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Preparation and application of oxidation catalyst taking cerium-zirconium-silicon composite oxide as carrier

A technology of composite oxides and oxidation catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst carriers, etc., can solve high light-off temperature, low oxidation catalytic activity, and conversion Low-level problems, to achieve the effect of low ignition temperature, large specific surface area and high conversion rate

Inactive Publication Date: 2014-12-24
广州市威格林环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, oxidation catalysts for purifying diesel vehicle exhaust have low oxidation catalytic activity, low conversion rate and high light-off temperature for hydrocarbons and carbon monoxide in motor vehicle exhaust.

Method used

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  • Preparation and application of oxidation catalyst taking cerium-zirconium-silicon composite oxide as carrier
  • Preparation and application of oxidation catalyst taking cerium-zirconium-silicon composite oxide as carrier
  • Preparation and application of oxidation catalyst taking cerium-zirconium-silicon composite oxide as carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a diesel vehicle oxidation catalyst with cerium-zirconium-silicon composite oxide as a carrier, the specific preparation steps are as follows:

[0036] The cerium-zirconium-silicon composite oxide support material is prepared by hydrothermal synthesis: under the condition of stirring at room temperature, weigh 5g of cerous nitrate, 2.5g of zirconyl nitrate and 14g of silica sol with a content of 20% (wt) and mix evenly to form Mix the metal salt solution. Under the condition of vigorous stirring, add 2 mol / L ammonia solution dropwise into the metal salt solution until the pH value is 9.5 to stop the dropwise addition. ℃ hydrothermal reaction for 3h. Take it out and cool it down, vacuum filter the resulting precipitate, wash it with deionized water until it is neutral, dry it at 100°C in air atmosphere for 12h, put it in a muffle furnace and bake it at 500-1000°C in air atmosphere for 5h to get cerium Zirconium-silicon composite oxide, the result...

Embodiment 2

[0054] Concrete preparation method step is basically the same with activity evaluation experiment and implementation case 1, and difference is:

[0055] When preparing the cerium-zirconium-silicon composite oxide support material, under the condition of stirring at room temperature, weigh 13g of cerous nitrate, 7.5g of zirconyl nitrate and 35g of silica sol with a content of 20% (wt) and mix evenly to form a mixed metal salt solution . The cerium-zirconium-silicon composite oxide support material is obtained by calcination at 1000°C for 5 hours, and its specific surface area is 196.1m 2 / g, the pore volume is 0.39cm 3 / g, the average pore diameter is 6.4nm, and the catalyst obtained is denoted as Pt-CZS-A. Carry out the activity evaluation experiment such as embodiment 1 under the simulated atmosphere of diesel vehicle exhaust in the laboratory, the catalyst Pt-CZS-A prepared is to the CO catalytic oxidation activity in diesel vehicle exhaust see figure 1 , for C in diesel ...

Embodiment 3

[0057] The specific steps of the preparation method and the activity evaluation experiment are basically the same as those in Example 1, the difference is: when preparing the cerium-zirconium-silicon composite oxide carrier material, weigh 9g of cerous nitrate, 5g of zirconyl nitrate and stir at room temperature. Mix evenly with 24.5g content of 20% (wt) silica sol to form a mixed metal salt solution, the amount of noble metal added is 0.5% (wt) of the slurry, and the resulting catalyst is designated as Pt-CZS-1-F. Carry out the activity evaluation experiment as embodiment 1 under the simulated atmosphere of diesel vehicle exhaust in the laboratory, the catalyst Pt-CZS-1-F prepared is to the CO catalytic oxidation activity in diesel vehicle exhaust see figure 1 , for C in diesel vehicle exhaust 3 h 8 Catalytic oxidation activity see figure 2 , Table 2 lists the Pt-CZS-1-F catalyst for CO and C 3 h 8 Catalytic oxidation results, it was found from Table 2 that the Pt-CZS-1-...

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Abstract

The invention provides a preparation method of an oxidation catalyst taking a cerium-zirconium-silicon composite oxide as a carrier and application of the oxidation catalyst to the automotive vehicle emitted tail gas, and belongs to the technical field of automotive vehicle tail gas oxidation, catalysis and purification. The oxidation catalyst taking the cerium-zirconium-silicon composite oxide as the carrier is prepared by taking FeCrAl metal honeycomb or cordierite ceramic honeycomb as a matrix, taking a cerium-zirconium-silicon composite oxide as a coating and taking precious metal Pt and / or Pd as active substances. The carrier material of the prepared cerium-zirconium-silicon composite oxide is large in specific surface area, relatively large in pore volume and moderate in pore diameter, and is beneficial for increasing the active sites. For the hydrocarbon and the carbon monoxide in the automotive vehicle emitted tail gas, the prepared oxidation catalyst taking the cerium-zirconium-silicon composite oxide as the carrier has good oxidation catalytic activity, high conversion rate and low ignition temperature. At the same time, the preparation method is simple and suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of oxidation and catalytic purification of motor vehicle exhaust, and in particular relates to the preparation and application of an oxidation catalyst based on a cerium-zirconium-silicon composite oxide as a carrier. Background technique [0002] With the wide use of diesel engines in the world, the pollution of diesel exhaust emissions has also attracted widespread attention. Among the exhaust gas emitted by diesel engines, nitrogen accounts for about 75.2%, carbon dioxide accounts for about 7.1%, oxygen and other components account for about 16.89%, and harmful emissions account for about 0.81%. Among them, harmful emissions mainly include nitrogen oxides NO x (35.4%), carbon monoxide CO (35.3%), particulate matter PM and sulfur oxide SO x (20.76%), hydrocarbons HC (8.54%). Generally, the exhaust temperature of diesel vehicles is low, and the oxygen concentration in the exhaust gas is relatively high, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J32/00B01J35/10B01D53/62B01D53/72B01D53/94
CPCY02A50/20
Inventor 赵向云刘玉媚萧剑鸣范群
Owner 广州市威格林环保科技有限公司
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