Diesel vehicle oxidation catalyst containing Al-Si-Ti composite oxide

A composite oxide, al-si-ti technology, used in physical/chemical process catalysts, molecular sieve catalysts, chemical/physical processes, etc., can solve the problems of uneven distribution, poor adsorption capacity of precious metals, etc. Simple method and precise control of the effect of precious metal distribution

Active Publication Date: 2014-10-29
WUXI WEIFU LIDA CATALYTIC CONVERTER
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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 solve the disadvantages that the existing diesel vehicle oxidation catalyst is not suitable for slurry mixed coating, poor adsorption capacity and uneven distribution of precious metals; it provides a simple preparation method, and the loading capacity of precious metals in the catalyst can be accurately controlled , Diesel vehicle oxidation catalyst with high catalyst activity

Method used

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  • Diesel vehicle oxidation catalyst containing Al-Si-Ti composite oxide
  • Diesel vehicle oxidation catalyst containing Al-Si-Ti composite oxide
  • Diesel vehicle oxidation catalyst containing Al-Si-Ti composite oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Preparation of an oxidation catalyst containing Al-Ti-Si composite oxide, the amount of precious metal added is 5g / ft 3 Calculated, noble metal Pt / noble metal Pd is 7 / 1, the coating amount is 80g / L, and the composition of Al-Ti-Si composite oxide is aluminum oxide, titanium dioxide, silicon dioxide with a mass ratio of 0.5:0.2:0.05 , including the following steps:

[0020] (1) Slurry preparation: mix TiO 2 , Al-Ti-Si composite oxide, ZSM-5 molecular sieve, zirconium dioxide, citric acid, platinum nitrate solution, and palladium nitrate solution are added to deionized water, and the mass ratio is 0.3:0.2:0.35:0.1:0.05:0.01399 : 0.001826, stir well;

[0021] (2) Slurry ball milling: the slurry is ground by a planetary ball mill, the rotation speed of the planetary ball mill is 250 rpm, the running time is 6h, the particle size of the slurry is 3.23um to D90, and the pH is 3.14;

[0022] (3) Determination of solid content: Take 10g of slurry in a dry pot, pla...

Embodiment 2

[0027] Example 2: Preparation of an oxidation catalyst containing Al-Ti-Si composite oxide, the amount of precious metal added is 34g / ft 3 Calculated, the ratio of noble metal Pt / noble metal Pd is 3 / 1, the coating amount is 120g / L, and the composition of Al-Ti-Si composite oxide is aluminum oxide, titanium dioxide, silicon dioxide with a mass ratio of 0.6:0.3: 0.1, including the following steps:

[0028] (1) Slurry preparation: mix TiO 2 , Al-Ti-Si composite oxide, ZSM-5 molecular sieve, zirconium dioxide, citric acid, platinum nitrate solution, and palladium nitrate solution are added to deionized water, and the ratio is 0.37:0.35:0.25:0.02:0.01:0.0891: 0.03599, fully stir evenly;

[0029] (2) Slurry ball mill: the slurry is ground by a planetary ball mill, the rotation speed of the planetary ball mill is 330 rpm, the running time is 4h, the particle size of the slurry is 3.33um to D90, and the pH is 3.23;

[0030] (3) Determination of solid content: Take 10g of slurry in ...

Embodiment 3

[0035] Example 3: Preparation of an oxidation catalyst containing Al-Ti-Si composite oxide, the amount of precious metal added is 200g / ft 3 Calculated, the noble metal Pt / noble metal Pd is 2 / 1, the coating amount is 180g / L, and the composition of the Al-Ti-Si composite oxide is aluminum oxide, titanium dioxide, and silicon dioxide with a mass ratio of 0.7:0.4: 0.2, including the following steps:

[0036] (1) Slurry preparation: mix TiO 2 , Al-Ti-Si composite oxide, ZSM-5 molecular sieve, zirconium dioxide, citric acid, platinum nitrate solution, palladium nitrate solution are added to deionized water, the ratio is 0.2:0.29:0.45:0.03:0.03:0.31076: 0.18818, fully stir evenly;

[0037](2) Slurry ball mill: the slurry is ground by a planetary ball mill, the rotating speed of the planetary ball mill is 380 rpm, the running time is 3h, the particle size of the slurry is 3.13um, and the measured pH is 3.17;

[0038] (3) Determination of solid content: Take 10g of slurry in a dry p...

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PUM

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Abstract

The invention relates to a diesel vehicle oxidation catalyst containing Al-Si-Ti composite oxide. The diesel vehicle oxidation catalyst is prepared by taking cordierite honeycomb ceramics as a carrier, TiO2 and Al-Ti-Si composite oxide as a dispersing agent, a molecular sieve as adsorbing material, zirconium nitrate as a thermal stabilizing auxiliary agent, citric acid as a binding agent and precious metals Pt and Pd as active components; the feeding amount of the precious metals is 5-200g/ft<3>. The preparation method is simple; the prepared catalyst are coated by the precious metal active components by a mixed coating method, so that the content of the precious metals can be accurately controlled, the precious metals are evenly distributed, and the effect of the catalyst is better.

Description

technical field [0001] The invention relates to a diesel vehicle oxidation catalyst containing Al-Si-Ti composite oxide, belonging to the technical field of diesel vehicle oxidation catalyst preparation. Background technique [0002] Diesel vehicle oxidation catalyst (DOC) is used to oxidize part of CO, NO, HC and PM in the exhaust gas of diesel vehicles soluble in SOF. Its coating is mainly composed of oxide coating and active precious metal components. The precious metal is oxidized The key component of the catalyst, for diesel vehicle DOC, is to use DOC to reduce the activation energy of the chemical reactions of HC, CO and SOF in the exhaust gas of the diesel engine, so that these substances can interact with the oxygen in the exhaust gas at a lower temperature Oxidation reaction to convert to CO 2 and H 2 O. [0003] Oxygen-diesel vehicle exhaust gas purification catalysts generally include two parts: a carrier and an active coating. Most of the traditional diesel v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01D53/94B01D53/72B01D53/62B01D53/56
Inventor 杨金王刚刘洋贾莉伟鲍展栋
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER
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