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A kind of preparation method of MN-CE/SBA-15 mesoporous molecular sieve catalyst comprising active coating

A mesoporous molecular sieve and active coating technology, applied in the field of denitrification, can solve the problems of irreversible deactivation, catalyst inability to recover activity, catalyst deactivation, etc., and achieve the effects of promoting adsorption and activation, inhibiting catalyst surface formation, and improving low-temperature activity

Active Publication Date: 2022-03-22
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The other is catalyst pair H 2 O is chemisorbed, and decomposed to produce hydroxyl groups leading to catalyst deactivation, removal of H 2 After O, the catalyst cannot recover its activity, which belongs to irreversible deactivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method comprising the Mn-Ce / SBA-15 mesoporous molecular sieve catalyst of active coating, comprises the following steps:

[0028] (1), the preparation of SBA-15 mesoporous molecular sieve: with nonionic surfactant P123 as structure directing agent, tetraethyl orthosilicate as silicon source, according to TEOS:P123:HCl:H2O=1:0.017:5.88: The molar ratio of 150 is fed, and it is made by hydrothermal synthesis.

[0029] The specific preparation method of SBA-15 mesoporous molecular sieve is:

[0030] First, 4g P123, 8.9g of 37% HCl and 108.9g of H2O were mixed and dissolved, and stirred rapidly at 40-45°C for 3-3.5h, then 8.4g of TEOS was added to the above mixed solution, at 40-45 Stir rapidly at ℃ for 12-13h to obtain a milky white suspension; transfer the milky white suspension to a high-pressure hydrothermal reactor with a polytetrafluoroethylene liner, let it stand at 100-110℃ for 20-24h, and then filter Wash the filter residue with deionized wa...

Embodiment 2

[0036] A kind of preparation method comprising the Mn-Ce / SBA-15 mesoporous molecular sieve catalyst of active coating, comprises the following steps:

[0037] (1), preparation of SBA-15 mesoporous molecular sieve: same as Example 1.

[0038] (2), the preparation of Mn-Ce / SBA-15 mesoporous molecular sieve: 2.4g manganese nitrate, 2.1g cerium nitrate hexahydrate, 93g water and 132g deionized water are added in the beaker and stirred to make manganese nitrate and cerium nitrate hexahydrate completely Dissolve, then add 3g of SBA-15 mesoporous molecular sieve in step (1) to the beaker and stir evenly; then put the beaker into a heat-collecting constant temperature heating magnetic stirrer, heat the mixture in the beaker to 70°C and stir until it evaporates to dryness , put the obtained sample in an oven at 83°C for 13h, put it in a muffle furnace at 300°C for 4h, take it out and cool it in the air, and grind it to get 30-mesh Mn-Ce / SBA-15 media. Molecular sieve.

[0039] (3), th...

Embodiment 3

[0043] A kind of preparation method comprising the Mn-Ce / SBA-15 mesoporous molecular sieve catalyst of active coating, comprises the following steps:

[0044] (1), preparation of SBA-15 mesoporous molecular sieve: same as Example 1.

[0045] (2), preparation of Mn-Ce / SBA-15 mesoporous molecular sieve: add 3g manganese nitrate, 2.4g cerium nitrate hexahydrate, 105g water and deionized water to 165g in the beaker and stir to make manganese nitrate and cerium nitrate hexahydrate dissolve completely , then add 3g of the SBA-15 mesoporous molecular sieve of step (1) into the beaker and stir evenly; then put the beaker into a heat-collecting constant temperature heating magnetic stirrer, heat the mixture in the beaker to 80°C and stir until it evaporates to dryness, Finally, the obtained sample was dried in an oven at 85°C for 14 hours, then baked in a muffle furnace at 300°C for 5 hours, then taken out to cool in the air, and then ground and screened to obtain 40-mesh Mn-Ce / SBA-15 ...

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Abstract

The invention relates to the technical field of denitrification, in particular to a method for preparing a Mn-Ce / SBA-15 mesoporous molecular sieve catalyst comprising an active coating, including the preparation of SBA-15 mesoporous molecular sieves, the preparation of Mn-Ce / SBA-15 mesoporous Preparation of molecular sieves, preparation of catalyst precursors and preparation of finished catalysts. The catalyst has strong catalytic performance, high denitrification efficiency at medium and low temperatures, wide active temperature window, and is resistant to H 2 O poisoning performance and anti-SO 2 Strong poisoning performance, less susceptible to SO in flue gas 2 influence and reduce catalyst life.

Description

【Technical field】 [0001] The invention relates to the technical field of denitrification, in particular to a preparation method of a Mn-Ce / SBA-15 mesoporous molecular sieve catalyst containing an active coating. 【Background technique】 [0002] Nitrogen oxides (NOx) are one of the main pollutants in the atmospheric environment, which are harmful to human health and the ecological environment. NOx comes from the flue gas produced by fuel combustion, among which NO is the main one, accounting for more than 90% of the total NOx. In the atmosphere, NO is oxidized to NO 2 , while NO 2 Under the condition of ultraviolet radiation, it reacts with CHx in the flue gas to form a photochemical smog, which is 4-5 times more toxic than NO, and is extremely harmful to most organs of the human body as well as animals and plants. At present, the denitrification technology for industrial application is mainly based on NH 3 Selective Catalytic Reduction (SCR) denitrification technology as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/04B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J29/045B01J35/0066B01J35/1004B01D2258/0283
Inventor 刘来君周硕何霞凤郑贤德
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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