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Supported noble metal catalyst based on amorphization combined with cationic doping modification, preparation method and application

A precious metal catalyst, cation technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, separation method, etc. The problems such as low rate and low reaction rate can be solved to achieve the effect of high utilization rate of precious metals, improved mass transfer performance, and easy availability of raw materials.

Active Publication Date: 2022-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in general, noble metal catalysts still generally have problems such as low activity, low utilization rate of noble metal components (reflected by low catalytic reaction rate per unit mass of noble metal), long-term working stability and poor moisture resistance [J. Hazard. Mater.395(2020) 122628], so the development of advanced supported noble metal catalyst design concept and controllable synthesis method is still the key problem to be solved in the process of promoting the practical application of formaldehyde catalytic oxidation technology

Method used

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  • Supported noble metal catalyst based on amorphization combined with cationic doping modification, preparation method and application
  • Supported noble metal catalyst based on amorphization combined with cationic doping modification, preparation method and application
  • Supported noble metal catalyst based on amorphization combined with cationic doping modification, preparation method and application

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Embodiment 1

[0038] (1) Catalyst preparation:

[0039] Pt / a-Fe 0.08 WO x Catalyst synthesis: 2.0mmol Fe(acac) 3 , 0.015mmol Pt(acac) 2 and 0.20mmol W(CO) 6 Disperse in 10mL of EG, put it into a 30ml polytetrafluoroethylene reaction kettle after ultrasonication and stirring for 1 hour, and cool to room temperature naturally after a constant temperature reaction at 120°C for 36 hours. Ultrapure water, absolute ethanol and acetone cleaning), after drying, the target catalyst Pt / a-Fe was obtained 0.08 WO x .

[0040] (2) Phase / structure / element chemical state characterization of the catalyst:

[0041] Catalyst Pt / a-Fe obtained in the present embodiment 0.08 WO x The X-ray diffraction and selected area electron diffraction patterns of figure 1 and figure 2 (b) shown. Combined with XRD and selected area electron diffraction analysis, the prepared catalyst Pt / a-Fe 0.08 WO x is an amorphous phase. Transmission electron microscope observation ( figure 2 (a)) found that the Pt / a-Fe...

Embodiment 2

[0047] (1) Catalyst preparation:

[0048] In the synthetic method of the present embodiment, only Pt(acac) 2 Replaced with Pd(acac) 2 , all the other preparation conditions are consistent with Example 1.

[0049] (2) Phase / structural characterization of the catalyst:

[0050] Catalyst Pd / a-Fe obtained in the present embodiment 0.08 WO x X-ray diffraction such as Figure 6 shown. According to XRD analysis, the prepared catalyst Pd / a-Fe 0.08 WO x is an amorphous phase.

[0051] Transmission electron microscope observation ( Figure 7 a) It is found that the structure of the catalyst is consistent with that of Example 1, which is the morphology of nanosheets. In addition, according to high-angle annular dark field-scanning transmission electron microscopy analysis ( Figure 7 b), a large number of Pd nanocrystals are dispersed and distributed on the surface of the nanosheet, and the size is about 1-2 nm.

[0052] (3) target catalyst Pd / a-Fe obtained in the present emb...

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Abstract

The invention belongs to the technical field of catalytic materials, and discloses a supported noble metal catalyst based on amorphization combined with cationic doping modification, a preparation method and an application. The catalyst is composed of a noble metal active phase and a cation-doped amorphous iron oxide carrier phase, and the noble metal active phase is dispersed and distributed on the surface of the oxide carrier phase in the form of fine nanoparticles. The present invention improves the oxygen defect content of the oxide carrier through cation doping combined with amorphization, and then combines with the finely dispersed noble metal active phase on the carrier to construct a synergistic catalytic active site; in addition, the ultra-thin nanosheet structure can effectively improve the dispersion of noble metals. At the same time, the mass transfer performance of the catalyst can be further improved. Based on this, the comprehensive performance of the supported noble metal catalysts modified by amorphization combined with cation doping 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 specifically relates to a supported noble metal catalyst based on amorphization combined with cationic doping modification, a preparation method and an application. Background technique [0002] Formaldehyde is one of the most common indoor air pollutants. Because of its high chemical reactivity that can cause denaturation of biomass by reacting with proteins and other biomass in the body, long-term exposure to environments containing low concentrations of formaldehyde can cause chronic poisoning, and even Cause serious diseases such as nasopharyngeal carcinoma and leukemia, and cause serious harm to human health. Therefore, it is of great significance to research and develop safe and efficient formaldehyde control technology. Among the existing formaldehyde purification technologies, the catalytic oxidation method can completely catalyze the oxidation of formaldehyde to carbon d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J35/02B01D53/86B01D53/72B01J35/00
CPCB01J23/8993B01D53/8668B01J23/002B01J35/40
Inventor 王平陈木华
Owner SOUTH CHINA UNIV OF TECH
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