A kind of modified catalyst for gaseous elemental mercury oxidation and preparation method thereof

A catalyst and elemental mercury technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of catalytic oxidation rate less than 15%, expensive, difficult to apply, etc., to achieve sustainable development, Long-lasting, low-cost effects

Active Publication Date: 2015-10-21
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional SCR catalysts are sensitive to Hg 0 The catalytic oxidation rate is generally less than 15%
Noble metal catalysts such as gold and palladium promote Hg at lower temperatures 0 catalytic oxidation, but it is too expensive to be applied in industry

Method used

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  • A kind of modified catalyst for gaseous elemental mercury oxidation and preparation method thereof
  • A kind of modified catalyst for gaseous elemental mercury oxidation and preparation method thereof
  • A kind of modified catalyst for gaseous elemental mercury oxidation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Anhydrous MnCl 2 Add in deionized water, stir evenly, and prepare different MnCl 2 Mass fraction of impregnation solution (MnCl 2 The solubility in water is shown in Table 1), and then the dried γ-Al 2 o 3 The pellets were respectively immersed in the above solution, stirred slightly and dipped for 6 h, dried at 80 °C for 8 h, heated at 200 °C for 2 h under nitrogen purging, and then heated at 380 °C for 3 h under nitrogen purging to prepare Catalyst MnCl with different content of catalytic components 2 / γ-Al 2 o 3 . Different MnCl 2 The mass fraction of each catalyst prepared by impregnating solution vs. Hg 0 The catalytic oxidation efficiency is shown in Table 2.

[0029] Table 1 MnCl 2 Solubility in water

[0030]

[0031] Table 2 Catalytic oxidation efficiency of catalyst

[0032]

Embodiment 2

[0033] Example 2 with anhydrous MnCl 2 As a catalytic component, (NH 4 ) 6 Mo 7 o 24 4H 2 O is used as a doping modification component, and (NH 4 ) 6 Mo 7 o 24 4H 2 O and MnCl 2 Mix according to different molar ratios, add deionized water and stir evenly to obtain MnCl-containing 2 The impregnation solution with a mass fraction of 15%, and then the dried γ-Al 2 o 3 The carrier pellets were respectively immersed in the above solution, stirred slightly and immersed for 6 h, dried at 80 °C for 8 h, heated at 200 °C for 2 h under nitrogen purging, and heated at 380 °C for 3 h under nitrogen purging. Catalyst MoO with different content of doped modification components and catalytic components prepared 3 -MnCl 2 / γ-Al 2 o 3 . (NH 4 ) 6 Mo 7 o 24 4H 2 O and MnCl 2 The effect of each catalyst on Hg prepared by impregnating solution mixed in different molar ratios 0 The catalytic oxidation efficiency is shown in Table 3.

[0034] Table 3 Catalytic oxidation eff...

Embodiment 3

[0036] Example 3 (NH 4 ) 6 Mo 7 o 24 4H 2 O and MnCl 2 Mix at 0.5% by mole ratio, add deionized water and stir evenly to obtain 2 and (NH 4 ) 6 Mo 7 o 24 The soaking liquid of mass fraction, all the other are identical with embodiment 2. Different MnCl 2 and (NH 4 ) 6 Mo 7 o 24 The mass fraction of each catalyst prepared by impregnating solution vs. Hg 0 The catalytic oxidation efficiency is shown in Table 4.

[0037] Table 4 Catalytic oxidation efficiency of modified catalysts

[0038]

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Abstract

The invention provides a modified catalyst for gaseous-state elemental mercury oxidation and a preparation method of the modified catalyst, belonging to the technical field of mercury removal from smoke. The catalyst is the modified catalyst formed by loading a catalysis component manganese chloride, and a doping modification component ammonium molybdate on a catalytic carrier, wherein the total load of molybdenum, manganese and chlorine is 1.25-25 wt%, and the molar ratio of the three elements is (0.007-0.14): 1: 2. Experimental results indicate that via the preparation method, the three elements molybdenum, manganese and chlorine can be uniformly dispersed on the catalytic carrier to inhibit the grain agglomeration of the catalyst during the preparation process and form a more stable aggregate, thus effectively increasing the efficiency of oxidation for gaseous-state HgO; and the catalyst is very strong in catalytic oxidation performance and sulphur-resistant performance for the gaseous-state HgO in a temperature ranging from 100 to 200 DEG C, and long in endurance time; and the catalytic oxidation efficiency of converting the gaseous-state HgO to Hg<2+> is greater than 97%.

Description

technical field [0001] The invention relates to a modified catalyst for the oxidation of gaseous elemental mercury and a preparation method thereof, in particular to a gaseous elemental mercury (Hg 0 ) Modified catalyst for oxidation and its preparation method. It belongs to the technical field of mercury removal from flue gas. Background technique [0002] In February 2011, my country's "Twelfth Five-Year Plan for Comprehensive Prevention and Control of Heavy Metal Pollution" clearly classified mercury as the first type of heavy metal pollutants for key prevention and control. %; Mercury emissions from non-key areas shall not exceed the level in 2007. The "Plan" involves mercury pollution prevention and control technical standards, policy measures and management regulations, formulates a list of "high pollution and high environmental risk" products involving mercury, comprehensively investigates and rectifies mercury polluting enterprises, optimizes the structure of mercur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/138B01D53/86B01D53/64
Inventor 杨勇栾景丽何艳明刘维维欧根能陶辉旺陈华君熊国焕张水南姜永利
Owner KUNMING METALLURGY INST
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