Composite smoke denitration catalyst capable of oxidizing zero-valence mercury

A denitrification catalyst and composite technology, which is applied in the field of composite flue gas denitrification catalyst and its preparation, can solve the problems of catalytic oxidation efficiency reduction, activity impact, investment increase, etc.

Active Publication Date: 2012-02-15
GUODIAN SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Neither activated carbon nor halide oxidizers are recyclable and therefore expensive
[0006] The Chinese patent with the publication number CN1698931 discloses a method for removing mercury from flue gas by catalytic oxidation, which uses transition metal oxides such as Fe, Co, Ni, Cu, and Mn to catalyze the oxidation of mercur

Method used

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  • Composite smoke denitration catalyst capable of oxidizing zero-valence mercury
  • Composite smoke denitration catalyst capable of oxidizing zero-valence mercury
  • Composite smoke denitration catalyst capable of oxidizing zero-valence mercury

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 Preparation of composite flue gas denitrification catalyst capable of oxidizing zero-valent mercury

[0031] The preparation method comprises the following steps:

[0032] (1) Titanium dioxide is mixed with 1.75 times the weight of deionized water, heated at 60°C for 24 hours, dried at 80-100°C for 8 hours, then heated at 120°C for 72 hours, ground and sieved to obtain 60-100 mesh pre-activated titanium dioxide particles.

[0033] (2) Weigh cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O), dissolved in deionized water, adding 75-100g of pre-activated carrier titanium dioxide, adding ammonium carbonate aqueous solution while stirring until Ce(OH) 3 The precipitates were all precipitated and deposited on the carrier TiO 2 on, filtered and washed to obtain Ce(OH) 3 / TiO 2 .

[0034] (3) Weigh ammonium vanadate with a vanadium content of 1.5g and ammonium tungstate with a tungsten content of 8.5g, mix them, dissolve them in deionized water, and mix with t...

Embodiment 2

[0037] Example 2 Preparation of composite flue gas denitrification catalyst capable of oxidizing zero-valent mercury

[0038] (1) Titanium dioxide activation steps are the same as in Example 1

[0039] (2) Weigh cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O), stir with deionized water until completely dissolved, add 75-100 g of pre-activated carrier titanium dioxide, add ammonium carbonate aqueous solution while stirring, until Ce(OH) is generated 3 The precipitates were all precipitated and deposited on the carrier TiO 2 on, filtered and washed to obtain Ce(OH) 3 / TiO 2 .

[0040] (3) Weigh ammonium vanadate with a vanadium content of 1.5g and ammonium molybdate with a molybdenum content of 8.25g, mix them, dissolve them in deionized water, and mix with the material obtained in step (2), at 60-80°C Heat and stir to make it impregnated in Ce(OH) 3 / TiO 2 surface until the moisture evaporates and then tumble dry.

[0041] (4) Dry the material obtained in step (3) at 60-1...

Embodiment 3

[0043] Example 3 Preparation of composite flue gas denitrification catalyst capable of oxidizing zero-valent mercury

[0044] The SCR denitrification catalyst V for coal-fired power plants customized according to the following weight ratio was purchased from the supplier 2 o 5 -WO 3 / TiO 2 : 1.25 parts by weight of element V, 8.0 parts by weight of element W, TiO 2 It is 75~100 parts by weight, then through the following steps:

[0045] (1) Weigh cerium nitrate with 3 parts by weight of Ce element; add the commercial SCR catalyst into the cerium nitrate aqueous solution, and heat at 60-80°C until the water evaporates.

[0046] (2) Dry the SCR catalyst impregnated with cerium nitrate at 100-120°C.

[0047] (3) Heat up to 350-450°C at a rate of 8-20°C / min, and bake for 5 hours to obtain the composite SCR catalyst of the present invention: 1.25V 2 o 5 -3CeO 2 -8.0WO 3 / TiO 2 , pressed into 20-40 mesh particles, the catalyst code is C.

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Abstract

The invention provides a composite smoke denitration catalyst capable of oxidizing zero-valence mercury. The catalyst is composite oxide V2O5-CeO2-WO3/TiO2 or V2O5-CeO2-MoO3/TiO2 based on TiO2 as a carrier, wherein the weight proportion is as follows: the weight percent of TiO2 is 75-100, the weight percent of V is 1-1.5, the weight percent of Ce is 1-5, and the weight percent of W or Mo is 7.5-8.5. The preparation method comprises the following steps: depositing Ce(OH)3 on nano TiO2; dipping ammonium vanadate/ammonium molybdate; and drying and roasting so as to obtain the catalyst; or dipping a commercial SCR (selective catalytic reduction) catalyst in a cerous nitrate aqueous solution, and then drying and roasting. The catalyst provided by the invention maintains the denitraiton efficiency of the original SCR catalyst and simultaneously the oxidation rate of zero-valence mercury is obviously improved, and divalent mercury ions are captured in subsequent dedusting equipment and wet desulphurization system; and the application temperature range of the catalyst is wide, the combination control of emission amounts of nitrogen oxides and mercury in smoke of a fuel coal power plant can be achieved on the promise that the smoke purification facility of the fuel coal power plant is not added.

Description

technical field [0001] The invention relates to a composite flue gas denitrification catalyst capable of oxidizing zero-valent mercury and a preparation method thereof. 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 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. my country's coal accounts for a relatively large proportion of primary energy, and th...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/28B01D53/86B01D53/56B01D53/64
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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