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Metal oxide-loaded molecular sieve catalyst and preparation method thereof

A technology for supporting metals and catalysts, applied in molecular sieve catalysts, physical/chemical process catalysts, separation methods, etc., can solve the problems of unsatisfactory purification effect and poor oxidation effect of ethanol-acetaldehyde, and achieve outstanding oxidation ability and ethanol-acetaldehyde. Excellent low temperature removal performance and low temperature activity

Active Publication Date: 2010-05-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a molecular sieve catalyst loaded with metal oxides and a preparation method thereof, which can solve the problem of the oxidation of ethanol acetaldehyde remaining in the tail gas of ethanol gasoline vehicles by existing exhaust catalytic converters. The technical problem of poor effect and unsatisfactory purification effect has the characteristics of high purification efficiency, low price and good thermal stability

Method used

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  • Metal oxide-loaded molecular sieve catalyst and preparation method thereof
  • Metal oxide-loaded molecular sieve catalyst and preparation method thereof
  • Metal oxide-loaded molecular sieve catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A metal oxide-loaded molecular sieve catalyst includes the following components:

[0025] Pure cryptomelane manganese dioxide is the active component, which accounts for 94% of the total mass of the catalyst. The doped transition metal Ce component accounts for 6% of the total mass of the catalyst. The active component passes through Mn 7+ And Mn 2+ The reaction produces, the molar ratio of the two is 0.72.

[0026] A method for preparing a metal oxide-loaded molecular sieve catalyst is prepared by a reflux method, and specifically includes the following steps:

[0027] 1. Prepare 280 mL of potassium permanganate solution with a concentration of 0.38mol / L, heat and stir at 56°C to form a solution;

[0028] 2. Prepare 288mL of 0.54mol / L manganese acetate solution, heat and stir at 58℃ to form a solution;

[0029] 3. Slowly add the solution obtained in step 1 to a 1000mL three-necked flask, heat it in an oil bath at 108°C for 10 minutes, stir with an electric stirrer at a stirring ...

Embodiment 2

[0038] An octahedral manganese oxide molecular sieve catalyst includes the following components:

[0039] Pure cryptomelane manganese dioxide is the active component, which accounts for 90% of the total mass of the catalyst. The doped transition metal Co component accounts for 10% of the total mass of the catalyst. The active component passes through Mn 7+ And Mn 2+ The reaction produced, the molar ratio of the two was 0.72.

[0040] A method for preparing a metal oxide-loaded molecular sieve catalyst is prepared by a reflux method, and specifically includes the following steps:

[0041] 1. Prepare 150 mL of potassium permanganate solution with a concentration of 0.30mol / L, heat and stir at 40°C to form a solution;

[0042] 2. Prepare 150mL of 0.45mol / L manganese acetate solution, heat and stir at 40℃ to form a solution;

[0043] 3. Slowly add the solution obtained in step 1 to a 1000mL three-necked flask, heat it in an oil bath at 80°C for 15 minutes, stir with an electric stirrer at a...

Embodiment 3

[0052] An octahedral manganese oxide molecular sieve catalyst includes the following components:

[0053] Pure cryptoknite manganese dioxide is the active component, which accounts for 95% of the total mass of the catalyst. The doped transition metal Cu component accounts for 5% of the total mass of the catalyst. The active component passes through Mn 7+ And Mn 2+ The reaction produced, the molar ratio of the two was 0.72.

[0054] A method for preparing a metal oxide-loaded molecular sieve catalyst is prepared by a reflux method, and specifically includes the following steps:

[0055] 1. Prepare 300mL of 0.40mol / L potassium permanganate solution, heat and stir at 60℃ to form a solution;

[0056] 2. Prepare 300mL of 0.55mol / L manganese acetate solution and heat and stir at 60℃ to form a solution;

[0057] 3. Slowly add the solution obtained in step 1 to a 1000mL three-necked flask, heat it in an oil bath at 110°C for 20 minutes, stir with an electric stirrer at a stirring speed of 450r / ...

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Abstract

A metal oxide-loaded molecular sieve catalyst comprises pure cryptomelane type manganese dioxide and transition metal. A method for preparing the molecular sieve catalyst comprises the following steps: 1, preparing solution of potassium permanganate; 2, preparing solution of manganese acetate; 3, adding the solution obtained by the step one into a three-neck flask, and heating, condensing and refluxing the solution; 4, adding the solution obtained by the step two into the three-neck flask of the step three, condensing and refluxing the solution, filtering and drying the obtained black pasty sediment, and roasting the sediment to obtain an octahedral manganese oxide molecular sieve catalyst (OMS-2) solid; 5, adding cerium ammonium nitrate, cobalt nitrate hexahydrate, copper nitrate trihydrate, ferric nitrate nonahydrate or yttrium nitrate into deionized water to form solution; and 6, mixing the solid taken from the step four and the solution in the step five, soaking cerium on the octahedral manganese oxide molecular sieve catalyst (OMS-2) solid, and drying and roasting the obtained solid to obtain the metal oxide-loaded molecular sieve catalyst. The metal oxide-loaded molecular sieve catalyst has the characteristics of high purification efficiency, low price and good thermal stability.

Description

Technical field [0001] The invention relates to the technical field of molecular sieve catalyst preparation, in particular to a molecular sieve catalyst supporting metal oxides and a preparation method thereof. Background technique [0002] With the development of industry and the improvement of people's living standards, the number of cars has risen sharply. The consumption of a large amount of petroleum resources by automobiles has aggravated the crisis of oil shortage. At the same time, the large amount of harmful gases contained in automobile exhaust caused serious pollution to the environment. In order to solve the two major problems of energy crisis and environmental pollution, it has become a trend to choose low-emission, resource-rich and easily available new fuels to replace gasoline. On February 10, 2004, the eight ministries and commissions summed up their past experience and jointly issued the <Expand the pilot program of ethanol gasoline for vehicles> with <...

Claims

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Application Information

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IPC IPC(8): B01J29/00B01D53/94B01D53/86B01D53/72
Inventor 李俊华王仁虎郝吉明
Owner TSINGHUA UNIV
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