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A rapid synthesis of mesoporous nanostate ln 2 o 2 so 4 Preparation method of oxygen storage material

A 2O2SO4, oxygen storage technology, applied in catalyst activation/preparation, separation methods, chemical instruments and methods, etc., can solve the problems of long preparation cycle, complex process, many control points, etc., to achieve short preparation cycle, simple preparation process, The effect of suppressing agglomeration

Active Publication Date: 2022-08-09
昆明贵研催化剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the whole process, there are many control points, the process is complicated, the preparation cycle is long, and the energy consumption is large

Method used

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  • A rapid synthesis of mesoporous nanostate ln <sub>2</sub> o <sub>2</sub> so <sub>4</sub> Preparation method of oxygen storage material
  • A rapid synthesis of mesoporous nanostate ln <sub>2</sub> o <sub>2</sub> so <sub>4</sub> Preparation method of oxygen storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 10.67g La (NO 3 ) 3 ·6H 2 O is placed in an agate mortar and smashed and finely ground, add 7.33 g of ammonium lauryl sulfate aqueous solution (water content 30%), grind until the solution becomes a gel, transfer to a crucible at 700 ° C for constant temperature roasting for 60 min to obtain fluffy La 2 O 2 SO 4 . Its X-ray diffraction analysis spectrum is as follows figure 1 (Example 1). After XRD, low temperature N 2 Adsorption, TPR, TPO test, the grain size is 10.3nm, the specific surface area is 14.3m 2 / g, the pore size distribution is 7~35nm, the reduction temperature is 843℃, and the oxidation temperature is 372℃.

Embodiment 2

[0021] Weigh 8.54g La (NO 3 ) 3 ·6H 2 O and 2.12g Ce (NO 3 ) 3 ·6H 2 O was placed in an agate mortar and smashed and ground, added 7.33 g of aqueous solution of ammonium dodecyl sulfate (water content 30%), ground until the solution became a gel, transferred to a crucible at 700 ° C for constant temperature roasting for 30 min to obtain a fluffy ( La 0.8 Ce 0.2 ) 2 O 2 SO 4 . Its X-ray diffraction analysis spectrum is as follows figure 1 (Example 2). After XRD, low temperature N 2 Adsorption, TPR, TPO test, the grain size is 10.1nm, the specific surface area is 15.2m 2 / g, the pore size distribution is 7~35nm, the reduction temperature is 801℃, and the oxidation temperature is 370℃.

Embodiment 3

[0023] Weigh 8.54g La (NO 3 ) 3 ·6H 2 O and 2.12g Pr(NO 3 ) 3 ·6H2 O was placed in an agate mortar and smashed and ground, added 7.33g of aqueous ammonium dodecyl sulfate solution (30% water), ground until the solution became a gel, transferred to a crucible at 550 ° C for constant temperature roasting for 20 min to obtain a fluffy ( La 0.8 Pr 0.2 ) 2 O 2 SO 4 . Its X-ray diffraction analysis spectrum is as follows figure 1 (Example 3). After XRD, low temperature N 2 Adsorption, TPR, TPO test, the grain size is 8.1nm, and the specific surface area is 30.5m 2 / g, the pore size distribution is 5~30nm, the reduction temperature is 753℃, and the oxidation temperature is 377℃.

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Abstract

The invention provides a rapid synthesis of mesoporous nano-state Ln 2 O 2 SO 4 Preparation method of oxygen storage material, the method combines Ln(NO 3 ) 3 ·nH 2 O is placed in a mortar and smashed and finely ground; add surfactant solution and grind to form a gel; transfer to a crucible or beaker for roasting in a muffle furnace to obtain mesoporous nano-state Ln 2 O 2 SO 4 Oxygen storage material. The invention has short preparation time, low synthesis temperature, simple process, energy saving and no pollution to the environment. The prepared mesoporous nanostate Ln 2 O 2 SO 4 Oxygen storage materials have large specific surface area and low redox temperature, and have great application potential in automobile exhaust gas purification catalysts.

Description

technical field [0001] The invention belongs to the technical field of catalytic material preparation, and in particular relates to a rapid synthesis of mesoporous nano-state Ln 2 O 2 SO 4 Methods of making oxygen storage materials. Background technique [0002] Three-way catalysts typically operate in a dynamic lean-rich switching atmosphere that frequently fluctuates around the stoichiometric air-fuel ratio. As the key component of the three-way catalyst, the oxygen storage material uses its own characteristics of storing oxygen under lean burn conditions and releasing oxygen under rich burn conditions to adjust the catalyst working window, adaptability, and help achieve CO, HC, NO x efficient conversion. Due to the comprehensive consideration of oxygen storage capacity, oxygen storage and release rate, thermal stability, and chemical stability, cerium-zirconium composite oxides are currently the main oxygen storage materials. However, with the continuous increase in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053B01J35/02B01J35/10B01J37/00B01D53/94B01D53/72B01D53/56B01D53/62B01J35/00
CPCB01J27/053B01J37/0009B01D53/945B01J35/40B01J35/613B01J35/647Y02T10/12
Inventor 杜君臣罗永明张黎明杨冬霞常仕英冯丰贺小昆赵云昆夏文正
Owner 昆明贵研催化剂有限责任公司
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