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

A bimetallic nano-composite material technology, which is applied in the field of solid acid-bimetallic nanoparticle composite materials and their preparation, can solve the problems of low reactivity, easy carbon deposition and inactivation, and many by-products, etc., and achieves enhanced interaction, Efficient catalytic conversion and improved dispersibility

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 problems of chlorine poisoning and easy sintering loss, and because the precious metal itself is scarce and expensive, the practical application of the noble metal-supported catalyst 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

[0067] A solid acid-bimetallic nanoparticle composite material, comprising the following steps:

[0068] 1) Preparation of MOF-253 material loaded with Pd-Co bimetallic nanoparticles

[0069] Dissolve 1 mmol aluminum chloride, 1 mmol 2,2'-bipyridine-5,5'-dicarboxylic acid, and 1 mmol glacial acetic acid in 60 mL of N,N-dimethylformamide, and transfer it to the reactor; Then add a certain amount of bisacetonitrile palladium chloride and cobalt nitrate in the reactor, control Pd 2+ / Co 2+ The molar ratio of the precursor is 2:1, while controlling the total metal content in the precursor (Pd 2+ +Co 2+ ) is 1 wt%;

[0070] Pass hydrogen into the reactor again, replace the air in the reactor, react at 80°C for 24h, then raise the temperature to 135°C and continue the reaction for 4h, the obtained solid product is filtered, washed, and vacuum-dried at 150°C for 12h , to obtain the MOF-253 material (ie precursor material) loaded with Pd-Co bimetallic nanoparticles.

[0071] 2) ...

Embodiment 2

[0086] A solid acid-bimetallic nanoparticle composite material, comprising the following steps:

[0087] 1) Preparation of MOF-253 material loaded with Pd-Co bimetallic nanoparticles

[0088] Dissolve 1mmol of aluminum sulfate, 1mmol of 2,2'-bipyridine-5,5'-dicarboxylic acid, and 1mmol of hydrochloric acid in 60mL of N,N-dimethylformamide, and transfer it to the reactor; Add a certain amount of diacetonitrile palladium chloride and cobalt acetate in the reactor to control the Pd 2+ / Co 2+ The molar ratio of the precursor is 2:1, while controlling the total metal content in the precursor (Pd 2+ +Co 2+ ) is 0.25wt%;

[0089] Pass hydrogen into the reactor again, replace the air in the reactor, react at 80°C for 20h, then raise the temperature to 130°C and continue the reaction for 4h, the obtained solid product is filtered, washed, and vacuum-dried at 150°C 12h, the MOF-253 material loaded with Pd-Co bimetallic nanoparticles was obtained.

[0090] 2) Preparation of Pd 2 c...

Embodiment 3

[0094] A solid acid-bimetallic nanoparticle composite material, comprising the following steps:

[0095] 1) Preparation of MOF-253 material loaded with Pd-Co bimetallic nanoparticles

[0096] Dissolve 1 mmol of aluminum 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 transfer them to the reactor; then Add a certain amount of palladium nitrate and cobalt chloride to the reactor to control the Pd 2+ / Co 2+ The molar ratio of the precursor is 2:1, while controlling the total metal content in the precursor (Pd 2+ +Co 2+ ) is 2.5wt%;

[0097] Pass hydrogen into the reactor again, replace the air in the reactor, react at 80°C for 36h, then raise the temperature to 140°C and continue the reaction for 5h, the obtained solid product is filtered, washed, and vacuum-dried at 150°C 12h, the MOF-253 material loaded with Pd-Co bimetallic nanoparticles was obtained.

[0098] 2) Preparation of Pd 2 co 1...

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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 a solid acid carrier Al2O3 and loaded Pd-Co bimetallic nanoparticles. The preparation method comprises the following steps: 1) dispersing an aluminum salt, a polydentate carboxylic acid ligand, an acid, a palladium salt and a cobalt salt in an organic solvent, and carrying out a solvothermal reaction with step-by-step heating in a reducing atmosphere to obtain a Pd-Co bimetallic nanoparticle-loaded MOF-253 material; and 2) placing the MOF-253 material loaded with the Pd-Co bimetallic nanoparticles in an oxidizing atmosphere for roasting, and then placing the MOF-253 material loaded with the Pd-Co bimetallic nanoparticles in a reducing atmosphere for heat treatment to obtain the solid acid-bimetallic nanoparticle composite material. The composite material can resist poisoning, has high catalytic activity and good stability, and is suitable for catalytic oxidation of chlorine-containing volatile organic compounds.

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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/44B01D53/70
CPCB01J23/8913B01J35/006B01D53/8662B01D53/8687B01D2257/708
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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