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Low-temperature high-activity toluene catalytic oxidation catalyst, and preparation method and application thereof

A catalytic oxidation, high activity technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of limited resources and low activity, and achieve environmental pollution. Small, excellent activity, simple and convenient preparation method

Active Publication Date: 2021-10-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with transition metal oxides, noble metal catalysts such as Pt and Pd have excellent catalytic activity, but their resources are limited
In addition, high efficiency at low temperature is one of the important factors for an excellent catalyst, while the current catalysts for the catalytic oxidation of toluene are not very active in the low temperature region (<140°C)

Method used

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  • Low-temperature high-activity toluene catalytic oxidation catalyst, and preparation method and application thereof
  • Low-temperature high-activity toluene catalytic oxidation catalyst, and preparation method and application thereof
  • Low-temperature high-activity toluene catalytic oxidation catalyst, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 2.25mL 0.02mol / L H 2 PtCl 6 ·6H 2 O solution in ethylene glycol and 0.75mL 0.02mol / L IrCl 3 The ethylene glycol solution mixed with 2.4mL 0.25mol / L NaOH ethylene glycol solution was added dropwise to 15mL ethylene glycol solution in which 100mgPVP was dissolved, and the microwave irradiation method was used to react at 150°C for 30min, and the reaction The final solution was centrifuged once with acetone, and then centrifuged twice with ethanol and n-hexane, and the obtained alloy was dispersed in the ethanol solution, added to the cerium dioxide dispersed in the ethanol solution, the loading capacity was 0.6%, and stirred at room temperature 4h, evaporated to dryness in a water bath, dried in an oven at 110°C for 4h, ground evenly, then roasted in a muffle furnace at 200°C for 2h, and reduced in a hydrogen atmosphere at 200°C for 2h to obtain a platinum-iridium alloy catalyst Pt75Ir25 supported on ceria / CeO 2 .

[0030] The XRD of the sample is attached fig...

Embodiment 2

[0032] Take 2mL 0.02mol / L H 2 PtCl 6 ·6H 2 O solution in ethylene glycol and 1mL 0.02mol / L IrCl 3 The ethylene glycol solution mixed with 2.4mL 0.25mol / L NaOH ethylene glycol solution was added dropwise to 15mL ethylene glycol solution in which 100mg PVP was dissolved, and the microwave irradiation method was used to react at 150°C for 30min. The solution after the reaction was centrifuged once with acetone, and then centrifuged twice with ethanol and n-hexane, and the obtained alloy was dispersed in the ethanol solution, and added to the cerium dioxide dispersed in the ethanol solution, with a loading capacity of 0.6%, at room temperature Stir for 4 hours, evaporate to dryness in a water bath, dry in an oven at 110°C for 4 hours, grind evenly, then bake in a muffle furnace at 200°C for 2 hours, and then reduce in a hydrogen atmosphere at 200°C for 2 hours to obtain a platinum-iridium alloy catalyst supported on ceria Pt67Ir33 / CeO 2 .

[0033] The XRD of the sample is att...

Embodiment 3

[0035] Take 1.5mL 0.02mol / L H 2 PtCl 6 ·6H 2 O solution in ethylene glycol and 1.5mL 0.02mol / L IrCl 3 The ethylene glycol solution mixed with 2.4mL 0.25mol / L NaOH ethylene glycol solution was added dropwise to 15mL ethylene glycol solution in which 100mgPVP was dissolved, and the microwave irradiation method was used to react at 150°C for 30min, and the reaction The final solution was centrifuged once with acetone, and then centrifuged twice with ethanol and n-hexane, and the obtained alloy was dispersed in the ethanol solution, added to the cerium dioxide dispersed in the ethanol solution, the loading capacity was 0.6%, and stirred at room temperature 4h, evaporated to dryness in a water bath, dried in an oven at 110°C for 4h, ground evenly, then roasted in a muffle furnace at 200°C for 2h, and reduced in a hydrogen atmosphere at 200°C for 2h to obtain a platinum-iridium alloy catalyst Pt50Ir50 supported on ceria / CeO 2 .

[0036] The XRD of the sample is attached figur...

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Abstract

The invention discloses a low-temperature high-activity toluene catalytic oxidation catalyst, and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: adding an ethylene glycol mixed solution of chloroplatinic acid hexahydrate and iridium chloride and an ethylene glycol solution of sodium hydroxide into ethylene glycol dissolved with polyvinylpyrrolidone, preparing a platinum-iridium alloy by utilizing a microwave irradiation method, dispersing the centrifugally separated alloy into ethanol, loading the alloy on cerium dioxide at room temperature, drying, roasting and reducing to finally prepare the low-temperature high-activity toluene catalytic oxidation catalyst. The platinum-iridium alloy catalyst prepared by the method is used for catalytic oxidation of toluene and has excellent low-temperature catalytic activity, and the temperature of T50 of a Pt67Ir33 / CeO2 sample is only 121 DEG C. The catalyst and the preparation method thereof provided by the invention have a wide application prospect in the field of catalytic purification of VOCs.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and more specifically relates to a low-temperature high-activity catalytic oxidation toluene catalyst and a preparation method and application thereof. Background technique [0002] With the development of economy and society, the issue of ecological environment construction is becoming more and more important. Volatile organic compounds (VOCs) are one of the important sources of air pollution, which can produce ozone, smog, etc., affect the environment and climate, and cause serious air pollution. Among them, toluene, as a typical aromatic hydrocarbon compound, is widely used in the synthetic production of dyes, pesticides, spices, etc., but its emission will endanger the surrounding environment and human health. Therefore, it is very important to promote the governance of toluene. Among many treatment methods, the catalytic oxidation method has attracted much attention due to its advantages...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J37/34B01D53/72B01D53/86
CPCB01J23/63B01J37/346B01D53/8668B01D2257/7027B01D2257/708B01D2258/06
Inventor 董林张悦万海勤仝庆吴聪王志强
Owner NANJING UNIV
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