Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Cerium/molecular sieve catalyst used for selective catalytic reduction of nitrogen oxides and preparation method thereof

A nitrogen oxide and selective catalysis technology, applied in the field of catalysis, can solve the problems of poor selectivity at high temperature, hazards to the ecological environment and human health, narrow operating temperature window, etc., and achieve the effect of easy coating, no poisonous effect, and simple use conditions

Active Publication Date: 2012-12-12
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
View PDF1 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the NH 3 -The SCR vanadium-based catalyst system has the problems of narrow operating temperature window, poor high-temperature selectivity and potential hazards to the ecological environment and human health, and provides a cerium / molecular sieve catalyst for selective catalytic reduction of nitrogen oxides and its preparation method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cerium/molecular sieve catalyst used for selective catalytic reduction of nitrogen oxides and preparation method thereof
  • Cerium/molecular sieve catalyst used for selective catalytic reduction of nitrogen oxides and preparation method thereof
  • Cerium/molecular sieve catalyst used for selective catalytic reduction of nitrogen oxides and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of cerium oxide nanoparticles

[0034] Mix ethanol and oleic acid in a beaker, add NaOH solution, stir evenly, weigh cerium ammonium nitrate and dissolve it in water, add the above solution dropwise, transfer to the reaction kettle, and conduct a hydrothermal reaction at 120°C to obtain CeO 2 Nanoparticles;

[0035] (2) Preparation of cerium / molecular sieve catalyst

[0036] Take by weighing 0.50g cerium oxide nanoparticles and disperse it in 15ml normal hexane, add 0.50g molecular sieve MCM56 (n(SiO 2 ) / n(Al 2 o 3 )=25), stirred for 1 day to make it uniform, heated at 50°C and stirred until the solution evaporated to dryness, dried the obtained sample at 100°C overnight, raised the temperature to 550°C at 1°C / min, and roasted in air for 1h to obtain A cerium / molecular sieve catalyst for nitrogen oxides, referred to as Catalyst 1. Finally, the catalyst is pressed into tablets, ground, and sieved to obtain 40-80 mesh particles for later use.

[0037...

Embodiment 2

[0040] (1) The preparation of cerium oxide nanoparticles is the same as in Example 1;

[0041] (2) Preparation of cerium / molecular sieve catalyst

[0042] Take by weighing 0.15g cerium oxide nanoparticles and disperse it in 15ml normal hexane, add 0.85g molecular sieve MCM56 (n(SiO 2 ) / n(Al 2 o 3 )=25), stirred for 1 day to make it uniform, heated at 50°C and stirred until the solution evaporated to dryness, dried the obtained sample at 100°C overnight, raised the temperature to 550°C at 1°C / min, and roasted in air for 1h to obtain A cerium / molecular sieve catalyst for nitrogen oxides, referred to as Catalyst 2. Finally, the catalyst is pressed into tablets, ground, and sieved to obtain 40-80 mesh particles for later use.

Embodiment 3

[0044] (1) The preparation of cerium oxide nanoparticles is the same as in Example 1;

[0045] (2) Preparation of cerium / molecular sieve catalyst

[0046] Weigh 0.25g cerium oxide nanoparticles and disperse it in 15ml normal hexane, add 0.75g molecular sieve MCM56 (n(SiO 2 ) / n(Al 2 o3 )=25), stirred for 1 day to make it uniform, heated at 50°C and stirred until the solution evaporated to dryness, dried the obtained sample at 100°C overnight, raised the temperature to 550°C at 1°C / min, and roasted in air for 1h to obtain A cerium / molecular sieve catalyst for nitrogen oxides, referred to as Catalyst 3. Finally, the catalyst is pressed into tablets, ground, and sieved to obtain 40-80 mesh particles for later use.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a cerium / molecular sieve catalyst used for selective catalytic reduction of nitrogen oxides and a preparation method thereof. The invention overcomes the technical problems of a narrow operating temperature window, poor selectivity at a high temperature and potential harm to the ecological environment and human health of a vanadium-based catalyst system. The catalyst provided by the invention comprises a cerium oxide nanoparticle and a molecular sieve, wherein the molecular formula of the cerium oxide nanoparticle is CeO2, the molecular sieve is MCM56 (n(SiO2) / n(Al2O3)=15-30), and the mass ratio of the cerium oxide nanoparticle to the molecular sieve is 1:19 to 3:1. The invention also provides a preparation method for the catalyst. The preparation method comprises the following steps: synthesizing the cerium oxide nanoparticle by using a hydro-thermal synthesis method; and loading the cerium oxide nanoparticle on the molecular sieve MCM56 for removal of nitrogen oxides through NH3-SCR. The supported catalyst prepared by using the method has the advantages of uniformly dispersed active components, high activity, a wide temperature range and good stability.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a cerium / molecular sieve catalyst for selective catalytic reduction of nitrogen oxides and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO X ) is a general term for five common oxides of nitrogen, including N 2 O, NO, N 2 o 3 , NO 2 and N 2 o 5 , where NO and NO 2 It has the highest proportion in the atmospheric environment and is one of the main pollutants in the atmosphere today. NO X The existence of photochemical smog, acid rain, greenhouse effect and ozone layer depletion will cause major environmental problems. At the same time, due to NO X It has biological respiratory toxicity, which has caused great harm to the ecological environment and human health. In order to protect the environment, countries around the world, especially developed countries, X There are strict restrictions on emissions, and the emission stand...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J29/70B01D53/90B01D53/94B01D53/56
Inventor 杨向光张一波王德强潘喜强张震东张彬苗珍珍邬天笑
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com