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Bifunctional adsorbent as well as preparation method and application thereof

A dual-function, adsorbent technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of high energy consumption, easily destroying the molecular structure of the adsorbent, complicated steps, etc., to improve the cycle life, The effect of enhancing selective adsorption performance and increasing adsorption capacity

Active Publication Date: 2021-12-21
QINGDAO CHUANGQI MAIWO ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN202011244466.8 discloses a method for preparing an activated carbon fiber-based adsorbent for removing hydrogen sulfide, phosphine, arsine, and ammonia, which can simultaneously remove various air pollutants with high efficiency, but its The preparation method is firstly treated by plasma, then impregnated, and finally roasted in a microwave muffle furnace, which requires high energy consumption, high cost and cumbersome steps.
Although the adsorption method has advantages in the treatment of odorous gases, it has to face the problem of how to effectively regenerate the adsorbent that has been deactivated by adsorption saturation.
High-temperature calcination is a commonly used method for adsorbent regeneration. Although this method can restore micropores and active sites, heat accumulation during the calcination process easily destroys the internal molecular structure of the adsorbent and affects regeneration efficiency.
For example, patent CN201110167136.8 discloses a method for regeneration of molecular sieve catalysts, which involves inactivated molecular sieves being roasted at constant temperature in stages to achieve regeneration; patent CN201610153307.4 discloses a method for regeneration of deactivated titanium-silicon molecular sieve catalysts, through acid treatment and alkali Roasting after treatment can effectively remove metal impurities and anatase, and its activity and life can reach the level of fresh agents. However, these methods have many processing steps, easily produce waste liquid, and are not environmentally friendly.

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  • Bifunctional adsorbent as well as preparation method and application thereof
  • Bifunctional adsorbent as well as preparation method and application thereof
  • Bifunctional adsorbent as well as preparation method and application thereof

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preparation example Construction

[0025] Specifically, as an aspect of the technical solution of the present invention, the preparation method of a dual-functional adsorbent involves: modifying the cryptomanganite molecular sieve with metal chlorides to obtain a dual-functional adsorbent.

[0026] In some preferred embodiments, the preparation method specifically includes: dissolving the metal chloride in water to form a metal chloride solution, adding cryptopermantite molecular sieves and ultrasonically mixing for 15-30 minutes, then stirring at 30-50°C for 2-4 hours, Afterwards, impregnation treatment is carried out at room temperature for 6-12 hours to obtain the bifunctional adsorbent.

[0027] Further, the content of the metal chloride in the metal chloride solution is 5-12wt%.

[0028] In some preferred embodiments, the metal chloride comprises CuCl 2 、CoCl 2 , FeCl 3 , CeCl 2 , ZnCl 2 Any one or a combination of two or more, and not limited thereto.

[0029] Further, the metal chloride is CuCl 2 ...

Embodiment 1

[0053] metal chloride CuCl 2 、CoCl 2 , FeCl 3 , CeCl 2 , ZnCl 2 The mixed solution is configured according to the molar ratio of 1:0.5:0.5:0.2:0, and the mass fraction of the metal chloride in the mixed solution is 5%. Weigh 10g of OMS-2 molecular sieve with a particle size of 20-40 mesh, and add OMS-2 to the above solution, mix ultrasonically for 15min, then stir with a magnetic stirrer for 3h at a temperature of 30°C, and Immerse at room temperature for 6 hours, filter, wash, and dry in an oven at 80°C to obtain a dual-functional adsorbent (microscopic morphology as shown in figure 2 As shown, the XRD diagram is as follows image 3 shown). The resulting bifunctional adsorbent is denoted as C-O-1. Pass the obtained dual-functional adsorbent through the adsorbent performance evaluation device, hydrogen sulfide is used as the evaluation gas, and the inlet H 2 S concentration 300ppm, space velocity 5000h -1 , measure the breakthrough adsorption capacity, and continue t...

Embodiment 2

[0056] metal chloride CuCl 2 、CoCl 2 , FeCl 3 , CeCl 2 , ZnCl 2 The mixed solution is configured according to the molar ratio of 0.5:0.5:0.5:0:0.3, and the mass fraction of the metal chloride in the mixed solution is 12%. Weigh 10g of OMS-2 molecular sieve with a particle size of 20-40 mesh, and add OMS-2 to the above solution, ultrasonically mix for 30min, then stir with a magnetic stirrer for 4h at a temperature of 40°C, and Immerse at room temperature for 12 hours, finally filter, wash, and dry in an oven at 100°C to obtain a dual-functional adsorbent (XRD figure shown in image 3 shown). The resulting bifunctional adsorbent is denoted as C-O-2. The obtained dual-functional adsorption is passed through the adsorbent performance evaluation device, ammonia gas is used as the evaluation gas, and the inlet NH 3 Concentration 300ppm, space velocity 8000h -1 , measure the breakthrough adsorption capacity, and continue to ventilate. When the concentration reaches 50ppm, th...

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Abstract

The invention discloses a bifunctional adsorbent as well as a preparation method and application thereof. The preparation method comprises the following step: carrying out modification treatment on a cryptomelane molecular sieve by adopting metal chloride to obtain the bifunctional adsorbent. According to the invention, the chloride is used to modify the cryptomelane molecular sieve to prepare the adsorbent with dual catalysis and adsorption functions, so adsorption capacity is improved, and the cycle service life of the adsorbent is prolonged; and after the bifunctional adsorbent is inactivated due to adsorption saturation, ozone can be converted into active oxygen atoms with higher oxidizing property due to the specific efficient ozone decomposition effect of the cryptomelane molecular sieve, and peculiar smell molecules on the surface of the adsorbent are subjected to oxygenolysis; that is, normal-temperature regeneration of the adsorbent is realized in an ozone atmosphere, deep degradation of peculiar smell gas such as ammonia gas and hydrogen sulfide can be achieved in a regeneration process, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, and in particular relates to a dual-functional adsorbent and its preparation method and application. Background technique [0002] There are various smells in the living environment, such as floral, fruity, and essential oil scents, which are fresh and pleasant, and can play a soothing role. However, there are also some gases that are not only unpleasant, but also cause physical discomfort when the concentration is high or for a long time. Toxins, such as ammonia, hydrogen sulfide, methyl mercaptan and other odor molecules. [0003] At present, the treatment of odor gas includes solution absorption method, combustion method, biological decomposition method, catalytic oxidation method, adsorption method, etc. Among them, the adsorption method is simple to operate, and physical and chemical interactions can occur between odor molecules and adsorbents, and the treatment efficiency is high. The a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30B01J20/34B01J27/10B01J27/122B01J27/128B01J27/138B01J27/32B01D53/86B01D53/02B01D53/48B01D53/52B01D53/58
CPCB01J20/0288B01J20/06B01J27/10B01J27/128B01J27/122B01J27/138B01J20/3433B01J20/3458B01J27/32B01D53/02B01D53/8606B01D53/8612B01D53/8634Y02A50/20
Inventor 赵宏张傑
Owner QINGDAO CHUANGQI MAIWO ENVIRONMENTAL TECH CO LTD
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