Cerium oxide-zirconium oxide-based mixed oxide and method for producing thereof

A mixed oxide, zirconia-based technology, which is applied in zirconium compounds, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of no OSC and platinum dispersion, and achieve the effect of excellent platinum dispersion

Active Publication Date: 2008-01-02
DAIICHI KIGENSO KAGAKU KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] But the catalyst has a unique structure in which ceria is supported around a solid solution oxi

Method used

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  • Cerium oxide-zirconium oxide-based mixed oxide and method for producing thereof
  • Cerium oxide-zirconium oxide-based mixed oxide and method for producing thereof
  • Cerium oxide-zirconium oxide-based mixed oxide and method for producing thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] 280g of 20% cerium nitrate solution (CeO 2 Equivalent to containing 56 g) heated to 85 ℃, then added 624g 25% sodium sulfate solution (Na 2 SO 4 The equivalent weight is 156 g), and it was maintained at 85° C. for 1 hour to obtain a slurry containing cerium sulfate-sodium mixed salt.

[0103] 110g of 20% zirconium nitrate solution (ZrO 2 Equivalent is containing 22g) and 110g 20% ​​cerium nitrate solution (CeO 2 Equivalent is to contain 22g) to join in this alkaline slurry containing cerium sulfate-sodium mixed salt.

[0104] The solution was then neutralized with 500 g of 25% sodium hydroxide. The pH at this point is 12 or higher.

[0105] Continuing, the hydroxide is obtained by filtering and rinsing with water.

[0106] The obtained hydroxide was then fired at 650° C. in air for 5 hours to obtain the oxide.

[0107] The X-ray diffraction results of the obtained oxide are shown in FIG. 1 .

[0108] In addition, the specific surface area of ​​the oxide, the spe...

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Abstract

The present invention provides a cerium oxide-zirconium oxide-based mixed oxide having superior platinum dispersibility and a suitable OSC, and a simple production process thereof. The cerium oxide-zirconium oxide-based mixed oxide comprises cerium oxide and zirconium oxide, wherein (1) the weight ratio of CeO 2 : ZrO 2 is 60:40 to 90:10, and (2) the cerium oxide and the zirconium oxide are present as a mixture, the zirconium oxide being composed of a solid solution in which tetragonal or cubic zirconium oxide contains cerium.

Description

technical field [0001] The invention relates to a cerium oxide-zirconium oxide-based mixed oxide and a manufacturing method thereof. Background technique [0002] Due to Ce 4+ and Ce 3+ The oxidation-reduction potential of cerium oxide is very small, about 1.6V, and the reaction shown in the following formula is reversible, so cerium oxide has oxygen storage capacity (OSC), and is used as a co-catalyst or catalyst carrier for automotive three-way catalysts. [0003] [0004] But it is known that the OSC of pure cerium oxide is extremely low, about X=0.005. [0005] Therefore, to address this point, there have been numerous reports describing: (1) improving the heat resistance of the specific surface area of ​​ceria, and (2) by adding zirconia to a solid solution with ceria, in the above reaction by Zr with a small ionic radius 4+ Intercalation into the cerium backbone to reduce volume increase and thus improve OSC. [0006] On the other hand, when pure cerium oxide i...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J21/06B01J32/00
CPCB01D2255/908B01J23/63B01J23/42B01D53/945B01J23/002B01J37/038B01J37/0201C01P2004/03Y02T10/22C01P2006/12C01P2002/72B01D2255/407C01G25/00B01J2523/00Y02T10/12B01J2523/3712B01J2523/48
Inventor 冈本博丸木雅俊
Owner DAIICHI KIGENSO KAGAKU KOGYO CO LTD
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