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Nitrogen and phosphorus doped porous carbon-rhodium phosphide catalyst as well as preparation method and application thereof

A technology of rhodium catalyst and porous carbon, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of complex synthesis steps, inability to synthesize on a large scale, and difficulty in large-scale synthesis, etc. Achieve the effect of simple synthesis method, easy promotion and industrialization, and uniform size

Inactive Publication Date: 2018-11-06
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Metal phosphides exhibit excellent stability and catalytic activity, but the current metal phosphides are in the laboratory stage, and it is difficult to synthesize them on a large scale
Metal Ru2 and Rh2P have properties comparable to those of commercial Pt / C catalysts. For example, Mr. Li Yadong of Tsinghua University synthesized a kind of Rh2P. Under acidic conditions, Rh2P synthesized by this method has better catalytic performance than commercial Pt / C catalysts, but Because the synthesis steps are relatively complicated and cannot be synthesized on a large scale, it is still in the laboratory stage, so it is urgent to find a large-scale green and simple synthesis method to prepare high-performance phosphating catalysts

Method used

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  • Nitrogen and phosphorus doped porous carbon-rhodium phosphide catalyst as well as preparation method and application thereof
  • Nitrogen and phosphorus doped porous carbon-rhodium phosphide catalyst as well as preparation method and application thereof
  • Nitrogen and phosphorus doped porous carbon-rhodium phosphide catalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0032] The preparation method of the porous carbon-rhodium phosphide catalyst doped with nitrogen and phosphorus in the present embodiment is as follows:

[0033] 1) Add 1 volume of glucose and 2 weights of diglyphosate to 20 volumes of water, stir and mix evenly, and prepare a mixed solvent;

[0034] 2) Add 2 volumes of rhodium chloride to the mixed solvent, stir magnetically for 1 hour, prepare a uniform mixed solution, heat to 150° C., keep for 2 hours, turn the mixed solution into a sol and colloid, and cool it down;

[0035] 3) Put the obtained sol colloid into an oven at 60°C and keep it for 48 hours to dry until it becomes a yellow powder. Grind the yellow powder with a grinder and pass through a 400-mesh molecular sieve, collect the ground product, and then put it in a 600°C oven Furnace calcining 8h, obtains the porous carbon-rhodium phosphide nano material of black nitrogen phosphorus doping;

[0036] 4) After cleaning the black nanomaterial with water and ethanol f...

Embodiment 2

[0040] This embodiment is the same as embodiment 1, the difference is that in this embodiment,

[0041] The raw materials used in step (1) are 20 volumes of water, 2 weights of flour, 0.5 volumes of melamine and 2 volumes of phytic acid;

[0042] Step (2) Add 2 volumes of rhodium nitrate, heat to 120°C, and keep for 15h;

[0043] Step (3) The drying temperature is 80°C for 48 hours, and the calcination temperature is 1100°C for 8 hours;

[0044] The drying temperature in step (4) is 110°C.

[0045] The prepared nitrogen-phosphorus-doped porous carbon-rhodium phosphide nanomaterial catalyst has a special composite structure, with nitrogen-phosphorus-doped porous carbon loaded with 5-12nm-sized particles, and rhodium phosphide nanoparticles are wrapped in the middle of porous carbon .

[0046] The nitrogen and phosphorus doped porous carbon-rhodium phosphide nanomaterial catalyst obtained in Example 2 was used as the electrolyzed water hydrogen production catalyst, and the si...

Embodiment 3

[0048] This embodiment is the same as embodiment 1, the difference is that in this embodiment,

[0049] The raw materials used in step (1) are 40 volumes of water, 5 weights of starch, 2 weights of urea and 3 volumes of phytic acid;

[0050] Step (2) Add 3 volumes of rhodium nitrate, heat to 90°C, and keep for 20h;

[0051] Step (3) The drying temperature is 100°C for 48 hours, and the calcination temperature is 1000°C for 8 hours;

[0052] The drying temperature in step (4) is 110°C.

[0053] The prepared nitrogen-phosphorus-doped porous carbon-rhodium phosphide nanomaterial catalyst has a special composite structure, with nitrogen-phosphorus-doped porous carbon loaded with 10-30nm-sized particles, and rhodium phosphide nanoparticles are wrapped in the middle of porous carbon .

[0054] The nitrogen and phosphorus doped porous carbon-rhodium phosphide nanomaterial catalyst obtained in Example 3 was used as the electrolyzed water hydrogen production catalyst, and the simula...

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Abstract

The invention discloses a nitrogen and phosphorus doped porous carbon-rhodium phosphide catalyst as well as a preparation method and application thereof, and relates to the technical field of a catalyst. Polyhydric alcohol, a rhodium source and substances containing a nitrogen and phosphorus compound are dispersed into water; stirring is performed to form mixed sol; one-step high-temperature calcination is used for preparation to obtain a composite nanometer material with the rhodium phosphide loaded on porous carbon, wherein a porous carbon carrier is modified by nitrogen and phosphorus in the compound; rhodium phosphide nanoparticles are loaded on the nitrogen and phosphorus modified porous carbon, wherein the rhodium phosphide nanoparticles have the size being 4 to 8 nanometers. The prepared nitrogen and phosphorus doped porous carbon-rhodium phosphide catalyst has the advantages that the synthetic method is simple; the repeatability is high; the operation is easy; the characteristics of uniform dimension, high purity, lower cost than that of platinum-carbon materials, complete industrialized production and the like are realized; the performance of generating hydrogen through water electrolysis is about the same as that of platinum-carbon; very practical industrial values are realized.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a porous carbon-rhodium phosphide catalyst doped with nitrogen and phosphorus, a preparation method and application thereof. Background technique [0002] With the rapid development of the world's energy revolution, the replacement of traditional fossil fuels by clean and renewable energy represented by hydrogen energy is an inevitable trend in the development of the 21st century. Therefore, the development and utilization of hydrogen energy is particularly urgent. Hydrogen production by electrolysis of water is one of the main methods to achieve large-scale hydrogen production at present, but the existence of overpotential leads to excessive energy consumption, which is the bottleneck restricting its industrial development. Although the commercial Pt / C catalyst is currently the best hydrogen evolution catalyst, the low reserves and high price limit its large-scale...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCB01J27/24C25B1/04C25B11/091Y02E60/36
Inventor 柳守杰马婉娇
Owner ANHUI NORMAL UNIV
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