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Integral DOC catalyst for marine diesel engine tail gas purification and preparation process thereof

A marine diesel engine and exhaust gas purification technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of high sulfate content, achieve high catalytic activity, Strong aging resistance and uniform coating distribution

Active Publication Date: 2016-09-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above problems, the present invention provides a preparation process for an integral DOC catalyst used for marine diesel engine tail gas purification. The DOC catalyst produced by this process can better adapt to the special working conditions of marine diesel engine tail gas treatment and can effectively improve catalyst performance. Problems of poisoning, blockage of catalytic carrier channels, and high sulfate content in exhaust gas

Method used

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  • Integral DOC catalyst for marine diesel engine tail gas purification and preparation process thereof
  • Integral DOC catalyst for marine diesel engine tail gas purification and preparation process thereof
  • Integral DOC catalyst for marine diesel engine tail gas purification and preparation process thereof

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Embodiment 1

[0039] Embodiment 1 Preparation containing cerium-palladium DOC catalyst

[0040] A preparation process for an integral DOC catalyst for marine diesel engine tail gas purification, the specific steps of the process are as follows:

[0041] 1) Pretreatment: Soak the cordierite honeycomb ceramic carrier in 20%wt oxalic acid solution at 60°C for 3 hours.

[0042] 2) Preparation of active component slurry:

[0043] The formulation of the active ingredient paste is:

[0044] Pseudoboehmite (calculated by alumina mass) accounting for 9%wt of the slurry, cerium oxide powder accounting for 2.7%wt of the slurry, urea accounting for 2.25%wt of the slurry, palladium (Pd) accounting for 1.5%wt of the slurry );

[0045] Nitric acid, the addition of nitric acid is to make the amount of hydrogen ion material reach 8% of pseudo-boehmite, even if n(H+) / n(Al)=0.08 in the slurry;

[0046] Account for the citric acid of slurry 3%wt;

[0047] The remaining components are deionized water;

[...

Embodiment 2

[0063] Example 2 Preparation of DOC catalyst containing cerium-zirconium-palladium:

[0064] A preparation process for an integral DOC catalyst for marine diesel engine tail gas purification, the specific steps of the process are as follows:

[0065] 1) Pretreatment: Soak the cordierite honeycomb ceramic carrier in 20%wt oxalic acid solution at 60°C for 3 hours.

[0066] 2) Preparation of active component slurry:

[0067] The formulation of the active ingredient paste is:

[0068] Pseudoboehmite (calculated by alumina mass) accounting for 9%wt of slurry, cerium oxide and 0.81%wt of zirconia powder accounting for 2.7%wt of the total mass of slurry, urea accounting for 2.25%wt of slurry, accounting for Palladium (Pd) of slurry 1.5%wt;

[0069] Nitric acid, the addition of nitric acid is to make the amount of hydrogen ion material reach 8% of pseudo-boehmite, even if n(H+) / n(Al)=0.08 in the slurry;

[0070] Attapulgite accounting for 1%wt of slurry;

[0071] The remaining co...

Embodiment 3

[0082] A monolithic DOC catalyst for exhaust purification of marine diesel engines, the catalyst uses cordierite honeycomb ceramics as a carrier, and the mass of cordierite honeycomb ceramics is 100%, and the content of active components loaded on the cordierite honeycomb ceramic carrier is : 3.5% palladium, 5.5% cerium oxide, 1% zirconia.

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Abstract

The invention relates to the technical field of marine diesel engine tail gas post-treatment, in particular to an integral DOC catalyst for marine diesel engine tail gas purification and a preparation process thereof. The integral DOC catalyst for marine diesel engine tail gas purification takes cordierite honeycomb ceramic as the carrier, in terms of 100% of the mass of the cordierite honeycomb ceramic, the active components loaded on the cordierite honeycomb ceramic carrier includes: greater than or equal to 3%wt of palladium, and greater than or equal to 6%wt of the sum of cerium oxide and zirconium oxide. The DOC catalyst can well adapt to the special work conditions of marine diesel engine tail gas treatment, and also can effectively improve the problems of catalyst poisoning, catalytic carrier channel blockage, and high sulfate content of the tail gas.

Description

technical field [0001] The invention relates to the technical field of marine diesel engine tail gas post-treatment, in particular to an integral DOC catalyst used for purification of marine diesel engine tail gas and a preparation process thereof. Background technique [0002] Diesel engines are widely used in the fields of transportation, agricultural machinery and construction machinery with good economy and power. Diesel engine exhaust mainly includes carbon monoxide (CO), hydrocarbons (HC), sulfur dioxide (SO 2 ), aldehydes, particulate matter (PM) and nitrogen oxides (NOx) and other harmful substances. In recent years, with the continuous increase in the number and carrying capacity of transport ships, the pollution and harm caused by the pollutants discharged by ships to the atmosphere and water bodies have become increasingly serious. According to statistics, diesel-powered ships emit nitrogen oxides (NOx) into the atmosphere every year X ) about 6.5 million tons,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/44B01D53/94B01D53/72B01D53/56
CPCB01D53/94B01D53/9413B01D2255/1023B01D2255/2065B01D2255/20715B01D2255/407B01J23/44B01J23/63
Inventor 高翔竺新波郑成航岑可法骆仲泱倪明江周劲松翁卫国吴卫红张涌新宋浩王耀霖赵昊鹰
Owner ZHEJIANG UNIV
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