Low temperature denitration catalytic addictive and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of high denitrification rate, alkali metal poisoning, high cost, etc.

Active Publication Date: 2014-01-29
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are many patents for SCR denitrification catalysts that have been applied for. Judging from the published patents, there are mainly V2O 5 -WO 3 / TiO 2 , MnO x -CeO 2 / TiO 2 However, the catalyst of the vanadium-tungsten-titanium system has a high denitrification rate only at 300-400°C, and is not suitable for use at low temperatures. It has a strong poisoning effect, and it is easy to cause catalyst activity deactivation. Therefore, it is of great significance to study catalysts with high denitrification activity and strong resistance to alkali metal poisoning under low temperature conditions for the wide application of this low-temperature denitrification catalyst.

Method used

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  • Low temperature denitration catalytic addictive and preparation method thereof
  • Low temperature denitration catalytic addictive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0026] A TiO 2 -SiO 2 As a composite carrier, CeO 2 The manganese-based denitration catalyst as an auxiliary agent is recorded as Mn-Ce / Ti-Si where Mn:(Ti+Si)=0.8:1, Ce:(Ti+Si)=0.07:1, and the preparation includes the following steps:

[0027] In the first step, mix 34.6g of tetraethyl orthosilicate with 150ml of absolute ethanol, stir for 2 minutes, then add 3ml of acetic acid and 15ml of deionized water, stir for 5 minutes with magnetic force, and record it as solution A.

[0028] In the second step, mix 42g of tetrabutyl titanate with 150ml of absolute ethanol, stir it magnetically for 5 minutes, and record it as solution B

[0029] In the third step, mix 100ml of ethanol, 5ml of acetic acid and 25ml of deionized water evenly, and record it as solution C.

[0030] In the fourth step, add solution A in the first step to solution B dropwise to obtain a mixed solution, then add solution C dropwise to the mixed solution, put it in a water bath at 40°C and stir vigorously until...

Embodiment 3

[0034] A TiO 2 -SiO 2 As a composite carrier, CeO 2 The low-temperature denitrification catalyst with NiO as the auxiliary agent is recorded as Mn-Ni-Ce / Ti-Si, where Mn:(Ti+Si)=0.8:1, and the mass ratio of Ce, Ni and (Ti+Si) is 0.07 : 1, the preparation comprises the following steps:

[0035] In the first step, TiO is also prepared by the method in Example 2 2 -SiO 2 Composite carrier.

[0036] In the second step, 56.9g of manganese acetate, 7.6g of cerium nitrate, and 5.1g of nickel nitrate were dissolved in deionized water, magnetically stirred until completely dissolved, and 5g of TiO 2 -SiO 2 Immerse the composite carrier into the solution, stir magnetically for 20 minutes, let it stand for 10 hours, put it in a drying oven at 110°C to dry, and after drying, put it in a muffle furnace for calcination at 450°C for 4 hours, and grind to obtain the finished product Mn-Ni- Ce / Ti-Si catalyst.

Embodiment 4

[0038] A TiO 2 -SiO 2 As a composite carrier, CeO 2 The low-temperature denitrification catalyst with FeOx as the auxiliary agent is recorded as Mn-Fe-Ce / Ti-Si, where Mn: (Ti+Si) = 0.8:1, and the mass ratio of Ce, Fe and (Ti+Si) is 0.07:1, the preparation includes the following steps:

[0039] In the first step, TiO is also prepared by the method in Example 2 2 -SiO 2 Composite carrier.

[0040] In the second step, dissolve 56.9g of manganese acetate, 7.6g of cerium nitrate, and 7.1g of ferric nitrate in deionized water, stir magnetically until the dissolution is complete, and weigh 5g of TiO 2 -SiO 2 Immerse the composite carrier into the solution, stir it magnetically for 20 minutes, let it stand for 10 hours, put it in a drying oven to dry at 110°C, put it into a muffle furnace for calcination at 450°C for 4 hours after drying, and grind to obtain the finished product Mn-Fe- Ce / Ti-Si catalyst.

[0041] The above four catalysts are all in the form of NH 3 For reduci...

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Abstract

The invention discloses a low temperature denitration catalytic addictive and a preparation method thereof, and belongs to the field of low temperature denitration catalyst. According to the low temperature denitration catalytic addictive, TiO2-SiO2 is taken as carrier, manganese oxide (MnOx) is taken as active substance, and cerium oxide (CeO2), nickel oxide (NiO) and iron oxide (FeOx) are taken as auxiliary agents. The preparation method comprises following steps: TiO2-SiO2 composite carrier is prepared by sol-gel method; loading of CeO2, NiO or FeOx is realized by one-step dipping; and then the low temperature denitration catalytic addictive is obtained by calcination. The low temperature denitration catalytic addictive possesses high low-temperature denitration catalytic efficiency, wide active temperature window, and relatively high alkali metal poisoning resistance. TiO2-SiO2 is low in cost, and specific area of TiO2-SiO2 is larger than that of pure TiO2 carrier, so that it is beneficial for dispersion of active substances on the surface of TiO2-SiO2, and stability of the active substances. Auxiliary agent NiO or FeOx are capable of increasing low-temperature activity and alkali metal poisoning resistance of the low temperature denitration catalytic addictive, so that the low temperature denitration catalytic addictive is suitable for denitration in dedusted cement kiln at low temperature or even under conditions with unstable temperature.

Description

technical field [0001] The invention belongs to the technical field of low-temperature denitrification catalysts, in particular to an SCR denitrification catalyst under low-temperature conditions after cement kiln waste heat power generation and dust removal. Background technique [0002] NO x and SO 2 It is one of the air pollutants and the main source of acid rain. Human activities, fuel combustion, industrial production, etc. may produce NO x , NO x Mainly includes N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 Wait, NO x Pollution has become a growing global problem. In the past decade, my country's SO 2 Emissions have been extensively governed and effectively controlled. while NO x The work of pollution emission control is in the ascendant in our country. During the "Twelfth Five-Year Plan" period, NO x It is included in the binding index system for the first time, and the total emission must be reduced by 10%. In 2010, my country's cement output was ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/90B01D53/56
Inventor 崔素萍罗小根郭红霞马晓宇刘庆祎张良静
Owner BEIJING UNIV OF TECH
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