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Three-dimensional ordered macroporous oxygen-deficient cerium dioxide catalyst, preparation method and applications thereof

A ceria, three-dimensional ordered technology, which is applied in the field of environmental catalysis and the preparation of inorganic metal catalyst materials, can solve the problems of poor catalytic stability and low activity, and achieves low cost, improved carbon deposition resistance, and good photothermal catalysis. The effect of activity and stability

Active Publication Date: 2020-04-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adjusting the morphology, oxygen vacancies and acidic sites of the catalyst, the method makes the pores of the prepared ceria uniform and orderly, and rich in oxygen vacancies and weakly acidic sites, which is beneficial to the adsorption of reactants and oxygen activation, and improves its The catalytic activity and anti-coking ability in the photothermal catalytic process solve the problems of low activity and poor catalytic stability of traditional ceria catalysts

Method used

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  • Three-dimensional ordered macroporous oxygen-deficient cerium dioxide catalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] S1. Take equimolar (2mmol) cerium nitrate hexahydrate and citric acid monohydrate powder into a glass beaker, add 1.2mL alcohol solution (the volume ratio of ethylene glycol and methanol is 1:1), and obtain a uniform and transparent solution after ultrasonication at room temperature for 1h. Solution A.

[0027] S2, immerse 0.5g of PMMA microsphere powder (diameter is 300nm) in solution A, ultrasonically mix for 5min, after 12h in the dark, carry out vacuum filtration with sand core filter device, to remove excess liquid, obtain solid B , and vacuum-dried the solid B at 60°C for 12h, then moved it into a tube furnace, calcined at 130°C for 1h under an argon atmosphere, then raised the temperature to 600°C at a rate of 1°C / min, and calcined at 600°C for 5h, Then calcined at 600 °C in air for 3 h to obtain solid C.

[0028] S3. Move the obtained solid C into a fixed-bed reactor, use a nitrogen bubbling device to control the humidity in the reactor to 30%, and calcinate at...

Embodiment 2

[0030] S1. Put 2 mmol of cerium nitrate hexahydrate and 8 mmol of citric acid monohydrate powder into a glass beaker, add 2.5 mL of alcohol solution (the volume ratio of ethylene glycol and methanol is 1:5), and obtain a uniform transparent solution A after ultrasonication at room temperature for 0.5 h.

[0031] S2, immerse the PMMA microsphere powder (diameter is 200nm) of 1g in solution A, ultrasonically mix 5min, after dark place 24h, carry out vacuum suction filtration with sand core filter device, to remove excess liquid, obtain solid B, The solid B was vacuum dried at 30°C for 96h, then moved into a tube furnace, calcined at 100°C for 3h under an argon atmosphere, then raised to 400°C at a rate of 5°C / min, and calcined at 400°C for 36h, then Calcined at 400°C for 36h in air to obtain solid C.

[0032] S3. Move the obtained solid C into a fixed-bed reactor, use a nitrogen bubbling device to control the humidity in the reactor to 80%, and calcinate at 400°C in an atmospher...

Embodiment 3

[0034] S1. Take 2 mmol of cerium nitrate hexahydrate and 0.5 mmol of citric acid monohydrate powder into a glass beaker, add 1 mL of ethanol solution, and obtain a uniform transparent solution A after ultrasonication at room temperature for 0.5 h.

[0035] S2. Immerse 0.4g of PMMA microsphere powder (diameter is 500nm) in solution A, mix ultrasonically for 5min, and after standing in the dark for 8h, vacuum filter with a sand core filter to remove excess liquid to obtain solid B , and vacuum-dried the solid B at 80°C for 1h, then moved it into a tube furnace, calcined at 130°C for 1h under an argon atmosphere, then raised the temperature to 800°C at a rate of 5°C / min, and calcined at 800°C for 2h, Then it was calcined at 800 °C in air for 6 h to obtain solid C.

[0036] S3. Move the obtained solid C into a fixed-bed reactor, use a nitrogen bubbling device to control the humidity in the reactor to 20%, and calcinate at 600°C in an atmosphere of hydrogen-nitrogen mixed gas (the ...

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Abstract

The invention belongs to the field of environmental catalysis and preparation of inorganic metal catalyst materials, and discloses a three-dimensional ordered macroporous oxygen-deficient cerium dioxide catalyst, a preparation method and applications thereof. The catalyst is prepared by adopting a polymethyl methacrylate (PMMA) colloidal crystal template method, calcining in a reducing / oxidizing atmosphere and treating with water vapor, and shows excellent activity and excellent stability in photo-thermal catalytic purification of typical atmospheric pollutants such as styrene, n-hexane, cyclohexane and the like. The method has the characteristics of cheap and easily available raw materials and simple preparation process, and the obtained material has characteristics of controlled oxygen vacancy, controlled surface acid amount, controlled acid strength, excellent photo-thermal catalytic performance and the like.

Description

technical field [0001] The invention belongs to the field of preparation of environmental catalysis and inorganic metal catalyst materials, and in particular relates to a three-dimensional ordered macroporous oxygen-deficient ceria catalyst and its preparation method and application. Background technique [0002] A large number of literatures have confirmed the high efficiency of photothermocatalytic purification of volatile organic compounds (VOCs). The core of photothermal catalysis technology is the development of highly active and highly stable catalysts. Ceria itself has excellent optical properties, oxygen storage and release capacity, and thermal stability, and is widely used in the field of photothermal catalysis. However, in the process of processing some refractory VOCs, such as benzene series, linear alkanes, and cycloalkanes, the mineralization temperature required is high, and a large number of intermediate products are formed rapidly. active, seriously affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/72C01F17/235
CPCB01J23/10B01J35/004B01D53/8668B01D2255/802B01D2257/708B01J37/343B01J37/105B01J37/088B01J37/0203B01J37/0018B01J35/1076B01J6/001B01J8/0285B01J37/0201
Inventor 安太成孔洁静李桂英
Owner GUANGDONG UNIV OF TECH
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