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Metal composite molecular sieve material for adsorption-catalytic oxidation of VOCs and preparation method and application thereof

A composite molecular sieve and metal composite technology, applied in catalyst activation/preparation, separation methods, molecular sieve catalysts, etc., can solve the problems of high investment, operation and maintenance costs, high price, and narrow exhaust gas temperature range.

Active Publication Date: 2021-04-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has the disadvantages of large floor area, high investment, operation and maintenance costs, and the zeolite adsorbent can treat the waste gas in a narrow temperature range (20-35°C), and the commercial Pt-based catalyst used is expensive, and the commercial Mn-based catalyst is expensive. Catalytic oxidation performance is low, etc.

Method used

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  • Metal composite molecular sieve material for adsorption-catalytic oxidation of VOCs and preparation method and application thereof
  • Metal composite molecular sieve material for adsorption-catalytic oxidation of VOCs and preparation method and application thereof
  • Metal composite molecular sieve material for adsorption-catalytic oxidation of VOCs and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of Beta molecular sieve:

[0043] Slowly add 22mL of tetraethylammonium hydroxide into 25mL of ethyl orthosilicate, heat and stir in a constant temperature magnetic stirrer at 60°C for 2h, then add 0.23g of sodium metaaluminate dissolved in water dropwise to form a mixed The solution was stirred at room temperature for 3 hours, then transferred to the liner of the polytetrafluoroethylene reactor, and finally put the liner of the polytetrafluoroethylene reactor into the autoclave, and reacted hydrothermally at 140°C for 3 days, and then cooled naturally. Centrifugal washing with deionized water for 5 times, vacuum freeze-drying at -30°C, and finally calcining in a muffle furnace at 550°C for 5 hours to obtain Beta molecular sieves.

Embodiment 2

[0045] Preparation of CuOx / Beta molecular sieve:

[0046] 0.22g copper acetate (Cu 2 (CH 3 COO) 4 ) mixed with 20mL of deionized water, placed in a constant temperature magnetic stirrer at 60°C and a stirring rate of 450r / min for 10 min to dissolve, add 1g of Beta molecular sieve under stirring, stir until dry, transfer to - Freeze-dry in a vacuum freeze dryer at 25°C for 24 hours, after being ground, place it in a muffle furnace for high-temperature calcination. 4h, then lowered to room temperature at a rate of 3°C / min to obtain CuOx / Beta molecular sieves.

Embodiment 3

[0048] Preparation of Pt / Beta molecular sieve:

[0049] Add 4g of Beta molecular sieve carrier into 40mL of deionized water with nitrogen gas, continuously stir vigorously at constant temperature, add 5.23mL of chloroplatinic acid solution dropwise, continue to add 5mL of methanol and 5mL of ethanol, and use a xenon lamp (Perfect light, PLS-SXE300 / 300UV) As a light source, the light intensity is 350mW / cm 2 , irradiated for 10 h under continuous stirring, centrifuged 5 times in a centrifuge with a rotating speed of 6500 r / min, and put into a vacuum freeze dryer at -25 ° C for 24 h to obtain a Pt / Beta molecular sieve catalyst prepared by photodeposition.

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PUM

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Abstract

The invention discloses a metal composite molecular sieve material for adsorption-catalytic oxidation of VOCs and a preparation method and application thereof. The method comprises the following steps: dissolving a molecular sieve in water, and dipping or photodepositing a metal precursor on the molecular sieve to prepare the metal composite molecular sieve material for adsorption-catalytic oxidation of VOCs. The prepared material can efficiently adsorb, capture and concentrate VOCs in waste gas, captured organic matter is catalytically oxidized into H2O and CO2 at the metal active center position, adsorption-catalytic oxidation integration is achieved, and thus the purpose of degrading low-concentration VOCs in waste gas is achieved. Compared with an existing VOCs purification material, the material has the advantages of high adsorption performance, high activity, high selectivity and the like. The prepared material can be widely applied to the field of atmospheric pollution control of industrial conventional organic waste gas, industrial organic waste gas containing NO, NH3 and SO2, organic waste gas in coal-fired flue gas and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials, and in particular relates to a preparation method of a metal composite molecular sieve material used for adsorption-catalytic oxidation of VOCs and its application in atmospheric environmental pollution control. Background technique [0002] VOCs are an important class of air pollutants, and their sources mainly include man-made sources and natural sources. Due to the uncontrollable characteristics of natural sources, we pay more attention to the emissions from man-made sources, among which the emissions from industrial sources account for the total emissions from man-made sources. More than 70% of , and may also be accompanied by NH 3 , NO, SO 2 and other pollutants. There are complex types of VOCs, which participate in the formation of ozone and photochemical smog in the atmospheric environment, which will cause serious air pollution. At the same time, most VOCs hav...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/44B01D53/88B01J20/18B01J29/76B01J29/74B01J35/04B01J37/32B01J37/10B01J37/08B01J37/02B01J37/34B01J37/00C01B39/02
CPCB01D53/8687B01D53/88B01D53/007B01J20/18B01J29/7615B01J29/7415B01J37/32B01J37/10B01J37/082B01J37/0201B01J37/0203B01J37/088B01J37/344B01J37/0018C01B39/02B01D2255/802B01D2257/708B01D2257/302B01D2257/406B01D2257/404B01D2258/0283B01J2229/186B01J35/56Y02C20/40Y02A50/20
Inventor 胡芸杜玥莹肖高飞李剑晗付名利
Owner SOUTH CHINA UNIV OF TECH
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