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Molybdenum-modified Fe-ZSM5 molecular sieve catalyst as well as preparation method and application thereof

A molecular sieve and catalyst technology, applied in the field of selective reduction catalyst and its preparation, can solve the problems of insufficient low-temperature catalytic activity, poor hydrothermal aging resistance, poor SCR activity, etc., and achieve good anti-sulfur dioxide poisoning performance, performance improvement, and performance optimization Effect

Active Publication Date: 2020-06-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although Fe-based catalysts have many excellent properties, their low-temperature catalytic activity is insufficient, their hydrothermal aging resistance is poor, and their NO 2 The disadvantages of high sensitivity have limited its wide application. How to optimize the overall performance of Fe-based catalysts is a current research hotspot.
Fe-based molecular sieve (Fe-ZSM5) has ideal high-temperature activity, but poor SCR activity at low temperature, NO x low conversion rate

Method used

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  • Molybdenum-modified Fe-ZSM5 molecular sieve catalyst as well as preparation method and application thereof
  • Molybdenum-modified Fe-ZSM5 molecular sieve catalyst as well as preparation method and application thereof
  • Molybdenum-modified Fe-ZSM5 molecular sieve catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A molybdenum-modified Fe-ZSM5 molecular sieve selective reduction catalyst is prepared by the following method:

[0038] (1) Preparation of hydrogen-type molecular sieve: 50.0g of Na-ZSM5 molecular sieve with a silicon-aluminum ratio of 60mol:1mol and 1000ml of 0.5mol.L -1 NH 4 NO 3 The solution was ion-exchanged at 80°C for 2 hours, repeated twice, filtered, washed three times, dried at 100°C for 24 hours, and calcined at 550°C for 3 hours to obtain hydrogen molecular sieves.

[0039] (2) Preparation of Fe-ZSM5 molecular sieve: Weigh about 40.0g of the hydrogen-type molecular sieve prepared in step (1) and add it to 60ml0.2mol.L -1 Fe(NO 3 ) 2 In the solution, ion exchange was carried out in a water bath at 80°C for 3 hours, and repeated once, filtered and washed three times, dried at 120°C for 20 hours, and calcined at 500°C for 2 hours to obtain Fe-ZSM5 molecular sieves.

[0040] (3) Preparation of molybdenum-modified Fe-ZSM5 molecular sieve: 0.6g of lanthanum o...

Embodiment 2

[0050] A molybdenum-modified Fe-ZSM5 molecular sieve selective reduction catalyst is prepared by the following method:

[0051] (1) Preparation of hydrogen-type molecular sieve: 50.0g of Na-ZSM5 molecular sieve with a silicon-aluminum ratio of 60mol:1mol and 1000ml of 0.5mol.L -1 NH 4 NO 3 The solution was ion-exchanged twice for 2 hours in a water bath at 80°C, filtered, washed three times, dried at 110°C for 36 hours, and calcined at 500°C for 4 hours to obtain a hydrogen molecular sieve.

[0052] (2) Preparation of Fe-ZSM5 molecular sieve: Weigh 50.0 g of hydrogen ZSM5 molecular sieve prepared in step (1) and add to 60ml0.4mol.L -1 Fe(NO 3 ) 2 In the solution, ion exchange was carried out in a water bath at 60°C for 3 hours, repeated once, filtered, washed 3 times, dried at 120°C for 20 hours, and calcined at 500°C for 3 hours to obtain Fe-ZSM5 molecular sieve.

[0053] (3) Preparation of molybdenum modified Fe-ZSM5 molecular sieve: add 0.5g lanthanum oxide to 60ml 0.2...

Embodiment 3

[0056] A molybdenum-modified Fe-ZSM5 molecular sieve selective reduction catalyst is prepared by the following method:

[0057] (1) Preparation of hydrogen-type molecular sieve: 50.0g of Na-ZSM5 molecular sieve with a silicon-aluminum ratio of 80mol:1mol and 1200ml of 0.4mol.L -1 NH 4 NO 3 The solution was ion-exchanged at 80°C for 2 hours twice, filtered, washed three times, dried at 100°C for 24 hours, and calcined at 550°C for 5 hours to obtain hydrogen molecular sieves.

[0058] (2) Preparation of Fe-ZSM5 molecular sieve: Weigh about 50.0g of the hydrogen-type ZSM5 molecular sieve prepared in step (1) and add it to 60ml 0.4mol.L -1 Fe(NO 3 ) 2 In the solution, ion exchange was carried out in a water bath at 75°C for 3h, repeated once, filtered, washed three times, dried at 130°C for 20h, and calcined at 500°C for 3h to obtain Fe-ZSM5.

[0059] (3) Preparation of molybdenum modified Fe-ZSM5 molecular sieve: add 0.6g lanthanum oxide to 60ml 0.1mol.L -1 Ammonium molybda...

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Abstract

The invention relates to a selective reduction catalyst, in particular to a molybdenum-modified Fe-ZSM5 molecular sieve catalyst as well as a preparation method and an application thereof. An H-ZSM5 zeolite molecular sieve is adopted as a matrix, iron ions are introduced into the matrix in a liquid ion exchange mode, and the molecular sieve is obtained after drying and roasting; molybdenum ions and lanthanum oxide are doped by an impregnation method, a dispersing agent and an active component introducing agent are added, drying is carried out again, and roasting is performed to obtain the molybdenum-modified molecular sieve; pseudo-boehmite and a tackifier are added, stirring is carried out in a ball-milling stirrer, the materials are magnetically stirred for 0.5-2 hours to obtain slurry before coating, and the slurry is loaded on a carrier material with regular pores to prepare the iron and cerium modified beta molecular sieve selective reduction catalyst. The molybdenum-modified Fe-ZSM5 molecular sieve selective catalytic reduction catalyst prepared by the patent of the invention can be ignited at a relatively low temperature and has a relatively wide stable conversion temperature window.

Description

technical field [0001] The present invention relates to a selective reduction catalyst (SCR) and its preparation method and application, in particular to a metal-modified selective reduction catalyst and its preparation method and application, and further relates to a molybdenum and lanthanum bimetallic modified Fe-ZSM5 molecular sieve selective reduction catalyst and its preparation method and application. The modified Fe-ZSM5 molecular sieve is used as a catalyst for the treatment of exhaust gas treatment systems, especially as a catalyst for the treatment of exhaust gas treatment systems containing nitrogen oxides (NOx) gas streams, especially as a catalyst for the treatment of NO content In the exhaust gas treatment system in the case of exceeding 50% of nitrogen oxides (NOx). The invention belongs to the field of catalyst preparation and application of selective catalytic reduction (SCR) denitrification. Background technique [0002] Nitrogen oxides (NO x ) will caus...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01J35/04F01N3/20B01D53/94B01D53/56B01D53/86
CPCB01J29/48F01N3/2066B01D53/9418B01D53/8628B01J2229/18F01N2370/04B01D2251/2062B01D2251/2067B01D2251/202B01J35/56Y02T10/12
Inventor 王攀于丹金苗苗雷利利乔冠军
Owner JIANGSU UNIV
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