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Porous yttrium-cerium-zirconium solid solution and preparation method thereof

A technology of cerium-zirconium solid solution and aqueous solution, which is applied in the field of porous yttrium-cerium-zirconium solid solution and its preparation, can solve the problems of small specific surface area and sintering, and achieve the effect of large specific surface area, high degree of crystallization, and easy industrial operation

Inactive Publication Date: 2010-02-03
SHANGHAI HUAMING HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using nitrate as raw material, sodium hydroxide as precipitant, and cetyltrimethylammonium chloride as template, a mesoporous cerium-zirconium-aluminum composite oxide was prepared through precipitation reaction, drying, roasting and other processes. Solid solution, the specific surface area of ​​the sample after roasting at 450°C is relatively large, but the average pore diameter is only 2.5-3.4nm, and the small pores are sintered after high-temperature aging, and the specific surface area after aging is small

Method used

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  • Porous yttrium-cerium-zirconium solid solution and preparation method thereof
  • Porous yttrium-cerium-zirconium solid solution and preparation method thereof
  • Porous yttrium-cerium-zirconium solid solution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 0.4g ammonium persulfate and 0.8g NaHCO to the four-neck flask 3 and 120mL of distilled water, stirred for 10min, added 20mL of styrene monomer, and passed nitrogen into the four-necked flask for protection, raised the temperature to 70°C and reacted for 1h, then added 4g of γ-(methacryloyloxy)propyltrimethoxy base silane, continue to react for 9h, after the reaction is completed, cool and stand still to obtain a white emulsion, which is ready for use.

[0043] Take the above white emulsion, add water to make active polystyrene microspheres 0.2g mL-1 200mL of active polystyrene emulsion was poured into a three-necked flask equipped with a condenser and a stirrer at a stirring speed of 100rpm, and 1000mL of deionized water and 18g of polyethylene glycol 4000 were added.

[0044] 90mL concentration is 0.5mol L -1 cerous chloride aqueous solution, 45mL concentration is 1mol L -1 zirconium oxychloride aqueous solution and 100mL concentration is 0.1mol L -1 Add the yt...

Embodiment 2

[0046] Add 0.4g ammonium persulfate, 0.1g sodium dodecylbenzenesulfonate and 120mL distilled water into the four-necked flask, stir for 10min, add 20mL styrene monomer, and pass nitrogen into the four-necked flask for protection, and heat up to After reacting at 70°C for 1 hour, add 4 g of γ-(methacryloyloxy)propyltrimethoxysilane and continue the reaction for 9 hours. After the reaction is completed, cool and stand still to obtain a white emulsion for use.

[0047] Take the above-mentioned white emulsion, adjust and make active polystyrene microspheres 0.23g mL -1 200mL of active polystyrene emulsion was poured into a three-necked flask equipped with a condenser and a stirrer at a stirring speed of 100rpm, and 1000mL of deionized water and 20g of polyethylene glycol 2000 were added.

[0048] 120mL concentration is 0.5mol L -1 cerous nitrate aqueous solution, 60mL concentration is 0.5mol L -1 zirconyl nitrate aqueous solution and 50mL concentration is 0.2mol L -1 Add the yt...

Embodiment 3

[0050] Add 0.4g ammonium persulfate and 0.8g KHCO to the four-necked flask 3 and 120mL of distilled water, stirred for 10min, then added 20mL of styrene monomer, and passed nitrogen into the four-necked flask for protection, raised the temperature to 70°C and reacted for 1h, then slowly added 4g of γ-(methacryloyloxy)propyl Trimethoxysilane was continued to react for 9 hours, and after the reaction was completed, it was cooled and left still to obtain a white emulsion for use.

[0051] Take the above white emulsion, add water to make active polystyrene microspheres 0.25g mL -1 200mL of active polystyrene emulsion was poured into a three-necked flask equipped with a condenser tube and a stirrer at a stirring speed of 100rpm, and 1000mL of deionized water and 20g of polyethylene glycol 4000 were added.

[0052] The 50mL concentration is 1mol·L -1 cerous nitrate aqueous solution, 40mL concentration is 1mol L -1 zirconyl nitrate aqueous solution and 25mL concentration is 0.4mol...

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Abstract

The invention provides porous yttrium-cerium-zirconium solid solution and a preparation method thereof; the structural general formula of the porous yttrium-cerium-zirconium solid solution is as follows: Ce<x>Zr<0.9-x>Y<0.1>O2. The preparation method comprises the following steps: adding protective agent, mixed metal salt solution and activity polystyrene microballoon emulsion into precipitator, reacting for 1-2 hours in the normal temperature, ageing for 1-3 hours in the temperature of 80-100 DEG C, collecting precipitate, washing, dried for 1-5 hours in the temperature of 80-150 DEG C, roasting dry products for 1-6 h in the temperature of 300-1000 DEG C to obtain the porous yttrium-cerium-zirconium solid solution. The invention has higher specific surface area, heat stability, excellentchemical activity, high oxygen storage capability and high temperature heat stability, and has wide application in automobile exhaust cleaning catalyst, catalytic combustion catalyzer and other catalyzers.

Description

technical field [0001] The invention relates to a porous yttrium-cerium-zirconium solid solution and a preparation method thereof, in particular to a porous yttrium-cerium-zirconium solid solution used as an automobile tail gas purification catalyst and other catalytic materials. Background technique [0002] Harmful components in automobile engine exhaust mainly include CO, HC and NO x , not only seriously pollute the atmosphere and deteriorate the environment, but also directly threaten people's health. Automobile exhaust catalytic purification technology is one of the most effective and reliable technologies for treating automobile pollutants today, and the three-way catalyst can convert CO, HC, NO x Catalysts for purifying automobile exhaust at the same time. Currently of particular importance and key role in this type of catalyst is cerium oxide (CeO 2 ) and zirconia (ZrO 2 ) two components. Cerium oxide due to the presence of Ce 3+ and Ce 4+ It has been widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06B01J35/10B01J37/03B01J37/08B01D53/94C10L9/10
Inventor 马新胜李维勇高玮蔡梦军李鹏吴秋芳
Owner SHANGHAI HUAMING HI TECH GRP
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