Solid acid-bimetallic nanoparticle composite material as well as preparation method and application thereof

A bimetallic nano-composite material technology, applied in the field of solid acid-bimetallic nanoparticle composite material and its preparation, can solve the problems of easy carbon deposition and deactivation, polychlorinated by-products, low reactivity, etc., to improve the oxidation reaction Activity, efficient catalytic conversion, enhanced interaction effect

Pending Publication Date: 2022-04-29
INST OF CHEM ENG GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the noble metal-supported catalyst has high activity at low temperature, it is easy to generate polychlorinated by-products, accompanied by chlorine poisoning and easy sintering loss. At the same time, due to the scarcity and high price of precious metal resources, the practical application of noble metal-supported catalysts is greatly restricted.
Although the solid acid catalyst has good thermal stability, its application is limited due to its low reactivity, many by-products, and easy carbon deposition and deactivation.
Transition metal-based catalysts are cheap and are the most widely studied type of catalysts. Generally, they have good resistance to chlorine poisoning, but their low-temperature activity and thermal stability are poor.

Method used

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  • Solid acid-bimetallic nanoparticle composite material as well as preparation method and application thereof
  • Solid acid-bimetallic nanoparticle composite material as well as preparation method and application thereof
  • Solid acid-bimetallic nanoparticle composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0072] A solid acid-bimetallic nanoparticle composite material, comprising the following steps:

[0073] 1) Preparation of UiO-67-H immobilized PdCo salt material

[0074] Dissolve 1 mmol of zirconium chloride, 1 mmol of 2,2'-bipyridyl-5,5'-dicarboxylic acid, and 1 mmol of glacial acetic acid in 60 mL of N,N-dimethylformamide, and react at 120°C for 24 hours to obtain The solid product was filtered, washed, and dried under vacuum at 150°C for 12 hours to obtain the acidified metal-organic framework support material UiO-67-H.

[0075] A certain amount of bisacetonitrile, palladium chloride and cobalt nitrate were fully dissolved in 30mL of acetonitrile, and then acidified metal organic framework support material UiO-67-H was added to control the Pd 2+ / Co 2+ The molar ratio is 2:1, while controlling the total metal content (Pd 2+ +Co 2+ ) is 1wt% of the carrier UiO-67-H, react at 65°C for 24h, filter and wash after cooling to room temperature, and vacuum dry at 150°C for 12...

Embodiment 2

[0091] A solid acid-bimetallic nanoparticle composite material, comprising the following steps:

[0092] 1) Preparation of UiO-67-H immobilized PdCo salt material

[0093] Dissolve 1 mmol of zirconium chloride, 1 mmol of 2,2'-bipyridine-5,5'-dicarboxylic acid, and 1 mmol of hydrochloric acid in 60 mL of N,N-dimethylformamide, and react at 120°C for 24 hours to obtain The solid product was filtered, washed, and dried under vacuum at 150°C for 12 hours to obtain the acidified metal-organic framework support material UiO-67-H.

[0094] Dissolve a certain amount of bisacetonitrile palladium chloride and cobalt acetate in 30mL of acetonitrile, then add the acidified metal organic framework support material UiO-67-H, control the Pd 2+ / Co 2+ The molar ratio is 2:1, while controlling the total metal content (Pd 2+ +Co 2+ ) is 0.25wt% of the carrier UiO-67-H, reacted at 65°C for 24h, filtered and washed after cooling to room temperature, and vacuum dried at 150°C for 12h to obtain...

Embodiment 3

[0099] A solid acid-bimetallic nanoparticle composite material, comprising the following steps:

[0100] 1) Preparation of UiO-67-H immobilized PdCo salt material

[0101] Dissolve 1 mmol of zirconium chloride, 1 mmol of 2,2'-bipyridine-5,5'-dicarboxylic acid, and 1 mmol of hydrochloric acid in 60 mL of N,N-dimethylformamide, and react at 120°C for 24 hours to obtain The solid product was filtered, washed, and dried under vacuum at 150°C for 12 hours to obtain the acidified metal-organic framework support material UiO-67-H.

[0102] Fully dissolve a certain amount of palladium nitrate and cobalt chloride in 30mL of acetonitrile, then add the acidified metal organic framework support material UiO-67-H, control the Pd 2+ / Co 2+ The molar ratio is 2:1, while controlling the total metal content (Pd 2+ +Co 2+ ) is 2.5wt% of the carrier UiO-67-H. React at 65°C for 24h, cool to room temperature, filter and wash, and vacuum dry at 150°C for 12h to obtain UiO-67-H immobilized PdCo...

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Abstract

The invention discloses a solid acid-bimetallic nanoparticle composite material as well as a preparation method and application thereof. The composite material disclosed by the invention is prepared from Pd-Co bimetallic alloy nanoparticles and a solid acid carrier ZrO2. The preparation method comprises the following steps: 1) dispersing zirconium salt, a polydentate carboxylic acid ligand and acid in an organic solvent, and carrying out solvothermal reaction to obtain a UiO-67-H material; 2) dissolving a palladium salt and a cobalt salt in a solvent, adding the UiO-67-H material, and carrying out a coupling coordination reaction to obtain a UiO-67-H immobilized PdCo salt material; and (3) the UiO-67-H immobilized PdCo salt material is subjected to a temperature programmed reduction pyrolysis reaction in a reducing atmosphere, and the solid acid-bimetallic nanoparticle composite material is obtained. The composite material can resist chlorine poisoning, has high catalytic activity and good stability, and is suitable for catalytic oxidation of chlorine-containing volatile organic pollutants.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a solid acid-bimetallic nano particle composite material and its preparation method and application. Background technique [0002] Chlorinated Volatile Organic Compounds (CVOCs) are a typical type of VOCs (Volatile Organic Compounds), which widely exist in production processes such as metal smelting, pesticides, medicines, and coatings. Common CVOCs pollutants include dioxin, chloroform, dichloroethane, trichlorethylene, and chlorobenzene. CVOCs pollutants, on the one hand, are not easy to be decomposed or biodegraded, and have high biological toxicity and strong carcinogenic, teratogenic, and mutagenic effects, which seriously threaten human health; on the other hand, CVOCs pollutants can also pass through o 3 A series of photochemical reactions occur to generate secondary pollutants such as photochemical smog and PM 2.5, causing compound air pollution, destroying the atmosp...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01D53/86B01D53/44B01D53/72
CPCB01J23/8913B01D53/8687B01D53/8662B01D2257/708B01J35/393Y02A50/20
Inventor 王曦麦裕良蒋婷婷张俊杰陈佳志
Owner INST OF CHEM ENG GUANGDONG ACAD OF SCI
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