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A palladium-based catalyst for thermocatalytic formaldehyde degradation

A formaldehyde degradation and catalyst technology, which is applied in the field of thermal catalytic materials and environmental protection, can solve the problems of high catalyst manufacturing cost, limitation, high-temperature calcination, etc., and achieve the effect of improving capacity, convenient operation and mild preparation conditions

Active Publication Date: 2021-04-02
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above prepared Pd / TiO 2 There are certain restrictions, such as the amount of Pd used is relatively large, all of which are 1w.t.% of Pd; in addition, during the preparation process, high-temperature calcination is required
[0005] Although the Pd / TiO2 catalyst prepared by the above method has the performance of catalyzing and decomposing formaldehyde better, it still faces some problems, such as the high content of Pd used, the addition of other additives, and the need for high-temperature calcination during the preparation process. These make the manufacturing cost of the catalyst higher, which will be limited in practical application

Method used

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  • A palladium-based catalyst for thermocatalytic formaldehyde degradation
  • A palladium-based catalyst for thermocatalytic formaldehyde degradation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of palladium base catalyst preparation method that is used for thermocatalytic formaldehyde degradation: (1) get 0.5gTiO 2 Place in a fixed-bed reduction reaction tube; (2) rise to 300°C at room temperature at a heating rate of 10°C / min, and carry out hydrogen reduction at different temperatures for 3 hours, and then continue to pass hydrogen to cool naturally to room temperature; (3) absorb Add 0.4ml of 10mg / ml palladium nitrate solution into the three-necked flask, then add pure water, and keep stirring; (4) under stirring, add reduced anatase (TiO 2 ) solid, stirred and reacted for 1h; (5) then added dropwise 1mol / L NaOH solution until the pH of the solution was 10; (6) weighed 0.0071g NaBH 4 Solid, add 10ml pure water to prepare NaBH 4 Solution, dropwise added to the aforementioned solution, continue to stir and react for 2 hours; (7) After the reaction is completed, centrifuge the solution at 8000 rpm for 5 minutes, wash with deionized water, repeat the cen...

Embodiment 2

[0029] A kind of palladium base catalyst preparation method that is used for thermocatalytic formaldehyde degradation: (1) get 0.5gTiO 2 Place in a fixed-bed reduction reaction tube; (2) Rise to 400°C at room temperature at a heating rate of 10°C / min, and carry out hydrogen reduction at different temperatures for 3 hours, and then continue to cool to room temperature naturally with hydrogen; (3) Absorb Add 0.4ml of 10mg / ml palladium nitrate solution into the three-necked flask, then add pure water, and keep stirring; (4) under stirring, add reduced anatase (TiO 2 ) solid, stirred and reacted for 1h; (5) then added dropwise 1mol / L NaOH solution until the pH of the solution was 10; (6) weighed 0.0071g NaBH 4 Solid, add 10ml pure water to prepare NaBH 4 Solution, dropwise added to the aforementioned solution, continue to stir and react for 2 hours; (7) After the reaction is completed, centrifuge the solution at 8000 rpm for 5 minutes, wash with deionized water, repeat the centri...

Embodiment 3

[0031] A kind of palladium base catalyst preparation method that is used for thermocatalytic formaldehyde degradation: (1) get 0.5gTiO 2 Placed in a fixed bed reduction reaction tube; (2) Under the condition of a heating rate of 10 °C / min, the room temperature was raised to 500 °C, and hydrogen reduction was performed at different temperatures for 3 hours, and then continued to cool to room temperature naturally with hydrogen; (3) absorb Add 0.2ml of 10mg / ml palladium nitrate solution into the three-necked flask, then add pure water, and continue to stir; (4) under stirring, add reduced anatase (TiO 2 ) solid, stirred and reacted for 1h; (5) then added dropwise 1mol / L NaOH solution until the pH of the solution was 10; (6) weighed 0.0071g NaBH 4 Solid, add 10ml pure water to prepare NaBH 4 Solution, dropwise added to the aforementioned solution, continue to stir and react for 2 hours; (7) After the reaction is completed, centrifuge the solution at 8000 rpm for 5 minutes, wash ...

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Abstract

The invention discloses a palladium-based catalyst for thermocatalytic formaldehyde degradation. In the Pd / TiO2 catalyst, mass fraction of Pd is 0.1%-0.4%, on the basis of the weight of catalyst being100%. A preparation method comprises the following steps: 1) performing reduction treatment on a TiO2 carrier; 2) adding a defined amount of TiO2 into a palladium nitrate solution; 3) regulating pH of the solution and reducing; 4) drying the acquired mixture, thereby acquiring the required Pd / TiO2 catalyst for formaldehyde oxidation. The preparation method disclosed by the invention is simple; the prepared Pd / TiO2 catalyst has an anatase (ATiO2) phase structure; the formed Pd / TiO2 shows an excellent catalytic performance for formaldehyde oxidation.

Description

technical field [0001] The invention relates to a palladium-based catalyst for thermocatalytic formaldehyde degradation and a preparation method thereof, belonging to the technical field of thermocatalytic materials and environmental protection. Background technique [0002] Formaldehyde is one of the most harmful gases in the indoor environment. Designing and preparing efficient and stable catalysts to achieve catalytic oxidation of formaldehyde under mild conditions has always been one of the important research contents in the field of environmental catalysis. However, at present, among the catalysts used in thermal catalytic reactions, non-metal supported catalysts have poor catalytic effect, while noble metal supported catalysts have better effects, but there are high amounts of precious metals, poor dispersion of precious metals, poor stability, etc. question. [0003] TiO 2 As thermocatalytic supports, they have been extensively studied. For the thermocatalytic degr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01D53/86B01D53/72
CPCB01D53/8668B01J23/44
Inventor 纪红兵王旭裕芮泽宝
Owner SUN YAT SEN UNIV
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