Carbon nitride loaded Pd-based catalyst as well as preparation method and application thereof

A carbon nitride and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as easy to produce attachments, limited catalyst output, and affect catalyst preparation process

Inactive Publication Date: 2020-05-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Description
  • Claims
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Problems solved by technology

However, the preparation process of many of the above-mentioned Pd-based nanocatalysts is cumbersome, and usually requires the use of polyols, citric a

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  • Carbon nitride loaded Pd-based catalyst as well as preparation method and application thereof
  • Carbon nitride loaded Pd-based catalyst as well as preparation method and application thereof
  • Carbon nitride loaded Pd-based catalyst as well as preparation method and application thereof

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preparation example Construction

[0034] The invention provides a kind of preparation method of the Pd-based catalyst supported by carbon nitride, comprising the following steps:

[0035] A) pyrolyzing thiocyanic acid under a protective gas atmosphere to obtain a thin layer of carbon nitride;

[0036] The temperature of the pyrolysis is 500-650°C; the time of the pyrolysis is 60-120min;

[0037]B) dispersing the thin layer of carbon nitride in water to obtain a first suspension;

[0038] C) adding the Pd precursor to the first suspension and stirring to obtain a second suspension;

[0039] D) adding sodium hydroxide to the second suspension, adjusting the pH to 10-12, and stirring for 10-40 minutes to obtain the third suspension;

[0040] E) Add sodium borohydride to the third suspension, stir to obtain the fourth suspension, continue stirring for 4 to 8 hours, separate the fourth suspension from solid to liquid, and dry the obtained solid to obtain carbon nitride Supported Pd-based catalysts.

[0041] In ...

Embodiment 1

[0065] Put 2g of thiocyanuric acid in a corundum boat with a cover, put the corundum boat in a muffle furnace, and pyrolyze it at 600°C for 1h under a nitrogen atmosphere to obtain a thin-layer carbon nitride support;

[0066] Add 95mg of thin-layer carbon nitride carrier to 90ml of deionized water, and disperse evenly by ultrasonic to obtain a homogeneous suspension 1;

[0067] 0.85mlH 2 PdCl 4 The solution (5.9mg / ml) was added to the suspension 1 to obtain the suspension 2, which was stirred for 2h;

[0068] Adjust the pH of the solution to 10.8 with a freshly prepared 1mol / L NaOH solution to obtain a homogeneous suspension 3;

[0069]Add 5ml of sodium borohydride solution (1mg / ml) into the above suspension 3, and keep it at room temperature for more than 4h to obtain suspension 4, which is suction filtered, washed with water, and dried to obtain Pd with uniform particle size. Nano-catalyst (denoted as Pd / C 3 N 4 -S-10.8).

[0070] The Pd nano-catalyst of embodiment 1 ...

Embodiment 2

[0073] Put 2g of thiocyanuric acid in a corundum boat with a cover, put the corundum boat in a muffle furnace, and pyrolyze it at 550°C for 2h under a nitrogen atmosphere to obtain a thin-layer carbon nitride support;

[0074] Add 95mg of thin-layer carbon nitride carrier to 90ml of deionized water, and disperse evenly by ultrasonic to obtain a homogeneous suspension 1;

[0075] 0.85mlH 2 PdCl 4 Solution (5.9mg / ml) was added to suspension 1 to obtain suspension 2, stirred for 2h,

[0076] Adjust the pH of the solution to 11 with a freshly prepared 1mol / L NaOH solution to obtain a homogeneous suspension 3;

[0077] Add 5ml of sodium borohydride solution (1mg / ml) into the above suspension 3, and keep it at room temperature for more than 4h to obtain suspension 4, which is suction filtered, washed with water, and dried to obtain Pd with uniform particle size. nanocatalyst.

[0078] The Pd nano-catalyst of Example 2 was observed by transmission electron microscope, and its par...

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Abstract

The invention provides a preparation method of a carbon nitride loaded Pd-based catalyst, which comprises the following steps: A) pyrolyzing trithiocyanuric acid in a protective gas atmosphere to obtain thin-layer carbon nitride; b) dispersing the thin-layer carbon nitride in water to obtain a first turbid liquid; c) adding a Pd precursor into the first turbid liquid, and stirring to obtain a second turbid liquid; d) adding sodium hydroxide into the second turbid liquid, and stirring to obtain a third turbid liquid; and E) adding sodium borohydride into the third turbid liquid, stirring to obtain a fourth turbid liquid, and carrying out solid-liquid separation on the fourth turbid liquid to obtain the carbon nitride loaded Pd-based catalyst. Nano metal particles in the catalyst prepared bythe method are uniformly distributed on a carrier, have good interaction stability, and the catalyst shows excellent activity and selectivity for hydrogen production by formic acid decomposition. Theinvention also provides the carbon nitride-loaded Pd-based catalyst and an application of the catalyst in hydrogen production by formic acid decomposition.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a Pd-based catalyst supported by carbon nitride, its preparation method and application. Background technique [0002] Since the first industrial revolution, fossil energy has become the main energy source for the development of our society. The rapid depletion of energy resources due to the growing demand for energy in both developed and developing countries is consistent with shortages of key raw materials for many important man-made chemicals, such as pesticides, pharmaceuticals, solvents, fertilizers, and plastics. At the same time, through the burning of fossil fuels, a large amount of carbon dioxide is released into the atmosphere, changing the combination of the natural carbon cycle, thus causing another serious environmental problem of global warming. In order to alleviate the energy crisis, mitigate climate change, and reduce the use and depende...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J35/02C01B3/22
CPCB01J27/24B01J35/023B01J35/1004C01B3/22
Inventor 邢巍孙志聪刘长鹏葛君杰梁亮李晨阳金钊刘世伟张弘侯帅
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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