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Method for preparing high-dispersion Pd/Ce-Zr/Al2O3 close coupled catalyst

A catalyst, high dispersion technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, separation method, etc., can solve the problem of low catalyst activity, low dispersion of catalyst active components, complete The problem of high oxidation temperature, to achieve the effect of improving catalytic activity and thermal stability, meeting emission requirements, and not easy to sinter and agglomerate

Inactive Publication Date: 2009-04-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion of active components of catalysts prepared by traditional impregnation methods is not high, and the activity of catalysts is relatively low. For alkanes (such as C 3 h 8 ) complete oxidation temperature is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1g palladium nitrate (Pd(NO 3 ) 2 2H 2 O) be placed in 200mL volumetric flask, add deionized water, be mixed with the active component precursor solution (solution A) that Pd concentration is 1.80g / mL. Weigh 1.115g Ce(NO 3 ) 3 ·6H 2 O and 0.551gZr(NO 3 ) 4 ·5H 2 O was placed in a beaker, and 15 mL of deionized water was added, stirred and dissolved to form a precursor solution of the auxiliary agent (solution B). Weigh 2.385g carrier Al 2 o 3 Particles (40-60 mesh) were placed in solution B and impregnated with ultrasonic stirring with a power of 100W and a frequency of 40KHz for 10 minutes. After the upper solution was clarified, continue to stir with a glass rod and ultrasonic for 10 minutes, repeating this twice. The product was dried at 80°C for 12 hours, then raised to 900°C at a rate of 8°C / min, roasted at a constant temperature for 2 hours, and cooled to obtain a carrier. Measure 8.33mL of solution A, put it in a beaker, add the above-mentioned carrier...

Embodiment 2

[0015] Weigh 1.025g Ce(NO 3 ) 3 ·6H 2 O and 0.675g Zr(NO 3 ) 4 ·5H 2 O was placed in a beaker, and 15 mL of deionized water was added, stirred and dissolved to form a precursor solution of the auxiliary agent (solution B). Weigh 2.385g carrier Al 2 o 3 Particles (40-60 mesh) were placed in solution B and impregnated with ultrasonic stirring with a power of 100W and a frequency of 40KHz for 10 minutes. After the upper solution was clarified, continue to stir with a glass rod and ultrasonic for 10 minutes, repeating this twice. The product was dried at a temperature of 80°C for 12 hours, then raised to 900°C at a rate of 8°C / min, roasted at a constant temperature for 2 hours, and cooled to obtain a carrier. Measure 8.33 mL of the solution A prepared in Example 1, put it in a beaker, add the above-mentioned carrier loaded with cerium oxide and zirconia into the solution, stir with a glass rod and immerse with ultrasonic assistance for 10 minutes, after the upper layer solu...

Embodiment 3

[0018] Weigh 0.882g Ce(NO 3 ) 3 ·6H 2 O and 0.872g Zr(NO 3 ) 4 ·5H 2 O was placed in a beaker, and 15 mL of deionized water was added, stirred and dissolved to form a precursor solution of the auxiliary agent (solution B). Weigh 2.385g carrier Al 2 o 3 Particles (40-60 mesh) are placed in solution B, stirred with a glass rod and ultrasonically assisted impregnated for 10 minutes, after the upper solution is clarified, impregnated with ultrasonic agitation with a power of 100W and a frequency of 40KHz for 10 minutes, and repeat this twice. The product was dried at a temperature of 80°C for 12 hours, then raised to 900°C at a rate of 8°C / min, roasted at a constant temperature for 2 hours, and cooled to obtain a carrier. Measure 8.33mL of the solution A configured in Example 1, put it in a beaker, add the above-mentioned carrier loaded with cerium oxide and zirconium oxide into the solution, use 100W power, 40KHz ultrasonic stirring and impregnation for 10 minutes, wait A...

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Abstract

The invention discloses a method for preparing a high-dispersity close-coupled catalyst Pd / Ce-Zr / Al2O3. The method comprises the following process: according to molar ratio, cerium nitrate and zirconium nitrate are mixed and dissolved in deionized water to prepare a precursor solution of an additive; palladium nitrate is dissolved in the deionized water to prepare a precursor solution of an active composition; Al2O3 particles are soaked in the precursor solution of the additive and are dried and roasted; and carrier particles are soaked in the precursor solution of the active composition again and are dried and roasted to prepare the high-dispersity Pd / Ce-Zr / Al2O3 catalyst. The method has the advantages that in the preparation process of the catalyst, an active composition precursor or an additive precursor is evenly dispersed on the surface of Al2O3 in the dipping process by adopting ultrasonic dispersion, thereby improving the activity and thermal stability of the catalyst and better meeting the requirement on emission of an automobile engine in the cold starting period.

Description

technical field [0001] The invention relates to a highly dispersed Pd / Ce-Zr / Al 2 o 3 The invention relates to a preparation method of a close-coupled catalyst, which belongs to the close-coupled catalyst technology. Background technique [0002] In recent years, the research on catalysts for purification of automobile exhaust pollutants HC, CO and nitrogen oxides (NOx) has been very active. With increasingly stringent environmental emissions regulations, it is extremely important to address hydrocarbon emissions during engine cold start. In order to meet emission targets, Pd is used as an active component of close-coupled catalysts due to its excellent low-temperature light-off properties, and heat-resistant inorganic oxides Al 2 o 3 As a carrier for dispersing active components, together with rare earth and transition element oxides (CeO 2 , ZrO 2 ) together form the catalyst. However, the dispersion of active components of catalysts prepared by traditional impregnat...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01D53/94
Inventor 孟明王刚查宇清
Owner TIANJIN UNIV
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