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Chlorobenzene catalytic degradation method by absorption-low temperature plasma and preparation method of adsorptive catalyst thereof

A low-temperature plasma and plasma technology, applied in catalyst activation/preparation, physical/chemical process catalysts, separation methods, etc., can solve the problem of lack of selectivity of pollutants, and achieve improved CO2 selectivity, low energy consumption, and reduced energy consumption. The effect of by-products

Inactive Publication Date: 2017-09-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, plasma alone is prone to produce some by-products, such as ozone, nitrogen oxides, etc., and lacks selectivity for the pollutants to be treated.

Method used

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  • Chlorobenzene catalytic degradation method by absorption-low temperature plasma and preparation method of adsorptive catalyst thereof
  • Chlorobenzene catalytic degradation method by absorption-low temperature plasma and preparation method of adsorptive catalyst thereof
  • Chlorobenzene catalytic degradation method by absorption-low temperature plasma and preparation method of adsorptive catalyst thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: the preparation of Ag / AC catalyst (Ⅰ)

[0043] (1) Carrier pretreatment: Activated carbon is washed with water before use to remove inorganic impurities on the surface, then washed with 0.1-0.2mol / L nitric acid, then washed with water until neutral, and dried at 110°C for 12 hours for use.

[0044] (2) Catalyst preparation: take 0.1574g of silver nitrate, dissolve it in 100mL of distilled water, add 9.8426g of pretreated activated carbon under stirring, stir at 55°C for 5 hours, let it stand for 2.5 hours, dry at 110°C for 12h, and put it in a nitrogen atmosphere Heating to 450°C at a heating rate of 3°C / min and keeping the temperature constant for 2h, cooling, washing with water and drying to obtain the 8g Ag / AC catalyst (I). The EDS layered images, SEM images, and EDS spectra of the Ag / AC catalyst are shown in Figure 7 , XRD diagram see Figure 8 .

Embodiment 2

[0045] Embodiment 2: the preparation of Ag / AC catalyst (Ⅱ)

[0046] (1) Carrier pretreatment: Activated carbon was washed with water before use to remove inorganic impurities on the surface, then washed with 0.1mol / L nitric acid, then washed with water until neutral, and dried at 105°C for 11 hours before use.

[0047] (2) Catalyst preparation: Take 0.1574g of silver nitrate, dissolve it with 100mL of distilled water, add 9.8426g of pretreated activated carbon under stirring, stir at 50°C for 4h, let it stand for 2h, dry at 105°C for 13h, and dry it at 105°C for 13h. Heating rate of ℃ / min to 450 ℃ and constant temperature for 2.5h, cooling, washing and drying to obtain 8g Ag / AC catalyst (Ⅱ)

Embodiment 3

[0048] Embodiment 3: Ag / AC catalyst adsorption performance test

[0049] The adsorption performance of the catalyst is one of the keys of the adsorption-plasma catalytic system, so the adsorption performance of the Ag / AC adsorption catalyst prepared in Example 1 was tested. Set the flow rate of the chlorobenzene stream to 2L / min, and the intake concentration to 180mg / m 3 , the amount of catalyst is 0.3g, from the breakthrough curve of activated carbon, it can be concluded that the breakthrough time of Ag / AC is 35min, and the Ag in Ag / AC may be expressed as Ag + It exists in the form and can form a strong π complex bond with chlorobenzene. The results show that the catalyst with AC as the carrier has a good adsorption effect of chlorobenzene, which has obvious advantages in the later stage of NTP treatment.

[0050] Test of p-Chlorobenzene Removal Efficiency of Ag / AC Catalyst

[0051] (1) The flow velocity of the chlorobenzene airflow is set to be 2L / min, and the intake conc...

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Abstract

The invention discloses a chlorobenzene catalytic degradation method by absorption-low temperature plasma. The method includes steps of placing Ag / AC catalyst in a discharge zone of a dielectric barrier discharge low-temperature plasma reactor; carrying chlorobenzene in the air and charging to the dielectric barrier discharge low-temperature plasma reactor in a gas form; absorbing chlorobenzene by Ag / AC catalyst; at the moment, the plasma power of the reactor is under a closing state; after being absorbed fully, charging oxygen-containing gas while stopping blowing the air carried with chlorobenzene; opening the plasma power of the reactor, discharging and oxidizing the absorbed chlorobenzene by the plasma, and realizing the degradation of chlorobenzene. The method combines adsorptive catalyst with low-temperature plasma, displays advantages of the low-temperature plasma of low energy consumption of low-temperature plasma, rapid chemical reaction, complete purification, wide adaptation, and effectively realizes the chlorobenzene degradation.

Description

technical field [0001] The invention relates to a preparation method of an adsorption-catalyst and its application in combination with low-temperature plasma to degrade chlorobenzene. Background technique [0002] Chlorobenzenes (CBs) belong to halogenated aromatic hydrocarbons and are a class of hydrophobic persistent organic pollutants. It replaces the hydrogen atom on the benzene ring with a chlorine atom to generate chlorinated aromatic hydrocarbons. Chlorobenzene compounds (CBs) are a class of important synthetic raw materials, widely used in dyes, spices, pesticides, intermediates in organic synthesis, for the production of chlorine-containing organic compounds, and for the preparation of solvents and auxiliaries, etc. A class of toxic organic compounds that are widely distributed in the environment and are difficult to biodegrade. CBs widely exist in the environment. Evidence of CBs has been found in soil, wastewater, sludge, vegetables, lake water, fish, human adi...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/68B01J23/50B01J35/10B01J37/02B01J37/08
CPCB01D53/68B01D53/8662B01J23/50B01J37/0207B01J37/08B01D2255/104B01D2255/206B01D2259/818B01D2257/2064B01J35/618
Inventor 姜理英缪晶晶李莎郭海倩
Owner ZHEJIANG UNIV OF TECH
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