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Molecular sieve catalyst as well as preparation method and application thereof
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A technology of molecular sieve and catalyst, which is applied in the field of molecular sieve catalyst and its preparation, can solve the problems that the efficiency of decomposing formaldehyde into water and carbon dioxide cannot reach 100%, it is easy to fall off, and the activity is unstable.
Pending Publication Date: 2021-05-04
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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The preparation method of the catalyst is simple, and the prepared catalyst has the advantages of low cost and the ability to adsorb and decompose formaldehyde gas at room temperature. It can be applied to air purifiers, adsorption and concentration towers, and can significantly and rapidly reduce the concentration of formaldehyde. The efficiency of formaldehyde conversion into water and carbon dioxide cannot reach 100%
[0004] CN102247842A discloses a high-efficiency catalyst for eliminating formaldehyde at room temperature, which can efficiently decompose low-concentration formaldehyde under normal temperature and humidity. 2 -SnO 2 Composite oxidecordieritehoneycombceramic carrier, the combination between the catalyst composite oxide and honeycombceramic is weak, easy to fall off, long-term use has problems such as severe catalyst powder loss, unstable activity, etc.
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Embodiment 1
[0050]This embodiment provides a molecular sieve catalyst, and the molecular sieve catalyst was prepared by a method:
[0051](1) 2 g of Usy molecular sieve and 0.687 ml of hydrochloric acid were added to 39.313 ml of deionized water (0.2 M hydrochloric acid was 0.2 m), stirred at 30 ° C for 6 h, filtered, deionized water washed into neutral, 110 ° C for 12 h, resulting acid treatment Usy molecular sieve;
[0052](2) Take 0.025 g of pelinet with 0.025 g of pelinestation to 20 ml of deionized water to add 1 g of Usy molecular sieves of the acid treatment, mix stirred for 4 h, stir the excess moisture, 110 ° C dry 12h, will result Hype in the tube furnace2Restore, H2The flow rate was 20 ml / min, under 350 ° C, and 1 h was reduced to obtain the molecular sieve catalyst.
[0053]The conversion of the catalyst on formaldehyde is likefigure 1 Demolvedfigure 1 It can be seen that the catalyst of the present invention can remove formaldehyde 100%, exhibiting excellent catalytic activity, and the ca...
Embodiment 2
[0056]This embodiment provides a molecular sieve catalyst, and the molecular sieve catalyst was prepared by a method:
[0057](1) Take 2 g of USY molecular sieve and 0.927 ml of hydrochloric acid (0.25 m), 0.25 M hydrochloric acid concentration is 0.25 m), stirred at 32 ° C, filtered, deionized water washed into neutral, 120 ° C oven for 13 h, to obtain acid treatment Usy molecular sieve;
[0058](2) Add 0.056 g of nitrate and 0.0365 g of nitrate to 20 ml of deionized water to add 1 g of USY molecular sieves of the acid treatment, mix stirred for 6 h, stirring and removing excess moisture, 110 ° C drying 10h, The resulting sample is used in tubular furnace2Restore, H2The flow rate was 25 ml / min, under 360 ° C, 0.2 h was reduced to obtain the molecular sieve catalyst.
Embodiment 3
[0060]The present embodiment differs from the first embodiment only that the concentration of the acid solution is 0.1 m, and the other conditions and parameters are identical to the first embodiment.
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Abstract
The invention provides a molecular sieve catalyst as well as a preparation method and application thereof. The catalyst comprises a USY molecular sieve and an active component, wherein the USY molecular sieve is subjected to acid treatment. According to the invention, the active component is loaded on the molecular sieve subjected to acid treatment to prepare the molecular sieve catalyst, and formaldehyde is purified by utilizing an adsorption-catalysis synergistic effect. The molecular sieve catalyst avoids the trouble that an adsorbent needs to be regenerated due to saturated adsorption capacity, and formaldehyde is subjected to in-situ catalytic purification while formaldehyde is adsorbed and concentrated through a couplingcatalysis technology.
Description
Technical field[0001]The invention belongs to the field of catalyst involves a molecular sieve catalyst and a preparation method thereof.Background technique[0002]With the rapid development of the industry, h2S, SO2, NO, NO2And the emissions of formaldehyde are increasing, and the caused pollution has brought serious impact on people's lives and the environment. Formaldehyde is one of the most important contaminants in indoors, and the human body has long exposed to a high concentration of formaldehyde to serious harm to health. It is a practical technology that eliminates formaldehyde contamination by using catalysts into carbon dioxide and water using catalysts in the air purifier.[0003]CN107694564A discloses a catalyst for decomposing formaldehyde and a preparation method thereof. The carrier of the catalyst is activated carbon, and the active component of the catalyst is a platinum and palladium loaded on the carrier, and the catalyst further includes a hydrophobic component, th...
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IPC IPC(8): B01J29/12B01D53/86B01D53/72
CPCB01J29/126B01D53/8668B01J2229/186
Inventor 贺泓刘晓峰陈毓敏李要彬秦奇
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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