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Preparation method of La modified Cu-SSZ-13 molecular sieve

A cu-ssz-13, molecular sieve technology, applied in separation methods, molecular sieve catalysts, molecular sieves and alkali exchange compounds, etc., can solve the problems of low NO conversion rate, excessive NO conversion rate drop, etc., and achieve good N2 selectivity. Effect

Pending Publication Date: 2020-08-07
济南工程职业技术学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method improves on existing methods used for reducing nitrogen oxide (NO) emissions from diesel engines that use copper zeolite or other materials containing iron sulfides called FeS2O3. By modifying certain elements within this material instead of adding them during production, we can achieve better efficiency without compromising their effectiveness over time due to degraded properties caused by these metals. Additionally, our new approach involves replacing expensive rare earth metallic components like cerium into an aluminum framework structure made up mostly of silicon dioxane which makes the resulting crystal less costly while still maintaining high selective ability towards different types of gases such as oxygen gasoline vapor.

Problems solved by technology

The patent text discusses the use of selective catalytic reduction (SCR) technology for removing nitrogen oxides (NOx) from exhaust gases. The main focus is on the development of efficient and stable catalysts suitable for environments with high sulfur and dust levels. The text highlights the Cu-SSZ-13 molecular sieve catalyst as having outstanding performance in SCR, but mentions two main issues with its preparation method: high production cost and low NO conversion rates at low and high temperatures. Therefore, the technical problems addressed in the patent text are the high cost of catalyst production and the need for improved NO conversion rates across a wider temperature range.

Method used

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  • Preparation method of La modified Cu-SSZ-13 molecular sieve
  • Preparation method of La modified Cu-SSZ-13 molecular sieve
  • Preparation method of La modified Cu-SSZ-13 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1. Experimental steps

[0027] Silica sol (40%), copper sulfate, tetraethylenepentamine (TEPA), sodium metaaluminate and sodium hydroxide are used as silicon source, copper source, template agent, aluminum source and alkaline regulator respectively. Weigh 22-23gCuSO 4 ·5H 2 O add 113-114gH 2 O dissolves and completely dissolves into a dark blue transparent liquid. Add 7-8g NaAlO 2 After stirring for 0.5 hours, it turned into a sky blue mud. Then add 20-21g TEPA to turn dark blue, stir well. Continue to add 14-15g NaOH and stir for 0.5h, then add 67-68g of 40.06% silica sol, stir for 2h to obtain the initial aluminosilicate gel, the molar ratio of the prepared initial aluminosilicate gel is 5.0Na 2 O:1.0Al 2 o 3 :10SiO2 2 :200H 2 O: 2.0Cu-TEPA, put the aluminosilicate initial gel into the reaction kettle for crystallization at 140°C for 3 days. The crystallized product was washed with deionized water until the pH was neutral, and dried at 110°C for 8 hours to ...

Embodiment 2

[0033] 1. Experimental steps

[0034] Prepared Cu-SSZ-13, La in embodiment 1 0.015 -Cu-SSZ-13, La 0.025 -Cu-SSZ-13, La 0.10 -Cu-SSZ-13, La0.15-Cu-SSZ-13 respectively in the range of 150 ℃ -550 ℃, the space velocity is set to 150,000h-1 test conditions, La modified Cu-SSZ-13 and Cu - The "standard SCR" denitrification activity of SSZ-13 catalyst was investigated.

[0035] NH 3 Selective catalytic reduction of NO experiments were carried out in a miniature fixed-bed quartz reactor (i.d.=5 mm). The loading amount of the catalyst (20-40 mesh) is 80 mg, and the reaction pressure is 0.1 MPa. Intake composition is 500ppm NO, 500ppm NH 3 , 5.0%O 2 , and the balance gas nitrogen. The total gas flow rate is 100mL / min, which corresponds to a GHSV of 150000h-1. The NO gas at the outlet of the reactor was analyzed online with the KM.9106 integrated flue gas analyzer of KANE, UK. Data recording was carried out when the steady state was reached after 30 min of reaction.

[0036] 2...

Embodiment 3

[0040] 1. Experimental steps

[0041] Weigh 22-23gCuSO 4 ·5H 2 O add 113-114gH 2 O dissolves and completely dissolves into a dark blue transparent liquid. Add 7-8g NaAlO 2 After stirring for 0.5 hours, it turned into a sky blue mud. Then add 20-21g TEPA to turn dark blue, stir well. Continue to add 14-15g NaOH and stir for 0.5h, then add 67-68g of 40.06% silica sol, stir for 2h to obtain the initial aluminosilicate gel, the molar ratio of the prepared initial aluminosilicate gel is 5.0Na 2 O:1.0Al 2 o 3 :10SiO2 2 :200H 2 O: 2.0Cu-TEPA, put the aluminosilicate initial gel into the reaction kettle for crystallization at 140°C for 3 days. The crystallized product was washed with deionized water until the pH was neutral, and dried at 110°C for 8 hours to obtain an initial Cu-SSZ-13 molecular sieve sample. The prepared initial Cu-SSZ-13 molecular sieve samples were treated with 1mol / L NH 4 NO 3 Perform ion exchange for 6h (according to 1g Cu-SSZ-13 molecular sieve with...

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Abstract

The invention discloses a preparation method of a La modified Cu-SSZ-13 molecular sieve. The Cu-SSZ-13 molecular sieve catalyst is prepared by adopting a one-step method; then ion modification is performed on the prepared molecular sieve by using a lanthanum nitrate solution to obtain the La-modified Cu-SSZ-13 molecular sieve catalyst, wherein the catalytic performance of La (0.015-Cu-SSZ-13) is obviously improved compared with that of Cu-SSZ-13, and the catalyst has better N2 selectivity.

Description

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Claims

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Application Information

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Owner 济南工程职业技术学院
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