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Method for preparing monolithic catalyst for purification of diesel exhaust

A monolithic catalyst and exhaust gas purification technology, applied in catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc., to achieve the effect of simple preparation process, good cycle stability and high NOx removal activity

Inactive Publication Date: 2010-08-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In-situ hydrothermal synthesis technology directly synthesizes molecular sieves on honeycomb cordierite carrier technology. There are related patents and literature reports. However, metal and SAPO-34 are simultaneously loaded on honeycomb cordierite by using in-situ hydrothermal synthesis technology. A new preparation method has not yet been reported in the literature

Method used

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  • Method for preparing monolithic catalyst for purification of diesel exhaust
  • Method for preparing monolithic catalyst for purification of diesel exhaust

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Step A: Vector pretreatment

[0026] The honeycomb cordierite support was treated with 15% dilute nitric acid solution at 80°C for 2h. After washing with distilled water, dry at 110°C for 3 hours to obtain a cordierite carrier;

[0027] Step B: Preparation of Molecular Sieve Mother Liquor

[0028] Add 12.32ml of phosphoric acid to 180ml of distilled water to obtain a phosphoric acid solution, add 1.2728g of copper oxide to the phosphoric acid solution, stir for 30min in a constant temperature water bath at 80°C, and cool to room temperature to obtain a solution (a); add 14.3520g of aluminum hydroxide to the solution In (a), stir vigorously for 30 minutes, then add 30% 6.52ml of silica sol and 21.79ml of morpholine, keep stirring evenly to obtain the molecular sieve mother liquor;

[0029] Step C: Synthesis of Monolithic Catalysts

[0030] Put the cordierite carrier obtained in step A into the bottom bracket of the reactor, then add the mother liquid of molecular siev...

Embodiment 2

[0034] Step A: Vector pretreatment

[0035] The honeycomb cordierite support was treated with 15% dilute nitric acid solution at 80°C for 2.5h. After washing with distilled water, dry at 110°C for 3 hours to obtain a cordierite carrier;

[0036] Step B: Preparation of Molecular Sieve Mother Liquor

[0037] Add 10.95ml of phosphoric acid to 180ml of distilled water to obtain a phosphoric acid solution; add 12.4462g of aluminum hydroxide to phosphoric acid, stir vigorously for 30min, then add 30% of 4.89ml of silica sol and 20.00ml of morpholine, keep stirring evenly to obtain a molecular sieve mother liquor;

[0038] Step C: Synthesis of Monolithic Catalysts

[0039] Put the cordierite carrier obtained in step A into the bottom bracket of the reactor, then add the mother liquid of molecular sieve obtained in step B into the reactor, and crystallize at 180° C. for 7 days. After the formed catalyst was rinsed with distilled water, it was dried at 110° C. for 3 hours, and then ...

Embodiment 3

[0043] Step A: Vector pretreatment

[0044] The honeycomb cordierite support was treated with 15% dilute nitric acid solution at 80°C for 2h. After washing with distilled water, dry at 110°C for 3 hours to obtain a cordierite carrier;

[0045] Step B: Preparation of Molecular Sieve Mother Liquor

[0046] Add 13.69ml of phosphoric acid to 180ml of distilled water to obtain a phosphoric acid solution, add 1.9092g of copper oxide to the phosphoric acid solution, stir for 30min in a constant temperature water bath at 80°C, and cool to room temperature to obtain a solution (a); add 15.6000g of aluminum hydroxide to the solution In (a), stir vigorously for 30min, then add 30% of 8.15ml silica sol and 22.66ml morpholine, keep stirring evenly to obtain molecular sieve mother liquor;

[0047] Step C: Synthesis of Monolithic Catalysts

[0048] Put the cordierite carrier obtained in step A into the bottom bracket of the reactor, then add the mother liquor of molecular sieve obtained i...

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Abstract

The invention discloses a method for preparing a monolithic catalyst for the purification of diesel exhaust, which is to synthesize metal active ingredients and SAPO-34 molecular sieves directly by an assisted hydrothermal synthesis method and load the metal active ingredients and the SAPO-34 molecular sieves on honeycomb carriers. The method comprises the following steps of: treating cordierite honeycomb ceramic carriers with a dilute nitric acid, eluting the mixture with distilled water and drying the mixture; adding a metal oxide into a phosphoric acid, stirring the solution to dissolve the metal oxide, adding an aluminum source, a silicon source and organic template into the solution and stirring the solution to obtain the mother liquor of molecular sieves; putting the cordierite honeycomb ceramic carriers and the mother liquor of molecular sieves in a reaction kettle for hydrothermal synthesis; rinsing and drying the mixture after crystallization; and preparing the catalyst by roasting crystals in an oxygen-containing atmosphere. Compared with the conventional methods for preparing catalysts, the method of the invention has a simple preparation process and can accurately control the content of the metal active ingredients. The prepared monolithic catalyst has high NOx removal activity and high recycling stability.

Description

technical field [0001] The invention relates to a preparation method of a monolithic catalyst for diesel locomotive exhaust purification, in particular, a method for loading metal active component precursors and SAPO-34 molecular sieves on honeycomb cordierite through in-situ hydrothermal synthesis for use in diesel locomotives A method for preparing a monolithic catalyst for tail gas purification. Background technique [0002] Diesel engine has excellent power and economy, and is a mainstream direction of motor vehicle development. At the same time, diesel vehicles have become one of the main sources of nitrogen oxides and particulate matter emissions in the urban atmosphere. The actual "air-fuel ratio" of a diesel engine is much greater than its theoretical "air-fuel ratio". Gasoline engines are roughly in the same order of magnitude, CO and HC emissions are significantly lower than gasoline engines, and particulate matter emissions are about dozens of times that of gaso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J37/10B01D53/94B01D53/56B01D53/72
Inventor 王建成常丽萍韩丽娜鲍为仁唐磊
Owner TAIYUAN UNIV OF TECH
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