evenly until the solution is clear and transparent, then add dropwise to In the cerium solution, stirring is required during the dropping process;

[0034] (2) Co-catalyst precursor ion solution configuration

[0035] Weigh 1.58g of praseodymium nitrate hexahydrate and add ...

example 2

[0043] (1) Preparation of cerium-molybdenum composite oxide precursor

[0044] Measure 0.5g of pseudo-boehmite, add 7.0g of deionized water and stir evenly, then dropwise add 0.3g of nitric acid to obtain a stable aluminum gel, place it in a constant temperature water bath at 80°C and stir for 25 minutes to degelatinize, and obtain an aluminum sol. Then weigh 19.2g of cerium nitrate hexahydrate, dissolve it in a water bath at 85°C and stir to form a clear solution, mix it with aluminum sol, and stir for 25 minutes;

[0045] According to the molar ratio of Ce / Mo element is 1:0.15, weigh 1.17g of ammonium molybdate and 1.46g of citric acid monohydrate and add 5.62g of deionized water to mix, then stir evenly until the solution is clear and transparent, and then add it dropwise to the cerium solution During the dropwise addition, stirring is required;

[0046] (2) Co-catalyst precursor ion solution configuration

[0047] Weigh 2.95g of praseodymium nitrate hexahydrate and add 5...

example 3

[0055] (1) Preparation of cerium-molybdenum composite oxide precursor

[0056] Measure 0.5g of pseudo-boehmite, add 7.0g of deionized water and stir evenly, then dropwise add 0.3g of hydrochloric acid to obtain a stable aluminum gel, place it in a constant temperature water bath at 80°C and stir for 30 minutes to degelatinize, and obtain an aluminum sol. Then weigh 10.89g of cerium chloride, dissolve it in a water bath at 80°C and stir to form a clear solution, mix it with aluminum sol, and stir for 30 minutes;

[0057] According to the Ce / Mo molar ratio of 1:0.4, weigh 2.94g of ammonium paramolybdate and 2.94g of citric acid monohydrate and add 10.92g of deionized water to mix, then stir evenly until the solution is clear and transparent, and then add it dropwise to the cerium In the solution, stirring is required during the dropping process;

[0058] (2) Co-catalyst precursor ion solution configuration

[0059] Weigh 2.37g of praseodymium chloride and add 9.30g of deionize...

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Abstract

The present invention relates to a diesel engine exhaust SCR denitration catalyst and a preparation method thereof, a cerium molybdenum complex oxide is used as a catalytically active component, praseodymium, tungsten or lanthanum is used as a cocatalyst blend, and alumina is used as a carrier. The cerium molybdenum complex oxide, a co-catalysis ion precursor complex solution, pseudo-boehmite, pure gamma alumina, citric acid monohydrate and other organic additives are uniformly stirred, mixed, decayed, extruded and molded, then dried in the shade, dried, and roasted to obtain an integrated catalyst. The catalyst is environment-friendly, high in NOx removal efficiency, and wide in range of active temperature, NOx removal efficiency at 250 DEG C-425 DEG C is more than 95%, the highest denitration activity is up to 100%; and the diesel engine exhaust SCR denitration catalyst has excellent sulfur resistance, water poisoning resistance, high mechanical strength, good ammonia storage performance, high CO and HC catalytic oxidation activity and low catalyst cost, and is cost-effective, and especially suitable for diesel engine exhaust NOx removal.

Description

technical field [0001] The invention relates to a catalyst for denitrification of diesel engine tail gas and a preparation method thereof, which belongs to the fields of environmental protection catalytic materials and air pollution control, and is particularly suitable for denitrification of tail gas with high sulfur content of marine diesel engines. Background technique [0002] The International Maritime Organization (IMO) has decided that according to international treaties, nitrogen oxides (NOx) emitted by ships will be x ) to implement the third-stage emission limit. The reduction of NOx emissions has been significantly increased by about 80% compared with the first limit value in 2005. NO x It has become the focus of the country's "Twelfth Five-Year Plan" emission reduction. There are many inland ships in my country, with intensive berthing, and the ship diesel engine is NO x Emissions are basically in an uncontrolled state, with NO x The total discharge is as hi...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01D2258/012B01J23/002B01J23/28B01J23/30B01J2523/00B01J2523/31B01J2523/3712B01J2523/3718B01J2523/68B01J2523/69B01J2523/3706
Inventor 沈岳松严巍祝社民
Owner 南京环福新材料科技有限公司
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