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Nano-catalyst, preparation method and application thereof for catalytic oxidation of toluene

A nano-catalyst and catalytic oxidation technology, applied in the field of environmental catalytic purification, can solve the problems of low low-temperature catalytic activity, complex preparation process, poor stability, etc., and achieve simple preparation technology and equipment, good morphology and structure, and good stability. Effect

Active Publication Date: 2020-09-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, single transition metal manganese oxides or mixed-phase oxides still have problems such as low low-temperature catalytic activity, poor stability, complex preparation process, difficulty in repeating, and high cost.

Method used

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  • Nano-catalyst, preparation method and application thereof for catalytic oxidation of toluene
  • Nano-catalyst, preparation method and application thereof for catalytic oxidation of toluene
  • Nano-catalyst, preparation method and application thereof for catalytic oxidation of toluene

Examples

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Effect test

Embodiment 1

[0019] α-MnO 2 Nano-catalyst preparation: using a one-step hydrothermal method. First, 3.16gKMnO 4 Dissolved in 35ml of water and stirred vigorously at 60°C, 4.536gH 2 C 2 o 4 2H 2 O was dissolved in 35ml of water. Next, with vigorous stirring, the H 2 C 2 o 4 2H 2 O solution was added dropwise to KMnO 4 In the solution, the mixed solution was stirred at 60°C for 30 minutes, then placed in a reaction kettle, and heated at a constant temperature of 120°C for 12 hours. The obtained material was centrifugally washed and dried in an oven at 80°C for 10 h, and finally the dried sample was baked in a muffle furnace at 400°C for 5 h. Catalyst A was prepared.

Embodiment 2

[0021] α@β-MnO 2 Preparation method of (17:3): α-MnO of the present invention according to Example 1 2 The preparation method of the nano-catalyst is to use 150°C instead of 120°C constant temperature water heating for 12h to prepare catalyst B.

Embodiment 3

[0023] α@β-MnO 2 (1:1) preparation method: α-MnO of the present invention according to Example 1 2 The preparation method of the nano-catalyst is to use 180° C. instead of 120° C. constant temperature water heating for 12 hours to prepare catalyst C.

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Abstract

The invention belongs to the technical field of environmental catalytic purification and provides a nanocatalyst for catalytic oxidation of toluene, a preparation method and an application. The catalyst preparation method is a one-step hydrothermal method. Oxalic acid solutions of different concentrations are used as reducing agents, and are added dropwise to the potassium permanganate solution, mixed and stirred, and then transferred to a reaction kettle for 100-240°C hydrothermal treatment for 12-24 hours. , then carry out suction filtration, washing, drying and roasting to obtain it. The gas generated by the thermal decomposition of oxalic acid enables the catalyst prepared by the invention to have a high specific surface area and rich pore structure, and the hydrothermal method enables the catalyst to have a stable morphological structure. At the same time, the mixed crystal catalyst in this catalyst has good toluene catalytic oxidation activity and stability. At around 200°C, the toluene removal efficiency can reach 99%, which has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental catalytic purification, and relates to α-, β- and mixed crystal α@β-MnO with different mass ratios for catalytic oxidation of toluene 2 Nano-catalyst, preparation method and its application in catalytic oxidation of toluene. Background technique [0002] With the development of modern industry, environmental pollution is becoming more and more serious, and the prevention of environmental pollution has become a major issue related to the national economy and people's livelihood. VOCs are mainly derived from fuel combustion, industrial manufacturing and solvent emissions, which are very harmful to humans, animals and even plants. As a common solvent and additive, toluene is irritating to human skin and mucous membranes. Inhalation of high concentrations of toluene It can also cause acute poisoning, and long-term exposure can also cause neurological diseases. It is a major VOCs pollutant. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J37/10B01J37/08B01D53/86B01D53/72
CPCB01D53/8668B01J23/34B01J37/082B01J37/10B01D2258/06B01D2257/7027B01J35/23
Inventor 曲振平黄娜王奕
Owner DALIAN UNIV OF TECH