Multihole PdRu alloy catalyst for electrochemically synthesizing ammonia and preparation method thereof

A technology of alloy catalyst and gold catalyst, which is applied in the research field of electrochemical synthesis of ammonia, can solve the problems of toxic and harmful substances, unfavorable sustainable development, time-consuming and other problems, and achieve the effect of fast reaction, simple synthesis and high application prospect

Active Publication Date: 2019-01-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are relatively complicated and time-consuming, and produce toxic and harmful substances, which is not conducive to sustainable development.

Method used

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  • Multihole PdRu alloy catalyst for electrochemically synthesizing ammonia and preparation method thereof
  • Multihole PdRu alloy catalyst for electrochemically synthesizing ammonia and preparation method thereof
  • Multihole PdRu alloy catalyst for electrochemically synthesizing ammonia and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method for a porous PdRu alloy catalyst for electrochemical synthesis of ammonia, said method comprising the steps of:

[0042] 1) Prepare 20mM potassium chloropalladate and ruthenium chloride aqueous solutions, then take out 5mL respectively, and mix them to form solution A.

[0043] 2) Configure 20mM sodium borohydride aqueous solution, take out 50mL to make solution B.

[0044] 3) Under stirring, solution B was quickly added dropwise to solution A, reacted for 3 minutes, then centrifuged, washed with ethanol / water five times, and finally dried to obtain a PdRu alloy porous catalyst with good electrocatalytic ammonia synthesis performance.

[0045] Obtain the SEM picture of PdRu alloy porous catalyst see figure 1 , to obtain the TEM image of PdRu alloy porous catalyst see figure 2 , to obtain the surface scan of the PdRu alloy porous catalyst see image 3 , to obtain the XRD pattern of the PdRu alloy porous catalyst see Figure 4 , obtain the XPS fi...

Embodiment 2

[0048] A preparation method for a porous PdRu alloy catalyst for electrochemical synthesis of ammonia, said method comprising the steps of:

[0049] 1) Prepare 20mM potassium chloropalladate aqueous solution, and then take out 10mL respectively to make solution A.

[0050] 2) Configure 20mM sodium borohydride aqueous solution, take out 50mL to make solution B.

[0051] 3) Under ultrasonication, solution B was quickly added to solution A, reacted for 3 minutes, then centrifuged, washed with ethanol / water five times, and finally dried to obtain a Pd porous catalyst with good electrocatalytic ammonia synthesis performance.

[0052] Obtain the SEM figure of porous Pd catalyst see Figure 8 , to obtain the XPS diagram of the porous Pd catalyst see Figure 9 , to obtain the electric double layer capacitance map of the porous Pd catalyst see Figure 10 .

[0053] It can be seen from the figure that the Pd catalyst has an obvious porous structure, and the surface is composed of ma...

Embodiment 3

[0055] A method for preparing a porous PdRu alloy catalyst for electrochemical synthesis of ammonia with controllable structure and composition, said method comprising the steps of:

[0056] 1) Prepare 20mM ruthenium chloride aqueous solution, and then take out 10mL respectively to make solution A.

[0057] 2) Configure 20mM sodium borohydride aqueous solution, take out 50mL to make solution B.

[0058] 3) Under ultrasound, solution B was quickly added to solution A, reacted for 3 minutes, then centrifuged, washed with ethanol / water five times, and finally dried to obtain a Ru porous catalyst with good electrocatalytic ammonia synthesis performance.

[0059] Obtain the SEM figure of porous Ru catalyst see Figure 11 , to obtain the XPS diagram of the porous Ru catalyst see Figure 12 , to obtain the electric double layer capacitance map of the porous Ru catalyst see Figure 13 .

[0060] It can be seen from the figure that the Ru catalyst has an obvious porous structure, a...

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Abstract

The invention discloses a multihole PdRu alloy catalyst for electrochemically synthesizing ammonia and a preparation method thereof. The preparation method comprises the following steps: dissolving potassium chloride and ruthenium chloride in deionized water, and controlling the concentrations of the potassium chloride and the ruthenium chloride between 10 mM and 40 mM; then dissolving sodium borohydride in deionized water, and controlling the concentration between 5 mM and 50 mM; in a stirring state, quickly adding a freshly synthesized sodium borohydride solution into a precious metal precursor solution for reaction, and washing, centrifugating and drying the product after 1 to 5 minutes, thus obtaining the structure and component-controllable PdRu alloy catalyst. The preparation processis simple, and the reaction time is extremely short; at normal temperature and normal pressure, the prepared material is excellent in electrochemically synthesizing ammonia performance.

Description

(1) Technical field [0001] The invention relates to a porous PdRu alloy catalyst with controllable structure and components and a preparation method thereof. The catalyst can be used in the research of electrochemical synthesis of ammonia. (2) Background technology [0002] Ammonia is a very important chemical that is widely used in agriculture, pharmaceuticals, and various other industries. In addition, ammonia is considered to be a promising green energy because of its high hydrogen content and easy liquefaction. At present, the industrial preparation of ammonia is mainly through the Haber-Bosch method, which is under the action of an iron-based catalyst, nitrogen and hydrogen are converted into ammonia under high temperature and pressure (Marnellos, G.; Stoukides, M.Ammonia Synthesis at Atmospheric Pressure . Science 1998, 282, 98–100). In this process, a large amount of energy and fossil fuels are consumed, about 1-2% of the global energy provided annually, and 5% of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J35/02C25B1/00C25B11/06
CPCB01J23/462B01J35/0033B01J35/02C25B1/00C25B11/04
Inventor 王鸿静尹淑丽王自强许友薛海荣王亮
Owner ZHEJIANG UNIV OF TECH
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