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Molecular sieve SCR catalyst and preparation method thereof

A technology of SCR catalyst and molecular sieve, which is applied in the field of molecular sieve SCR catalyst and its preparation, can solve the problems of low conversion rate, prone to hydrocarbon poisoning, high temperature performance degradation, etc., and achieve cost reduction, high hydrothermal stability, and wide activity temperature window Effect

Active Publication Date: 2021-10-26
SINOCAT ENVIRONMENTAL TECH
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  • 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

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  • 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
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Effect test

Embodiment 1

[0035] (1) Configuration of copper solution: heat 50 g of deionized water to 60° C., add 19.03 g of copper nitrate trihydrate and 6.05 g of citric acid, and stir to dissolve to prepare a copper solution.

[0036] (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-to-aluminum ratio of 13, and keep stirring for 3h. For ion exchange, the copper solution prepared in step (1) was added with continuous stirring at a temperature of 80° C., and the solution was continuously stirred for 4 h.

[0037] (3) pulping: the solution after ion exchange in step (2) is lowered to room temperature, 28 g of silicon solution with a concentration of 30% is added, stirred, ball-milled, and allowed to stand for 1 hour to obtain a slurry;

[0038] (4) Coating and roasting: the slurry prepared in step (3) is coated on the cordierite carrier with a coating amoun...

Embodiment 2

[0041] (1) Configuration of copper solution: heat 100 g of deionized water to 80 °C, add 20.30 g of copper acetate, 8.60 g of citric acid and water, and stir and dissolve at 80 °C to prepare a copper solution.

[0042] (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, add 16 and 180g H-SSZ-13 with a silicon-to-aluminum ratio and keep stirring for 1h. For ion exchange, the copper solution prepared in step (1) was added with continuous stirring at a temperature of 70° C., and was continuously stirred for 3 h.

[0043] (3) pulping: the solution after ion exchange in step (2) is lowered to room temperature, 36 g of silicon solution with a concentration of 30% is added, stirred, ball-milled, and allowed to stand for 1 hour to obtain a slurry;

[0044] (4) Coating and roasting: coating the slurry prepared in step (3) on the cordierite carrier with a coating amount of 140 g / L...

Embodiment 3

[0046] (1) Configuration of copper solution: heat 55 g of deionized water to 70° C., add 21.88 g of copper sulfate pentahydrate and 7.88 g of glycine, and stir to dissolve to prepare a copper solution.

[0047] (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, add 20 and 200g H-SSZ-13 with a silicon-aluminum ratio and keep stirring for 6h. For ion exchange, the copper solution prepared in step (1) was added with continuous stirring at a temperature of 80° C., and the solution was continuously stirred for 4 h.

[0048] (3) pulping: the solution after the ion exchange in step (2) is lowered to room temperature, 57 g of zirconium sol with a concentration of 21% is added, stirred, ball-milled, and allowed to stand for 2 hours to obtain a slurry;

[0049] (4) coating and roasting: the slurry prepared in step (3) is coated on the cordierite carrier, the coating amount is 140...

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Abstract

The invention discloses a molecular sieve SCR catalyst and a preparation method thereof, and the preparation method comprises the following steps: (1) heating deionized water to 20-90 DEG C, adding soluble copper salt and an additive, and dissolving to prepare a copper solution; (2) heating deionized water to 20-90 DEG C, adding soluble yttrium salt for dissolving, adding a molecular sieve with a silica-alumina ratio of less than or equal to 24 while keeping the temperature, and stirring; adding a copper solution while keeping the temperature, and stirring for ion exchange; (3) cooling the solution subjected to ion exchange in the step (2), adding an adhesive, stirring, ball-milling and standing to obtain slurry; and (4) coating a carrier with the slurry, drying and roasting 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 an important culprit in causing acid rain, photochemical smog and smog and other bad weather, directly threatening the ecological environment and causing serious harm to human health, and the most direct and main source of it is fossil fuels With the continuous development of the automobile industry, the number of various types of motor vehicles has increased sharply, and the exhaust gas emitted by engine fuel consumption contains NO x , which is also an important cause of serious air pollution, so NO in motor vehicle exhaust x Catalytic purification has attracted worldwide attention, especially for NO such as diesel vehicles x Big emitters are even more concerned. The emission of diesel heavy-duty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/30B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01J29/76B01J37/30B01J37/0215B01J37/082B01D53/8628B01J2229/183Y02A50/20
Inventor 冯锡刘志敏孙睿王云张艳华王瑞芳魏宽陈海昆赖益能陈耀强李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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