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Preparation method of rare earth Yt doped zirconium crosslinking montmorillonite

A montmorillonite, yttrium-doped technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc.

Inactive Publication Date: 2009-03-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, there have been many reports that doping yttrium can improve the stability and catalytic oxidation activity of the catalyst, but doping the rare earth element yttrium on the basis of zirconium-based pillared montmorillonite Not yet reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Refer to the above preparation steps

[0017] ①Mix the Ca-type montmorillonite initial material with 1.0mol / L NaCl solution and Ca-type montmorillonite. The amount of NaCl solution in 1g of montmorillonite is 100mL. Stir vigorously at 60°C for 6 hours, centrifuge, and use The precipitate was washed with deionized water to be free of Cl - (AgNO 3 detection), and dried at 110°C to obtain Na-type montmorillonite (Na-MMT).

[0018] ② ZrOCl 2 ·8H 2 O and Y (NO 3 ) 3 ·6H 2 O, make a solution with deionized water according to Zr:Y ratio of 5:1 (molar ratio), control [Zr]=1.0mol / L, stir magnetically for 2 hours at 80°C to 90°C, and age at constant temperature for 4 hours, Cool to room temperature to obtain the rare earth yttrium-doped zirconium composite crosslinking agent.

[0019] ③ The sodium-type montmorillonite obtained in ① was prepared into a suspension with a mass percentage of 1 wt%, and magnetically stirred at 60-70° C. for 0.5 hours.

[0020] ④ According to ...

Embodiment 2

[0023] raw material:

[0024] Yttrium nitrate-Y(NO 3 ) 3 ·6H 2 o

[0025] Zirconium oxychloride-ZrOCl 2 ·8H 2 o

[0026] Ca-type montmorillonite-inner montmorillonite (Ca-type), layer spacing is 1.522252nm, cation exchange capacity is 108.4mmol / 100g; mineral composition is mainly montmorillonite, content is more than 95%, contains trace quartz; crystal The chemical formula is (Ca 0.39 Na 0.02 K 0.02 )(Si 7.91 al 0.09 )(Al 2.51 Fe 0.45 Mg 1.10 )O 20 (OH) 4 ·nH 2 O; adsorption capacity PNP>=350mg / g.

[0027] The preparation steps are:

[0028] 1. Sodium exchange

[0029] Weigh 175.32g of NaCl, dissolve it in 3000ml of deionized water, and make a solution of 1.0mol / L. Then add 30 g of Ca-type inner montmorillonite raw material, stir vigorously at 60 ° C for 6 hours, cool to room temperature, pour off the upper clear night, add deionized water to stir evenly, centrifuge, and wash the precipitate with deionized water until it is free. Cl - (AgNO 3 detection),...

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Abstract

The invention relates to a preparation method of crosslinking montmorillonite of yttrium doped with zirconium in rare soil; the preparation method comprises the following steps: yttrium nitrate, zirconyl chloride and calcium-typed montmorillonite of Inner Mongolia are adopted as materials, three-step methods of sodium ion exchange of the montmorillonite, the preparation of a compound crosslinking agent of yttrium doped with zirconium in rare soil and column supporting of the compound crosslinking agent are carried out to obtain the crosslinking montmorillonite of yttrium doped with zirconium in rare soil; after the crosslinking montmorillonite is used for catalyzing and oxidizing a catalyst carrier of VOCs and loading 0.1wt% of palladium oxide which is the active component with low content to prepare a catalyst, the temperature of complete oxidation for catalyzing and oxidizing acetone, toluene and ethyl acetate is respectively 310 DEG C, 250 DEG C and 270 DEG C.

Description

technical field [0001] The invention relates to a preparation method of rare earth yttrium-doped zirconium crosslinked montmorillonite, and the modified montmorillonite is a catalyst carrier for catalytic oxidation of volatile organic compounds (VOCs). technical background [0002] Due to the unique two-dimensional interlayer pores, high specific surface area, surface acidity, high temperature resistance and other excellent properties of pillared clay mineral materials, they can be used as new catalysts and catalyst supports, which has aroused people's strong interest and great attention. The preparation of aluminum-based pillared clays and binary (CuAl, FeAl, ZrAl, SiAl) polymeric cationic pillared clays based on aluminum has been extensively and intensively studied. Compared with other Al-based and Ti-based pillared montmorillonites, zirconium-based pillared montmorillonite has the characteristics of strong thermal stability, high acid site, adsorption effect on organic ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/16B01J21/06
Inventor 陈敏齐灵燕周仁贤
Owner ZHEJIANG UNIV
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