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A template-free preparation of ceo 2 mesoporous materials method and ceo 2 Mesoporous materials

A mesoporous material, template-free technology, applied in the direction of cerium oxide/cerium hydroxide, lanthanide oxides/hydroxides, rare earth metal oxides/hydroxides, etc., can solve the complex preparation process of mesoporous materials, High cost, high energy consumption and other problems, to achieve the effect of saving the roasting process, low cost and low energy consumption

Active Publication Date: 2021-03-16
LESHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a template-free preparation of CeO 2 Methods for Mesoporous Materials and CeO 2 Mesoporous materials to address existing CeO 2 The preparation process of mesoporous materials is complex, high cost, high energy consumption and easy to pollute

Method used

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  • A template-free preparation of ceo <sub>2</sub> mesoporous materials method and ceo <sub>2</sub> Mesoporous materials
  • A template-free preparation of ceo <sub>2</sub> mesoporous materials method and ceo <sub>2</sub> Mesoporous materials
  • A template-free preparation of ceo <sub>2</sub> mesoporous materials method and ceo <sub>2</sub> Mesoporous materials

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Embodiment 1

[0030] The template-free preparation of CeO in this embodiment 2 Methods for mesoporous materials, including:

[0031] At room temperature, the Ce(NO 3 ) 3 ·6H 2 O dissolves in distilled water to form Ce 3+ aqueous solution, followed by NH 4 HCO 3 Added to continuously stirring Ce 3+ In aqueous solution, a white precipitate is formed immediately: the first precursor. Take H 2 o 2 Add it into the solution, continue to stir for 30 minutes, and age for 3 hours to obtain the second precursor. Ce(NO 3 ) 3 ·6H 2 O, NH 4 HCO 3 and H 2 o 2The mass ratio is 1:0.64:0.35.

[0032] The second precursor was separated by centrifugation and washed 3 times with distilled water, after which the solid was dispersed in distilled water. The mass ratio of the second precursor to the distilled water is 1:36.3. The obtained solution was transferred to a hydrothermal kettle with a capacity of 50 mL and kept at 180 °C for 28 h. After the hydrothermal kettle was cooled, the collecte...

Embodiment 2

[0035] The template-free preparation of CeO in this embodiment 2 Methods for mesoporous materials, including:

[0036] At room temperature, the Ce(NO 3 ) 3 ·6H 2 O dissolves in distilled water to form Ce 3+ aqueous solution, followed by NH 4 HCO 3 Added to continuously stirring Ce 3+ In aqueous solution, a white precipitate is formed immediately: the first precursor. Take H 2 o 2 Add it into the solution, continue to stir for 30 minutes, and age for 3 hours to obtain the second precursor. Ce(NO 3 ) 3 ·6H 2 O, NH 4 HCO 3 and H 2 o 2 The mass ratio is 1:0.91:1.73.

[0037] The second precursor was separated by centrifugation and washed 3 times with distilled water, after which the solid was dispersed in distilled water. The mass ratio of the second precursor to the distilled water is 1:50.8. The obtained solution was transferred to a hydrothermal kettle with a capacity of 50 mL and kept at 220 °C for 20 h. After the hydrothermal kettle is cooled, collect the ...

Embodiment 3

[0040] The template-free preparation of CeO in this embodiment 2 Methods for mesoporous materials, including:

[0041] At room temperature, the Ce(NO 3 ) 3 ·6H 2 O dissolves in distilled water to form Ce 3+ aqueous solution, followed by NH 4 HCO 3 Added to continuously stirring Ce 3+ In aqueous solution, a white precipitate is formed immediately: the first precursor. Take H 2 o 2 Add it into the solution, continue to stir for 30 minutes, and age for 3 hours to obtain the second precursor. Ce(NO 3 ) 3 ·6H 2 O, NH 4 HCO 3 and H 2 o 2 The mass ratio is 1:0.73:1.21.

[0042] The second precursor was separated by centrifugation and washed 3 times with distilled water, after which the solid was dispersed in distilled water. The mass ratio of the second precursor to the distilled water is 1:43.6. The obtained solution was transferred to a hydrothermal kettle with a capacity of 50 mL and kept at 200 °C for 24 h. After the hydrothermal kettle was cooled, the collect...

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Abstract

The invention discloses a method for preparing a CeO2 mesoporous material with a high specific surface area without a template and the CeO2 mesoporous material, and belongs to the technical field of mesoporous material preparation. The method comprises the following steps: mixing a Ce(NO3)3.6H2O aqueous solution and NH4HCO3 to obtain a first precursor; adding H2O2 into the first precursor; stirring and performing ageing to obtain a second precursor; separating the second precursor from a solution and washing the second precursor; dispersing the second precursor in distilled water; performing hydrothermal treatment on the obtained solution; performing drying treatment to obtain the CeO2 mesoporous material. The preparation method disclosed by the invention is simple in process; a foreign template is not added so that secondary pollution caused by treating a template is avoided, and a roasting process is omitted and then energy consumption is reduced. The CeO2 mesoporous material prepared by the method is high in specific surface area and is up to 184 m<2> / g; moreover, the adopted raw materials NH4HCO3 and H2O2 are low in cost and easy to purchase, so that the CeO2 mesoporous material is beneficial to popularization and application.

Description

technical field [0001] The invention relates to the technical field of preparation of mesoporous materials, in particular to a template-free preparation of CeO 2 Methods for mesoporous materials and CeO 2 Mesoporous materials. Background technique [0002] CeO 2 As a well-known and important functional rare earth oxide, due to its good oxygen storage performance, it has been widely used in many reactions such as automobile exhaust purification, low-temperature oxidation conversion of CO, and conversion of alcohol vapor. CeO 2 Mesoporous materials are also often used as catalyst promoters or catalyst supports. with bulk CeO 2 Compared to CeO 2 Mesoporous materials have high specific surface area and ordered pore structure, which can provide more contact reaction sites for gas particles and catalyst supports, and also have better oxygen storage capacity. [0003] At present, the template method is the synthesis of mesoporous CeO 2 The main method of powder can be divid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/235
CPCC01P2002/72C01P2002/80C01P2004/04C01P2006/12C01P2006/14C01P2006/16C01F17/206
Inventor 徐要辉邓迟肖志刚陈昶范强
Owner LESHAN NORMAL UNIV
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