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Copper-based molecular sieve catalyst and preparation method thereof

A molecular sieve and catalyst technology, applied in the field of copper-based molecular sieve catalyst and its preparation, can solve the problems of water resistance and sulfur resistance without a reaction temperature window

Active Publication Date: 2012-05-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, under the conditions of no sulfur, no dust, and no water, many catalysts exhibit excellent NOx purification capabilities, but most of them do not have a wide reaction temperature window and excellent resistance to water and sulfur

Method used

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  • Copper-based molecular sieve catalyst and preparation method thereof
  • Copper-based molecular sieve catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment includes the following steps:

[0022] Step 1, prepare copper-based molecular sieve catalyst by ion exchange method, prepare 0.010mol / L copper acetate solution, and configure 0.005mol / L cerium ammonium nitrate solution at the same time, add the above-mentioned two solutions of copper and cerium into the reactor by pressing The volume ratio is 1:1 and mixed evenly;

[0023] Step 2, adding molecular sieve carrier ZSM-5 to the mixed solution, stirring at 30°C for 12 hours at a stirring speed of 200r / min, wherein the mass ratio of copper to molecular sieve carrier ZSM-5 in the copper solution is 6.4%;

[0024] Step 3. The solution obtained in step 2 is filtered by a vacuum pump and washed to remove impurity ions. The white viscous substance obtained is dried at 115°C, then roasted at 600°C for 2 hours, and finally pressed into tablets at 10Mpa and sieved with 40 meshes. A copper-based molecular sieve catalyst is obtained.

[0025] The copper-based molecula...

Embodiment 2

[0033] This embodiment includes the following steps:

[0034] Step 1. Prepare copper-based molecular sieve catalyst by ion exchange method, prepare 0.005mol / L copper acetate solution, and configure 0.005mol / L cerium ammonium nitrate solution at the same time, add the above-mentioned two solutions of copper and cerium into the reactor by pressing The volume ratio is 1:1 and mixed evenly;

[0035] Step 2, adding molecular sieve carrier ZSM-5 to the mixed solution, stirring at 28°C for 18 hours at a stirring speed of 350r / min, wherein the mass ratio of copper to molecular sieve carrier ZSM-5 in the copper solution is 3.2%;

[0036] Step 3. The solution obtained in step 2 is filtered by a vacuum pump and washed to remove impurity ions. The obtained white viscous substance is dried at 110°C, then roasted at 500°C for 4 hours, and finally pressed into tablets with 10Mpa pressure and sieved with 40 meshes. A copper-based molecular sieve catalyst is obtained.

[0037] The copper-bas...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1, prepare copper-based molecular sieve catalyst by ion exchange method, prepare 0.015mol / L copper acetate solution, and configure 0.005mol / L cerium ammonium nitrate solution at the same time, add the above-mentioned two solutions of copper and cerium into the reactor by pressing The volume ratio is 1:1 and mixed evenly;

[0041] Step 2, adding molecular sieve carrier ZSM-5 to the mixed solution, stirring at 25°C for 24 hours at a stirring speed of 200r / min, wherein the mass ratio of copper to molecular sieve carrier ZSM-5 in the copper solution is 9.6%;

[0042] Step 3. The solution obtained in step 2 is filtered by a vacuum pump and washed to remove impurity ions. The white viscous substance obtained is dried at 110°C, and then roasted at 400°C for 6 hours. Finally, it is pressed into tablets with a pressure of 10Mpa and sieved through a 40-mesh sieve. A copper-based molecular sieve catalyst is obtained.

...

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Abstract

The invention relates to a copper-based molecular sieve catalyst and a preparation method thereof. The preparation method comprises the steps of: first, preparing a mixture of copper acetate and cerous nitrate; second, adding a molecular sieve carrier ZSM-5 in the mixture and stirring; and finally, drying and roasting to obtain the copper-based molecular sieve catalyst. The obtained copper-based molecular sieve catalyst has a molecular formula of Cu-Ce-ZSM-5, copper accounts for 3-12% of the total weight of the catalyst, cerium accounts for 5-8% of the total weight of the catalyst, and ZSM-5 accounts for 80-92% of the total weight of the catalyst. The catalyst is extremely efficient to a NH3-SCR reaction at a temperature between 200 DEG C and 500 DEG C, has excellent water and sulfur resistance and stability, can fit strict laws and regulations on emission, and achieves the purposes of reducing the cost and increasing safety.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a copper-based molecular sieve catalyst and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy and the continuous growth of energy consumption, coal, oil, and gas-based energy consumption consume a large amount of fossil fuels, and the hazards such as nitrogen oxides (NOx) emitted into the atmosphere continue to intensify. At present, the air pollution in some big cities in my country has shown regional complex characteristics, and effective control of NOx emissions has become an important means to alleviate the current situation of complex pollution. NOx emissions from urban diesel vehicles and lean-burn vehicles are one of the main sources of urban pollution, so effective control of NOx emissions from such mobile sources is an important part of regional compound pollution control. [0003] At present, selective cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01D53/86B01D53/56
Inventor 李俊华马磊李东玲傅立新
Owner TSINGHUA UNIV
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