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Preparation method and application of nanoscale Co3O4 (at) Pt

A nano-scale, nano-particle technology, which is applied in the preparation of carboxylate, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problem of affecting the catalytic activity and cycle stability of catalysts, different sizes, weak interaction, etc. problem, to achieve good flexibility and adaptability, low cost and short time

Pending Publication Date: 2022-03-11
SHANDONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, nanoscale Co 3 o 4 As a carrier, Pt is used as a catalyst in the report of HCHO catalytic oxidation at room temperature. Most of them are prepared by impregnation method, co-precipitation and other methods. Co 3 o 4 In the Pt-loaded heterojunction, the Pt particles are randomly distributed on the Co 3 o 4 The surface of the carrier has different sizes and uneven distribution, and is loaded on the carrier in the form of physical adsorption, and the interaction force with the carrier is weak
Pt nanoparticles are prone to agglomeration, which affects the catalytic activity and cycle stability of the catalyst
At the same time, the preparation method adopted in the Chinese patent "a carbon composite nano-cobalt tetroxide-based formaldehyde catalyst at room temperature and its preparation method" (CN111359625A) involves a calcination process, which consumes energy and time, and the steps are cumbersome

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  • Preparation method and application of nanoscale Co3O4 (at) Pt
  • Preparation method and application of nanoscale Co3O4 (at) Pt
  • Preparation method and application of nanoscale Co3O4 (at) Pt

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preparation example Construction

[0023] In the first aspect of the present disclosure, there is provided a nanoscale Co 3 o 4 @Pt redox preparation method, including: to nano-scale Co 3 o 4 Adding a solution containing Pt in a non-zero oxidation state, a redox reaction occurs between Co(II) and Pt in a high oxidation state, so that the reduction product Pt nanoparticles are loaded on the nanoscale Co 3 o 4 s surface.

[0024] In a typical embodiment, the solution containing Pt in a non-zero oxidation state is a chloroplatinic acid solution, and its solution concentration is 0.5-2 mg / L; further, chloroplatinic acid and nano-scale Co 3 o 4 The mass ratio is 1:30~100.

[0025] In a typical implementation, the preparation method is specifically: to the prepared Co 3 o 4 Add H to the suspension 2 PtCl 6 ·6H 2 After the O solution was mixed evenly, the Co was obtained after separation, washing and drying. 3 o 4 @Pt heterojunction nanomaterials.

[0026] Further, the loading amount of Pt is 0.4wt%-1wt%...

Embodiment 1

[0056] (1) 0.05g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 0.02g of urea were dissolved in 3.5mL of ethylene glycol and 13.5mL of distilled water mixed in a homogeneous solution, vigorously stirred for 2 hours;

[0057] (2) Put it into a 30mL polytetrafluoroethylene autoclave. Then put the polytetrafluoroethylene reaction kettle in a digital display blast drying oven at 180°C, and conduct a hydrothermal reaction for 40 minutes;

[0058] (3) Naturally cool to room temperature, wash with deionized water and ethanol three times respectively, and finally put the washed product into an oven at 80° C. to dry overnight;

[0059] (4) The precursors prepared above were calcined and placed in air at 400 °C at a heating rate of 2 °C / min for 2 hours to obtain rod-shaped Co 3 o 4 .

Embodiment 2

[0061] (1) 0.0728g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 10 mL of deionized water, then slowly add 10 mL of 0.1M NH 3 ·H 2 O, the color changed from pink to blue, stirred on a magnetic stirrer for 15min and mixed evenly, then turned dark green, then washed the precipitate with deionized water and centrifuged for 6 times, then added 20mL (V 甲醇 :V 水 =1:1) methanol aqueous solution, finally add 0.3g NaNO 3 Mix evenly and transfer to polytetrafluoroethylene reactor;

[0062] (2) Put the polytetrafluoroethylene reaction kettle in a 220°C digital display blast drying oven, and perform a hydrothermal reaction for 27 hours;

[0063] (3) After naturally cooling to room temperature, pour out the supernatant in the reaction kettle to obtain a black precipitate; respectively wash and centrifuge 3 times with deionized water and ethanol ultrasonically;

[0064] (4) Finally, put the washed product in an oven at 60°C and dry it overnight to obtain spherical Co 3...

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Abstract

The invention relates to a nanoscale Co3O4 (at) Pt oxidation-reduction preparation method, which comprises the following steps: adding a solution containing non-zero oxidation state Pt into nanoscale Co3O4, carrying out oxidation-reduction reaction between Co (II) and high oxidation state Pt, and loading reduction product Pt nanoparticles on the surface of the nanoscale Co3O4. Pt particles in the prepared catalyst have excellent dispersity on a Co3O4 carrier with a large surface area, adsorption of gaseous formaldehyde molecules is enhanced through interaction between the carrier and metal, and the HCHO catalyst formed by loading the Pt nanoparticles with nanoscale Co3O4 as the carrier can be subjected to catalytic oxidation at room temperature under air conditions, so that the catalyst can be applied to the field of catalytic oxidation of formaldehyde. The HCHO catalytic efficiency of the rod-like Co3O4 (at) Pt catalyst can reach 100%.

Description

technical field [0001] The invention relates to the technical field of formaldehyde purification, in particular to a nanoscale cobalt tetroxide supported platinum (Co 3 o 4 @Pt) redox preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In the prior art, nanoscale Co 3 o 4 As a carrier, Pt is used as a catalyst in the report of HCHO catalytic oxidation at room temperature. Most of them are prepared by impregnation method, co-precipitation and other methods. Co 3 o 4 In the Pt-loaded heterojunction, the Pt particles are randomly distributed on the Co 3 o 4 The surface of the carrier has different sizes and uneven distribution, and is l...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/10C07C51/235C07C53/02
CPCB01J23/8913C07C51/235B01J35/61C07C53/02
Inventor 李志华李阳曾池源赵田瑞王泽颖付衍飞
Owner SHANDONG NORMAL UNIV
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