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Preparation method of compound SCR catalyst with zero-valent mercury conversion function

A technology of SCR catalyst and zero-valent mercury, which is applied in the field of preparation of composite SCR catalyst, can solve the problems of low oxidation efficiency, affecting catalytic oxidation, and poor catalytic conversion effect, etc.

Active Publication Date: 2011-02-16
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Hg 0 To Hg 2+ The efficient conversion of mercury is the key and difficult point of efficient mercury removal. At present, researchers have not yet obtained a mature and efficient conversion method
It has been confirmed that selective catalytic reduction (Selective catalytic reduction, SCR) catalyst can promote HCl in flue gas to Hg 0 However, when the HCl concentration in the flue gas is low, the oxidation efficiency is not high, and the research also shows that the ammonia gas added to the denitrification has a certain inhibitory effect on the oxidation of zero-valent mercury, and the sulfur dioxide in the flue gas will also affect the SCR. Catalytic Oxidation of Zero-valent Mercury
[0005] After searching the prior art, it is found that some conventional SCR catalysts have poor catalytic conversion effect on zero-valent mercury (Kim, Appl. Catal. B. Environ. 2010, 99, 272-278), and zero-valent mercury under the action of 50ppmHCl The removal efficiency can reach 90%
However, the concentration of HCl in the usual flue gas is difficult to meet such a high requirement
The present invention aims at the problem that the current SCR modified catalyst has low catalytic oxidation efficiency of zero-valent mercury at a lower HCl concentration, and develops a catalyst with higher zero-valent mercury removal efficiency and nitrogen oxides at different temperatures and lower concentrations of HCl. Removal Efficiency of SCR Modified Catalysts

Method used

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  • Preparation method of compound SCR catalyst with zero-valent mercury conversion function
  • Preparation method of compound SCR catalyst with zero-valent mercury conversion function

Examples

Experimental program
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Effect test

Embodiment 1

[0021] with TiO 2 The SCR catalyst is used as the carrier, and the SCR and Ru / SCR composite catalyst are prepared by impregnation method.

[0022] A. Conventional SCR catalyst preparation impregnation solution composition: 0.3g ammonium metavanadate, 1.8g ammonium tungstate plus deionized water diluted to 20ml, then add 0.5g polyacrylamide as binder;

[0023] B. Composition of impregnating solution prepared by conventional SCR catalyst: 0.3g ammonium metavanadate, 1.8g ammonium paramolybdate, dilute to 20ml with deionized water, then add 0.5g polyacrylamide as binder;

[0024] C, ruthenium-doped SCR composite catalyst preparation impregnation solution composition: 0.2g ruthenium chloride, 0.3g ammonium metavanadate, 1.8g ammonium tungstate plus deionized water diluted to 20ml, then add 0.5g polyacrylamide as a binder;

[0025] Using powdered TiO 2 As a catalyst carrier, weigh 3 parts, 30g each; pour them into the above three solutions for immersion and stir, pour out the exc...

Embodiment 2

[0030] with TiO 2 The SCR catalyst is used as the carrier, and the ruthenium-doped modified molybdenum-containing SCR composite catalyst is prepared by impregnation method.

[0031]Preparation of impregnation solution with ruthenium-doped SCR composite catalyst composition: 0.2g ruthenium chloride, 0.3g ammonium metavanadate, 1.8g ammonium paramolybdate, add deionized water to dilute to 20ml, then add 0.5g polyacrylamide as binder;

[0032] Weigh 30g powdered TiO 2 As a catalyst carrier, pour it into the above-mentioned precursor solution for impregnation and stir, pour out the excess impregnation solution after soaking for 1 hour, and dry the impregnated powder in an oven at 60-70°C, and then Pour them into the remaining impregnating solution respectively, and stir well, so that the impregnating solution is completely covered with TiO 2 Carrier blotted dry.

[0033] The impregnated SCR is then dried at a temperature of 60-80°C for 4-6 hours, then transferred to a muffle fu...

Embodiment 3

[0037] Based on the finished commercial V / W / Ti type SCR catalyst, it is ground into 40-60 mesh particles, and then modified by ruthenium doping, and the Ru / SCR catalyst is prepared by impregnation method.

[0038] Prepare impregnation solution: A: 0.2g ruthenium chloride and deionized water to dilute to 20ml; B: 0.2g ruthenium chloride, 0.5g ammonium paramolybdate and deionized water to dilute to 20ml.

[0039] Using powdered SCR as the catalyst carrier, weigh 2 parts, 30g each; pour them into the above two solutions for immersion and stir, pour out the excess immersion solution after immersion for 1 hour, and pour out the SCR after immersion once. The powder is dried in an oven at 60-70°C, and then poured into the remaining impregnating solution respectively, and fully stirred, so that the impregnating solution is completely absorbed by the SCR carrier.

[0040] The impregnated SCR is then dried at a temperature of 60-80°C for 4-6 hours, then transferred to a muffle furnace a...

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Abstract

A preparation method of a compound SCR catalyst with zero-valent mercury conversion function belongs to the technical field of environmental protection, comprising the following steps: adding a ruthenium precursor and a basic denitrating catalytic component precursor to deionized water in sequence and stirring the mixture uniformly to obtain dipping solution, then mixing a catalyst carrier with the dipping solution and drying the mixture and finally roasting the dried catalyst carrier in a muffle furnace to obtain the compound SCR catalyst. The catalyst prepared by the invention can effectively convert the zero-valent mercury in the flue gas into the divalent mercury which is easy to remove while reducing and converting the nitric oxides, thus forming the divalent mercury which is convenient to catch and realizing double effects of simultaneously denitrating the coal-fired flue gas and oxidizing the zero-valent mercury.

Description

technical field [0001] The invention relates to a method for preparing a catalyst in the technical field of environmental protection, in particular to a method for preparing a composite SCR catalyst with zero-valent mercury conversion. Background technique [0002] Mercury is known to be a toxic pollutant. It not only causes direct or indirect harm to human health, but also has great harm to the environment due to its characteristics of bioaccumulation and non-degradability. Coal combustion flue gas is one of the main anthropogenic factors causing atmospheric mercury pollution. my country consumes a large amount of coal and contains high mercury content, so the problem of mercury pollution is relatively serious, and the pressure from the international community is also increasing. Therefore, it is very important to strengthen the control of flue gas mercury emissions. [0003] Mercury in coal-fired flue gas is mainly in the form of particulate mercury (Hg P ), gaseous div...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/90B01J23/64B01J23/652B01D53/64B01J23/46
Inventor 晏乃强瞿赞陈杰陈万苗郭永福
Owner SHANGHAI JIAO TONG UNIV
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