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Supported noble metal catalyst based on carrier morphology modification and its preparation and application

A noble metal catalyst, supported technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve low catalytic activity, long-term working stability and moisture resistance To achieve the effect of high-efficiency catalytic formaldehyde decomposition, excellent stability and moisture resistance, and easy mass production

Active Publication Date: 2021-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, noble metal catalysts still generally have shortcomings such as low catalytic activity for catalytic oxidation of formaldehyde, long-term work stability and poor moisture resistance. Key Problems to be Solved in the Process of Practical Application of Oxidation Technology

Method used

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  • Supported noble metal catalyst based on carrier morphology modification and its preparation and application
  • Supported noble metal catalyst based on carrier morphology modification and its preparation and application
  • Supported noble metal catalyst based on carrier morphology modification and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Catalyst preparation:

[0041] Fe 2 o 3 Synthesis of -HO: 1.0mmol FeCl 3 ·6H 2 O and 10.5mmol NaF were dissolved in 30mL ultrapure water to form a transparent solution, and 0.12mL NH 3 ·H 2 O (12%) was added to the above solution to continue sonication for 10 minutes. Subsequently, the above-mentioned suspension was placed in a hydrothermal kettle with a volume of 50 mL, and after being treated at a constant temperature of 180 °C for 24 hours, it was naturally cooled to room temperature. Carry out vacuum drying 6 hours; Make target carrier Fe 2 o 3 -HO.

[0042] Pt / Fe 2 o 3 Synthesis of -HO: 100 mg of Fe synthesized above 2 o 3 -HO was dispersed in 10 mL of ultrapure water, and 0.27 mL of H 2 PtCl 6 (19.3mM) solution was continuously stirred for 30 minutes; subsequently, 1.70mL of NaBH 4 (0.1M) and NaOH (0.1M) mixed reducing agent was added to the suspension and stirred for 2 hours. The prepared sample was fully cleaned and then vacuum-dried at 60°C ...

Embodiment 2

[0053] (1) Catalyst preparation:

[0054] In the synthesis method of the present embodiment, only FeCl 3 ·6H 2 O is replaced by Fe(NO 3 ) 3 9H 2 O and H 2 PtCl 6 Replaced with HAuCl 4 , all the other preparation conditions are consistent with Example 1.

[0055] (2) Phase / structural characterization of the catalyst:

[0056] The obtained hydrothermal state sample Fe of the present embodiment 2 o 3 -HO and Au loaded sample Au / Fe 2 o 3 X-ray diffraction of -HO as Figure 9 shown. According to XRD analysis ( Figure 9 ), the synthesized hydrothermal samples and Au-loaded samples are both α-Fe 2 o 3 crystal phase.

[0057] Transmission electron microscope observation ( Figure 10 In a) it is found that the structure of the target catalyst is consistent with that of Example 1, which is octadecahedral Fe with a hollow structure 2 o 3 Supported Au catalyst (Au / Fe 2 o 3 -HO), at the same time, it was found that there were a large number of newly generated nanopar...

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Abstract

The invention belongs to the technical field of catalytic materials, and discloses a supported noble metal catalyst based on carrier morphology modification, as well as its preparation and application. The catalyst is composed of a noble metal active phase and a metal oxide carrier phase, and the noble metal active phase is dispersed and distributed on the surface of the metal oxide carrier phase in the form of fine nanoparticles. In the present invention, a synergistic catalytic active site is constructed through the combination of the noble metal active phase and the oxide carrier. At the same time, the octahedral structure of the carrier improves the dispersion of the noble metal on the surface of the oxide, making it dispersed in the form of fine nanoparticles on the surface of the oxide carrier phase. In addition, the oxygen vacancies introduced by the partial reduction of the support oxide help to improve the catalyst’s adsorption and dissociation of water molecules to generate hydroxyl species, providing a large number of hydroxyl adsorption sites and reactive hydroxyl species. Thereby synergistically improving the activation of the catalyst for oxygen molecules and the adsorption of formaldehyde. The overall catalytic performance is close to that of the corresponding supported noble metal catalysts reported so far.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a supported noble metal catalyst based on carrier morphology modification and its preparation and application. Background technique [0002] Indoor air pollution has become an environmental problem that is widely concerned by countries all over the world. Formaldehyde (HCHO), as a common air pollutant that mainly comes from various indoor decoration materials, has been identified as a carcinogenic and teratogenic substance by the World Health Organization. Its effective treatment has attracted the general attention of researchers at home and abroad. Among various air purification technologies, catalytic oxidation is considered to be a safe and efficient formaldehyde removal technology. This technology can catalytically oxidize formaldehyde to carbon dioxide (CO2) under relatively mild conditions. 2 ) and water (H 2 O), has the advantages of low energy c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J37/10B01J37/16B01D53/86B01D53/72
CPCB01J23/8906B01J37/10B01J37/16B01D53/8668B01D2257/704B01J35/393B01J35/23
Inventor 王平陈木华
Owner SOUTH CHINA UNIV OF TECH
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