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Praseodymium-doped cerium-zirconium carrier catalyst and preparation method thereof

A catalyst, a cerium-zirconium technology, which is applied in the field of praseodymium-doped cerium-zirconium supported catalyst and its preparation, can solve the problems of decreased oxygen storage and release capacity, high production cost, small specific surface area, etc., achieve high oxygen buffer capacity and improve catalytic activity , the effect of high oxygen storage performance

Active Publication Date: 2016-06-22
淄博加华新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cerium ions generate Ce in an oxidizing or reducing atmosphere 3+ and Ce 4+ Oxidation-reduction reaction between them, so as to realize the function of oxygen storage and oxygen release, which is helpful to realize the catalytic conversion of automobile exhaust, etc., but pure cerium oxide is very easy to sinter at high temperature, resulting in a decline in the ability to store and release oxygen. Doping an appropriate amount of zirconium to form a cerium-zirconium-based oxide solid solution can greatly improve the high-temperature aging resistance and oxygen storage and release properties of cerium oxide. Therefore, research on the synthesis of cerium-zirconium-based oxide solid solutions has attracted widespread attention.
However, the existing cerium oxide supported catalysts have defects such as high production cost, serious powder agglomeration, and small specific surface area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare a praseodymium-doped cerium-zirconium carrier catalyst, the chemical composition and weight content are:

[0032] 40 parts of cerium oxide, 42 parts of zirconia, 3 parts of praseodymium oxide, 0.6 part of vanadium oxide, 0.3 part of chromium oxide, 0.3 part of manganese oxide, 0.25 part of iron oxide, 0.45 part of cobalt oxide, and 0.8 part of copper oxide.

[0033] The preparation method comprises the following steps:

[0034] (1) Mix the aqueous solutions of cerium chloride, zirconium nitrate, praseodymium oxide, vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide, and copper oxide to obtain a mixed solution, and the concentration of the mixed solution is controlled at 0.45mol / L, Adjust the pH value of the feed liquid to be controlled at 2 by adding ammonia water, and stir well;

[0035] (2) add the surfactant (sodium sulfonate) that is 0.5% of the mixed solution in parts by weight, stir and place it in a constant temperature tank to sta...

Embodiment 2

[0041] Prepare a praseodymium-doped cerium-zirconium carrier catalyst, the chemical composition and weight content are:

[0042] 30 parts of cerium oxide, 50 parts of zirconia, 5 parts of praseodymium oxide, 1 part of vanadium oxide, 0.5 part of chromium oxide, 0.5 part of manganese oxide, 0.2 part of iron oxide, 0.4 part of cobalt oxide, and 0.5 part of copper oxide.

[0043] The preparation method comprises the following steps:

[0044] (1) Mix the aqueous solutions of cerium chloride, zirconium nitrate, praseodymium oxide, vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide, and copper oxide to obtain a mixed solution, and the concentration of the mixed solution is controlled at 0.4mol / L, Adjust the pH value of the feed liquid to be controlled at 3 by adding ammonium bicarbonate, and stir well;

[0045] (2) Adding the surfactant (oleic acid) that is 0.1% of the mixed solution in parts by weight, stirring evenly, placing it in a constant temperature ta...

Embodiment 3

[0051] Prepare a praseodymium-doped cerium-zirconium carrier catalyst, the chemical composition and weight content are:

[0052] 50 parts of cerium oxide, 30 parts of zirconia, 1 part of praseodymium oxide, 0.2 part of vanadium oxide, 0.2 part of chromium oxide, 0.1 part of manganese oxide, 0.3 part of iron oxide, 0.5 part of cobalt oxide, and 1 part of copper oxide.

[0053] The preparation method comprises the following steps:

[0054] (1) Mix the aqueous solutions of cerium chloride, zirconium nitrate, praseodymium oxide, vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide, and copper oxide to obtain a mixed solution, and the concentration of the mixed solution is controlled at 0.5mol / L, Adjust the pH value of the feed liquid to be controlled at 1 by adding sodium hydroxide, and stir well;

[0055] (2) adding the surfactant (polyethylene glycol) that is 1% of the mixed solution in parts by weight, stirring evenly, placing it in a constant temperature ta...

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Abstract

The invention relates to a solid solution carrier catalyst, in particular to a praseodymium-doped cerium-zirconium carrier catalyst. The chemical composition and weight content are: 30-50 parts of ceria, 30-50 parts of zirconia, 1-5 parts of praseodymium Transition metal oxide: 1-5 parts; wherein, the transition metal oxide is a mixture of vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide and copper oxide. The invention also provides a preparation method thereof. All raw materials are mixed, a surfactant is added, and the pH is adjusted to 8-10 to obtain a colloidal precipitate, and the product is obtained after roasting. The invention overcomes the doping defects caused by doping in the cerium-zirconium carrier, and at the same time greatly improves the thermal stability, aging specific surface area, oxygen storage capacity and other performance indicators of the carrier catalyst; the invention also provides its preparation method, raw material price Inexpensive, simple process, and conducive to large-scale industrial production.

Description

technical field [0001] The invention relates to a solid solution carrier catalyst, in particular to a praseodymium-doped cerium-zirconium carrier catalyst and a preparation method thereof. Background technique [0002] As an important catalyst carrier, cerium oxide has unique oxygen storage capacity and other excellent properties. Cerium ions generate Ce in an oxidizing or reducing atmosphere 3+ and Ce 4+ Oxidation-reduction reaction between them, so as to realize the function of oxygen storage and oxygen release, which is helpful to realize the catalytic conversion of automobile exhaust, etc., but pure cerium oxide is very easy to sinter at high temperature, resulting in a decline in the ability to store and release oxygen. Doping an appropriate amount of zirconium to form a cerium-zirconium-based oxide solid solution can greatly improve the high-temperature aging resistance and oxygen storage and release properties of cerium oxide. Therefore, research on the synthesis of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889
Inventor 黄贻展尹鹏王忠徐清辉
Owner 淄博加华新材料有限公司
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