Catalyst suitable for processing tail gas of lean-burn natural gas vehicle and preparation method thereof

A technology for exhaust gas treatment and catalyst, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as affecting catalyst performance, and achieve easy control of preparation process conditions. , the preparation method is simple, the practicability is strong

Active Publication Date: 2013-03-20
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this literature does not study in depth which elements affect the structure and properties of the support material, thereby affecting the performance of the catalyst.

Method used

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  • Catalyst suitable for processing tail gas of lean-burn natural gas vehicle and preparation method thereof
  • Catalyst suitable for processing tail gas of lean-burn natural gas vehicle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 10%Ce / γ-Al 2 o 3 Preparation of Supported Catalyst Containing 2.0%Pd

[0028] Weigh cerium nitrate [Ce(NO 3 ) 3 .6H 2 O]251.28g, γ-Al 2 o 3 880.00g. [Ce(NO 3 ) 3 .6H 2 O] 251.28g was dissolved in 600g deionized water, stirred and dissolved to a clear solution. γ-Al 2 o 3 Add 880.00g into the dissolved cerium nitrate solution, stir evenly and let stand for 1 hour, then vacuum dry at 80°C for 8 hours, and calcinate at 600°C for 3 hours to obtain Ce / γ-Al 2 o 3 pink. Weigh palladium nitrate [Pd(NO 3 ) 2 ]127.15g was added to 533.33g deionized water, stirred evenly, and the Ce / γ-Al 2 o 3 Add the powder into the palladium nitrate solution, stir rapidly and place it for 1 hour. Then vacuum dry at 80°C for 8 hours, and calcined at 550°C for 2 hours to obtain Pd / Ce / γ-Al 2 o 3 powder (for earthy yellow powder). A binder is added to the khaki powder to prepare a slurry, which is coated on a hole with a mesh number of 400cell / in 2 , with a volume of 2.5ml on ...

Embodiment 2

[0030] 10%Ce / γ-Al2 o 3 Preparation of Supported Catalyst Containing 2.0%Pt

[0031] Ce / γ-Al 2 o 3 The preparation is the same as in Example 1. Weigh palladium nitrate [Pt(NO 3 ) 2 ]65.57g was added to 533.33g deionized water, stirred evenly, and the Ce / γ-Al 2 o 3 Add the powder into the palladium nitrate solution, stir rapidly and place it for 1 hour. Then vacuum-dried at 80°C for 8 hours and calcined at 550°C for 2 hours to obtain Pt / Ce / γ-Al 2 o 3 powder (for earthy yellow powder). A binder is added to the khaki powder to prepare a slurry, which is coated on a hole with a mesh number of 400cell / in 2 , with a volume of 2.5ml on a cordierite ceramic honeycomb carrier, dry and calcined, that is, the precious metal content is 80g / ft 3 single platinum catalyst.

Embodiment 3

[0033] 10%Zr / γ-Al 2 o 3 Preparation of Supported Catalyst Containing 2.0%Pd

[0034] Weigh zirconium nitrate [Zr(NO 3 ) 4 .3H 2 O]333.33g, γ-Al 2 o 3 880.00g. [Zr(NO 3 ) 4 .3H 2 O] 333.33g was dissolved in 600g deionized water, stirred and dissolved to a clear solution. All the other steps are the same as in Example 1, and the available precious metal content is 80g / ft 3 single palladium catalyst.

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Abstract

The invention discloses a catalyst suitable for processing the tail gas of a lean-burn natural gas vehicle and a preparation method thereof. The catalyst is prepared through the following steps of: loading rare earth metal on a carrier gamma-AL2O3, painting precious metal, and drying and calcining carrier gamma-AL2O3 coated with the precious metal, wherein the precious metal is Pt and/or Pd, and the rare earth metal is Zr, Y, La and/or Ce; the weight percentage of the precious metal is 2.0%, wherein the weight ratio of Pt to Pd is (1-0):(0-1); and the weight percentage of the rare earth metal Zr is 10%, the weight percentage of the rare earth metal Y is 0-10%, the weight percentage of the rare earth metal La is 0-10%, and the weight percentage of the rare earth metal Ce is 0-10%. The preparation method of the catalyst, which is disclosed by the invention, has the advantages of simplicity, easiness in controlling the preparation process conditions, and high practicability. Through the detection, the catalyst has favorable CH4 conversion performance, and has a favorable effect in processing the tail gas of lean-burn natural gas vehicles so as to enable the tail gas to meet various corresponding national standards and requirements.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to the technical field of complete purification catalyst preparation, and relates to a catalyst suitable for treating exhaust gas of lean-burn natural gas vehicles and a preparation method thereof. Background technique [0002] With the increasingly urgent energy and environmental issues, in order to protect the environment and save energy, people put forward higher requirements for the emission control of motor vehicle exhaust. my country is relatively rich in natural gas. Many urban buses and taxis use natural gas as fuel. In addition, natural gas, as a development energy, will also be widely used in motor vehicle fuel in the future. Therefore, it is imperative to strengthen the research on after-treatment technology to control the exhaust emission of natural gas vehicles, and it is particularly important to use the catalyst as the core component of after-treatment te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01D53/72
Inventor 李大成吴冬冬陈耀强李云
Owner SINOCAT ENVIRONMENTAL TECH
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