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Denitrition catalyst with mercury removal effect and its preparation method

A denitration catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of blocking air preheaters, corroding downstream equipment, increasing cleaning frequency, etc., to reduce corrosion, reduce Treatment cost, effect of improving denitrification performance

Active Publication Date: 2012-03-07
GUODIAN SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, ozone has a strong oxidizing property, which can remove SO 2 Oxidation to SO 3 , because SO 3 It is difficult to be removed in the wet desulfurization process, which will corrode downstream equipment and cause serious blue smoke pollution
In the flue gas denitrification process, due to SO 3 with reducing agent NH 3 Form ammonium sulfate salt, which is viscous below 300°C, which will block the air preheater and increase its cleaning frequency

Method used

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  • Denitrition catalyst with mercury removal effect and its preparation method
  • Denitrition catalyst with mercury removal effect and its preparation method
  • Denitrition catalyst with mercury removal effect and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 Preparation of catalyst of the present invention

[0034] The preparation method is as follows:

[0035] (1) Add 1.75 times the weight of deionized water to titanium dioxide, mix evenly, heat at 60°C for 24 hours, dry at 80-100°C for 8 hours, and then heat at 120°C for 72 hours, after grinding and sieving, take 60-100 mesh particles to obtain the pre- Activated titanium dioxide.

[0036] (2) Weigh ammonium vanadate with a vanadium content of 1.5 parts by weight, and ammonium tungstate with a tungsten content of 8.5 parts by weight, mix the two, dissolve them in deionized water, and add the pre-activated The carrier titanium dioxide is 65-90 parts by weight, heated and stirred at 60-80°C, so that it is impregnated in the TiO 2 Surface, until the water evaporates, put it in an oven and dry it at 100-110°C for 8 hours.

[0037] (3) Heat up to 400-500°C at a rate of 10-30°C / min, take it out after 5 hours of calcination, cool and grind to obtain SCR catalyst ...

Embodiment 2

[0040] Embodiment 2 Preparation of catalyst of the present invention

[0041] Follow these steps:

[0042] (1) Titanium dioxide activation steps are the same as in Example 1

[0043] (2) Weigh ammonium vanadate containing 1.25 parts by weight of vanadium element and ammonium molybdate of 7.5 parts by weight molybdenum element, mix the two, dissolve with deionized water, add 65-90 parts by weight of pre-activated carrier titanium dioxide, 60-90 parts by weight Heat and stir at 80°C to impregnate TiO 2 Surface, until the water evaporates, put it in an oven and dry it at 100-110°C for 12 hours.

[0044] (3) Heat up to 400-500°C at a rate of 10-30°C / min, take it out after roasting for 5 hours, cool and grind to obtain SCR denitrification catalyst 1.25V 2 o 5 -7.5MoO 3 / TiO 2 , Pressed into 20 ~ 40 mesh particles.

[0045] (4) Weigh cobaltous chloride CoCl containing 7 parts by weight of cobalt element 2 ·6H 2 O, dissolve with appropriate amount of deionization, add SCR ca...

Embodiment 3

[0047] The preparation of embodiment 3 catalysts of the present invention

[0048] (1) Purchase the SCR denitrification catalyst V for coal-fired power plants customized according to the following weight ratio from the supplier 2 o 5 -WO 3 / TiO 2 : 1.5 parts by weight of element V, 8.5 parts by weight of element W, TiO 2 It is 65~90 parts by weight, then through the following steps:

[0049] (2) Weigh cuprous chloride CuCl containing 5 parts by weight of Cu element 2 2H 2 O was dissolved in an appropriate amount of deionized water, added to a commercial SCR denitrification catalyst, fully mixed and impregnated at room temperature until the water evaporated.

[0050] (3) will be impregnated with CuCl 2 The commercial SCR denitration catalyst was moved into a drying oven and dried at 50°C for 24h.

[0051] (4) will be impregnated with CuCl 2 The dried commercial SCR catalyst is placed in a tube furnace, protected by nitrogen, and roasted at 300-350°C for 3 hours at a he...

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Abstract

The invention relates to denitrition catalyst with a mercury removal effect. The catalyst has a chemical general formula of: MXn-V2O5-Y / TiO2, wherein, M is a metallic element selected from Fe, Cu, Mn or Co, X is halogen Cl or Br, Y is WO3 or MoO3, and n=2-4, and the elements are in a weight ratio of: 1-10 of M, 1-1.5 of V, 7.5-8.5 of W or Mo, and 75-100 of TiO2. The catalyst is prepared by the steps of: dipping V2O5-WO3 / TiO2 or V2O5-MoO3 / TiO2 with MCln or MBrn, then conducting frying and calcination. With the catalyst of the invention, catalytic reduction of NOx and catalytic oxidation of Hg<0> can be simultaneously completed in an original flue gas denitrition catalytic reactor, and the generated divalent mercury ions are washed and cured in desulfurized gypsum in a subsequent flue gas wet desulphurization process. Thus, cooperative control of the discharge of NOx and Hg<0> can be realized without increasing flue gas purification facilities of coal-fired power plants.

Description

technical field [0001] The invention relates to a denitrification catalyst which also demercurizes and a preparation method thereof. The catalyst simultaneously has NO x Selective catalytic reduction and catalytic oxidation of zero-valent mercury are mainly used for flue gas purification in coal-fired power plants, including nitrogen oxide and mercury emission control. Background technique [0002] Mercury is the only liquid metal at room temperature. It belongs to "carcinogenic, teratogenic and mutagenic" substances. The dry and wet deposition methods enter the soil and surface water, accumulate in the organism, and endanger human health and the ecological environment. 20% to 40% of the mercury in nature comes from natural releases, 60% to 80% comes from human activities, and the mercury emitted by coal combustion flue gas accounts for 30% to 40% of the mercury emitted by human activities. In the normal combustion temperature range, almost all mercury in coal is zero-vale...

Claims

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Application Information

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IPC IPC(8): B01J27/138B01J27/135B01D53/86B01D53/56B01D53/64
Inventor 吴碧君李永生刘建民肖建平曹锋
Owner GUODIAN SCI & TECH RES INST
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