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Application of a cha-type molecular sieve in the adsorption of formaldehyde

A technology for adsorbing formaldehyde and molecular sieves, applied in separation methods, dispersed particle separation, silicates, etc., can solve problems such as inability to achieve long-term and complete removal of formaldehyde and endanger human health

Active Publication Date: 2020-03-20
FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an adsorbent material mainly used to adsorb and remove low-concentration formaldehyde contained in indoor air should not only have a high adsorption capacity for low-concentration formaldehyde, but also must have a high ratio of firm retention of the adsorbed formaldehyde so that it is no longer As time goes by, it is gradually desorbed (that is, released) from the zeolite molecular sieve that adsorbs it and returns to the indoor air, endangering human health.
[0004] However, the study found that the FAU-type zeolite molecular sieve has the highest total adsorption capacity for formaldehyde compared with other zeolite molecular sieves, but the ratio of the adsorbed formaldehyde firm retention is only about 30%.
This means that 70% of the adsorbed formaldehyde may be released one after another in the future. Such formaldehyde adsorbents cannot achieve long-term and complete removal of formaldehyde on air pollution in actual use.

Method used

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  • Application of a cha-type molecular sieve in the adsorption of formaldehyde
  • Application of a cha-type molecular sieve in the adsorption of formaldehyde

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Experimental program
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Embodiment 1

[0032] According to the method provided by the document Verified Syntheses of Zeolitic Materials P123 (2001 Elsevier Science B.V.; H. Robson editor), K-CHA type chabazite (K-chabasite), namely K type low silica SSZ-13 zeolite, was synthesized. Take 80 grams of K-CHA type chabazite and 40 grams of SiO 2 30wt% silica sol is mixed, extruded into a columnar material with a diameter of 3 mm by a laboratory extruding forming machine, dried and calcined at 550°C for 3 hours and cooled to room temperature to obtain an adsorbent.

Embodiment 2

[0034] K-CHA type chabazite (K-chabasite) was synthesized according to the method provided by the document Verified Syntheses of Zeolitic Materials P123 (2001 Elsevier Science B.V.; H. Robson editor), and 100g of K-CHA type chabazite was used with 500 mL of 1M NH 4 The Cl solution was mixed and stirred at room temperature for 5 hours, filtered, washed with deionized water three times, and filtered and dried to make NH 3 -CHA zeolite powder. The zeolite powder and 40 grams containing SiO 2 After 30wt% silica sol is mixed, it is extruded into a columnar material with a diameter of 3 mm by a small laboratory extruder, dried and calcined at 550°C for 3 hours and cooled to room temperature to obtain an adsorbent.

Embodiment 3

[0036] According to the patent application number 201710314597.0, SSZ-13 powder with a molar ratio of silicon to aluminum (SAR) of 23 was synthesized, and 80 g of the SSZ-13 powder was mixed with 40 grams of SiO 2 After 30wt% silica sol is mixed, it is extruded into a columnar material with a diameter of 3 mm by a small laboratory extruder, dried and calcined at 550°C for 3 hours and cooled to room temperature to obtain an adsorbent.

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Abstract

The invention provides an application of a CHA-structure molecular sieve in the adsorption of formaldehyde. When the CHA-structure molecular sieve SSZ-13 zeolite molecular sieve or SAPO-34 silicoaluminophosphate molecular sieve is used for adsorbing formaldehyde, the saturated formaldehyde adsorption quantity is greater than 200 mg / g, and the strong adsorption rate of formaldehyde is greater than90%, so the CHA-structure molecular sieve is an excellent adsorbent for removing formaldehyde pollution.

Description

Technical field [0001] The invention relates to the technical field of adsorbents, in particular to the application of a CHA-type structural molecular sieve in the adsorption of formaldehyde. Background technique [0002] Formaldehyde is a common indoor pollutant. Its vapor can cause chronic respiratory diseases through inhalation and skin contact. Long-term exposure can damage the human immune system and cause organ cancer. At present, the methods to treat formaldehyde pollution mainly include ventilation method, chemical reaction method, catalytic oxidation method, physical adsorption method, etc. Compared with other methods, the adsorption method has the advantages of high removal efficiency, strong enrichment function, and not easy to cause secondary pollution. It is an effective method to treat low-concentration harmful gases in recent years. [0003] Compared with activated carbon, zeolite molecular sieve is an adsorbent with excellent formaldehyde adsorption performance, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01J20/16
CPCB01D53/04B01D2253/108B01D2257/704B01D2257/708B01D2258/06B01J20/16
Inventor 龙英才濮鹏翔王凯林德昌
Owner FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD