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Preparation method and application of Co-Mn-MCM-41 molecular sieve

A technology of co-mn-mcm-41 and molecular sieve, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, water pollutants, etc., can solve the problems of time-consuming, cumbersome operation, easy to block channels, etc., to shorten the reaction time, catalyze The effect of high activity and large specific surface area

Inactive Publication Date: 2016-03-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface modification has the disadvantage that the introduced active centers are not easy to disperse uniformly, and it is easy to block the pores, resulting in the possibility of collapse of the ordered mesoporous channels, and the material preparation process takes a long time and the operation is relatively cumbersome.

Method used

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  • Preparation method and application of Co-Mn-MCM-41 molecular sieve
  • Preparation method and application of Co-Mn-MCM-41 molecular sieve
  • Preparation method and application of Co-Mn-MCM-41 molecular sieve

Examples

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Effect test

Embodiment 1

[0030] A kind of Co-Mn-MCM-41 molecular sieve, its raw material is as follows: 28.42gNa 2 SiO 3 9H 2 O, 0.243g cobalt nitrate, 0.204g manganese acetate, 7.28g CTAB, 100mL deionized water.

[0031] Its preparation method comprises the following steps:

[0032] 1) Na 2 SiO 3 9H 2 O was dissolved in 65ml deionized water, stirred to dissolve;

[0033] 2) Dissolve cobalt nitrate and manganese acetate in 10ml deionized water and add to the above solution, continue to stir for 15min, add dropwise 2mol L -1 Sulfuric acid solution until a sol appears, and continue to stir for 30 minutes;

[0034] 3) Dissolve CTAB in the remaining deionized water, add to the above solution and stir for 30 minutes, adjust the pH=10.5-11 to obtain the mixture;

[0035] 4) The mixture was crystallized at 145°C for 48h, cooled to room temperature, filtered and washed, and the washed crystalline product was dried at 80°C under vacuum, flattened, calcined in a muffle furnace at 550°C for 5h, and groun...

Embodiment 2

[0037] A kind of Co-Mn-MCM-41 molecular sieve, its raw material is as follows: 0.1molNa 2 SiO 3 9H 2 O, 0.182g cobalt nitrate, 0.153g manganese acetate, 7.28g CTAB, 100mL deionized water.

[0038] Its preparation method comprises the following steps:

[0039] 1) Na 2 SiO 3 9H 2 O was dissolved in 65ml deionized water, stirred and dissolved under a mechanical stirrer;

[0040] 2) Dissolve cobalt nitrate and manganese acetate in 10ml deionized water and add to the above solution, continue to stir for 15min, add dropwise 2mol L -1 Continue to stir the sulfuric acid solution for 30 minutes until the sol appears;

[0041] 3) Dissolve CTAB in 25ml of deionized water, add to the above solution and stir for 30min, adjust the pH=10.5~11 to obtain the mixture;

[0042] 4) The mixture was crystallized at 145°C for 48h, cooled to room temperature, filtered and washed, and the washed crystalline product was dried at 80°C under vacuum, flattened, calcined in a muffle furnace at 550°...

Embodiment 3

[0044] A kind of Co-Mn-MCM-41 molecular sieve, its raw material is as follows: 0.1molNa 2 SiO 3 9H 2 O, 1.25mmol cobalt nitrate, 1.25mmol manganese acetate, 0.01mol CTAB, 108mL deionized water.

[0045] Its preparation method comprises the following steps:

[0046] 1) Na 2 SiO 3 9H 2 O was dissolved in 65ml deionized water, stirred to dissolve;

[0047] 2) Dissolve cobalt nitrate and manganese acetate in 20ml deionized water and add to the above solution, continue to stir for 15min, add dropwise 2mol L -1 Sulfuric acid solution until a sol appears, and continue to stir for 25 minutes;

[0048]3) Dissolve CTAB in the remaining deionized water, add to the above solution and stir for 30 minutes, adjust the pH=10.5-11 to obtain the mixture;

[0049] 4) The mixture was crystallized at 135°C for 55h, cooled to room temperature, filtered and washed, and the washed crystalline product was dried at 80°C under vacuum, flattened, calcined in a muffle furnace at 650°C for 5h, and ...

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Abstract

The invention discloses a preparation method of a Co-Mn-MCM-41 molecular sieve. The preparation method comprises the following steps: dissolving sodium silicate used as a silicon source, cobalt salt used as a cobalt source, manganese salt used as a manganese source and a cationic surface active agent used as a template agent in water so as to form a mixture; and crystallizing under a strong alkaline condition, separating, washing and drying a crystallized product, then calcining the crystallized product so as to remove the template agent, thereby obtaining the Co-Mn-MCM-41 molecular sieve. The molecular sieve provided by the invention has a highly ordered one-dimensional hexagonal mesopore structure, and is large in specific surface area and high in catalysis activity; and results of an experiment of removing oxalic acid by ozonation catalysis indicate that through 15-minute catalysis based on the molecular sieve, the oxalic acid removal rate can be up to 97% and is 24 times that of ozonation under a catalyst-free condition.

Description

technical field [0001] The invention relates to a preparation method of Co-Mn-MCM-41 molecular sieve, and also relates to its application as a heterogeneous ozone oxidation catalyst. Background technique [0002] With the increasingly serious problem of water pollution and the further improvement of effluent quality requirements, conventional water treatment technology has become unable to remove micro-polluting organic matter. Although ozone oxidation technology can degrade many organic substances and improve their biodegradation performance in conventional water treatment processes, there are problems such as high selectivity to pollutant degradation, low utilization rate, and incomplete mineralization in practical applications. In order to solve these problems, a new type of advanced oxidation technology - heterogeneous catalytic ozonation technology has been developed in the past 20 years. This technology can oxidize those organic pollutants that are difficult to be oxid...

Claims

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Application Information

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IPC IPC(8): B01J29/03C02F1/78C02F101/34
CPCB01J29/0341B01J2229/18C02F1/78C02F2101/34
Inventor 李来胜潘兆琪卢平张秋云李旭凯
Owner SOUTH CHINA NORMAL UNIVERSITY
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