pd‑cucl 2 /γ‑al 2 o 3 Preparation method and application of mercury removal composite catalyst

A composite catalyst, pd-cucl2 technology, applied in chemical instruments and methods, separation methods, dispersed particle separation and other directions, can solve the problems of poor sulfur resistance, smelting flue gas mercury removal process, etc., achieve excellent sulfur resistance, preparation technology Simple, adaptable effects

Active Publication Date: 2017-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the mercury removal catalyst in the prior art is difficult to apply to the mercury removal process of smelting flue gas due to its poor sulfur resistance performance, the purpose of the present invention is to provide a mercury removal catalyst that has good mercury removal performance, no secondary pollution, and can withstand high sulfur dioxide concentration The preparation method of the composite catalyst of the environment, the method is simple to operate, environmentally friendly, and meets the requirements of industrial production

Method used

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  • pd‑cucl <sub>2</sub> /γ‑al <sub>2</sub> o <sub>3</sub> Preparation method and application of mercury removal composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 0.6696g copper chloride CuCl 2 2H 2 O and 0.0957g dichlorotetramine palladium Pd (NH 3 ) 4 Cl 2 , respectively dissolved in 25mL of deionized water to make an impregnation solution; using γ-Al with a diameter of 1.5-2mm 2 o 3 The ball is used as the catalyst carrier, and the equal volume impregnation method is used to weigh 2g of γ-Al 2 o 3 Immerse in 3mL of the above palladium-containing impregnation solution; immerse in ultrasonic for 10min, air-dry for 6h and then dry at 60°C for 2h; then take 2.3mL of the above-mentioned cupric chloride solution and impregnate it into the above catalyst, immerse in ultrasonic for 10min, air-dry for 6h and then dry at 60°C After drying for 2 hours, the obtained catalyst was activated in an air atmosphere at a temperature of 200-400°C for 6 hours (1h at 200°C, 1h at 300°C, 4h at 400°C), and the catalyst Pd(0.4%)-CuCl 2 (3.1%) / γ-Al 2 o 3 (baking).

Embodiment 2

[0036] Take 2.1739g copper chloride CuCl 2 2H 2 O and 0.3107g dichlorotetramine palladium Pd (NH 3 ) 4 Cl 2 , respectively dissolved in 25mL of deionized water to make an impregnation solution; using γ-Al with a diameter of 1.5-2mm 2 o 3 The ball is used as the catalyst carrier, and the equal volume impregnation method is used to weigh 2g of γ-Al 2 o 3 Immerse in 3mL of the above palladium-containing impregnation solution; immerse in ultrasonic for 10min, air-dry for 6h and then dry at 60°C for 2h; then take 2.3mL of the above-mentioned cupric chloride solution and impregnate it into the above catalyst, immerse in ultrasonic for 10min, air-dry for 6h and then dry at 60°C After drying for 2 hours, the obtained catalyst was activated in an air atmosphere at a temperature of 200-400°C for 6 hours (1h at 200°C, 1h at 300°C, 4h at 400°C), and the catalyst Pd(1.4%)-CuCl 2 (10%) / γ-Al 2 o 3 (baking).

Embodiment 3

[0038] Take 0.6696g copper chloride CuCl 2 2H 2 O and 0.00479g dichlorotetramine palladium Pd (NH 3 ) 4 Cl 2 , respectively dissolved in 25mL of deionized water to make an impregnation solution; using γ-Al with a diameter of 1.5-2mm 2 o 3 The ball is used as the catalyst carrier, and the equal volume impregnation method is used to weigh 2g of γ-Al 2 o 3 Immerse in 3mL of the above palladium-containing impregnation solution; immerse in ultrasonic for 10min, air-dry for 6h and then dry at 60°C for 2h; then take 2.3mL of the above-mentioned cupric chloride solution and impregnate it into the above catalyst, immerse in ultrasonic for 10min, air-dry for 6h and then dry at 60°C After drying for 2 hours, the obtained catalyst was activated in an air atmosphere at a temperature of 200-400°C for 6 hours (1h at 200°C, 1h at 300°C, 4h at 400°C), and the catalyst Pd(0.2%)-CuCl 2 (3.1%) / γ-Al 2 o 3 (baking).

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Abstract

The present invention discloses a preparation method for a Pd-CuCl2 / gamma-Al2O3 demercurating composite catalyst and an application thereof. The preparation method for the composite catalyst comprises: after dichlonetetramine palladium and copper chloride are loaded on a gamma-Al2O3 carrier by an impregnation method, the carrier is activated at a high temperature, and the composite catalyst is obtained; The method provided by the present invention is simple in process and environmental-friendly; the prepared composite catalyst can be applied to catalytic oxidation of elemental mercury; high efficient conversion of zero-valent mercury is realized under the condition of high sulfur (SO2 contained is greater than or equal to 2000 ppm); and the conversion rate can reach 90%. The composite catalyst has a good performance of tolerating sulfur dioxide, and is not easy to poison.

Description

technical field [0001] The present invention relates to a kind of Pd-CuCl 2 / γ-Al 2 o 3 The preparation method of the mercury removal composite catalyst and the application of the composite catalyst in the process of catalyzing and oxidizing elemental mercury to generate divalent mercury belong to the field of mercury pollution emission control. Background technique [0002] Atmospheric mercury has attracted widespread attention due to its characteristics of persistence, bioaccumulation, neurotoxicity, and long-distance transport. Based on the hazards of atmospheric mercury pollution, the control of atmospheric mercury pollution was included in international agreements as early as the 1990s. Since 2002, the biennial United Nations intergovernmental meeting "Global Environment Ministers Forum" has taken the issue of global mercury pollution as the main topic. However, although my country is a large non-ferrous metal smelting country, the research on mercury pollution prev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/13B01D53/86B01D53/64
Inventor 刘恢杨姝柴立元刘操杨本涛刘志楼王东丽闵小波杨志辉
Owner CENT SOUTH UNIV
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