Preparation method and application of Fe-ZSM-5 doped Rh and Er composite catalyst

A fe-zsm-5, catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of high stability

Inactive Publication Date: 2016-09-28
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 doped Rh and Er composite catalyst
  • Preparation method and application of Fe-ZSM-5 doped Rh and Er composite catalyst
  • Preparation method and application of Fe-ZSM-5 doped Rh and Er composite catalyst

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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 0.3mol.L -1 The 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: 1.5mol. The above process is repeated twice, filtered, washed 4 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 0.01mol.L -1 Fe(NO 3 ) 3 Medium, ion exchange at 70°C for 3h, where NH 4 -ZSM-5 molecular sieve and Fe(NO 3 ) 3 The ratio is 100g:0.05mol. The ion exchange of the precursor is repeated twice, filtered, washed four times, dried at 130°C for 20h, and calcined at 450°C for 4h to obtain Fe-ZSM-5.

[0022] (2) Catalyst of the present invention, at 120,000mL.(g.h) -1 At air speed, 300ppm NH 3 , 10vl.%O 2 Concentration and 5wt% H 2 Under the condition of O concentration, in a wide temperature range (150 ° C ~ 550 ° C), it has high catalytic activity to eliminate low concentration NO (500 ...

Embodiment 2

[0024] (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(NO 3 ) 3 Medium, ion exchange at 60°C for 2h, where NH 4 -ZSM-5 molecular sieve and Fe(NO 3 ) 3 The ratio is 100g:0.02mol, and the ion exchange of the precursor is repeated once, filtered, washed three times, and dried at 120°C for 18 hours to obtain the Fe-ZSM-5 precursor. Then mix 0.0001mol.L evenly -1 Rh(NO 3 ) 3 solution and 0.0001mol.L -1 Er(NO 3 ) 3 solution, in which Rh(NO 3 ) 3 with Er(NO 3 ) 3 The molar ratio is 1:1, the Fe-ZSM-5 precursor prepared above is added to the above mixed solution, and impregnated for 24 hours by impregnation method, ...

Embodiment 3

[0027] (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(NO 3 ) 3 In, ion exchange at 780°C for 3h, where NH 4 -The ratio of ZSM-5 molecular sieve to Fe(NO3)3 is 100g:0.035mol. The ion exchange of the precursor is repeated twice, filtered, washed 4 times, and dried at 130°C for 20h to obtain the Fe-ZSM-5 precursor. Then mix 0.0002mol.L evenly -1 Rh(NO 3 ) 3 solution and 0.0002mol.L -1 Er(NO 3 ) 3 solution, in which Rh(NO 3 ) 3 with Er(NO 3 ) 3 The molar ratio is 1:1, the Fe-ZSM-5 precursor prepared above is added to the above mixed solution, and impregnated for 36 hours by impregnation method, wherein, the Fe-...

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Abstract

The invention provides a preparation method and application of a Fe-ZSM-5 doped Rh and Er composite catalyst. The preparation method comprises the following steps: preparing a sodium type high-silicon-aluminum-rate Na-ZSM-5 molecular sieve by virtue of a hydrothermal method, exchanging the sodium type high-silicon-aluminum-rate Na-ZSM-5 molecular sieve and NH4Cl to prepare an ammonium type NH4-ZSM-5 molecular sieve, adding the NH4-ZSM-5 molecular sieve into a ferric nitrate solution, preparing a Fe-ZSM-5 molecular sieve by virtue of an ion exchange method, and doping a small amount of Rh and Er to prepare a high-silicon-aluminum-rate (350 to 420m<2>/g) composite Rh-Er/Fe-ZSM-5 catalyst by virtue of an impregnation method. The prepared catalyst has good catalytic removal effects (NO conversion rate of 45 to 95 percent) on high-airspeed, high-O2-concentration, high-H2O-content and low-NO-concentration (300 to 1,000ppm) pollutants within a wider temperature (150 to 650 DEG C) range. Moreover, the initial NO conversion rate of the catalyst within 100 hours within the wide temperature range (150 to 650 DEG C) is maintained.

Description

technical field [0001] The invention relates to a preparation method of a Fe-ZSM-5 doped Rh and Er 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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01D53/86B01D53/56
CPCB01J29/46B01D53/8628B01D2255/504B01D2257/404
Inventor 张志昊叶青纪树兰
Owner BEIJING UNIV OF TECH
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