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A kind of PD containing catalyst and preparation method thereof

A technology of catalyst and catalyst slurry, which is used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of small contact surface and poor catalyst performance.

Active Publication Date: 2020-10-23
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of small contact surface between Pd and catalytic material and poor catalyst performance in existing Pd-containing catalysts, and provide a Pd-containing catalyst and a preparation method thereof. The method is added to the catalytic material, which improves the dispersion of Pd in ​​the catalytic material and increases the contact surface between Pd and the catalytic material; also by adjusting the pH value of the Pd salt solution in the secondary infiltration, the adsorption of the catalytic material to Pd is improved. Well, the dispersibility of Pd in ​​the catalytic material is further improved, so that the contact surface with the catalytic material is significantly increased, and the overall catalytic effect of the catalyst is significantly improved; the Pd-containing catalyst prepared by the inventive method can effectively reduce the Pd in ​​the automobile exhaust. Pollutants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparation of Pd-containing catalyst powder: Weigh palladium nitrate (containing Pd: 30g), add 300g of deionized water, stir well; mix 270g of La-Al 2 o 3 Add the powder and 140g of oxygen storage material (cerium-zirconium-lanthanum-praseodymium composite oxide) into the well-stirred palladium nitrate solution, stir quickly, let stand for 1 hour, and then pre-dry at 100°C for 5 hours to obtain the pre-dried powder; weigh Take palladium nitrate (containing Pd: 10g), add 250g deionized water and stir evenly, adjust the pH of the solution to 1.0 with ammonia water, add the pre-dried powder into the palladium nitrate solution with adjusted pH, stir quickly and place it for 1 hour, then 100 Drying at ℃ for 5 hours, and finally calcining at 550℃ for 2 hours to obtain Pd-containing catalyst powder;

[0041] Preparation of Rh-containing catalyst powder: Weigh Rh nitrate (containing Rh: 2g), add 260g deionized water, stir well; mix 150g La-Al 2 o 3 Add powder and 298g o...

Embodiment 2

[0045] (1) Preparation of Pd-containing catalyst powder: Weigh dinitrosodiammine palladium (containing Pd: 24g), add 300g of deionized water, stir well; mix 270g of La-Al 2 o 3 Powder, 140g of oxygen storage material (cerium, zirconium, lanthanum and praseodymium composite oxide) was added to the evenly stirred dinitrosodiammine palladium solution, stirred rapidly and placed for 1 hour, and then dried at 120°C for 4 hours to obtain a pre-dried powder; Weigh dinitrosodiammine palladium (containing Pd: 16g), add 250g deionized water and stir evenly, adjust the pH of the solution to 2.0 with acetic acid, add the obtained pre-dried powder to the adjusted pH dinitrosodiamine In the palladium solution, stir rapidly and place it for 0.5 hours, then dry at 100°C for 5 hours, and calcined at 550°C for 2 hours to obtain a Pd-containing precious metal powder;

[0046] Preparation of Rh-containing catalyst powder: Weigh Rh nitrate (containing Rh: 2g), add 260g deionized water, stir well;...

Embodiment 3

[0050] (1) Preparation of Pd-containing catalyst powder: Weigh palladium sulfate (containing Pd: 36g), add 300g deionized water, stir well; mix 270g La-Al 2 o 3 Add the powder and 140g of oxygen storage material (cerium-zirconium-lanthanum-praseodymium composite oxide) into the evenly stirred palladium nitrate solution, stir quickly and evenly, let stand for 0.5 hour, and then dry at 80°C for 6 hours to obtain a pre-dried powder. Weigh palladium sulfate (containing Pd: 4g), add 250g deionized water and stir evenly, adjust the pH of the solution to 0.1 with ammonia water, add the obtained pre-dried powder into the palladium sulfate solution with adjusted pH, stir quickly and evenly, and then let stand 1.5 hours, then dried at 120°C for 4 hours, and then calcined at 600°C for 1 hour to obtain Pd-containing noble metal powder;

[0051] Preparation of Rh-containing catalyst powder: Weigh Rh nitrate (containing Rh: 2g), add 260g deionized water, stir well; mix 150g La-Al 2 o 3 A...

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Abstract

The invention discloses a Pd-containing catalyst and a preparation method thereof; not only adding Pd to a catalytic material through a step-by-step infiltration method, improving the dispersion of Pd in ​​the catalytic material and increasing the contact surface between Pd and the catalytic material; By adjusting the pH value of the Pd salt solution in the secondary infiltration, the adsorption of Pd on the catalytic material is better, and the dispersion of Pd in ​​the catalytic material is further improved, so that the contact surface with the catalytic material is significantly increased, and the overall performance of the catalyst is improved. The catalytic effect is significantly improved; the Pd-containing catalyst prepared by the method of the invention can effectively reduce the pollutants in the automobile tail gas.

Description

technical field [0001] The invention relates to the field of automobile tail gas purification catalysts, in particular to a Pd-containing catalyst and a preparation method thereof. Background technique [0002] With the increasingly urgent energy and environmental issues, in order to protect the environment and save energy, people put forward higher requirements for the emission control of motor vehicle exhaust. As we all know, the main pollutants of automobile exhaust are carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO x ) and particulate matter, while the three-way catalyst installed in the automobile exhaust system can effectively convert carbon monoxide, hydrocarbons, and nitrogen oxides in automobile exhaust into carbon dioxide (CO 2 ), water (H 2 O) and nitrogen (N 2 ), thereby reducing the air pollution caused by automobile exhaust. However, in the process of catalytic conversion of automobile exhaust, since the catalytic conversion of the three-way c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J37/02B01J35/04B01J37/08F01N3/28
CPCF01N3/28B01J23/83B01J37/0018B01J37/0215B01J35/56Y02A50/20
Inventor 李大成王金凤陈山虎兰丽杨兰刘屿剑王云李云陈启章陈耀强
Owner SINOCAT ENVIRONMENTAL TECH
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