Nano-metal or metal alloy catalyst and preparing method thereof

A nano-metal and metal alloy technology, which is applied in the field of nano-material application and catalysis, can solve the problems that the formation of three-dimensional materials has a huge impact, cannot form a three-dimensional graphene structure, and cannot obtain high quality, and achieve excellent catalytic performance, no support, good The effect of mechanical properties

Active Publication Date: 2015-04-29
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mechanism is as follows: using graphene oxide as a precursor, after being modified by the positively charged organic electrolyte reagent PDDA, the surface of graphene oxide is positively charged, which can electrostatically adsorb some negatively charged metal ion precursors (here if using There is no need to use PDDA to modify the positively charged metal ion precursor), then use ultrasonic reduction method, add an appropriate amount of strong reducing agent under ultrasonic conditions for reduction, then add ascorbic acid, and after constant temperature and heat preservation, three-dimensional graphene water can be formed. The composite material of gel-loaded nanoparticles can be obtained after freeze-drying or supercritical CO2 drying to obtain three-dimensiona

Method used

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  • Nano-metal or metal alloy catalyst and preparing method thereof
  • Nano-metal or metal alloy catalyst and preparing method thereof
  • Nano-metal or metal alloy catalyst and preparing method thereof

Examples

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Example Embodiment

[0032] Example 1

[0033] Example 1 is the preparation of a three-dimensional graphene aerogel supported Pt / Ni alloy catalyst:

[0034] 1) The graphene oxide powder is dissolved in deionized water to obtain a uniformly dispersed graphene oxide aqueous solution, and the concentration of the graphene oxide aqueous solution is 1 mg / mL.

[0035] 2) Add 25 microliters of 1.2% PDDA aqueous solution to 5 mL of the above graphene oxide aqueous solution, and ultrasonicate for 30 min to obtain PDDA modified graphene oxide aqueous solution.

[0036] 3) Change the molar concentration of K with 0.1 mol / L 2 PtCl 4 And Ni (OAC) 2 Add 200 μl each of the PDDA-modified graphene oxide aqueous solution in 2), and ultrasonically disperse for 30 min.

[0037] 4) Under ultrasonic conditions, add 0.12 mmol of sodium borohydride reducing agent to 3) to obtain the mixed solution, and continue Ultrasound response 10 min.

[0038] 5) Add 10 mg of ascorbic acid to 4) the mixed solution, and ultrasonically dispers...

Example Embodiment

[0042] Example 2

[0043] The steps of Example 2 are similar to those of Example 1, except that the amount of PDDA is increased from 25 microliters to 100 microliters, and the others remain unchanged; figure 2 For its digital photos, it can be seen from the digital photos that when the amount of PDDA is increased to 100 ml, a suspension is formed, and a three-dimensional hydrogel structure cannot be formed, so a three-dimensional aerogel structure cannot be formed in the end. This is because excessive PDDA binds all the groups contained in the graphene oxide, which makes the formed graphene sheets separated from each other, and thus cannot be assembled into a three-dimensional graphene hydrogel structure.

Example Embodiment

[0044] Example 3

[0045] The steps of Example 3 are similar to those of Example 1, except that the amount of sodium borohydride added per milliliter of graphene oxide solution is increased to 0.5 mmol , The others remain unchanged.

[0046] image 3 For its digital photo, it can be seen from the picture that a large number of fragments are piled up in the small bottle, and the three-dimensional hydrogel structure cannot be formed, and the three-dimensional aerogel structure cannot be formed; this is because after too much sodium borohydride, the reaction It is too strong, and graphene oxide also begins to be reduced to graphene by it, resulting in an instantaneous decrease in water solubility and precipitation.

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Abstract

The invention relates to a graphene aerogel-supported nano-metal or metal alloy catalyst and a preparing method thereof and belongs to the technical field of nanometer material application and catalysis. The preparing method is characterized by comprising the following steps: using graphene oxide and a metal compound as precursors, and obtaining a catalyst with small-size nano-metal and nano-metal alloy particles supported by a three-dimensional porous graphene aerogel by a continuous reduction process. In the catalyst, the varieties of the nano-metal and the nano-metal alloy are selected from Pt, Au, Ag, Pd, Ru, Rh, Pb, Fe, Co, Ni, Ir, Cu and the like; the varieties can be matched at will by any mixing ratio; the nanometer particles are about 2-6nm in size and uniformly distributed on a graphene sheet layer. Meanwhile, the graphene is assembled into a three-dimensional porous aerogel structure, the average size of pore diameters is 1-2 micrometers, high specific area, high electron transmission rate and high mass transmission rate can be obtained, and the agglomeration of the graphene and the nanometer particles is prevented. The composite has excellent catalytic performance, and the components of the catalyst can be selected according to different requirements.

Description

technical field [0001] The invention relates to a graphene airgel-loaded nano-metal or metal alloy catalyst and a preparation method thereof, belonging to the technical field of nano-material application and catalysis. Background technique [0002] Nano-noble metals platinum (Pt), gold (Au), silver (Ag), palladium (Pd) are very active catalysts, widely used in various chemical reactions including hydrogenation, NO reduction, CO oxidation and organic small molecule oxidation reactions , oxygen reduction, etc. Not only that, but Pt and Pd are also the most important catalysts for fuel cells; with the continuous development of industry and technology, the importance of clean energy has become increasingly prominent. This is not only a challenge to energy technology, but also brings energy science. to a huge impetus. [0003] Proton exchange membrane fuel cell (PEMFC), as a new type of energy device, has many advantages such as low operating temperature, no pollution, high spec...

Claims

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Application Information

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IPC IPC(8): B01J23/89
Inventor 周亚洲杨娟程晓农李军
Owner JIANGSU UNIV
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