Method for directly synthesizing Cu-doped zeolite CHA by taking cheap Si and Al as raw materials

A technology of silicon-alumina and raw materials, which is applied in the field of directly synthesizing Cu-doped zeolite CHA from cheap silicon-alumina raw materials, can solve the problems of high price of amantadine, long synthesis cycle, and limited application, so as to alleviate secondary environmental problems and avoid Ion exchange step, effect of reducing production cost

Inactive Publication Date: 2016-08-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the hydrothermal synthesis using Adamantaneamine (Adamantaneamine) as a template is a classic method for preparing zeolite CHA, but due to the high price and toxicity of amantadineamine, the application of this method is greatly limited; US2007032692-A1 disclosed " Conversion of hydrocarbonaceous feed to produce n-paraffin products comprises contacting feed under specific temperature, pressure, and liquid hourly space velocity with borosilicate or aluminaborosilicate molecular sieve" introduced a method of converting Y-type zeolite into zeolite CHA, but it needs to use Zeolite crystal seeds and long synthesis cycle; CN103771440A discloses "method for directly synthesizing Cu-containing zeolite with CHA structure" directly prepares Cu-doped zeolite CHA, but structure directing agent is also used in the process, which increases the cost
It can be found that there are few reports on the direct synthesis of Cu-doped zeolite CHA. After the existing zeolite CHA is synthesized, multiple ion exchanges are required to obtain Cu-doped products, which not only complicates the process, but also reduces the economy

Method used

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  • Method for directly synthesizing Cu-doped zeolite CHA by taking cheap Si and Al as raw materials
  • Method for directly synthesizing Cu-doped zeolite CHA by taking cheap Si and Al as raw materials

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Weigh 1.20 g of silica powder and 3.75 g of alumina powder (silicon to aluminum molar ratio 2:1), mix with 10.87 g of copper nitrate powder; add 15.82 g of potassium hydroxide powder and mix evenly. The mixture was transferred to a high-temperature furnace, calcined at 650 °C for 1 h in an air atmosphere, and ground into powder after cooling to room temperature. Take an appropriate amount of the above powder, dissolve it in ultrapure water at a solid-to-liquid mass ratio of 4:1, stir for 30 minutes, let it stand for 60 minutes, transfer it to a high-pressure reactor and seal it, and conduct a hydrothermal reaction in a constant temperature drying oven at 95°C for 4 sky. The hydrothermal reaction product was washed 5 times with ultrapure water, filtered, and dried at 100 °C for 12 h to obtain the product.

[0022] figure 2 SEM image of Cu-doped zeolite CHA. It can be seen from the figure that the crystal size of the product is uniform, uniformly dispersed, and has a ...

Embodiment 2

[0024] Weigh 1.20 g of quartz sand, crush and sieve with a pulverizer, mix 200-mesh powder with 4.0 g of alumina powder and 12.0 g of copper chloride powder, and then add 16.0 g of pulverized potassium hydroxide powder. The mixture was calcined at 650°C for 2 h to fully react the molten potassium hydroxide with other raw materials, and then ground after cooling. Take an appropriate amount of the above powder, dissolve it in ultrapure water at a solid-to-liquid mass ratio of 5:1, stir for 50 min, let it stand for 60 min, transfer it to a high-pressure reactor and seal it, and conduct a hydrothermal reaction at 100 °C for 3 days. The hydrothermal reaction product was repeatedly washed, filtered and dried at 100°C for 12 h to obtain a powder product.

Embodiment 3

[0026] Weigh 5.0 g of fly ash (silicon-aluminum molar ratio 1:1), mix with 10.0 g of copper nitrate powder; then add 8.0 g of sodium hydroxide powder and mix evenly. The mixture was transferred to a high-temperature furnace, calcined at 600 °C for 1 h in an air atmosphere, and ground into powder after cooling to room temperature. Take an appropriate amount of the above powder, dissolve it in tap water at a solid-to-liquid mass ratio of 6:1, stir for 30 min, let it stand for 90 min, transfer it to a high-pressure reactor and seal it, and conduct a hydrothermal reaction in a constant temperature drying oven at 95°C for 6 days. The hydrothermal reaction product was washed repeatedly, filtered and dried at 100 °C for 12 h to obtain the Cu-doped zeolite CHA product.

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PUM

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Abstract

The invention provides a method for directly synthesizing Cu-doped zeolite. The method comprises the following steps of: utilizing cheap Si and Al raw materials, adding a Cu source during initial burdening, and directly synthesizing Cu-doped zeolite CHA by carrying out steps of high temperature alkali melting and hydrothermal reaction, wherein the obtained product is uniform in size and well-crystallized. The method provided by the invention has the advantages that a tedious ion exchange step in an existing method is eliminated, an organic template or zeolite seed crystal is not used, and industrial solid waste is fully utilized, so that technology is simplified, cost is reduced, economic benefit and environmental benefit of waste utilization are also added, and green development of the industry is facilitated.

Description

technical field [0001] The invention relates to the field of metal-nonmetal composite materials, in particular to a method for directly synthesizing Cu-doped zeolite CHA with cheap silicon-aluminum raw materials. Background technique [0002] Cu-doped zeolite CHA is a composite material with broad application prospects, especially in selective catalytic reduction (SCR), it is expected to be used as an important denitrification catalyst to treat automobile exhaust and reduce NO x emission. [0003] Traditional Cu-doped zeolite CHA mostly passes through zeolite CHA products and Cu-containing 2+ Obtained indirectly after solution ion exchange. Among them, the hydrothermal synthesis using Adamantaneamine (Adamantaneamine) as a template is a classic method for preparing zeolite CHA, but due to the high price and toxicity of amantadineamine, the application of this method is greatly limited; US2007032692-A1 disclosed " Conversion of hydrocarbonaceous feed to produce n-paraffin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B22F9/20
CPCC01B39/02B22F9/20C01P2004/03
Inventor 杜涛刘丽影房鑫王义松宋延丽张斌未艺超孟达
Owner NORTHEASTERN UNIV
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