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Method for preparing composite catalyst for low temperature degradation of dioxin by ball milling

A technology of composite catalyst and ball milling method, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. It can solve the problem of high reaction temperature, poor stability of preparation process, and difficulty in obtaining low-temperature degradation of dioxins with uniform size. Catalyst and other problems, to achieve the effect of lowering the reaction temperature, good low-temperature catalytic reaction activity, and good thermochemical stability

Active Publication Date: 2022-01-11
浙江京兰低碳技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon nanotube composite catalysts have been used for the degradation of VOCs in the current research, it is difficult to obtain low-temperature degradation catalysts with uniform size and stable combination due to the poor stability of the preparation process and high reaction temperature.

Method used

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  • Method for preparing composite catalyst for low temperature degradation of dioxin by ball milling
  • Method for preparing composite catalyst for low temperature degradation of dioxin by ball milling
  • Method for preparing composite catalyst for low temperature degradation of dioxin by ball milling

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Experimental program
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Effect test

Embodiment 1 2

[0040] The preparation method of embodiment 1 dioxin low-temperature degradation catalyst Cata-1

[0041] Put carbon nanotubes (Jiangsu Xianfeng Nano Material Technology Co., Ltd., model: XFM34, tube diameter > 50nm) in a 1:1 mixture of concentrated sulfuric acid (98%) and concentrated nitric acid (68%) for ultrasonic treatment for 30min, and wash filtering, washing with water until the pH of the filtrate is neutral, and drying to obtain pretreated carbon nanotubes. Mix the precursor according to the ratio of catalyst carbon nanotubes: vanadium pentoxide: titanium dioxide = 5:4:91, the specification of the ball mill tank is 0.5L, and add the corresponding supporting zirconia according to the mass ratio of ball to material ratio of 20:1 Grind the balls for 2 hours under the condition of 400r / min, and then place the powder in a muffle furnace for calcination at 450°C for 4 hours to obtain Cata-1, a low-temperature degradation catalyst for dioxins.

[0042] From figure 1 It can...

Embodiment 2 2

[0043] The preparation method of embodiment 2 dioxin low-temperature degradation catalyst Cata-2

[0044] Carbon nanotubes (Jiangsu Xianfeng Nano Material Technology Co., Ltd., model: XFM34, tube diameter > 50nm) were placed in a 1:1 mixture of concentrated sulfuric acid (98%) and concentrated nitric acid (68%) for ultrasonic treatment for 30 minutes, washing and filtering, washing with water until the pH of the filtrate is neutral, and drying to obtain pretreated carbon nanotubes. Mix the precursor according to the ratio of catalyst carbon nanotubes: vanadium pentoxide: titanium dioxide = 10:4:86, the specification of the ball mill tank is 0.5L, and add the corresponding matching zirconia according to the mass ratio of ball to material ratio of 20:1 Grind the balls for 2 hours under the condition of 400r / min, and then place the powder in a muffle furnace for calcination at 450°C for 4 hours to obtain Cata-2, a low-temperature degradation catalyst for dioxins.

Embodiment 3 2

[0045] The preparation method of embodiment 3 dioxin low-temperature degradation catalyst Cata-3

[0046] Carbon nanotubes (Jiangsu Xianfeng Nano Material Technology Co., Ltd., model: XFM34, tube diameter > 50nm) were placed in a 1:1 mixture of concentrated sulfuric acid (98%) and concentrated nitric acid (68%) for ultrasonic treatment for 30 minutes, washing and filtering, washing with water until the pH of the filtrate is neutral, and drying to obtain pretreated carbon nanotubes. Mix the precursor according to the ratio of catalyst carbon nanotubes: vanadium pentoxide: titanium dioxide: tungsten trioxide = 10:4:72:14, the specification of the ball mill tank is 0.5L, and add according to the mass ratio of ball to material ratio of 20:1 The matching zirconia balls were ground for 2 hours under the condition of 400r / min, and then the powder was calcined in a muffle furnace at 450°C for 4 hours to obtain Cata-3, a low-temperature degradation catalyst for dioxins.

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Abstract

The invention discloses a method for preparing a dioxin low-temperature degradation composite catalyst by a ball milling method, belonging to the technical field of catalyst preparation. In the present invention, carbon nanotubes are used as a carrier, and carbon nanotubes are pretreated in a strong acid environment to generate functional groups such as hydroxyl groups and carboxyl groups on the surface, transition metal oxides are used as catalytic components, and transition metal oxides are uniformly loaded on carbon by ball milling. On the surface of nanotubes, large-scale synthesis of carbon nanotube composite catalysts with high dispersion and stable structure was realized at room temperature by adjusting the parameters of ball milling process and ball-to-material ratio. The preparation method of the invention has mild conditions, is environmentally friendly and pollution-free, and has a short preparation period. Compared with the traditional honeycomb titanium dioxide catalyst, the carbon nanotube composite catalyst prepared by the method of the invention has good thermochemical stability, the catalyst is not easily deactivated in the reaction process, and has good low-temperature catalytic reaction activity.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for preparing a dioxin low-temperature degradation composite catalyst by a ball milling method. Background technique [0002] Mechanochemical method is a typical harmless treatment process, and its research has developed rapidly in recent years. Through the action of mechanical force, the mechanical energy is transferred to the substance. When the substance accepts the action of mechanical force, physical and chemical reactions occur, the chemical properties and structure change, and its reactivity is improved, thereby stimulating and accelerating the chemical reaction produced. This method consumes less energy, produces no harmful by-products in the process, and is environmentally friendly. [0003] Carbon nanotube is a material with excellent physical and chemical properties. Its unique adsorption characteristics, excellent electron mobility a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J23/30B01J35/10B01J37/00B01J37/08B01D53/86B01D53/72
CPCB01J23/22B01J23/30B01J23/002B01J35/1061B01J37/0036B01J37/08B01D53/8668B01D2257/70B01J2523/00B01J2523/47B01J2523/55B01J2523/69
Inventor 彭亚旗陆胜勇李晓东顾雨梦汤明慧严建华
Owner 浙江京兰低碳技术有限公司
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