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Honeycomb vanadium series denitration preformed catalyst, and preparation method and use thereof

A catalyst, honeycomb-shaped technology, applied in the field of environmental catalysis and environmental protection, can solve the problems of water resistance, sulfur resistance, poor corrosion resistance, and high vanadium loading of the unexamined catalyst, and achieve excellent resistance to SO2 and water vapor poisoning performance, The effect of excellent denitration efficiency and excellent mechanical properties

Active Publication Date: 2016-05-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst uses 80-99% TiO 2 and 1-20% silicon-aluminum oxide as a carrier, extruded into a honeycomb body, and then coated with active ingredient V on the surface of the honeycomb body by impregnation 2 o 5 and WO 3 , due to the surface coating, the vanadium load is high and the corrosion resistance is poor
[0006] CN1778466A discloses that the nano-titanium dioxide powder is made into a solid slurry by adding a binder, extruded, dried and calcined to obtain a titanium dioxide molded product with a certain strength and a certain shape, but the titanium dioxide molded product is mainly used as a catalyst carrier, and it does not Catalytically active, therefore also does not take into account the possible detrimental effects of binders on catalytic activity in the application of specific catalytically active substances
However, the catalyst did not examine the water resistance and sulfur resistance of the catalyst, the stability is not very good, and it is only suitable for the environmental conditions of coal-fired boilers

Method used

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  • Honeycomb vanadium series denitration preformed catalyst, and preparation method and use thereof
  • Honeycomb vanadium series denitration preformed catalyst, and preparation method and use thereof
  • Honeycomb vanadium series denitration preformed catalyst, and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Configuration 5wt% oxalic acid solution, then add ammonium metavanadate, active component V 2 o 5 The content accounts for 0.1% of the mass percentage of the catalyst powder, stir and dissolve at a temperature of 55°C until the solution turns dark blue, then add ammonium metatungstate, WO 3 The content accounts for 10% of the mass percentage of the catalyst powder and is stirred until dissolved. Then add this solution into the titanium dioxide powder and stir evenly to obtain a slurry. Dry at 110° C. for 12 hours, grind, calcinate at 500° C. for 5 hours, and grind to obtain catalyst powder.

[0054] Weigh the catalyst powder, then add solid forming aids glass fiber, activated carbon, and methyl cellulose for stirring and dry mixing, wherein the content of glass fiber is 10%, the content of activated carbon is 10%, and the content of methyl cellulose is 1%. After uniformity, add liquid forming additives silica sol and glycerin for wet mixing, wherein the content of si...

Embodiment 2

[0057] Configuration 5wt% oxalic acid solution, then add ammonium metavanadate, active component V 2 o 5 The content accounts for 3% of the mass percentage of the catalyst powder, stir and dissolve at a temperature of 55°C until the solution turns dark blue, then add ammonium metatungstate, WO 3 The content accounts for 1% of the mass percentage of the catalyst powder, and it is stirred until dissolved. Then add this solution into the titanium dioxide powder and stir evenly to obtain a slurry. Dry at 110° C. for 12 hours, grind, calcinate at 500° C. for 5 hours, and grind to obtain catalyst powder.

[0058] Weigh the catalyst powder, then add solid forming aids glass fiber, safflower powder, and polyvinyl alcohol for stirring and dry mixing, wherein the content of glass fiber is 10%, the content of squat powder is 5%, and the content of polyvinyl alcohol is 1%. After mixing evenly, add liquid forming additives silica sol and glycerin for wet mixing, wherein the content of s...

Embodiment 3

[0061] Configuration 5wt% oxalic acid solution, then add ammonium metavanadate, active component V 2 o 5 The content accounts for 1.5% of the mass percentage of the catalyst powder. Stir and dissolve at a temperature of 55°C until the solution turns dark blue, then add ammonium metatungstate, WO 3 The content accounts for 10% of the mass percentage of the catalyst powder and is stirred until dissolved. Then add this solution into the titanium dioxide powder and stir evenly to obtain a slurry. Dry at 110° C. for 12 hours, grind, calcinate at 500° C. for 5 hours, and grind to obtain catalyst powder.

[0062] Weigh the catalyst powder, then add solid forming aids glass fiber, water glass, activated carbon, hydroxypropyl methylcellulose, and turnip powder for stirring and dry mixing, wherein the content of glass fiber is 10%, and the content of activated carbon is 5%. The content of safflower powder is 5%, the content of hydroxypropyl methylcellulose is 5%, and after mixing eve...

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Abstract

The invention relates to a high-water resistance and high-sulfur resistance honeycomb vanadium series denitration preformed catalyst suitable for FCC flue gas, and a preparation method and a use thereof, and belongs to the technical fields of environment catalysis and environment protection. The preparation method comprises the following steps: preparing catalyst powder through adopting a volume immersion technology with anatase titanium dioxide as a carrier, V2O5 as an active component and WO3 as an active assistant, and adding a forming assistant to prepare the honeycomb preformed catalyst with wide active temperature window, strong water resistance and strong sulfur resistance. The forming assistant mainly comprises a reinforcing agent, an inorganic binder, an organic binder, a pore forming agent and a lubricant. Pilot plant test of the preformed catalyst in a small FCC apparatus shows that the denitration efficiency of the catalyst under an air speed of 4000h<-1>, an NO concentration of 1000ppm, an SO2 concentration of 1500ppm and an H2O content of 5% is 85% or above at 250-450DEG C and reaches 90% or above at 300-450DEG C.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis and environmental protection, and in particular relates to a honeycomb vanadium-based denitrification molding catalyst, a preparation method and its application, in particular to a honeycomb vanadium-based denitrification suitable for FCC flue gas with high water resistance and sulfur resistance Shaped catalyst, method of preparation and use thereof. Background technique [0002] Nitrogen oxides are common pollutants discharged into the atmosphere by human activities, of which the largest proportion is NO and NO 2 . High concentrations of NO in the atmosphere x It has a strong stimulating effect on the human respiratory system. In addition, NO has a strong affinity with hemoglobin in the blood, thereby reducing the oxygen transport capacity of the blood. NO can also be converted to NO by photochemical oxidation 2 , and then form nitric acid and nitrous acid, which are the main ...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J35/04B01D53/86B01D53/56
Inventor 张鑫陈志坤吕一品高金森徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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