Method for preparing macropore-mesopore Ce1-xZrxO2 solid solution

A solid solution, mesoporous technology, applied in ceramic products, other household appliances, household appliances, etc., to achieve the effect of large mass transfer characteristics and good oxygen storage and release performance

Inactive Publication Date: 2008-09-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

triblock copolymer EO 20 PO 70 EO 20 and EO 106 PO 70 EO 106 , cetyltrimethylammonium bromide, polyethylene glycol-4000 or H(CH 2 CH 2 CH 2 (CH)CH 2 CH 3 ) 89 (OCH 2 CH 2 ) 79 Ordered mesoporous or worm-like mesoporous Ce with a pore size of 4-10 nm can be synthesized using OH as a template 1-x Zr x o 2 Solid solution (C.Ho, et al., J Mater Chem, 2005, 15:2193; Y.Gu, et al., J Rare Earths, 2007, 25:710; Q.Yuan, et al., J Am Chem Soc, 2007, 129:6698; E.L.Crepaldi, et al., Angew ChemInt Ed, 2003, 42:347; T.Brezesinski, et al., New J Chem, 2005, 29:237), but so far, the three-dimensional ordered Ce of macroporous-wormlike mesoporous structure 1-x Zr x o 2 The preparation technology of solid solution has not been reported in the literature and patents at home and abroad

Method used

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  • Method for preparing macropore-mesopore Ce1-xZrxO2 solid solution
  • Method for preparing macropore-mesopore Ce1-xZrxO2 solid solution
  • Method for preparing macropore-mesopore Ce1-xZrxO2 solid solution

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Experimental program
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Embodiment 1

[0020] At normal temperature and pressure, 1g of EO 20 PO 70 EO 20 Dissolve in 15g absolute ethanol, that is, 100% ethanol aqueous solution; add 6mmol CeCl after complete dissolution 3 ·7H 2 O and 4 mmol ZrOCl 2 ·8H 2 O, keep stirring for 1h; place 5g of hard template in the Buchner funnel, add the prepared solution dropwise until it is completely soaked, filter to remove excess liquid, and place it in air at room temperature with a relative humidity below 40% for 48h; at 1°C / min After burning at 300°C and 500°C for 3h and 5h respectively, the three-dimensional ordered macropore-wormlike mesoporous Ce 0.6 Zr 0.4 o 2 solid solution.

[0021] The specific surface area of ​​the solid solution is 64m 2 / g, the pore volume is 0.23m 3 / g; Among them, the specific surface area of ​​macropores with a pore diameter of 36-200nm is 14m 2 / g, the pore volume is 0.13m 3 / g; and the specific surface area of ​​mesopores with a pore diameter of 2-36nm is 50m 2 / g, the pore volume...

Embodiment 2

[0023] At room temperature and pressure, 1 g of EO 20 PO 70 EO 20 Dissolve in 15g of 60% ethanol aqueous solution, add 6mmol CeCl after complete dissolution 3 ·7H 2 O and 4 mmol ZrOCl 2 ·8H 2 O, keep stirring for 1h; place 5g of hard template in the Buchner funnel, add the prepared solution dropwise until it is completely soaked, filter to remove excess liquid, and place it in air at room temperature with a relative humidity below 40% for 48h; at 1°C / min After burning at 300°C and 500°C for 3h and 5h respectively, the three-dimensional ordered macropore-wormlike mesoporous Ce 0.6 Zr 0.4 o 2 solid solution.

Embodiment 3

[0025] At normal temperature and pressure, 1g of EO 20 PO 70 EO 20 Dissolve in 15g of water (i.e. 0% ethanol aqueous solution), add 7mmol CeCl after complete dissolution 3 ·7H 2 O and 3 mmol ZrOCl 2 ·8H 2 O, keep stirring for 1h; place 5g of hard template in the Buchner funnel, add the prepared solution dropwise until it is completely soaked, filter to remove excess liquid, and place it in air at room temperature with a relative humidity below 40% for 48h; at 1°C / min After burning at 300°C and 500°C for 3h and 5h respectively, the three-dimensional ordered macropore-wormlike mesoporous Ce 0.7 Zr 0.3 o 2 solid solution.

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Abstract

The invention relates to a method for producing macroporous-mesoporous Ce1-xZrxO2 solid solution, which belongs to the technology fieldof multiphase catalysis. Currently, the synthetic Ce1-xZrxO2 solid solution has mesoporous structure only. Report on the production of Ce1-xZrxO2 solid solution with three-dimensional ordered macroporous-worm-like mesoporous structure is not available in domestic and abroad. The method comprises the following steps: preparing an ethanol solution of cerium chloride and zirconium oxychloride as metal sources and triblock polymers as soft template under room temperature; impregnating a polymethyl methacrylate monodisperse microsphere template with the solution; suction-filtering under vacuum; drying in room temperature air with a relative humidity below 40%; and burning to obtain the Ce1-xZrxO2 solid solution with three-dimensional ordered macroporous-worm-like mesoporous structure. The inventive Ce1-xZrxO2 solid solution is helpful for diffusion and has large specific surface area, and has good application prospect.

Description

technical field [0001] The invention belongs to the field of heterogeneous catalysis, in particular to a macroporous-mesoporous Ce 1-x Zr x o 2 The preparation method of solid solution, especially involving the preparation of three-dimensional ordered macroporous-worm-like mesoporous Ce by using double templating agent 1-x Zr x o 2 solid solution method. Background technique [0002] Ce 1-x Zr x o 2 The solid solution has excellent thermal stability, oxygen storage and release performance, and low-temperature catalytic performance, and has become an important component of three-way catalysts for motor vehicle exhaust. Studies have shown that the cerium-zirconium solid solution with high specific surface area can help improve its oxygen storage and release capacity, thereby improving the three-way catalytic efficiency. Ce with a three-dimensional ordered macroporous structure and the walls of the macropores are mesoporous 1-x Zr x o 2 Solid solutions have importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B38/00C04B35/622
Inventor 戴洪兴李惠宁何洪訾学红
Owner BEIJING UNIV OF TECH
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