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Ternary Nano catalyst in use for cellular carrier of full metal, preparation method and coating process

A nano-catalyst and honeycomb carrier technology, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the bonding strength between the carrier and the catalytic active layer cannot reach the catalytic to achieve high anti-aging performance, uniform particle size, and good low-temperature activity

Inactive Publication Date: 2007-02-21
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the key technical problems is that due to the large difference in thermal expansion coefficient between the metal carrier and the inorganic catalytic material, the bonding strength between the carrier and the catalytic active layer cannot meet the requirements for the preparation of the catalytic converter. Therefore, researchers at home and abroad are actively researching solutions to improve the bonding performance of coatings and metal supports

Method used

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  • Ternary Nano catalyst in use for cellular carrier of full metal, preparation method and coating process
  • Ternary Nano catalyst in use for cellular carrier of full metal, preparation method and coating process
  • Ternary Nano catalyst in use for cellular carrier of full metal, preparation method and coating process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The zirconium source is zirconium sulfate tetrahydrate; the cerium source is cerium nitrate hexahydrate; the lanthanum source is lanthanum nitrate; the surfactant is polyoxyethylene polyoxypropylene copolymer. According to the formula ratio (weight ratio): 1Zr(SO 4 ) 2 : 4Ce(NO 3 ) 3 : 1La(NO 3 ) 3 : 3 Surfactant: 150H 2 O; carry out hydrothermal crystallization treatment at 120°C for 24 hours; synthesize a composite precursor sample of nano-lanthanum oxide, cerium oxide and zirconia with high specific surface area and high dispersion, and disperse in an organic solvent after centrifugation and drying. At the same time, a solution containing platinum, palladium and rhodium ions (1-3 wt%) is added, stirred for 3 hours, and dried by centrifugation. After drying at 100°C for 2 hours, calcining in a muffle furnace to remove the organic surfactant, to obtain the prepared lanthanum oxide, cerium / zirconia composite nano-three-way catalytic material, calcining temperature...

Embodiment 2

[0044]The proportion of the formula remains unchanged, and the samples without heat treatment after hydrothermal treatment, the transmission electron microscope photos and the electron diffraction patterns of the corresponding areas are as follows: image 3 a, XRD diffraction pattern as Figure 4 as shown in a. It can be seen that the sample without heat treatment also presents uniformly distributed cubic phase nanocrystals, and the composite oxide has the highest specific surface area and pore capacity.

Embodiment 3

[0046] No surfactant was added to the formula, and the other proportions and process remained unchanged. The specific surface area and pore volume structure parameters of the samples heat-treated at 500 °C are shown in Table 2. It can be seen that the specific surface area and pore volume of the sample without added surfactant are significantly reduced compared with Embodiment 1 after being calcined at 500 degrees. Stability is very beneficial.

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Abstract

A three-element nano-catalyst for the metallic cellular carrier used to treat the tail gas of car is proportionally prepared from lanthanum oxide, zirconium oxide and cerium oxide through dissolving them in deionized water, adding surfactant, hydrothermal treating, washing, filtering, dispersing it in organic solvent, adding the solution of noble metal, stirring, baking and calcining. Its coating technology includes such steps as ultrasonic cleaning of metallic cellular carrier multiple times, dispersing said nano-catalyst in organic solvent, stirring, baking, coating and calcining.

Description

technical field [0001] The invention relates to a ternary nanocatalyst for an all-metal honeycomb carrier and its preparation method and coating process, more precisely to a nano-lanthanum oxide / cerium oxide / zirconia (La 2 o 3 / CeO 2 / ZrO 2 ) composite three-way catalyst material, a preparation method thereof and a coating process carried on the surface of an all-metal honeycomb carrier, belonging to the field of catalyst materials. Background technique [0002] The current social progress is accelerating and the pollution caused by automobiles is becoming more and more serious. Therefore, environmental protection, especially the effective treatment of automobile exhaust, has become a common concern of everyone. [0003] Automobile exhaust catalysts are classified into oxidation type, reduction type and three-effect (element) type according to the reaction function. Oxidation catalysts are used to purify CO and HC in exhaust gas, and reduction catalysts are used to purif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06B01J35/04B01D53/94
Inventor 陈航榕施剑林严东生
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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