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Preparation method and application of a lignin-based adsorption-catalytic material

A catalytic material and lignin-based technology, which is applied in the preparation of lignin-based adsorption-catalytic materials and the removal of chlorinated aromatics in gas and the removal of low-concentration chlorinated aromatics, which can solve the problems of poor single adsorption and single catalytic effect , to achieve low price, improve stability, and increase the effect of specific surface area

Active Publication Date: 2022-05-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problem of poor single adsorption or single catalytic effect on chlorinated aromatic hydrocarbon pollutants in the prior art, the purpose of the present invention is to provide a preparation method and application of a lignin-based adsorption-catalytic material

Method used

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  • Preparation method and application of a lignin-based adsorption-catalytic material
  • Preparation method and application of a lignin-based adsorption-catalytic material
  • Preparation method and application of a lignin-based adsorption-catalytic material

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Embodiment 1

[0023] 1. Lignin pretreatment

[0024] Weigh 10 g of alkaline lignin, pass through a 60-mesh sieve, and obtain the under-sieve part and put it in a drying oven for 24 hours of drying treatment. Then take 5g of potassium hydroxide powder and dissolve it in deionized water to make an alkaline KOH solution with pH=11;

[0025] Mix 5 g of dried lignin with 25 mL of the above KOH solution, and stir at room temperature for 2 h.

[0026] Add a HCl solution with a concentration of 1mol / L to neutralize, then wash with deionized water until neutral, filter with suction, and place the obtained filter cake in an oven for drying at a drying temperature of 105°C and a drying time of 13 hours;

[0027] 2. Preparation of adsorption-catalytic materials

[0028] Prepared by an equal-volume impregnation method, slowly drop distilled water into 5 g of the above-mentioned pretreated lignin (LC-B) until the above-mentioned material absorbs water just to reach saturation, and the volume of the imp...

Embodiment 2

[0048] The steps of this embodiment are the same as those of Embodiment 1, except that the loading of Ru in this embodiment is 1 wt%.

Embodiment 3

[0062] In this example, the adsorption-catalytic material (Ru / LC-B) prepared in Example 1 was used to treat chlorinated aromatic hydrocarbons.

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Abstract

The present invention relates to a preparation method and application of a lignin-based adsorption-catalytic material. The preparation method uses lignin as a carbon source, firstly performs strong alkali pretreatment on the lignin, and then mixes the pretreated lignin with a Ru salt solution impregnation, and finally carbonization under an inert atmosphere to obtain the adsorption-catalytic material. The invention realizes the one-step "adsorption-catalysis" removal of chlorinated aromatics, and solves the problems of low treatment efficiency and high energy consumption caused by the single adsorption method, which only absorbs and does not degrade, and uses adsorbents and catalysts separately. Adsorption-catalytic materials can completely oxidize and degrade pollutants into CO 2 and H 2 O and other non-toxic products, and the material can be recovered and recycled; in addition, the present invention first loads and then carbonizes, realizes the integration of adsorption and catalysis, reduces the overall carbonization temperature, and helps the adsorption-catalysis of chlorinated aromatics in the gas. It is suitable for large-scale promotion and industrial production, and improves production efficiency.

Description

technical field [0001] The invention belongs to the field of air pollution control, and in particular relates to the preparation of a lignin-based adsorption-catalysis material and a method for removing chlorinated aromatics in gas, especially for the removal of low-concentration chlorinated aromatics. Background technique [0002] Chlorinated aromatics pollutants have three characteristics of "carcinogenic, teratogenic, and mutagenic" and high toxicity. The pollution control of chlorinated aromatics has attracted widespread attention at home and abroad. Adsorption is often used for pollutant removal by adsorbing pollutant molecules. However, the adsorption treatment method can only enrich the pollutant molecules, and cannot completely degrade the pollutants into non-toxic products. In addition, the adsorption capacity of the adsorbent is limited, and repeated recovery requires heating treatment, which leads to the desorption of pollutants and secondary pollution. Catalyti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J31/22B01J35/10B01J20/22B01J20/28B01J20/20B01J20/30B01D53/86B01D53/70B01D53/04
CPCB01J23/462B01J31/2213B01J20/20B01J20/223B01J20/28059B01J20/28061B01J20/28066B01D53/8662B01D53/04B01D2257/708B01J2531/821B01J35/618B01J35/613B01J35/615
Inventor 郭海威张新一马小东
Owner HEBEI UNIV OF TECH
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