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Preparation method and application of Fe-ZSM-5 Zr and Sr doped compound catalyst

A technology of fe-zsm-5, 1.fe-zsm-5, applied in the field of preparation and application of Fe-ZSM-5 doped Zr and Sr composite catalyst

Inactive Publication Date: 2015-07-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst preparation process is simple

Method used

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  • Preparation method and application of Fe-ZSM-5 Zr and Sr doped compound catalyst
  • Preparation method and application of Fe-ZSM-5 Zr and Sr doped compound catalyst
  • Preparation method and application of Fe-ZSM-5 Zr and Sr doped compound catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Na-ZSM-5 molecular sieve with a silicon-aluminum ratio of 20mol:1mol and 0.1mol.L -1 NH 4 Cl solution was ion-exchanged at 60°C for 2h, in which Na-ZSM-5 molecular sieve and NH 4 The ratio of Cl is 100g:0.6mol, the above process is repeated once, filtered, washed three times, and dried at 120°C for 18h to obtain NH 4 -ZSM-5 molecular sieve; Gained NH 4 -ZSM-5 molecular sieve added to 0.01mol.L -1 Fe(OAc) 2 Medium, ion exchange at 60°C for 2h, where NH 4 -ZSM-5 molecular sieve and Fe(OAc) 2 The ratio is 100g:0.03mol. According to the above process, repeat once, filter, wash three times, and dry at 120°C for 18h to obtain the Fe-ZSM-5 precursor. Then mix 0.001mol.L evenly -1 Zr(NO 3 ) 4 solution and 0.001mol.L -1 Sr(NO 3 ) 2 solution, where Zr(NO 3 ) 4 and Sr(NO 3 ) 2 The ratio is 1:1, the Fe-ZSM-5 precursor prepared above is added to the above mixed solution, and impregnated for 24h by impregnation method, wherein, the Fe-ZSM-5 precursor and Zr(NO 3 ...

Embodiment 2

[0024] (1) Na-ZSM-5 molecular sieve with a silicon-aluminum ratio of 23mol:1mol and 0.3mol.L -1 NH 4 Cl solution was ion-exchanged at 70°C for 3h, in which Na-ZSM-5 molecular sieve and NH 4 The ratio of Cl is 100g:2.0mol, the above process is repeated twice, filtered, washed four times, and dried at 130°C for 20h to obtain NH 4 -ZSM-5 molecular sieve; Gained NH 4 -ZSM-5 molecular sieve added to 0.015mol.L -1 Fe(OAc) 2 In, ion exchange at 780°C for 3h, where NH 4 -ZSM-5 molecular sieve and Fe(OAc) 2 The ratio is 100g:0.05mol. Repeat the above process twice, filter, wash four times, and dry at 130°C for 20 hours to obtain the Fe-ZSM-5 precursor. Then mix 0.002mol.L evenly -1 Zr(NO 3 ) 4 solution and 0.002mol.L -1 Sr(NO 3 ) 2 solution, where Zr(NO 3 ) 4 and Sr(NO 3 ) 2 The ratio is 1:1, the Fe-ZSM-5 precursor prepared above is added to the above mixed solution, and impregnated for 36h by impregnation method, wherein, the Fe-ZSM-5 precursor and Zr(NO 3 ) 4 The ra...

Embodiment 3

[0027] (1) Na-ZSM-5 molecular sieve with a silicon-aluminum ratio of 25mol:1mol and 0.5mol.L -1 NH 4 Cl solution was ion-exchanged at 80°C for 5h, in which Na-ZSM-5 molecular sieve and NH 4 The ratio of Cl is 100g:3.0mol, the above process is repeated 3 times, filtered, washed 5 times, and dried at 40°C for 24h to obtain NH 4 -ZSM-5 molecular sieve; Gained NH 4 -ZSM-5 molecular sieve added to 0.024mol.L -1 Fe(OAc) 2 In, ion exchange at 80°C for 5h, where NH 4 -ZSM-5 molecular sieve and Fe(OAc) 2 The ratio is 100g:0.072mol. According to the above process, repeat 3 times, filter, wash 5 times, and dry at 140°C for 24 hours to obtain the Fe-ZSM-5 precursor. Then mix 0.003mol.L evenly -1 Zr(NO 3 ) 4 solution and 0.003mol.L -1 Sr(NO 3 ) 2 solution, where Zr(NO 3 ) 4 and Sr(NO 3 ) 2 The ratio is 1:1, the Fe-ZSM-5 precursor prepared above is added to the above mixed solution, and impregnated for 48h by impregnation method, wherein, the Fe-ZSM-5 precursor and Zr(NO 3 ...

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Abstract

The invention provides a preparation method and application of a Fe-ZSM-5 Zr and Sr doped compound catalyst. A Na-ZSM-5 molecular sieve is replaced with NH4Cl to prepare an ammonia type NH4-ZSM-5 molecular sieve and then the NH4-ZSM-5 molecular sieve is added into an iron acetate solution to prepare a Fe-ZSM-5 molecular sieve; and small amount of Zr and Sr are doped through an immersing method to prepare a compound Zr-Sr / Fe-ZSM-5 catalyst with a high specific surface area (350m<2> / g-400m<2> / g). The prepared catalyst has a high catalytic elimination effect (NO conversion rate is 45%-95%) on pollutants with a high airspeed (120,000mL. / (g.h)-360,000mL. / (g.h)), high O2 concentration (10vl.%-20vl.%), high H2O content (5wt%-10wt%) and low NO concentration (300ppm-1000ppm) in a relatively wide temperature range (150-650 DEG C). The catalyst can keep the NO initial conversion rate within 100 hours under the relatively wide temperature range (150-650 DEG C).

Description

technical field [0001] The invention relates to a preparation method of a Fe-ZSM-5 doped Zr and Sr composite catalyst for catalytic elimination of NO and its application of selective catalytic elimination of NO. Background technique [0002] Nitrogen oxides (NO x ) is a major pollutant in the atmosphere, which has great harm to the ecological environment and human health. It not only causes acid rain, but also forms the precursor of near-surface atmospheric ozone pollution, secondary fine particle pollution, and surface water eutrophication. , the resulting environmental problems have become the most prominent atmospheric environmental hotspot issues together with the destruction of the ozone layer and global climate change. causing NO x The reasons for the generation of sputum can be divided into two aspects: natural sources and man-made sources. NOx emissions from automobile exhaust (mobile source) and coal-fired boilers in power plants (stationary source) account for m...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01D53/86B01D53/56
Inventor 叶青李扬齐芸芳张志昊程水源康天放王道
Owner BEIJING UNIV OF TECH
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