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Composite catalyst capable of depriving nitre and mercury simultaneously and preparation method thereof

A composite catalyst and catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low catalyst activity temperature window, expensive catalyst cost, high catalytic activity, etc., to achieve wide selectivity, Simple preparation method, high activity effect

Inactive Publication Date: 2012-10-10
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing patents, (CN102218266) is based on TiO 2 As the support body, with V 2 o 5 The catalyst is an active component with high catalytic activity, but the disadvantage is that the catalyst is expensive and toxic
(CN102294248) is based on TiO 2 as carrier, with MnO 2 -Fe 2 o 3 The catalyst is an active component with high catalytic activity, but the catalyst's activity temperature window is not high, which limits its application in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Raw material calculation:

[0026] Weigh the mass of the carrier, measure the water absorption rate of the carrier, and calculate the amount of the active component precursor based on the fact that the mass of the catalytic active group is 8% of the mass of the carrier.

[0027] Specific steps:

[0028] (1) impregnate the honeycomb ceramic carrier into HNO with a mass percentage of 5% 3 solution, heated on a resistance furnace and continued to boil for 5 minutes, washed with distilled water to pH = 5 after natural cooling, and dried in an oven at 60°C for 24 hours before use;

[0029] (2) Take the catalyst active component precursor: cerium nitrate and zirconium oxychloride, wherein the molar ratio of Ce / Zr element is 1:1, dissolve in deionized water whose volume is equal to the total pore volume of the carrier, stir with a magnetic stirrer 2min to make it dissolve completely;

[0030] (3) Immerse the carrier obtained in step (1) in the active component precursor...

example 2

[0033] Raw material calculation:

[0034] Weigh the mass of the carrier, measure the total pore volume of the carrier, and calculate the addition amount of the active component precursor and the auxiliary agent precursor according to the mass of the catalytic active group being 8% of the mass of the carrier and the mass of the auxiliary agent being 2% of the mass of the carrier .

[0035] Specific steps:

[0036] (1) impregnate the honeycomb ceramic carrier into HNO with a mass percentage of 5% 3 solution, heated on a resistance furnace and continued to boil for 8 minutes, washed with distilled water to pH = 5 after natural cooling, and dried in an oven at 70°C for 30 hours before use;

[0037] (2) Take the catalyst active component precursor: cerium acetate and zirconium chloride, wherein the molar ratio of Ce / Zr elements is 1:0.5, the precursor of the auxiliary agent: ammonium metatungstate, all dissolved in a volume equal to the total amount of the carrier Pore ​​vol...

example 3

[0041] Raw material calculation:

[0042] Weigh the mass of the carrier, measure the total pore volume of the carrier, and calculate the addition amount of the active component precursor and the auxiliary agent precursor according to the mass of the catalytic active group being 10% of the mass of the carrier and the mass of the auxiliary agent being 2% of the mass of the carrier .

[0043] Specific steps:

[0044] (1) Immerse the molecular sieve carrier into a HCl solution with a mass percentage of 5%, place it on a resistance furnace and heat it for 8 minutes, then wash it with distilled water to pH=5 after natural cooling, and dry it in an oven at 70°C for 30 hours stand-by;

[0045] (2) Take the catalyst active component precursor: cerium chloride and zirconium nitrate, wherein the molar ratio of Ce / Zr elements is 1:0.5, the precursor of the auxiliary agent: copper acetate, all dissolved in a volume equal to the total pore volume of the carrier In deionized water, st...

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Abstract

The invention relates to a composite catalyst capable of depriving nitre and mercury simultaneously and a preparation method thereof, belongs to the technical field of air pollution control, and is used for depriving fire coal smoke nitric oxide and elementary substance mercury. The catalyst comprises an active component and a carrier, the active component is CeO2 and ZrO2, molar ratio of Ce and Zr is 1 / 0.1-1, the carrier is one or a plurality of kinds of honeycomb ceramics, a molecular sieve, a ceramic plate, activated carbon fibers, a silica gel carrier, kieselguhr, metal alloy and a filter bag. Quality of the carrier serves as a standard, and the content of the active component of the catalyst is 5%-30%. The composite catalyst further comprises an assistant which is one of or any combination of two of oxides of W, Cu, Fe, Ti and Ni. Quality of the carrier serves as a standard, and the content of the assistant is 0%-15%.

Description

technical field [0001] The invention relates to a composite catalyst for simultaneous denitrification and mercury removal and a preparation method thereof, which belongs to the technical field of air pollution control and is used for removing nitrogen oxides and elemental mercury from coal-fired flue gas. Background technique [0002] Mercury is a toxic substance with permanent accumulation in organisms and food chains, which may cause serious diseases such as hepatitis, nephritis, and hematuria. Studies have shown that mercury compounds can also enter the fetus through the placenta, thereby seriously affecting the health of the fetus. Mercury has been regarded as a priority pollutant due to its strong volatility, long residence time and significant bioaccumulation effect. my country's coal-fired flue gas is the most important source of mercury emissions. For a long time to come, my country's coal-based energy consumption structure will be difficult to change. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/30B01J29/00B01J23/83B01J23/888B01D53/86B01D53/56B01D53/64
Inventor 沈树宝陈志平祝社民
Owner NANJING UNIV OF TECH
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