Oxidation catalyst for purifying exhaust gas of diesel engine and preparation method thereof

A technology for oxidation catalysts and diesel engines, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc. It can solve the problems of unfavorable catalyst promotion and application and industrialization, catalyst cost increase, and high loading capacity, so as to prolong the service life, The effect of improving conversion efficiency and increasing storage capacity

Inactive Publication Date: 2017-02-01
桐城市宇洁机动车尾气检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has a good purification effect on CO, HC and SOF, and can also oxidize part of NO at the same time. However, there are many types of active component noble metals and high loading capacity, which greatly increases the cost of the catalyst, which is not conducive to the popularization and application of the catalyst. industrialization

Method used

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  • Oxidation catalyst for purifying exhaust gas of diesel engine and preparation method thereof
  • Oxidation catalyst for purifying exhaust gas of diesel engine and preparation method thereof
  • Oxidation catalyst for purifying exhaust gas of diesel engine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 12.5 parts by mass of pseudo-boehmite in 375 parts by mass of deionized water, and stir for 15 minutes at a speed of 600r / min; then add 99 parts by mass of activated alumina and 50 parts by mass of Mn-Cr composite Oxide, stir for 30 minutes to mix evenly, adjust the pH of the mixture to 3.5 with acetic acid; transfer the evenly mixed mixture to a ball mill, set the ball mill speed to 1000r / min, grind for 30 minutes, and then move it out to the batching container; Add 40 parts by mass of β molecular sieve to the good mixture, stir for 60 minutes and mix well.

[0027] Calculate according to the mass percentage of precious metal Pt in the catalyst as 0.5% and weigh 13.6 parts by mass of platinum nitrate solution with 10% mass concentration of Pt, and slowly add it to the ground mixture at a speed of 600r / min Stir for 60 minutes to prepare coating liquid.

[0028] Put the cordierite honeycomb ceramic carrier of Ф118.4*152.4mm and 400 / 6.5 on the coating device to coat the c...

Embodiment 2

[0031] Mix 36.25 parts by mass of pseudo-boehmite in 375 parts by mass of deionized water, stir for 15 minutes at a speed of 600r / min; then add 70 parts by mass of activated alumina and 30 parts by mass of Mn-Cr composite Oxide, stir for 30 minutes to mix evenly, adjust the pH of the mixture to 3.5 with acetic acid; transfer the evenly mixed mixture to a ball mill, set the ball mill speed to 1000r / min, grind for 30 minutes, and then move it out to the batching container; Add 70 parts by mass of β molecular sieve to the good mixture, stir for 60 minutes and mix well.

[0032] Calculate according to the mass percentage of precious metal Pt in the catalyst as 0.5% and weigh 13.6 parts by mass of platinum nitrate solution with 10% mass concentration of Pt, and slowly add it to the ground mixture at a speed of 600r / min Stir for 60 minutes to prepare coating liquid.

[0033] Put the cordierite honeycomb ceramic carrier of Ф118.4*152.4mm and 400 / 6.5 on the coating device to coat the coat...

Embodiment 3

[0036] Mix 25 parts by mass of pseudo-boehmite in 375 parts by mass of deionized water and stir for 15 minutes at a speed of 600r / min; then add 99 parts by mass of activated alumina and 40 parts by mass of Mn-Cr composite oxide to it, Stir for another 30 minutes to mix evenly, adjust the pH of the mixture to 3.5 with acetic acid; transfer the evenly mixed mixture to a ball mill, set the speed of the ball mill to 1000r / min, grind for 30 minutes, and move it out to the batching container; Add 40 parts by mass of β molecular sieve to the solution, stir for 60 minutes and mix well.

[0037] Calculate according to the mass percentage of precious metal Pt in the catalyst as 0.5% and weigh 13.6 parts by mass of platinum nitrate solution with 10% mass concentration of Pt, and slowly add it to the ground mixture at a speed of 600r / min Stir for 60 minutes to prepare coating liquid.

[0038] Put the cordierite honeycomb ceramic carrier of Ф118.4*152.4mm and 400 / 6.5 on the coating device to c...

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Abstract

The invention provides an oxidation catalyst for purifying the exhaust gas of a diesel engine and a preparation method thereof, belonging to the technical field of treatment of automobile exhaust. The catalyst is composed of iolite cellular ceramic or metal used as a carrier and an active coating containing active alumina, composite oxide, a molecular sieve and a precious metal. The preparation method comprises the following steps: subjecting pseudo-boehmite, alumina and composite oxide to mixing in deionized water under stirring and then carrying out ball milling; adding solutions of the molecular sieve and the precious metal so as to prepare a liquid coating material; and coating the carrier with the liquid coating material and carrying out drying and roasting. The diesel oil oxidation catalyst provided by the invention has good purifying effect on CO, HC and SOF; and the catalyst has good low-temperature oxidation performance through addition of composite oxide containing Mn and reduction in the oxidation temperature of NO.

Description

Technical field [0001] The present invention relates to a catalyst in the technical field of automobile exhaust gas treatment and its preparation, in particular to a targeted removal of NOx, HC and their mixtures, CO, SOF, etc. in diesel engine exhaust gas and has good NO low-temperature oxidation ability Diesel oxidation catalyst and its preparation method. Background technique [0002] With the increasing shortage of global oil resources and CO 2 The pressure to reduce emissions has increased, and there is a trend of diesel engineization of vehicle power in foreign countries. Europe and Japan have taken the lead in realizing the diesel engineization of trucks and large passenger cars. Diesel engine emissions are a complex mixture of gaseous, liquid and solid substances. The main harmful exhaust emissions include HC, CO, NOx, PM and soot. The concentration of NOx in diesel vehicle exhaust is equivalent to that of gasoline engines, and PM is dozens of times that of gasoline engi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01D53/94
CPCB01J29/7815B01D53/9413B01D53/944B01D2255/1021B01D2255/2073B01D2255/20784B01D2255/502B01D2258/01B01D2258/012B01J37/0232
Inventor 胡雪林
Owner 桐城市宇洁机动车尾气检测有限公司
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