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A ternary catalyst and its preparing method

A technology of three-way catalyst and catalytic layer, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc. It can solve the problems of affecting the performance of the catalyst, the range of air-fuel ratio is not wide enough, and the thermal stability is poor.

Inactive Publication Date: 2008-04-16
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalyst coating method improves the utilization rate of precious metals to a certain extent, and obtains a wider range of air-fuel ratio, that is, the efficiency of oxidation and reduction in a wider range is relatively high, but as the reaction progresses Alumina coatings loaded with precious metals are particularly prone to sintering in high-temperature environments, resulting in loss of specific surface and affecting the performance of the entire catalyst. Therefore, it is necessary for the catalyst to have a certain degree of stability to high temperatures, that is, thermal stability.
[0012] Therefore, the current three-way catalyst still has the problems of poor thermal stability and insufficient range of air-fuel ratio.

Method used

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  • A ternary catalyst and its preparing method
  • A ternary catalyst and its preparing method
  • A ternary catalyst and its preparing method

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preparation example Construction

[0039] The preparation method of catalyst of the present invention is carried out according to the following steps:

[0040] (1) Prepare the first layer of mixed active alumina feed liquid loaded with one or more rare earth metals and alkaline earth metals: take an appropriate amount of rare earth or alkaline earth metal nitrate, add an appropriate amount of deionized water, and prepare a concentration of 30-60% solution. Weigh an appropriate amount of pseudo-boehmite, mix it with this solution and stir evenly, dry in a drying oven at 70-120°C for 3-10 hours to obtain a cake-like solid, and grind it into a powder. Roasting at 400-600°C for 2-5 hours in a muffle furnace to produce mixed activated alumina powder loaded with one or more of rare earth metals and alkaline earth metals. Weigh an appropriate amount of the powder, zeolite powder, and oxygen storage material, mix with a certain amount of deionized water to make the solid content 30-60%, and ball mill to obtain the fir...

Embodiment 1

[0048] Weigh La(NO 3 ) 3 ·6H 2 030 grams, the preparation concentration is 100ml of solution of 23%; Take by weighing 100 grams of pseudo-boehmite (Aluminum Corporation of China, trade mark: P-DP-03-LS), and La(NO 3 ) 3 Mix and stir the solution evenly, put it in a blast drying oven and dry it at 110°C for 3 hours, take out the cake-like solid and grind it into powder, and roast it in a muffle furnace at 450°C for 4 hours to prepare alumina loaded with La; weigh the alumina loaded with La 70 grams of aluminum, 30 grams of zeolite powder, 30 grams of Ce-Zr mixed oxide (Shandong Zibo Huaqing Powder Technology Co., Ltd., model: CZ280, CZ370 or CZ460), add 300ml deionized water and mix to make the solid content 30%, The first layer of alumina coating liquid loaded with La, Ce and Zr was obtained by ball milling.

[0049] Weigh out 0.2% RhCl 3 Solution 100ml, weigh 100g of pseudo-boehmite, mix and stir evenly, dry at 110°C for 4 hours to obtain a cake-like solid, grind it into...

Embodiment 2

[0055] Weigh Zr(NO 3 ) 4 ·3H 2 O40g, Ba(NO 3 ) 2 15 g, prepare 100 ml of a mixed solution with a concentration of 30%; weigh 100 g of pseudo-boehmite and mix with this solution evenly, dry at 110°C for 3h, take out the cake-like solid and grind it into powder. Roast at 600°C for 4h to obtain a Alumina loaded with Zr and Ba; Weigh 70 grams of alumina loaded with Zr and Ba, 40 grams of zeolite powder, and 30 grams of Ce-Zr composite oxide, add 250ml deionized water and mix to make the solid content 36%, and ball mill The first layer of aluminum oxide coating material solution loaded with Zr, Ba and Ce was obtained.

[0056] Weigh out 0.15% H 3 RhCl 6 Solution 100ml, weigh 100g of pseudo-boehmite, mix and stir evenly, dry at 110°C for 4h to obtain a cake-like solid, grind it into powder, and roast at 650°C for 4h to obtain Rh-modified alumina powder. Get 70 grams of this powder, add deionized water to make the solid content 50%, and ball mill to obtain the second layer of ...

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Abstract

The present invention relates to a three-way catalyst which is used for purifying the vehicle tail gas and can simultaneously do catalyzing and cleaning functions to CO, HC and NOx and the preparing method thereof. The first catalyzing layer is one or a mixture of a plurality of metals selected from the active aluminum oxide carrying rare earth metal and alkaline earth metal, the second catalyzing layer is alumina oxide carrying a first active noble metal which has toxin immunity and nonzero residual activity, the third catalyzing layer is a second noble metal which has catalytic activity, the fourth catalyzing layer is rare earth, alkali soil or the oxide of the transitional metal. The catalyst is composed of cordierite honeycomb ceramic substrate, the oxide aluminum layer and the active noble metal. The catalyst prepared by the method has a better catalyzing property and thermal stability, and adapts the broader air / fuel ratio scope.

Description

【Technical field】 [0001] The invention relates to the treatment of automobile exhaust pollutants (CO, HC, NO X ) a rare earth composite oxide-noble metal honeycomb catalyst with a three-way catalytic purification function and a preparation method thereof. 【Background technique】 [0002] The purpose of catalytic purification of automobile exhaust gas is to oxidize harmful CO and HC into CO 2 and H 2 O, will NO X reduced to N 2 . Because the chemical composition of automobile exhaust is very complex, its conversion rate is not only related to the activity of the catalyst, but also related to whether the reaction gas is an oxidizing gas or a reducing gas. Therefore, the catalyst is functionally divided into two parts: oxidation type and reduction type. [0003] The oxidation catalyst mainly catalyzes the oxidation reaction of CO and HC, and the main reactions are as follows: [0004] 2CO+O 2 ——2CO 2 [0005] 4HC+5O 2 ——4CO 2 +2H 2 o [0006] HC+NO 2 ——CO 2 +H 2 ...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/58B01J32/00B01J37/025B01D53/94
CPCY02C20/10Y02T10/22Y02A50/20Y02T10/12
Inventor 欧玲刘武略丁大勇王胜杰
Owner BYD CO LTD
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