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

A kind of preparation method of Sn-based microporous molecular sieve Nox-Scr catalyst

A microporous molecular sieve and molecular sieve technology, applied in the fields of environmental protection and air pollution control, to achieve the effects of superior catalytic stability and excellent catalytic activity

Active Publication Date: 2017-11-03
NANCHANG UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no literature or patent reports on the use of Sn-based zeolite molecular sieves for the removal of nitrogen oxides.

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
  • A kind of preparation method of Sn-based microporous molecular sieve Nox-Scr catalyst
  • A kind of preparation method of Sn-based microporous molecular sieve Nox-Scr catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Tetraethyl orthosilicate, sodium aluminate and tin tetrachloride are used as precursors, tetrapropylammonium hydroxide is used as a template, and the reaction is carried out according to the Sn / Al molar ratio of 2:1, filtered, washed, dried, and 2 o C / min heating rate at 550 o C for 6 h to obtain the example 1 in situ synthesis method Sn-based molecular sieve catalyst sample. 0.1 g of the catalyst prepared at 550 o C under pretreatment for 30 min, then cooled to room temperature, and then 10 o The temperature is programmed at C / min rate, and a mixed reaction gas with a total flow rate of 100 ml / min is introduced, which contains 0.4% CH 4 , 0.6%NO, 6%O 2 , detection 300 – 600 o C temperature range NO x Conversion rate.

Embodiment 2

[0024] Tetraethyl orthosilicate, sodium aluminate and tin tetrachloride were used as precursors, tetrapropylammonium hydroxide was used as a template, and the reaction was carried out according to the Sn / Al molar ratio of 1:1, filtered, washed, dried, and 2 o C / min heating rate at 550 o C for 6 h to obtain the example 2 in situ synthesis method Sn-based molecular sieve catalyst sample. 0.1 g of the catalyst prepared at 550 o C under pretreatment for 30 min, then cooled to room temperature, and then 10 o The temperature is programmed at C / min rate, and a mixed reaction gas with a total flow rate of 100 ml / min is introduced, which contains 0.4% CH 4 , 0.6%NO, 6%O 2 , detection 300 – 600 o C temperature range NO x Conversion rate.

Embodiment 3

[0026] Tetraethyl orthosilicate, sodium aluminate and tin tetrachloride were used as precursors, tetrapropylammonium hydroxide was used as a template, and the reaction was carried out according to the Sn / Al molar ratio of 1:2, filtered, washed, dried, and 2 o C / min heating rate at 550 o C for 6 h to obtain the example 3 in situ synthesis method Sn-based molecular sieve catalyst sample. 0.1 g of the catalyst prepared at 550 oC under pretreatment for 30 min, then cooled to room temperature, and then 10 o The temperature is programmed at C / min rate, and a mixed reaction gas with a total flow rate of 100 ml / min is introduced, which contains 0.4% CH 4 , 0.6%NO, 6%O 2 , detection 300 – 600 o C temperature range NO x Conversion rate.

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

No PUM Login to View More

Abstract

A method for preparing a Sn-based microporous molecular sieve NOx-SCR catalyst is to modify and modify commercial molecular sieve ZSM-5, mordenite (MOR), Beta molecular sieve and other microporous molecular sieves with Sn through an in-situ synthesis method or an ion exchange method. The Sn-based microporous molecular sieve is prepared by introducing the component Sn into the molecular sieve framework. The SCR catalyst prepared by the invention realizes the selective reduction of NOx to N2 to the greatest extent, and after 60 hours of reaction, the catalytic activity of the catalyst does not decrease in any way, and is an efficient and high-stability NOx removal catalyst. It still has high catalytic activity in the presence of water or water vapor, and exhibits excellent resistance to water deactivation. The invention has low cost, simple and easy production process and long service life.

Description

technical field [0001] The invention relates to a preparation method of a Sn-based microporous molecular sieve NOx-SCR catalyst, which is mainly used for NO in automobile tail gas or factory flue gas x Purification treatment belongs to the field of environmental protection and air pollution control. technical background [0002] In today's world, the rapid development of the transportation industry such as automobiles and the large-scale chemical industry such as petroleum has promoted the rapid development of science and technology, and has also brought serious harm to the environment on which human beings depend. In the past ten years, air pollution in major cities in China has been serious. The composition of air pollutants is very complex, nitrogen oxides (NO x ) is one of the main components. NO x The sources of gas can be divided into static sources and dynamic sources, typical representatives of which are factory flue gas and motor vehicle exhaust. NO x It is ve...

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
Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/18B01J29/40B01J29/70B01D53/90B01D53/56
Inventor 王翔彭洪根彭跃刘文明
Owner NANCHANG UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com