Nano-Pd/M-rGO composite catalyst and preparation method thereof

A composite catalyst and nanotechnology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of catalyst catalytic activity and stability reduction, catalyst specific surface area reduction, etc., to improve activity and stability, and the effect of improving catalytic performance

Active Publication Date: 2019-03-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the preparation of catalysts supported by graphene oxide GO, metal particles and graphene oxide GO are easy to agglomerate, which

Method used

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  • Nano-Pd/M-rGO composite catalyst and preparation method thereof
  • Nano-Pd/M-rGO composite catalyst and preparation method thereof
  • Nano-Pd/M-rGO composite catalyst and preparation method thereof

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Embodiment 1

[0052] Embodiment 1: In this embodiment, the nano-Pd / M-rGO composite catalyst is a nano-Pd / Ni-rGO composite catalyst, wherein rGO is reduced graphene oxide, and the loading of Pd is 20% of the composite catalyst mass;

[0053] The preparation method of the present embodiment nano-Pd / Ni-rGO composite catalyst, concrete steps are as follows:

[0054] (1) Add graphene oxide to N,N-dimethylformamide for ultrasonic exfoliation for 1.5h to obtain graphene oxide suspension; the concentration of graphene oxide suspension is 2mg / mL;

[0055] (2) The transition metal nickel salt solution (NiSO 4 Solution) and the graphene oxide suspension in step (1) were mixed evenly, and the temperature was 190 °C, hydrothermal reaction for 24 hours, cooled to room temperature, filtered, washed, freeze-dried, and then placed at a temperature of 850 °C in an Ar atmosphere The Ni-rGO composite was obtained by constant temperature treatment for 2 h; the transition metal salt solution (NiSO 4 solution) ...

Embodiment 2

[0075] Embodiment 2: In this embodiment, the nano-Pd / M-rGO composite catalyst is a nano-Pd / Co-rGO composite catalyst, wherein rGO is reduced graphene oxide, and the loading capacity of Pd is 17% of the composite catalyst mass;

[0076] The preparation method of the present embodiment nanometer Pd / Co-rGO composite catalyst, concrete steps are as follows:

[0077] (1) Add graphene oxide to N,N-dimethylformamide for ultrasonic exfoliation for 3 hours to obtain a graphene oxide suspension; the concentration of the graphene oxide suspension is 1 mg / mL;

[0078] (2) The transition metal cobalt salt solution (Co(NO 3 ) 2 solution) and the graphene oxide suspension in step (1) were evenly mixed, reacted at a temperature of 170 °C for 16 hours under stirring conditions, cooled to room temperature, filtered, washed, freeze-dried, and then placed at a temperature of 700 °C under Ar gas Constant temperature treatment under atmosphere for 1.5h obtains Co-rGO composite material; wherein t...

Embodiment 3

[0085] Embodiment 3: nanometer Pd / M-rGO composite catalyst is nanometer Pd / Fe-rGO composite catalyst in the present embodiment, and wherein rGO is reduced graphene oxide, and the loading capacity of Pd is 19% of composite catalyst quality;

[0086] The preparation method of the nanometer Pd / Fe-rGO composite catalyst of this embodiment, the specific steps are as follows:

[0087] (1) Add graphene oxide to N,N-dimethylformamide for ultrasonic exfoliation for 2.5 hours to obtain graphene oxide suspension; the concentration of graphene oxide suspension is 0.8mg / mL;

[0088] (2) Transition metal iron salt solution (FeCl 2 solution) and the graphene oxide suspension in step (1) were evenly mixed, reacted at 170°C for 18 hours under stirring conditions, cooled to room temperature, filtered, washed, freeze-dried, and then placed at 600°C under Ar gas The Fe-rGO composite was obtained by constant temperature treatment for 1.8 h in the atmosphere; the transition metal iron salt solutio...

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Abstract

The invention relates to a nano-Pd/M-rGO composite catalyst and a preparation method thereof, and belongs to the technical field of nano-catalysts. The preparation method includes the steps: adding graphene oxide into N, N-dimethylformamide to ultrasonically strip mixture for 0.5-4 hours to obtain graphene oxide suspension liquid; uniformly mixing transition metal salt solution and the graphene oxide suspension liquid, performing reaction for 12-24 hours at the temperature of 160-200 DEG C in a stirred manner, cooling mixture to reach indoor temperature, filtering, washing and freeze-drying the mixture, and treating the mixture for 1-2 hours at the atmosphere temperature of 600-900 DEG C in Ar atmosphere to obtain an M-rGO composite material; uniformly mixing acetone, polyethylene glycol and Na2PdCl4 solution, and performing ultraviolet irradiation for 10-30 minutes to obtain a Pd nano-colloid; uniformly mixing the M-rGO composite material and the Pd nano-colloid to ultrasonically treat mixture for 10-15 minutes, continuing to stir the mixture for 3-5 hours, and filtering, washing and freeze-drying the mixture to obtain the nano-Pd/M-rGO composite catalyst. The Pd/M-rGO catalyst has the advantages of good dispersibility and stability and excellent catalytic activity.

Description

technical field [0001] The invention relates to a nano Pd / M-rGO composite catalyst and a preparation method thereof, belonging to the technical field of nano catalysts. Background technique [0002] A fuel cell is an energy conversion device that directly converts chemical energy stored in fuel and oxidant into electrical energy. Because the fuel cell directly converts chemical energy into electrical energy without going through the heat engine process and is not limited by the Carnot cycle, it has the advantages of high energy conversion efficiency, no noise and no pollution, and is becoming an ideal energy utilization method. Pt and Pt-based catalysts have high electrocatalytic activity, but the catalytic activity and stability of Pt and Pt-based catalysts are reduced due to the high price of Pt and its susceptibility to poisoning by CO-like intermediates in the catalytic process. In order to reduce the loading of Pt, many researchers began to replace Pt with Pd. Graphen...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J37/10B01J37/34B01J37/16B82Y30/00B82Y40/00
CPCB01J23/44B01J37/10B01J37/16B01J37/343B01J37/345B82Y30/00B82Y40/00
Inventor 徐明丽和秋谷张英杰李雪董鹏杨喜昆林艳张呈旭周忠仁
Owner KUNMING UNIV OF SCI & TECH
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