Preparation method of cerium oxysulfide porous nano-sheets

A technology of cerium sulfide and nanosheets, which is applied in chemical instruments and methods, nanotechnology, rare earth metal sulfides, etc., can solve problems such as the difficulty in preparing pure-phase cerium oxysulfide nanomaterials, and achieve improved specific surface area, reaction conditions and devices simple effect

Inactive Publication Date: 2017-12-01
GUANGXI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem that the preparation of pure-phase cerium oxysulfide nanomaterials is difficult in the prior art, and provides a method of using cheap cerium salts and thiourea compounds as precursors to prepare pure-phase cerium oxysulfide porous nanomaterials through hydrothermal reaction and heat treatment. sheet, aiming to obtain a preparation method of cerium oxysulfide nanosheets with low cost, easy realization and good product quality

Method used

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Embodiment 1

[0025] A preparation method of porous cerium oxysulfide nanosheets, the operation steps are as follows:

[0026] (1) Take by weighing 2.5mmol of cerium acetate, join in 20ml of deionized water, stir to fully dissolve cerium acetate in deionized water, obtain a cerium acetate solution containing cerium ion molar concentration of 0.125mol / L, weigh 1.25mmol Add thiourea to the obtained cerium acetate solution and mix, stir evenly, then add 15ml of ethylene glycol amine to the mixture of thiourea and cerium acetate solution, stir evenly, then transfer to a polytetrafluoroethylene hydrothermal kettle for sealing, Heating, when the temperature rises to 250°C, keep it warm for 24 hours to carry out hydrothermal reaction, and cool to room temperature;

[0027] (2) Suction filter the material obtained after cooling in step (1), take the filter residue, wash away the unreacted ethylene glycol amine with deionized water, dry the obtained filter residue after cleaning until the moisture i...

Embodiment 2

[0029] A preparation method of porous cerium oxysulfide nanosheets, the operation steps are as follows:

[0030] (1) take by weighing the cerium nitrate of 2.08mmol, join in the deionized water of 20ml, stir and make cerium nitrate fully dissolve in deionized water, obtain the cerium nitrate solution that the molar concentration of cerium ion is 0.104mol / L, weigh 1.25mmol Add ethylene thiourea to the obtained cerium nitrate solution and mix, stir evenly, then add 15ml of ethylene glycol amine into the mixture of ethylene thiourea and cerium nitrate solution, stir evenly, then transfer to a polytetrafluoroethylene hydrothermal kettle Seal, heat, keep warm for 30 hours when the temperature rises to 180°C for hydrothermal reaction, and cool to room temperature;

[0031] (2) Suction filter the material obtained after cooling in step (1), take the filter residue, wash away the unreacted ethylene glycol amine with deionized water, dry the obtained filter residue after cleaning until...

Embodiment 3

[0033] A preparation method of porous cerium oxysulfide nanosheets, the operation steps are as follows:

[0034] (1) take by weighing the cerium chloride of 3.0mmol, join in the deionized water of 20ml, stir and make cerium chloride fully dissolve in deionized water, obtain the cerium chloride solution that contains cerium ion molar concentration and be 0.15mol / L, weigh Take 2.4mmol of thiouracil and add it to the obtained cerium chloride solution and mix, stir evenly, then add 15ml of ethylene glycol amine into the mixture of thiouracil and cerium chloride solution, stir evenly, and then transfer to the polytetrafluoroethylene Seal it in an ethylene hydrothermal kettle, heat it, keep it warm for 24 hours when the temperature rises to 185°C, and carry out hydrothermal reaction, and cool to room temperature;

[0035] (2) Suction filter the material obtained after cooling in step (1), take the filter residue, wash away the unreacted ethylene glycol amine with deionized water, dr...

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Abstract

The invention discloses a preparation method of cerium oxysulfide porous nano-sheets. The preparation method includes the steps: (1) mixing thiourea group compounds and cerium salt solution, adding ethylene glycol amine into mixture of the thiourea group compounds and the cerium salt solution, and performing hydrothermal reaction and cooling; (2) filtering substances acquired after cooling of mixture in the step (1), cleaning and drying filter residues, performing hydrothermal reaction and cooling, and collecting samples to obtain the cerium oxysulfide porous nano-sheets. According to the method, cheap cerium salt, thiourea and the like serve as precursors, cerium oxysulfide is prepared by the aid of hydrothermal reaction and heat treatment, the prepared cerium oxysulfide is provided with pure-phase mono-crystal nano-sheets, the nano-sheets have mutually penetrated holes, so that the specific surface area of a cerium oxysulfide material is improved, and the preparation method is simple in reaction condition and device, simple, convenient, easy, economical and environmentally friendly and has great potential practical values.

Description

technical field [0001] The invention relates to the field of oxygen storage materials, in particular to a preparation method of porous nanosheets of cerium oxysulfide. Background technique [0002] Oxygen storage materials can store a large amount of gaseous oxygen in an oxidizing atmosphere and release oxygen in a reducing atmosphere. It is one of the key materials for the three-way catalyst for automobile exhaust purification, which determines the performance and service life of the catalyst [Journal of China Nonferrous Metals Society , 2013, 6, 1575; Rare Earth, 2010, 3, 75]. Traditional oxygen storage materials are mainly cerium-based oxygen storage materials, such as CeO 2 , CeO 2 -ZrO 2 solid solution, but due to its weak oxygen storage capacity, large-capacity oxygen storage material Ln has been developed in recent years 2 o 2 SO 4 (Ln=La, Pr, Nd, Sm), using S 6+ and S 2+ between valence states to store and release oxygen, but Ln 2 o 2 SO 4 There are defect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y40/00
CPCB82Y40/00C01F17/294C01P2002/70C01P2002/72C01P2004/03C01P2004/04C01P2004/20
Inventor 朱金良沈培康马少健
Owner GUANGXI UNIV
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