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Method for preparing monatomic catalyst by using waste adsorbent after adsorption and desorption

An adsorbent and catalyst technology, applied in the field of preparing single-atom catalysts, can solve problems such as ineffective treatment, and achieve the effects of relieving the pressure of solid waste disposal, high activation capacity, and protecting the environment

Pending Publication Date: 2021-04-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adsorption of heavy metal ions - The waste adsorbent after analysis is adsorbed with zinc ions and one or more other heavy metal ions. Since the adsorption of heavy metal ions by the adsorbent is based on the chelation between chemical functional groups and metal ions, due to the dispersion of zinc ions and Occupying the site, after low-temperature and high-temperature pyrolysis and carbonization, a single-atom catalyst is finally obtained, which not only solves the problem that the adsorbent saturated with heavy metal ions cannot be effectively treated, but also provides a new way for large-scale production of single-atom catalysts , simple operation and low cost

Method used

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  • Method for preparing monatomic catalyst by using waste adsorbent after adsorption and desorption
  • Method for preparing monatomic catalyst by using waste adsorbent after adsorption and desorption
  • Method for preparing monatomic catalyst by using waste adsorbent after adsorption and desorption

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Embodiment 1

[0039] A kind of method that utilizes the discarded adsorbent after adsorption-analysis to prepare copper single-atom catalyst, its process sees figure 1 .

[0040] (1) The waste adsorbent is after 6 times of adsorption-analysis of Zn ions and Cu ions in the wastewater containing Zn ions and Cu ions, and then dried to obtain a dry waste adsorption with a Zn / Cu adsorption ratio of about 4:3. agent; take 10g dry waste adsorbent, mix according to waste adsorbent:dicyandiamide=1:10 mass ratio, put it into porcelain boat for compaction;

[0041] (2) Put it into a tube furnace, heat it up to 550°C at a rate of 5°C / min under a nitrogen atmosphere, then keep it warm for 1 hour, then raise the temperature to 900°C at the same rate, keep it warm for 2 hours, then cool it down to room temperature, take it out Wash with deionized water and ethanol, and finally dry at 60°C to obtain a copper single-atom adsorbent, and its structural representation is shown in figure 2 shown. The results ...

Embodiment 2

[0043] A method for preparing iron single-atom catalysts by using waste adsorbent after adsorption-analysis, the steps are as follows:

[0044] (1) The waste adsorbent is dried after 6 times of adsorption-analysis of Zn ions and Fe ions in the wastewater containing Zn ions and Fe ions to obtain a dry waste adsorption with a Zn / Fe adsorption ratio of about 4:3. agent; take 10g dry waste adsorbent, mix according to waste adsorbent:dicyandiamide=1:10 mass ratio, put it into porcelain boat for compaction;

[0045] (2) Put it into a tube furnace, heat it up to 550°C at a rate of 5°C / min under a nitrogen atmosphere, then keep it warm for 1 hour, then raise the temperature to 900°C at the same rate, keep it warm for 2 hours, then cool it down to room temperature, take it out Wash with deionized water and ethanol, and finally dry at 60°C to obtain iron single-atom adsorbent, the structure characterization diagram is as follows image 3 and 5 shown. The results indicated that iron a...

Embodiment 3

[0047] A method for preparing a cobalt single-atom catalyst by using the waste adsorbent after adsorption-analysis, the steps are as follows:

[0048] (1) The waste adsorbent is after 6 times of adsorption-analysis of Zn ions and Co ions in the wastewater containing Zn ions and Co ions, and then dried to obtain a dry waste adsorption with a Zn / Co adsorption ratio of about 4:3. agent. Take 10g of dry waste adsorbent, mix it according to the mass ratio of waste adsorbent:dicyandiamide=1:10, put it into a porcelain boat for compaction,

[0049] (2) Put it into a tube furnace, heat it up to 550°C at a rate of 5°C / min under a nitrogen atmosphere, then keep it warm for 1 hour, then raise the temperature to 900°C at the same rate, keep it warm for 2 hours, then cool it down to room temperature, take it out Wash with deionized water and ethanol, and finally dry at 60°C to obtain a cobalt single-atom adsorbent, and its structural characterization diagram is as follows Figure 4 shown...

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Abstract

The invention provides a method for preparing a monatomic catalyst by using a waste adsorbent after adsorption and desorption, which comprises the following steps: mixing a catalyst for adsorbing heavy metal ions with a nitrogen source, and carrying out staged pyrolysis in a nitrogen protective atmosphere to obtain the monatomic catalyst. According to the invention, cheap hazardous wastes are used as raw materials, the preparation of the monatomic catalyst is realized by utilizing the dispersion form of adsorbed heavy metal ions in the adsorbent, the metal monatomic distribution is uniform, the dispersity is good, the secondary pollution of the waste adsorbent after heavy metal adsorption is avoided, the solid waste treatment pressure is relieved, and the environment is protected; the method is simple to operate and low in cost, the prepared product is high in metal monatomic loading capacity and good in dispersity, and a new thought is provided for large-scale production of monatomic catalysts.

Description

technical field [0001] The invention relates to a method for preparing single-atom catalysts by using waste adsorbents after adsorption and analysis, and belongs to the technical fields of waste resource utilization and nanometer materials. Background technique [0002] In recent years, with the continuous development and progress of nanocatalysis technology, researchers have found that atoms with unsaturated coordination on the surface are potential active sites for catalysis. To regulate the distribution and structure of catalyst surface atoms to further improve the catalytic performance of materials. Studies have shown that when the size of nanomaterials is reduced to the cluster or single-atom level, its energy level structure and electronic structure will undergo fundamental changes. It is precisely because of this unique structural feature that single-atom catalysts perform better than Activity, selectivity and stability of conventional nanocatalysts. Single-atom mat...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 高宝玉潘静文高悦岳钦艳
Owner SHANDONG UNIV