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CeO2 mesocrystals as well as preparation method and application thereof

A technology of mesoscopic crystals and mixed solutions, applied in chemical instruments and methods, catalyst carriers, chemical/physical processes, etc., can solve problems such as high cost and pollute the environment, and achieve good crystallinity, good monodispersity, and high yield. high effect

Active Publication Date: 2017-03-22
MINJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the reported mesoscopic crystal preparation methods need to introduce organic additives, which is not only expensive, but also pollutes the environment

Method used

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  • CeO2 mesocrystals as well as preparation method and application thereof
  • CeO2 mesocrystals as well as preparation method and application thereof
  • CeO2 mesocrystals as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 7.68 g of ceric ammonium nitrate and 5.97 g of sodium sulfate in 50 mL of deionized water, calibrate the above mixed solution to 70 mL with deionized water, and then transfer it to a high-temperature reactor with a volume of 100 mL (that is, the molar concentration of ceric ammonium nitrate 0.2 mol / L, the molar ratio of ammonium cerium nitrate to sodium sulfate is 1:3). The reaction kettle was put into a blast drying oven, the reaction temperature was controlled at 150 °C, and the reaction time was 5 h. The obtained product was washed by centrifugation to remove impurity ions and then dried at 60 °C for 8 h to obtain CeO 2 mesoscopic crystals.

[0024] figure 1 It is the CeO prepared in this example 2 XRD patterns of mesoscopic crystals. Depend on figure 1 It can be seen that the product prepared in this embodiment is pure CeO 2 .

[0025] figure 2 It is the CeO prepared in this example 2 SEM images of mesoscopic crystals. Depend on figure 2 It can...

Embodiment 2

[0029] Dissolve 7.68 g of ceric ammonium nitrate, 0.11 g of ammonium nitrate, and 7.32 g of potassium sulfate in 50 mL of deionized water, calibrate the above mixed solution to 70 mL with deionized water, and transfer it into a high-temperature reaction kettle with a volume of 100 mL (ie The molar concentration of ammonium cerium nitrate is 0.2 mol / L, and the molar ratio of ammonium cerium nitrate, ammonium nitrate and potassium sulfate is 1:0.1:3). The reaction kettle was put into a blast drying oven, the reaction temperature was controlled at 170 °C, and the reaction time was 24 h. The obtained product was washed by centrifugation to remove impurity ions and then dried at 60 °C for 8 h to obtain CeO 2 mesoscopic crystals.

[0030] Figure 5 It is the CeO prepared in this example 2 SEM images of mesoscopic crystals. from Figure 5 It can be seen that the prepared CeO 2 The particles are also nano-spherical mesoscopic crystals, and the diameter of the sphere is about 300...

Embodiment 3

[0032] Dissolve 7.68 g of ceric ammonium nitrate, 0.22 g of ammonium nitrate, and 5.55 g of ammonium sulfate in 50 mL of deionized water, calibrate the above mixed solution to 70 mL with deionized water, and transfer it to a high-temperature reaction kettle with a volume of 100 mL (i.e. The molar concentration of ammonium cerium nitrate is 0.2 mol / L, and the molar ratio of ammonium cerium nitrate, ammonium nitrate and ammonium sulfate is 1:0.2:3). The reaction kettle was put into a blast drying oven, the reaction temperature was controlled at 200 °C, and the reaction time was 72 h. The obtained product was washed by centrifugation to remove impurity ions and then dried at 60 °C for 8 h to obtain CeO 2 mesoscopic crystals.

[0033] Image 6 It is the CeO prepared in this example 2 SEM images of mesoscopic crystals. from Image 6 It can be seen that the prepared CeO 2 The particles are also nano-spherical mesoscopic crystals, and the diameter of the sphere is about 200-600...

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Abstract

The invention discloses CeO2 mesocrystals as well as a preparation method and application thereof, and belongs to the field of preparation of metallic oxide functional materials. The preparation method comprises the following steps: dissolving ceric ammonium nitrate, ammonium nitrate and soluble sulfate into water according to a ratio to form a mixed solution, and enabling hydrothermal reaction at 150 to 200 DEG C for 5 to 72 hours to prepare the CeO2 mesocrystals. The preparation method is simple, feasible and low in cost; no organic additives are added, so that the preparation method goes green and is environmentally friendly. The prepared CeO2 mesocrystals are high in monodispersity and spherical and are internally provided with a plurality of pores; the CeO2 mesocrystals are high-quality water-gas shift catalyst vectors.

Description

technical field [0001] The invention belongs to the field of preparation of metal oxide functional materials, in particular to a CeO 2 Mesoscopic crystals and their preparation methods and applications. Background technique [0002] Ceria (CeO 2 ) is an inexpensive light rare earth oxide with excellent oxygen storage capacity (OSC), Ce 3+ with Ce 4+ The rapid switching ability between them, as well as the advantages of more oxygen vacancies (Oxygen Vacancy), are widely used as supports or additives for the preparation of catalysts, such as automobile exhaust purification catalysts. [0003] Mesoscopic crystals (referred to as mesogens) are a new type of crystals that are different from traditional polycrystals and single crystals. Generally, nanocrystals are self-assembled according to a certain orientation to form crystals with superstructures. There are usually a large number of stacked pores inside and can Shows single crystal-like electron diffraction behavior. As a...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00B01J23/10B01J32/00B01J23/83
CPCB01J23/002B01J23/10B01J23/83C01F17/206C01P2002/01C01P2002/70C01P2002/72C01P2004/03C01P2004/32C01P2004/62
Inventor 张燕杰王晶晶李红豆林棋娄本勇郑国才
Owner MINJIANG UNIV
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