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Transition metal complex nano-catalyst and preparation method and application thereof

A transition metal, nanocomposite technology, applied in physical/chemical process catalysts, chemical instruments and methods, non-metallic elements, etc., can solve problems such as weak functionality, achieve simple preparation methods, high yields, and improve uniform dispersion. Effect

Inactive Publication Date: 2018-07-06
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a transitional catalyst with high catalytic selectivity and stability, which can effectively improve the reversible hydrogen storage capacity of the coordination hydride composite system, in view of the shortcomings of the commonly used two-dimensional carbon material carrier itself, such as its weak functionality. Metal three-dimensional nanocomposite catalyst and its preparation method and application

Method used

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  • Transition metal complex nano-catalyst and preparation method and application thereof
  • Transition metal complex nano-catalyst and preparation method and application thereof
  • Transition metal complex nano-catalyst and preparation method and application thereof

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preparation example Construction

[0035] Preparation of Metal Organic Framework MOF-74-M:

[0036] MOF-74-Ni: Dissolve 0.478g of 2,5-dihydroxyterephthalic acid and 2.378g of nickel nitrate hexahydrate in ethanol (70ml), water (70ml), N, in a mixed solution of N-dimethylformamide (70ml) until it was completely dissolved. The dissolved solution was transferred to a glass bottle, placed in an oven at 110°C and kept warm for 24 hours. The precipitate produced by the reaction was removed, washed with methanol, soaked for 4 hours, and the supernatant was poured out and separated, and repeated 4 times. Then place the precipitate in the bottle in an oven at 110° C. and keep it warm for 3 hours to dry. Finally, the dried powder was vacuum-treated at 180°C for 2 hours and cooled naturally, and the powder was collected to obtain MOF-74-Ni.

[0037] MOF-74-Co: Dissolve 0.478g of 2,5-dihydroxyterephthalic acid and 2.377g of cobalt nitrate hexahydrate in ethanol (70ml), water (70ml), N, in a mixed solution of N-dimethyl...

Embodiment 1

[0040] (1) Using urea as a precursor, calcining at 550°C for 0.5 hours to prepare lamellar g-C 3 N 4 ;

[0041] (2) The metal-organic framework MOF-74-Ni was carbonized at a high temperature of 700°C under argon gas, and the carbonization time was 0.5 hours, and carbon-supported transition metal Ni nanoparticles were synthesized in situ;

[0042] (3) At an ambient temperature of 25°C, 1g g-C 3 N 4 and 1 g of transition metal Ni nanoparticles were added into 10 mL of absolute ethanol, and stirred at a constant speed of 400 r / min for 1 hour to form a uniform suspension.

[0043] (4) The homogeneously stirred suspension was subjected to ultrasonic treatment for 0.5 h, and then vacuum-dried at 80° C. for 4 hours until the ethanol was completely volatilized to obtain a black viscous substance.

[0044] (5) Continue to heat up the black viscous substance to 150°C and keep it warm for 2 hours to obtain lamellar g-C 3 N 4 The Ni nanoparticle composite catalyst loaded with transi...

Embodiment 2

[0047] (1) Using urea as a precursor, calcining at 550°C for 0.5 hours to prepare lamellar g-C 3 N 4 ;

[0048] (2) The metal-organic framework MOF-74-Co was carbonized at a high temperature of 700°C under nitrogen, and the carbonization time was 0.5 hours, and carbon-supported transition metal Co nanoparticles were synthesized in situ;

[0049] (3) At an ambient temperature of 25°C, 1g g-C 3 N 4 and 1 g of transition metal Co nanoparticles were added to 10 mL of absolute ethanol, and stirred at a constant speed of 400 r / min for 1 hour to form a uniform suspension.

[0050] (4) The homogeneously stirred suspension was subjected to ultrasonic treatment for 0.5 h, and then vacuum-dried at 80° C. for 4 hours until the ethanol was completely volatilized to obtain a black viscous substance.

[0051] (5) Continue to heat up the black viscous substance to 150°C and keep it warm for 2 hours to obtain lamellar g-C 3 N 4 The transition metal Co nanoparticle composite catalyst supp...

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Abstract

The invention discloses a transition metal complex nano-catalyst. The transition metal complex nano-catalyst comprises transition metal nanoparticles and a carrier, wherein the loading capacity of thetransition metal nanoparticles is 5-50%; and the carrier is g-C3N4. The preparation method comprises the following steps: (1) preparing urea as a precursor; and roasting under the temperature of 500-600 DEG C to obtain lamella shaped g-C3N4; (3) carbonizing a metal organic frame MOF-74-M under the temperature of 600-800 DEG C in protection atmosphere; and performing in-situ synthesizing on the carbon loaded transition metal nanoparticles, wherein M is Fe, Co or Ni; and (3) adding the transition metal nanoparticles and g-C3N4 to a solvent; and processing by stirring, ultrasonic wave and removing solvent to obtain the transition metal complex nano-catalyst. According to the method, the transition metal nanoparticles are loaded on the lamella shaped g-C3N4, so that the catalytic hydrogen production effect is improved; and the catalyst can be widely applied to the catalyzing field.

Description

technical field [0001] The invention belongs to the application field of hydrogen storage materials, and in particular relates to a transition metal nanocomposite catalyst and its preparation method and application. Background technique [0002] Energy is the foundation of the development of human society. With the increasing scarcity of fossil energy and the continuous deterioration of the living environment, the development of new energy technologies using hydrogen as the energy carrier has become the consensus of all countries. Hydrogen storage is the key to the development of hydrogen energy economy. The research and development of new hydrogen storage composite materials related to fuel cell hydrogen source system has received extensive attention. Various new hydride hydrogen storage materials composed of light elements, such as borohydride, aluminum hydride and amino compounds, have high theoretical hydrogen storage capacity, which brings new hope for breakthroughs in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/00
CPCB01J27/24C01B3/0005Y02E60/32
Inventor 肖学章黄旭陈立新王宣程
Owner ZHEJIANG UNIV
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