Preparation and application method of VOx-MoOx/TiO2 catalyst for degrading dioxin at low temperature

A catalyst, dioxin technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of general dioxin catalytic efficiency, etc. Catalytic removal efficiency, lowering initial reduction temperature, lowering effect of activation energy

Pending Publication Date: 2021-12-10
ZHEJIANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Under relatively low temperature (150-190°C) conditions, the catalytic efficiency of these catalysts for dioxins is relatively general, for example, the degradation efficiency of V-Ti catalysts for dioxins at 160°C is relatively lower by 50% or more than that at 300°C

Method used

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  • Preparation and application method of VOx-MoOx/TiO2 catalyst for degrading dioxin at low temperature
  • Preparation and application method of VOx-MoOx/TiO2 catalyst for degrading dioxin at low temperature
  • Preparation and application method of VOx-MoOx/TiO2 catalyst for degrading dioxin at low temperature

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preparation Embodiment 1

[0026] VO x -MoO x / TiO 2 The preparation method of powder catalyst:

[0027] (1) Dissolve ammonium metavanadate in ethanolamine to obtain ammonium metavanadate solution, and dissolve ammonium molybdate tetrahydrate in deionized water to obtain ammonium molybdate solution; when preparing the solution, use a 50°C water bath to heat it, and use a magnetic Stir well to promote dissolution; then mix the two to make a precursor solution;

[0028] (2) Combine the precursor solution with nano-TiO 2 The carrier is mixed and stirred to obtain a viscous paste; after the paste is left to stand for 36 hours, it is dried at 105°C for 24 hours; the mass ratio of each raw material component is, nano-TiO 2 : Ammonium metavanadate: Ammonium molybdate tetrahydrate = 6: 0.429: 0.409.

[0029] (3) The dried block material was crushed and passed through a 60-mesh screen, and calcined at 450°C for 3 hours in an air atmosphere to obtain VO x -MoO x / TiO 2 Powder catalyst; during calcination,...

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Abstract

The invention relates to the technical field of building materials, and aims to provide preparation and application method of a VOx-MoOx/TiO2 catalyst for degrading dioxin at low temperature. The preparation method comprises the following steps: mixing an ammonium metavanadate solution and an ammonium molybdate solution to prepare a precursor solution, mixing the precursor solution with a nano TiO2 carrier, and stirring to obtain viscous paste; and standing, drying, crushing, sieving and calcining to obtain the powder catalyst. By adding the active component MoOx to modify the VOx/TiO2 catalyst, the initial reduction temperature of the catalyst is reduced, the activation energy required by chemical reaction is reduced, and the catalytic removal efficiency of dioxin is obviously improved. The conversion rate of VOCs is obviously higher than that of other V-Ti catalysts, and the conversion rate at the temperature of 250 DEG C reaches 90% or above. The raw materials are low in price, the preparation process is simple, batch forming can be achieved, and popularization of industrial application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a low-temperature degradation dioxin VO x -MoO x / TiO 2 Catalyst preparation and application methods. Background technique [0002] Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD / Fs) are highly toxic persistent organic pollutants that are usually produced during general combustion, metallurgical-related reactions, and municipal waste incineration. Due to its strong toxicity, the discharge of PCDD / Fs in the environment must be strictly controlled. Catalytic degradation technology can completely destroy dioxins and is the most promising flue gas end control technology. [0003] Current research shows that catalysts can be divided into two categories according to their active components: noble metal catalysts and transition metal oxide catalysts. Noble metal catalysts are supported by Pd, Pt, etc. on Al 2 o 3 、TiO 2 On adsorption materials s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01D53/86B01D53/70B01D53/72
CPCB01J23/002B01J23/28B01D53/8662B01D53/8668B01J2523/00B01J2523/47B01J2523/55B01J2523/68
Inventor 陈彤孔德宝刘家巍王容李晓东林晓青
Owner ZHEJIANG UNIV
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