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A kind of preparation method of ceria-zirconia solid solution catalyst

A solid solution and catalyst technology, which is applied in the field of preparation of ceria-zirconia solid solution catalysts, can solve problems such as reduction, specific surface area reduction, and limited application range

Active Publication Date: 2021-03-19
台州聚合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CeO 2 At a high temperature of 1000°C, sintering is easy to occur, the specific surface area is reduced, and the oxygen storage capacity (Oxygen Storage Capacity, OSC) is reduced, which limits its practical application range to some extent.

Method used

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  • A kind of preparation method of ceria-zirconia solid solution catalyst
  • A kind of preparation method of ceria-zirconia solid solution catalyst
  • A kind of preparation method of ceria-zirconia solid solution catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 3.02gCeCl 3 ·7H 2 O (8.1mmol) and 0.2898g ZrOCl 2 ·8H 2 O (0.9mmol) in a beaker, add 10ml of deionized water, stir with a glass rod until completely dissolved. Then the solution was transferred to a three-necked flask, and 0.30 M K was added dropwise with a constant pressure dropping funnel under vigorous stirring. 2 CO 3 aqueous solution (0.4 ml / min) until a pH of 8.2 was reached. After the dropwise addition, the obtained suspension was aged at room temperature for 12 hours, and then transferred to the crystallization kettle and placed in a constant temperature drying oven at 60°C for 3 hours. After the crystallization kettle was naturally cooled, centrifuged and used Washing with deionized water until the chloride completely disappeared (AgNO 3 test). The samples were dried in a constant temperature drying oven at 80 °C for 12 h. After completely drying, transfer it to a crucible, put it into a muffle furnace at 350°C, and bake it for 5h (heating rate 3°...

Embodiment 2

[0018] With embodiment 1, difference is that dropwise K 2 CO 3 aqueous solution until a pH of 9.2 is reached.

Embodiment 3

[0020] With embodiment 1, difference is that dropwise K 2 CO 3 aqueous solution until a pH of 10.2 is reached.

[0021] The CeO that above-mentioned embodiment makes 2 -ZrO 2 The pore structure parameters of the solid solution are shown in Table 1. It can be seen that as the pH decreases, the specific surface area of ​​the solid solution increases continuously, and the specific surface area of ​​the sample at pH 8.2 increases by 106.6% compared with the sample at pH 10.2.

[0022] Table 1CeO 2 -ZrO 2 Pore ​​Structure Parameters of Solid Solutions

[0023]

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Abstract

The invention discloses a preparation method of a cerium oxide-zirconia solid solution catalyst. The method first weighs CeCl 3 ·7H 2 O and ZrOCl 2 ·8H 2 O was added to deionized water and stirred until completely dissolved, then K was added dropwise under vigorous stirring. 2 CO 3 aqueous solution until the pH value of the solution is 8.2-10.2; after the dropwise addition, the suspension obtained is aged at room temperature for 12 hours. The aged suspension is then transferred to the crystallization kettle and placed in a constant temperature drying box for hydrothermal reaction. Wait until the crystallization kettle After natural cooling, centrifuge and wash with deionized water until the chloride completely disappears. After drying, transfer to the crucible and roast in a muffle furnace to obtain CeO. 2 ‑ZrO 2 Solid solution catalyst. The method of the present invention uses potassium carbonate solution as a precipitant and combines dripping with a hydrothermal method (comprehensive method) to achieve it. The prepared catalyst has high crystallinity, moderate particle length, good flower-like bonding, and large specific surface area.

Description

technical field [0001] The present invention relates to a kind of ceria-zirconia (CeO 2 -ZrO 2 ) Preparation method of solid solution catalyst. Background technique [0002] At present, the environmental problem has become a major global problem. The large-scale smog weather, PM2.5 and ultra-fine floating dust particles that frequently appear in the eyes of the public are harmful to public health. One source is harmful substances in motor vehicle exhaust. Automobile exhaust purification catalysts mainly include precious metal catalysts and non-precious metal catalysts. Due to the scarcity and high price of noble metal resources, the development of non-noble metal catalysts with excellent catalytic activity has become the focus of research. Rare earth cerium oxide (CeO x ) as an oxygen storage material is widely used in three-way catalysts (Three Way Catalyst, TWC) for automobile exhaust purification. reactivity. Ceria (CeO 2 ) has a fluorite structure and shows good ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01D53/94
CPCB01D53/945B01J23/10B01J35/00B01J35/30B01J35/613
Inventor 郑叶芳黄国波
Owner 台州聚合科技有限公司