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Preparation method and application of Cu-ZSM-5 doped Zr and Sr composite catalyst

A technology of cu-zsm-5, 1.cu-zsm-5, applied in the field of preparation and application of Cu-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

Moreover, the catalyst preparation process is simple

Method used

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  • Preparation method and application of Cu-ZSM-5 doped Zr and Sr composite catalyst
  • Preparation method and application of Cu-ZSM-5 doped Zr and Sr composite catalyst
  • Preparation method and application of Cu-ZSM-5 doped Zr and Sr composite catalyst

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Experimental program
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Effect test

Embodiment 1

[0023] (1) Combine Na-ZSM-5 molecular sieve with a silicon-to-aluminum ratio of 20mol:1mol and 0.1mol.L -1 NH 4 The Cl solution was ion-exchanged at 60℃ 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, filtering, washing 3 times, and drying at 120°C for 18h to obtain NH 4 -ZSM-5 molecular sieve; the obtained NH 4 -ZSM-5 molecular sieve is added to 0.01mol.L -1 Cu(OAc) 2 Medium, 60℃ ion exchange 2h, where NH 4 -ZSM-5 molecular sieve and Cu(OAc) 2 The ratio is 100g:0.03mol. According to the above process, repeat once, filter, wash 3 times, and dry at 120°C for 18 hours to obtain Cu-ZSM-5 precursor. Then evenly mix 0.001mol.L -1 Zr(NO 3 ) 4 Solution and 0.001mol.L -1 Sr(NO 3 ) 2 Solution in which Zr(NO 3 ) 4 With Sr(NO 3 ) 2 The ratio is 1:1, the Cu-ZSM-5 precursor prepared above is added to the above mixed solution, and the immersion method is used for 24h. Among them, the Cu-ZSM-5 precursor and Zr(NO 3 ) 4 The ra...

Embodiment 2

[0026] (1) Na-ZSM-5 molecular sieve with a silicon-to-aluminum ratio of 23mol:1mol and 0.3mol.L -1 NH 4 The Cl solution was ion-exchanged at 70℃ 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, filtering, washing 4 times, and drying at 130°C for 20h to obtain NH 4 -ZSM-5 molecular sieve; the obtained NH 4 -ZSM-5 molecular sieve is added to 0.015mol.L -1 Cu(OAc) 2 Medium, 780℃ ion exchange 3h, where NH 4 -ZSM-5 molecular sieve and Cu(OAc) 2 The ratio is 100g:0.05mol. According to the above process, repeat 2 times, filter, wash 4 times, and dry at 130°C for 20 hours to obtain Cu-ZSM-5 precursor. Then mix evenly 0.002mol.L -1 Zr(NO 3 ) 4 Solution and 0.002mol.L -1 Sr(NO 3 ) 2 Solution in which Zr(NO 3 ) 4 With Sr(NO 3 ) 2 The ratio is 1:1, the Cu-ZSM-5 precursor prepared above is added to the above mixed solution, and the immersion method is used for 36h. Among them, the Cu-ZSM-5 precursor and Zr(NO 3 ) 4 The rati...

Embodiment 3

[0029] (1) Combine Na-ZSM-5 molecular sieve with a silicon-to-aluminum ratio of 25mol:1mol and 0.5mol.L -1 NH 4 The Cl solution was ion-exchanged at 80℃ 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; the obtained NH 4 -ZSM-5 molecular sieve is added to 0.024mol.L -1 Cu(OAc) 2 Medium, 80℃ ion exchange for 5h, where NH 4 -ZSM-5 molecular sieve and Cu(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 Cu-ZSM-5 precursor. Then mix evenly 0.003mol.L -1 Zr(NO 3 ) 4 Solution and 0.003mol.L -1 Sr(NO 3 ) 2 Solution in which Zr(NO 3 ) 4 With Sr(NO 3 ) 2 The ratio is 1:1, the Cu-ZSM-5 precursor prepared above is added to the above mixed solution, and the impregnation method is used for 48h. Among them, the Cu-ZSM-5 precursor and Zr(NO 3...

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Abstract

The invention provides a preparation method and an application of a Cu-ZSM-5 doped Zr and Sr composite catalyst. The composite Zr-Sr / Cu-ZSM-5 catalyst which is high in specific surface area (350-400m2 / g) is prepared by the following steps: exchanging a Na-ZSM-5 molecular sieve with NH4Cl to prepare an amino type NH4-ZSM-5 molecular sieve; then, adding a copper acetate solution to the NH4-ZSM-5 molecular sieve, preparing a Cu-ZSM-5 molecular sieve by virtue of an ion exchange method, and doping little Zr and Sr by virtue of an impregnation method. Within a relatively wide temperature range, the catalyst has a high catalytic elimination effect (NO conversion rate is 50-97%) for pollutants which are high in space velocity (120,000-360,000mL.(g.h)-1), high in O2 concentration (10-20vl%), high in H2O content (5-10wt%) and low in NO concentration (300-1000ppm). By adding a hydrocarbon compound (100-300ppm propylene) to a reaction system, the catalyst is high in anti-carbon-deposition performance.

Description

Technical field [0001] The invention relates to a preparation method of a Cu-ZSM-5 doped Zr and Sr composite catalyst for catalytic elimination of NO and its application for 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 hot issues of atmospheric environment along with ozone layer destruction and global climate change. Cause NO x The reasons for the occurrence of can be divided into two aspects: natural sources and man-made sources. Automobile exhaust (mobile sources) and coal-fired boilers (stationary sources) in power plants account for more than 90% of total man-made emissions. It is esti...

Claims

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Application Information

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