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Hydrogen-storing material with low-cerium and production thereof

A technology of oxygen storage materials and cerium oxide, which is applied in the field of oxygen storage materials, carriers and additives, to achieve the effects of increased pore volume, excellent thermal stability, and high phase stability

Active Publication Date: 2006-08-16
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing oxygen storage material technology cannot well meet the above requirements.

Method used

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  • Hydrogen-storing material with low-cerium and production thereof
  • Hydrogen-storing material with low-cerium and production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Prepare an oxygen storage material with yttrium oxide as an auxiliary agent, and calculate the oxide precursors cerium nitrate, zirconium nitrate and yttrium nitrate Y according to the content of metal elements in ceria, zirconium oxide and yttrium oxide as the constituent components of the given material the weight of. A certain amount of cerium nitrate, zirconium nitrate and yttrium nitrate are weighed in proportion to prepare a mixed solution of nitrate. Then, under stirring condition, it is dripped into the reaction vessel co-currently with ammonia water, and the added amount of the precipitant keeps the pH value of the reaction medium at about 13. After the reactants are fully precipitated, stop stirring and age for about 10 hours, then carry out solid-liquid separation by suction filtration. deal with. The surfactant is a polyvinyl alcohol solution with a concentration of 20%. The solid phase treated with the surfactant is dried at 150° C. for 24 hours, and the...

Embodiment 2

[0041] To prepare the oxygen storage material with yttrium oxide as the auxiliary agent, the specific preparation method is basically the same as the method in Example 1 of this part. In the reaction vessel, the pH value of the precipitation reaction solution was kept at 8; the second was the calcination temperature of 600°C. The measurement results of oxygen storage, specific surface area and pore volume are listed in Table 2 below.

[0042]

Embodiment 3

[0044] To prepare the oxygen storage material with yttrium oxide as the auxiliary agent, the specific preparation method is basically the same as the method in Example 1 of this part. The difference lies in that, first, the precipitant is a mixed solution prepared from ammonia water and ammonium carbonate solution, which is mixed with nitric acid. The mixed salt solution was added to the reaction vessel in parallel, and the pH value of the precipitation reaction solution was kept at 9; the second was to obtain low-cerium oxygen storage materials by calcination at 800°C for 8 hours, and then some samples were aged at 1000°C for 10 hours. The measurement results of oxygen storage, specific surface area and pore volume are listed in Table 3 below.

[0045]

sample

composition

oxygen storage

(μmol / g)

BET specific surface

(m 2 / g)

Kong Rong

B-Zr75800

Ce 0.15 Zr 0.75 Y 0.1 O x

222.9

107.3 ...

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Abstract

An O2-bearing low-Ce RE material with high performance and multiple purposes is a composite oxide consisting of cerium oxide, zirconium oxide and assistant chosen from lanthanum oxide, strontium oxide and yttrium oxide. It is prepared through codeposition and calcining at 500-600 deg.C. It can be used as the carrier and assistant of the catalyst for cleaning the tail gas of car.

Description

1. Technical field [0001] The invention relates to the technical field of oxygen storage materials, and more particularly, to the technical field of oxygen storage materials used as a carrier and an auxiliary agent for an internal combustion engine exhaust gas purification catalyst. 2. Background technology [0002] Vehicle exhaust is the main source of air pollution. The pollutants mainly include hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NO). x ), in addition, there are harmful substances such as sulfur dioxide. These harmful substances directly endanger people's physical and mental health and cause serious pollution to the environment. All countries in the world have invested a lot of manpower, material resources and financial resources to control automobile exhaust pollution. Most countries have formulated automobile exhaust emission standards and are becoming more and more strict, requiring that all motor vehicle exhaust emissions must meet the required ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10
Inventor 陈耀强龚茂初王敏赵明
Owner SINOCAT ENVIRONMENTAL TECH
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