Molecular sieve SCR catalyst and preparation method thereof

A technology of SCR catalyst and molecular sieve, applied in the field of molecular sieve SCR catalyst and preparation, can solve the problems of low conversion rate, easy occurrence of hydrocarbon poisoning, low temperature performance, etc., and achieve cost reduction, high hydrothermal stability performance, and wide active temperature window. Effect

Inactive Publication Date: 2021-08-31
SINOCAT ENVIRONMENTAL TECH
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the low conversion rate of copper-based catalysts in the prior art at low temperatures, the decline in high-temperature performance, and the easy occurrence of hydrocarbon poisoning, and to provide a molecular sieve SCR catalyst and a preparation method that uses a relatively low silicon-aluminum ratio The small-pore molecular sieve material, through the addition of the second active component yttrium, the catalyst prepared by NO x Exhibits excellent catalytic activity, wide active temperature window, high hydrothermal stability and good resistance to hydrocarbon poisoning

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
  • Molecular sieve SCR catalyst and preparation method thereof
  • Molecular sieve SCR catalyst and preparation method thereof
  • Molecular sieve SCR catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of copper solution: Heat 50g of deionized water to 60°C, add 19.03g of copper nitrate trihydrate and 6.05g of citric acid, stir and dissolve, and prepare a copper solution.

[0034] (2) Ion exchange: Heat 200g of deionized water to 80°C, add 6.03g of yttrium nitrate hexahydrate and stir to dissolve completely, keep the temperature at 80°C, add 140g of H-SSZ-13 with a silicon-aluminum ratio of 13 and keep stirring for 3h For ion exchange, keep stirring at a temperature of 80° C. and add the copper solution prepared in step (1) with continuous stirring for 4 hours.

[0035] (3) Pulping: the ion-exchanged solution in step (2) is cooled to room temperature, 28 g of silicon solution with a concentration of 30% is added, stirred, ball milled, and left to stand for 1 hour to obtain a slurry;

[0036] (4) Coating and roasting: Coat the slurry prepared in step (3) on the cordierite carrier, the coating amount is 140g / L, dry quickly at 130°C with a dryer, and then b...

Embodiment 2

[0039] (1) Configuration of copper solution: Heat 100g of deionized water to 80°C, add 20.30g of copper acetate, 8.60g of citric acid and water, stir and dissolve at 80°C, and prepare a copper solution.

[0040] (2) Ion exchange: Heat 220g of deionized water to 80°C, add 3.88g of yttrium nitrate hexahydrate and stir to dissolve completely, keep the temperature at 80°C and add H-SSZ-13 with a silicon-aluminum ratio of 16 and 180g of H-SSZ-13 and keep stirring for 1h for ion exchange Exchange, keep stirring at 70°C and add the copper solution prepared in step (1), and keep stirring for 3h.

[0041] (3) Pulping: the ion-exchanged solution in step (2) was cooled to room temperature, 36 g of a silicon solution with a concentration of 30% was added, stirred, ball milled, and left to stand for 1 hour to obtain a slurry;

[0042] (4) Coating and roasting: coat the slurry prepared in step (3) on the cordierite carrier, the coating amount is 140g / L, dry quickly at 130°C with a drier, an...

Embodiment 3

[0044] (1) Preparation of copper solution: Heat 55g of deionized water to 70°C, add 21.88g of copper sulfate pentahydrate and 7.88g of glycine, stir and dissolve, and prepare a copper solution.

[0045] (2) Ion exchange: Heat 300g of deionized water to 70°C, add 8.62g of yttrium nitrate hexahydrate and stir to dissolve completely, keep the temperature at 70°C and add 200g of H-SSZ-13 with a silicon-aluminum ratio of 20 and keep stirring for 6 hours For ion exchange, keep stirring at a temperature of 80° C. and add the copper solution prepared in step (1) with continuous stirring for 4 hours.

[0046] (3) Pulping: the ion-exchanged solution in step (2) was cooled to room temperature, 57 g of zirconium sol with a concentration of 21% was added, stirred, ball milled, and left standing for 2 hours to obtain a slurry;

[0047] (4) Coating and roasting: Coat the slurry prepared in step (3) on the cordierite carrier, the coating amount is 140g / L, dry quickly at 120°C with a drier, an...

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

The invention discloses a molecular sieve SCR catalyst and a preparation method thereof. The preparation method comprises the following steps of: (1) heating deionized water to 60-90 DEG C, and adding and dissolving soluble copper salt and an additive to obtain a copper solution; (2) heating deionized water to 60-90 DEG C, adding and dissolving soluble yttrium salt, adding a molecular sieve with a silica-alumina ratio of less than or equal to 24 while keeping the temperature, and stirring for 0.5-5 hours; and adding a copper solution while keeping the temperature, and stirring for 1-10 hours; (3) cooling the solution subjected to ion exchange in the step (2), adding an adhesive, stirring, carrying out ball milling, and standing for 0.5-5 hours to obtain slurry; and (4) coating a carrier with the slurry, drying, and roasting for 1-6 hours in air at 300-600 DEG C to obtain the molecular sieve SCR catalyst. According to the invention, a small-pore molecular sieve material with a low silica-alumina ratio is adopted, and the second active component yttrium is added, so that the prepared catalyst shows excellent catalytic activity on NOx at low temperature and high temperature, and has a wide active temperature window, high hydrothermal stability and good hydrocarbon resistance.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a molecular sieve SCR catalyst and a preparation method. Background technique [0002] Atmospheric nitrogen oxides (NO x , NO+NO 2 ) is one of the main pollutants, and it is an important culprit that causes bad weather such as acid rain, photochemical smog, and smog. It directly threatens the ecological environment and causes serious harm to human health, and its most direct and main source is fossil fuels. combustion; with the continuous development of the automobile industry, the number of various types of motor vehicles has increased sharply, and the tail gas emitted by engine fuel consumption contains NO x , which is also an important cause of serious air pollution, so the NO in motor vehicle exhaust x Catalytic purification has attracted widespread attention all over the world, especially for diesel vehicles such as NO x Big emitters are even more concerned....

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 Applications(China)
IPC IPC(8): B01J29/76B01J37/30B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01J29/76B01J37/30B01J37/0215B01J37/082B01D53/8628B01J2229/183Y02A50/20
Inventor 冯锡刘志敏孙睿张艳华王瑞芳魏宽陈海昆陈耀强王云李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap