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A method for preparing supported palladium catalysts using different precursor photochemical methods

A palladium catalyst, photochemical technology, applied in electrochemical generators, fuel cells, structural parts, etc., can solve the problems of affecting catalyst performance, cumbersome process, single nature, etc., to achieve short cycle, simple process, good load dispersion Effect

Active Publication Date: 2019-09-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing photochemical reduction can prepare single-metal catalysts (Shouan Dong et al, materialsSciences and Engineering, 2007, 140:153-159) and multi-component metal catalysts (YangyangXu et al, Catalysis Communications, 2011,13:54-58 ), the prepared catalyst has good catalytic performance, and the precursor in the preparation process is H 2 PtCl 6 Such acidic solutions have single properties, making it impossible to add components that are incompatible with acidic conditions when preparing multi-component metal catalysts
In the preparation process, the precursor is first reduced, and then loaded on the carbon nanotubes. This process is a bit cumbersome, and the metal particles are also prone to agglomeration after reduction, which affects the performance of the catalyst.

Method used

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  • A method for preparing supported palladium catalysts using different precursor photochemical methods
  • A method for preparing supported palladium catalysts using different precursor photochemical methods
  • A method for preparing supported palladium catalysts using different precursor photochemical methods

Examples

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Embodiment 1

[0024] The method of using different precursor photochemical methods to prepare supported palladium catalysts, the specific steps are as follows:

[0025] (1) First, soak 250mg of carbon nanotubes (with a diameter of 20-40nm) in 100ml of acetone and stir for 3.5 hours, wash with double distilled water, and filter with 80ml, 1.0mol / L NaOH solution and continue to stir for 2 hours, then use Washing with double distilled water and suction filtration; the soaked carbon nanotubes were washed with 1mol / LNH 4 The F solution was stirred for 6 hours, then washed with twice distilled water, suction filtered, and vacuum-dried at a constant temperature of 60°C in a vacuum drying oven for 12 hours; 4 F modified carbon nanotubes;

[0026] (2) Preparation of Pd precursor: with 55mgPdCl 2 As raw material, dissolve in excess NaCl solution (50ml, concentration 2mol / L), dilute to 100ml with deionized water to obtain Na 2 PdCl 4 Precursor (solution concentration is 3mmol / L);

[0027] (3) Pre...

Embodiment 2

[0029] The method of using different precursor photochemical methods to prepare supported palladium catalysts, the specific steps are as follows:

[0030] (1) First, soak 250mg of carbon nanotubes (with a diameter of 40-60nm) in 50ml of acetone and stir for 4 hours, wash with twice distilled water, filter with suction, soak in 80ml, 1.0mol / L NaOH solution and continue to stir for 4 hours, then use two Sub-distilled water cleaning, suction filtration; soaked carbon nanotubes with 1mol / LNH 4 The F solution was stirred for 6 hours, then washed with twice distilled water, suction filtered, and vacuum-dried at a constant temperature of 60°C in a vacuum drying oven for 12 hours; 4 F modified carbon nanotubes;

[0031] (2) Preparation of Pd precursor: with 55mgPdCl 2 As a raw material, dissolve in excess ammonia water (20ml, concentration 14mol / L), dilute to 100ml with deionized water to obtain (NH) 2 PdCl 4 Precursor (solution concentration is 3mmol / L);

[0032] (3) Preparation...

Embodiment 4

[0040] The method of using different precursor photochemical methods to prepare supported palladium catalysts, the specific steps are as follows:

[0041] (1) First, soak 250mg of carbon nanotubes (with a diameter of 40-60nm) in 50ml of acetone and stir for 4 hours, wash with twice distilled water, filter with suction, soak in 80ml, 1.0mol / L NaOH solution and continue to stir for 4 hours, then use two Sub-distilled water cleaning, suction filtration; soaked carbon nanotubes with 1mol / LNH 4 The F solution was stirred for 6 hours, then washed with twice distilled water, suction filtered, and vacuum-dried at a constant temperature of 60°C in a vacuum drying oven for 12 hours; 4 F modified carbon nanotubes;

[0042] (2) Preparation of Pd precursor: with 55mgPdCl 2 As a raw material, dissolve in excess ammonia water (20ml, concentration 14mol / L), dilute to 100ml with deionized water to obtain (NH) 2 PdCl 4 Precursor (solution concentration is 3mmol / L);

[0043] (3) Preparation...

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Abstract

The invention relates to a method for preparing a supported palladium catalyst by using different precursors through a photochemistry method and belongs to the field of catalyst preparation technologies. The method comprises the following steps of respectively soaking a carbon nanotube into acetone and a NaOH solution, stirring the soaked carbon nanotube by NH4F solution of 1 mol / L for 6 hours, and naturally cooling to the room temperature after vacuum drying to obtain a carbon nanotube after modified treatment; and preparing a Pd precursor; uniformly mixing the obtained Na2PdCl4 or (NH)2PdCl4 precursor, acetone and polyethylene glycol-400 and diluting to obtain a mixed solution, carrying out ultrasonic treatment on the carbon nanotube after modified treatment and the mixed solution for 5 minutes, continuously stirring for 3-6 hours, irradiating under the ultraviolet light in a stirring process, and lastly, cleaning through distilled water, carrying out vacuum filtration and drying to obtain the supported palladium catalyst. The method combines precursor reduction and loading into one step, the process is simplified while the load dispersity of Pd nanoparticles is better, and furthermore, through Na2PdCl4 and (NH)2PdCl4 two precursors, the PH regulating range of the solution is larger.

Description

technical field [0001] The invention relates to a method for preparing a loaded palladium catalyst by using different precursor photochemical methods, and belongs to the technical field of catalyst preparation. Background technique [0002] With the growth of population and the development of economy, human beings' requirements for energy are gradually increasing, and energy crisis and environmental pollution have become two major issues of global concern. For this reason, how to improve the energy utilization rate is an imminent task. Among many candidates, direct methanol fuel cells (DMFCs) have become a research hotspot in the field of energy due to their advantages such as high energy conversion, low operating temperature, and less environmental pollution. It is widely used in the fields of automobile power supply, portable mobile power supply, artificial satellite and spacecraft power supply, etc. Considered to be the most promising portable power supply device. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92H01M8/1011
CPCH01M4/88H01M4/8817H01M4/921H01M4/926H01M8/1011Y02E60/50
Inventor 徐明丽张英杰董鹏段奔杨喜昆张晓凤靳振华
Owner KUNMING UNIV OF SCI & TECH
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