A high specific surface area vanadium-zinc modified denitration catalyst and its preparation method

A high specific surface area, denitration catalyst technology, applied in the field of high specific surface area vanadium-zinc modified denitration catalyst and preparation, can solve the problems of poor low temperature activity, narrow operating temperature range, serious pollution, etc., to improve specific surface area and uniformity , the effect of saving production costs

Active Publication Date: 2016-03-16
昌邑凯特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the SCR process, the V-series catalyst is the most widely used commercially, with good activity and stability, but V is a toxic substance, and the subsequent treatment causes serious pollution, and the use temperature range is narrow, and the low-temperature activity is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] [1] Mix 30g of ammonium metatungstate and 17g of zinc nitrate to make 150ml of stable solution.

[0032] [2] Take 500g of metatitanic acid, add 20g of carboxymethylcellulose as a molding aid, 5g of polyacrylamide as an adhesive, 30g of glass fiber as a toughening agent, 15g of glycerin as a humectant, and 10g of flour as a pore-enlarging agent. Then add 150ml of the solution prepared in step [1], knead evenly, extrude after stale for 24 hours, then gradually heat up and dry from 30°C, after 18h, heat up to 90°C, take it out and put it in a muffle furnace for roasting at 580°C 2h, prepared a1.

[0033] [3] Measure the water absorption rate of a1 to be 32.5%.

[0034] [4] Weigh 6.5g of ammonium metavanadate, 17g of zinc nitrate, and 9g of oxalic acid, dissolve them in 135g of water, stir until they are all dissolved, and after standing for a period of time to stabilize, put a1 in the stable solution, stir and dip for 2 hours, and wait for complete dipping Afterwards, th...

Embodiment 2

[0037] [1] Add H to 1kg of metatitanic acid 2 o 2 (30wt%) 280g, stir at 30°C for 20min, gradually raise the temperature to 45°C, continue to stir for 20min, then raise the temperature to 60°C, continue stirring for 20min, then raise the temperature to 90°C, dry for 2h and crush to 200 mesh for use.

[0038] [2] Mix 30g of ammonium metatungstate and 17g of zinc nitrate to prepare 150ml of a stable solution.

[0039] [3] Take 500g of the pulverized material in step [1], add 20g of carboxymethylcellulose as a molding aid, 5g of polyacrylamide as an adhesive, 30g of glass fiber as a toughening agent, 15g of glycerin as a humectant, and expand pores Add 10g of powder flour, then add 150ml of the solution prepared in step [2], knead evenly, extrude after stale for 24 hours, then gradually increase the temperature from 30°C to dry, after 18 hours, heat up to 90°C, take it out and put it in the muffle furnace Calcined at 580°C for 2h to obtain a2.

[0040] 【4】Measuring the water ab...

Embodiment 3

[0044] [1] Mix 60g of ammonium metatungstate and 34g of zinc nitrate to prepare 169ml of stable solution.

[0045] [2] Take 400g of metatitanic acid, add 105g of metasilicate, stir until it is completely uniform, add molding aid carboxymethyl cellulose = 20.2g, add adhesive polyacrylamide 5.05g, add toughening agent glass fiber 30.3g, add 15.15g of moisturizing agent glycerin, add 10.1g of pore-enlarging agent flour, then add 169ml of the solution prepared in step [1], knead evenly, extrude after stale for 24 hours, and then gradually heat up and dry from 30°C. After 15 hours, the temperature was raised to 90°C, taken out and placed in a muffle furnace for 3 hours at 520°C to obtain a3.

[0046] [3] Measure the water absorption rate of a3 to be 30.3%.

[0047] [4] Weigh 3.25g of ammonium metavanadate, 17g of zinc nitrate, and 4.5g of oxalic acid, dissolve them in 121g of water, stir until they are all dissolved, and after standing for a period of time to stabilize, put a3 in ...

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Abstract

The invention discloses a high-specific-surface-area vanadium-zinc-series modified denitration catalyst. The catalyst is characterized in that a carrier is TiO2, TiO2-SiO2 or one of polynary inorganic oxide complex species containing TiO2, wherein TiO2 is prepared by heating and modifying metatitanic acid by virtue of H2O2; the carrier of the catalyst is in a honeycomb ceramic form; active components of the carrier include V2O5, ZnO and WO3. The catalyst has the beneficial effects that a kneading-dipping combined method is utilized in a preparation process, and Zn is added into the catalyst step-by-step, so that synergistic effects of V and Zn as well as W and Zn are exerted, and the low-temperature activity and high-temperature stability of the catalyst are guaranteed; by carrying out chemical processes of complexing and dispersing ions of the metatitanic acid and H2O2, the specific surface area and uniformity of the metatitanic acid are improved, and a next forming step is benefited; meanwhile, as the frequently-used industrial titanium dioxide is evaded, the cost is lowered.

Description

technical field [0001] The invention relates to a denitration catalyst, in particular to a vanadium-zinc modified denitration catalyst with a high specific surface area and a preparation method thereof. Background technique [0002] Nitrogen oxide is the main pollutant in the atmosphere. It is not only the main cause of nitric acid rain, but also forms photochemical smog in the air, and can also cause great harm to animals, plants and human body. [0003] Precious metals are the earliest catalysts used, mainly including Pt, Rh, Pd and so on. It is suitable for occasions where the flue gas temperature is low and it is not easy to raise. It has relatively high catalytic activity and certain anti-SO 2 and H 2 O capacity, but because the price of this type of catalyst is too expensive and the use temperature range is narrow, O in the system 2 It has inhibitory effect on the SCR response, etc., and there are limitations in its wide application. [0004] In the later period, M...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor张新堂李振兴
Owner昌邑凯特新材料有限公司