Integral diesel vehicle tail gas oxidization catalyst and preparation method thereof

An oxidation catalyst, a technology for diesel vehicles, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of pore structure collapse, catalyst activity decline, catalytic activity reduction and other problems, and achieve good catalytic oxidation activity and The effect of thermal stability

Active Publication Date: 2019-04-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the DPF fuel injection regeneration process, the exhaust gas temperature will rise sharply, the DOC outlet temperature will be as high as 650 ° C, and the Pt catalytic active component or carrier will be sintered, which will lead to a decrease in catalyst activity.
Pt particles with good initial dispersion, aggregate or grain growth at high temperature, resulting in reduced surface active sites and reduced catalytic activity
At the same time, the sintering of the carrier will cause the collapse of the pore structure and the reduction of active sites, and the existing DOC catalysts cannot meet the demand

Method used

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  • Integral diesel vehicle tail gas oxidization catalyst and preparation method thereof
  • Integral diesel vehicle tail gas oxidization catalyst and preparation method thereof
  • Integral diesel vehicle tail gas oxidization catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides Pt / Y 2 o 3 / SiO 2 -Al 2 o 3 The preparation method of catalyst comprises the following steps:

[0023] (1) the calculated amount of yttrium nitrate (15wt% Y 2 o 3 ) was dissolved in deionized water and impregnated in SiO by the isoporous volume impregnation method 2 -Al 2 o 3 On the carrier, let stand for 2h;

[0024] (2) Place the sample obtained in (1) in a drying oven to dry at 60°C for 12 hours, and then bake it in a roasting furnace at 550°C for 3 hours to obtain Y 2 o 3 / SiO 2 -Al 2 o 3 Modified carrier powder;

[0025] (3) Properly dilute the platinum nitrate solution (1wt% Pt), and impregnate the Y obtained in (2) by the isoporous volume impregnation method. 2 o 3 / SiO 2 -Al 2 o 3 Powder, dry, roast the same as (2) to get Pt / Y 2 o 3 / SiO 2 -Al 2 o 3 Catalyst powder material;

[0026] (4) Grinding the catalyst powder material obtained in (3) with 2-5wt% aluminum sol and 2-5wt% acetic acid to make a catalyst slurry...

Embodiment 2

[0030] (1) The calculated amount of Ca(NO 3 ) 2 (10wt% CaO) was dissolved in deionized water and impregnated in SiO 2 -Al 2 o 3 On the support, drying, roasting (same as the step (2) of embodiment 1), make CaO / SiO 2 -Al 2 o 3 carrier material;

[0031] (2) According to the same method of embodiment 1 step (3), impregnate the platinum nitrate solution in the CaO / SiO prepared by (1) 2 -Al 2 o 3 On the carrier material, dry and calcined to obtain Pt / CaO / SiO 2 -Al 2 o 3 catalyst powder;

[0032] (3) According to the same method of steps (4) in Example 1, (5) and (6), the monolithic Pt / CaO / SiO is prepared 2 -Al 2 o 3 catalyst.

Embodiment 3

[0034] (1) Mn(NO 3 ) 2 Solution (15wt%MnO 2 ) isoporous volume method impregnated in SiO 2 -Al 2 o 3 On the carrier, drying, roasting and (the same method as step (2) of Example 1), obtain MnO x / SiO 2 -Al 2 o 3 carrier material;

[0035] (2) According to the same method of embodiment 1 step (3), impregnate the platinum nitrate solution in the CaO / SiO prepared by (1) 2 -Al 2 o 3 On the carrier material, dry and calcined to obtain Pt / MnO x / SiO 2 -Al 2 o 3 catalyst powder;

[0036] (3) According to the same method of steps (4) in Example 1, (5) and (6), the monolithic Pt / MnO is prepared x / SiO 2 -Al 2 o 3 catalyst.

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Abstract

The invention discloses an integral diesel vehicle tail gas oxidization catalyst and a preparation method thereof. The preparation method comprises the following steps: loading noble metal on a SiO2-Al2O3 carrier modified by an auxiliary agent to obtain a catalyst powder material; and coating a cordierite matrix with the catalyst powder material to prepare the integral diesel vehicle tail gas oxidization catalyst, wherein the mass percent content of SiO2 in the carrier is 10 to 30 weight percent, noble metal is Pt and/or Pd and the total loading amount is 1 to 3 weight percent. The SiO2-Al2O3carrier is prepared by modifying through auxiliary agents including rare earth metal, alkaline earth metal and the like; and a DOC (Diesel Oxidation Catalyst) prepared from the carrier can be used forimproving the activity of CO, HC, SOF and NO and high-temperature ageing resisting performance, especially the NO oxidation activity.

Description

technical field [0001] The invention belongs to the technical field of catalyst research and preparation. In particular, it belongs to the technical field of research and preparation of motor vehicle tail gas treatment catalysts, and in particular relates to an integral diesel vehicle tail gas oxidation catalyst and a preparation method thereof. Background technique [0002] Motor vehicle exhaust is one of the main sources of air pollutants, the main pollutants include: carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO x ) and particulate matter (PM). It not only causes serious environmental pollution, but also seriously endangers human health. Diesel vehicles have been widely used because of their fuel economy and high thermal efficiency. Diesel vehicle oxidation catalyst (DOC) mainly purifies carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx) and soluble organic components (SOF) on the surface of particulate matter (PM) in the exhaust gas of diese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/076B01D53/94B01D53/72B01D53/62B01D53/56
CPCB01D53/944B01D2257/502B01J29/076Y02A50/20
Inventor 王健礼梁艳丽陈耀强赵明
Owner SICHUAN UNIV
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