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Core-shell catalyst for denitration of FCC regeneration flue gas and preparation method of core-shell catalyst

A technology for core-shell catalysts and flue gas regeneration, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor water and sulfur resistance, easy deactivation, and short life, and achieve high The effects of water and sulfur resistance, high and low temperature activity, and strong thermal stability

Inactive Publication Date: 2017-08-11
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, catalysts in the field of FCC regeneration flue gas desulfurization and denitrification still have technical defects such as low activity, poor water and sulfur resistance, short life, and easy deactivation.

Method used

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  • Core-shell catalyst for denitration of FCC regeneration flue gas and preparation method of core-shell catalyst
  • Core-shell catalyst for denitration of FCC regeneration flue gas and preparation method of core-shell catalyst
  • Core-shell catalyst for denitration of FCC regeneration flue gas and preparation method of core-shell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1) Preparation of small grain H-Beta (Si / Al 2 =30)

[0040] First, 90g of tetrapropylammonium hydroxide (25wt%) was added to 25g of deionized water, fully stirred for 2-4 hours, then 1.74g of aluminum isopropoxide was added to the solution, and after stirring for 30-60min, 63.8g Add silica sol (40wt%) into the solution, stir for 2-4 hours, then add 0.48g of NaOH solid powder, stir for 24 hours, put it into a crystallization kettle, crystallize at 100°C for 3 days, and then centrifuge the reaction product , and then wash the lower solid with alcohol, repeat twice, dry at 100°C for 12h, and roast at 550°C for 6h to obtain nano-sized Na-Beta. Subsequently, at 80°C with 0.1mol / L NH 4 NO 3 Treated for 8 hours, fully washed, dried, and calcined at 450°C for 3 hours to obtain small-grain H-Beta molecular sieve powder with a particle size of about 100nm.

[0041] Step 2) MoFe / Beta sample preparation (the loadings of Mo and Fe are 0.2wt% and 2.0wt%) based on Beta.

[0...

Embodiment 2

[0056] Step 1) Preparation of small grain H-Beta (Si / Al 2 =30)

[0057]First, 90g of tetrapropylammonium hydroxide (25wt%) was added to 25g of deionized water, fully stirred for 2-4 hours, then 1.74g of aluminum isopropoxide was added to the solution, and after stirring for 30-60min, 63.8g Add silica sol (40wt%) into the solution, stir for 2-4 hours, then add 0.48g NaOH solid powder, stir for 24 hours, put it into a crystallization kettle, crystallize at 100°C for 5 days, and then centrifuge the reaction product , and then wash the lower solid with alcohol, repeat twice, dry at 100°C for 12h, and roast at 550°C for 6h to obtain nano-sized Na-Beta. Then, at 60°C, 0.1mol / L NH 4 NO 3 Treated for 12 hours, fully washed, dried, and calcined at 450°C for 3 hours to obtain small-grain H-Beta molecular sieve powder with a particle size of about 100nm.

[0058] Step 2) MoFe / Beta sample preparation (the loadings of Mo and Fe are 0.2wt% and 2.0wt%) based on Beta.

[0059] First take...

Embodiment 3

[0063] Step 1) Preparation of small grain H-Beta (Si / Al 2 =30)

[0064] First, 90g of tetrapropylammonium hydroxide (25wt%) was added to 25g of deionized water, fully stirred for 2-4 hours, then 1.74g of aluminum isopropoxide was added to the solution, and after stirring for 30-60min, 63.8g Add silica sol (40wt%) into the solution, stir for 2-4 hours, then add 0.48g of NaOH solid powder, stir for 24 hours, put it into a crystallization kettle, crystallize at 100°C for 3 days, and then centrifuge the reaction product , and then wash the lower solid with alcohol, repeat twice, dry at 100°C for 12h, and roast at 550°C for 6h to obtain nano-sized Na-Beta. Then, at 80°C with 0.1mol / L NH 4 NO 3 Treated for 8 hours, fully washed, dried, and calcined at 450°C for 3 hours to obtain small-grain H-Beta molecular sieve powder with a particle size of about 100nm.

[0065] Step 2) MoFe / Beta sample preparation (the loadings of Mo and Fe are 0.2wt% and 2.0wt%) based on Beta.

[0066] Fir...

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Abstract

The invention relates to the field of preparation of catalysts and particularly provides a MoFe / Beta@CeO2 core-shell catalyst which is used for FCC regeneration flue gas desulfurization and denitration, has high catalytic activity and is water-resistant and sulphur-resistant. The catalyst is the core-shell catalyst, with MoFe / Beta as a core structure and a CeO2 film as a shell structure. Further, a preparation method of MoFe / Beta comprises steps as follows: firstly, small-grain H-Beta molecular sieves with the average particle size being 100 nm are prepared; the molecular sieves are taken as carriers, active components Mo and Fe are subjected to equivalent-volume impregnation, then subjected to ultrasonic dispersion, aired at the room temperature and baked, and MoFe / Beta is prepared; MoFe / Beta is taken as the carriers and coated with CeO2 films with a self-assembly method, and the MoFe / Beta@CeO2 core-shell catalyst is prepared. The prepared MoFe / Beta@CeO2 core-shell catalyst has higher thermal stability, catalytic activity, low-temperature activity, water resistance and sulfur resistance, and the synthesis method is simple and has better application prospects.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, in particular to a MoFe / Beta@CeO 2 Core-shell catalyst and its preparation method. Background technique [0002] Core-shell catalysts are a class of particles with a double-layer or multi-layer structure, generally consisting of a central core and an outer shell. There are many methods for preparing core-shell catalysts. At present, according to different application purposes and requirements, the methods for preparing core-shell catalysts mainly include chemical deposition method, sol-gel method, self-assembly technology, microemulsion method, template method, biosynthesis method, radiation synthesis method, ultrasonic synthesis method, dispersion polymerization method, ion exchange method, atom transfer radical polymerization, etc. With the in-depth research of core-shell composite materials in various fields, their preparation methods have also been developed, and many interdisciplinary e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01J35/10B01D53/86B01D53/56B82Y30/00B82Y40/00
CPCB01D53/8628B82Y30/00B82Y40/00B01J29/7815B01D2258/0283B01J35/615B01J35/633B01J35/647
Inventor 刘坚刘计省赵震韦岳长宋卫余张潇李建梅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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