Carbon-supported metal catalyst and preparation method thereof

A metal catalyst, catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve the problems of difficult scale, complex process, strict condition control requirements, etc.

Inactive Publication Date: 2010-01-06
DALIAN JIAOTONG UNIVERSITY
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Problems solved by technology

[0004] However, in the current carbon-supported catalysts, the particle size control of the metal active components is mostly carried out by the liquid phase method, and the high dispersion of the active components is achieved by means of surfactants and dispersants. The use of organic reagents not only makes the process complicated, but also Strict control of conditions makes it difficult to scale up, so further optimization of synthetic methods is particularly important

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  • Carbon-supported metal catalyst and preparation method thereof
  • Carbon-supported metal catalyst and preparation method thereof

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preparation example Construction

[0019] A carbon-supported metal catalyst, characterized in that: the active metal is one or more transition metal elements including iron, cobalt, ruthenium, rhodium, palladium, osmium, iridium, platinum, copper, silver, gold , the content of the metal component in the carbon-supported metal catalyst can be precisely adjusted in the range of 1-50 wt%. Its preparation method comprises the synthetic process of catalyst and self-reduction process, is characterized in that comprising the following steps:

[0020] (1) The metal salt is configured into a solution with a certain concentration and placed in a continuously stirred reactor as a salt precursor. After stirring evenly, an anion resin or the same Proportional cation resin is added to it, and the temperature in the reactor is controlled not to exceed 40°C to carry out ion exchange reaction;

[0021] (2) After the ion exchange reaction, filter at room temperature, remove the filtrate, collect the filtrate, and dry it at 80°C...

Embodiment 1

[0025] Preparation of Ag / C catalyst: silver nitrate (AgNO 3 ) 0.5g was dissolved in 50ml of deionized water at 40°C, 20ml of hydrogen-form cation exchange resin was added to the continuously stirred silver nitrate solution, stirred continuously at 40°C for 2 hours, filtered and dried at 80°C for 24 hours. After cooling, it is placed in a tube furnace, the flow rate of inert gas is 20ml / min, the heating rate is 5° / min, the temperature is kept at 500°C for 2 hours, and then it is lowered to room temperature.

Embodiment 2

[0027] Preparation of Pt / C catalyst: chloroplatinic acid (H 2 PtCl 6 .6H 2 (0) 0.5g, dissolved in 50ml of 40°C deionized water, 20ml of hydroxide type anion exchange resin was added to the continuously stirred chloroplatinic acid solution, stirred continuously at 40°C for 2 hours, filtered and dried at 80°C for 24 hours. After cooling, put it in a tube furnace, the flow rate of inert gas is 20ml / min, the heating rate is 5° / min, keep the temperature at 500°C for 2h, and then cool down to room temperature.

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Abstract

The invention discloses a carbon-supported metal catalyst and a preparation method thereof. The metal catalyst takes a transition metal element as an active metal, and the content of the metal component is accurate and adjustable within the range of 1-50wt%. The preparation method mainly comprises the following steps: (1) preparing salt precursor solution and placing in a reactor with continuously stirring; (2) adding negative resin which forms a certain proportion with metal content in the salt precursor or positive resin with the same proportion in the reactor for carrying out ion exchange reaction and controlling the temperature not to exceed 40 DEG C; (3) carrying out filtration on the solution of ion exchange reaction at room temperature, collecting filtered materials and drying at 80 DEG C; and (4) placing the dried filter materials in a tube furnace, increasing the temperature to 500 DEG C for baking under the protection of helium and nitrogen inert gas flow, keeping the temperature for a certain period of time and cooling to room temperature. The method removes impurities by synthesis process and self-reduction process of the catalyst and realizes metallization of the active component and high dispersion.

Description

technical field [0001] The invention relates to a carbon-supported metal catalyst and a preparation method thereof. Catalysts for fuel cells. Background technique [0002] Both theoretical and experimental studies have shown that nano-sized metal particles have a small size effect, so the electronic properties of nano-sized catalyst particles and the metal-support interaction have a great influence on their catalytic performance. [0003] In fuel cell technology, low-temperature fuel cells using proton exchange membranes, including hydrogen-oxygen fuel cells (PEMFC) using hydrogen and oxygen as fuel and methanol fuel cells (DMFC) directly using liquid methanol as fuel, because of their environmental friendliness , No pollution, and quick start at low temperature have attracted the attention of researchers in recent years. Carbon-supported Pt-Ru / C or Pt-Ru-M / C (M is Mo, W and other elements) is considered to be the most active and long-lived anode catalyst for hydrogen oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/745B01J23/72B01J23/52B01J23/50B01J23/46B01J23/42B01J37/30B01J37/16B01J37/08H01M4/90H01M4/92
Inventor 朱少敏姜玉玲曹魁李彦生张大珉张秋双
Owner DALIAN JIAOTONG UNIVERSITY
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