Cerium zirconium aluminum composite oxides sosoloid with a mesopore structure and method for preparing the same

Inactive Publication Date: 2008-01-30
山东齐鲁华信实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN1449863A discloses a nano-cerium-zirconium-based composite oxide, which is prepared by coprecipitation of hydrogen peroxide and ammonia water, but its specific surface is low and non-porous
Chinese patent CN1695798A discloses a cerium-zirconium-aluminum oxide solid solution, but a stabilizer needs to be added in its preparation, and at least one of lanthanum oxide, yttrium oxide and alkaline earth metal oxide is selected as a stabilizer, and its preparation method is complicated
Most of these cerium-zirconium-based oxide solid solutions reported above have low specific surface area, non-porosity, complex preparation process, and low catalytic activity when used as a catalyst carrier.

Method used

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  • Cerium zirconium aluminum composite oxides sosoloid with a mesopore structure and method for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] At room temperature, weigh 6 mmol of CTMACl, dissolve it in 200 mL of deionized water, and stir vigorously for 15 minutes, then add the calculated amount of Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·5H 2 O and Al(NO 3 ) 3 ·6H 2 O (molar ratio 3.5:1.0:0.5), continue to stir for 30 minutes, add 0.2M NaOH solution to a pH value of 10, stir the resulting suspension for 12 hours, age at 90°C for 3 hours, wash with hot water, and suction filter, Mesoporous Ce prepared by drying at 110°C for 6 hours and calcined at 450°C for 4 hours 0.7 Zr 0.2 Al 0.1 o 2 The solid solution, its XRD, nitrogen adsorption and desorption analysis, and TEM analysis are shown in Figure 1-3.

Embodiment 2

[0016] The mixed solution in Example 1 was adjusted to pH 9 with NaOH, and the others were the same as in Example 1. The prepared mesoporous Ce 0.7 Zr 0.2 Al 0.1 o 2 The XRD and nitrogen adsorption-desorption analysis of solid solution samples are shown in Figure 1-2.

Embodiment 3

[0018] Change the mol ratio of Ce / Zr / Al in the reaction solution in Example 1 to 3: 1: 1, and others are the same as Example 1, and prepare mesoporous Ce 0.6 Zr 0.2 Al 0.2 o 2 solid solution samples. Its XRD, nitrogen adsorption, and transmission electron microscope images are similar to those shown in Figures 1-3.

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Abstract

The invention relates to a preparation method for the cerium-zirconium-aluminum composite oxide solid solution material with mesopore structure. The mesopore Ce1-x-yZrxAlyO2 (x is equal to 0.10-0.45; y is equal to 0.10-0.45) solid solution with high specific surface (200m2/g through 250m2/g) is prepared for one step by adopting the simple surface active agent (CTMACI) method, the hole diameter ranges from 2.5 nm to 3.4 nm, the worm-shaped channel structure with narrow distribution of hole diameter, and the invention can be used for high activity catalyst or catalyst carrier. In the preparation process, the operation is simple, the raw material is easy to be obtained and the invention is suitable for the industrial enlarged production.

Description

technical field [0001] The invention relates to a catalytic material, in particular to the preparation of a cerium-zirconium-aluminum composite oxide solid solution material with a mesoporous structure, and belongs to the field of inorganic material synthesis. Background technique [0002] Due to its variable valence state, cerium oxide has the function of storing and releasing oxygen. It is a very important functional material and is widely used in catalysts, solid fuel cells, ultraviolet light absorption, glass polishing materials, etc. doped ZrO 2 After that, CeO can be effectively increased 2 Oxygen storage capacity, redox performance and thermal stability. CeO with mesoporous structure 2 -ZrO 2 compounds, due to their high specific surface area and channel shape selectivity, enhanced catalytic performance can be obtained. Document New J.Chem.2005, 29, 237 reported the preparation of mesoporous Ce by using KLE polymer as a template 0.5 Zr 0.5 o 2 . Document J.Am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06B01J21/04H01M8/10
CPCY02E60/521Y02P70/50
Inventor 袁忠勇王震宇明曰信
Owner 山东齐鲁华信实业股份有限公司
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