Electrocatalytic acetylene hydrogenation reaction method

An acetylene hydrogenation and electrocatalysis technology, applied in electrodes, electrolysis processes, electrolysis components, etc., can solve the problems of conversion rate and product selectivity gap, achieve high conversion rate, promote green sustainable development, and high selectivity. Effect

Active Publication Date: 2021-06-25
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, due to the limitations of existing electrocatalytic systems, such as the mass transfer of acetylene gas in an ethylene-rich atmosphere, the contact of reactive molecules / ions at the catalytic interface, the construction of an electrocatalytic full reaction system, etc., the existing electrocatalytic C 2 h 2 The conversion rate and product selectivity of the hydrogenation (EAR) reaction system still have a huge gap compared with the thermal catalytic process
So far, there are still many research gaps in the electrocatalytic acetylene hydrogenation reaction system and method based on Route 2

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0196] EAR performance of embodiment 1 LD-Cu

[0197] The working electrode is the gas diffusion electrode loaded with CuAl-LDH nanosheets prepared in the preparation example, the carbon cloth is used as the anode, and the gas chamber is 0.5 cm 2 The circular plane air chamber of the above-mentioned construction reaction system ( Figure 3-1 ), the power was turned on, and CuAl-LDH electroreduction was immediately performed in 1M KOH at −0.4 V for 10 min to prepare a gas-diffusion electrode loaded with LDH-derived copper catalyst (LD-Cu) (Table S1), followed by The gas inlet injects the raw material gas into the acetylene chamber; the power supply is continuously connected to make the electrochemical device work and undergo an electrolysis reaction, so that the acetylene-containing gas diffused to the working electrode undergoes an electrocatalytic hydrogenation reaction of acetylene, reducing acetylene to ethylene , the product is discharged from the gas outlet. During th...

Embodiment 2

[0204] Example 2 Cu EAR performance of NPs

[0205]Except using the gas diffusion electrode loaded with commercial Cu NPs (99.9% metal content, 10–30 nm, Shanghai Macklin Biochemical Co., Ltd.) prepared in the preparation example above, electrocatalysis was performed in a similar manner to Example 1. Hydrogenation reaction process: inject raw material gas into the acetylene gas chamber from the air inlet; turn on the power supply to make the electrochemical device work and undergo electrolysis reaction, so that the acetylene-containing gas diffused to the working electrode undergoes electrocatalytic acetylene hydrogenation reaction, The acetylene is reduced to ethylene, and the product is discharged from the gas outlet. Thus, the LSV curves and potential-dependent EAR performance of commercial metallic copper nanoparticles catalysts (Cu NPs) and the SEM images of Cu NPs on GDL before and after electrochemical reactions were tested, as shown in Figure 8 and 9 shown. The...

Embodiment 3

[0207] Example 3 EAR performance on LD-Cu in the presence of ethylene

[0208] In addition to using an ethylene-rich gas source (0.5% C 2 h 2 , 20%C 2 h 4 and Ar balance gas) and changing the flow rate and the structure of the gas chamber as needed, and tested at room temperature (20° C.) in a manner similar to that of Example 1. The amount of hydrogen in the outlet stream was also monitored to demonstrate the hydrogen-free nature of the EAR process. Due to the presence of large amounts of ethylene in the feed gas, removal of H 2 In addition, the production selectivity of ethylene is calculated on a carbon basis.

[0209] for 0.5cm 2 the flat air chamber, Figure 10 Panel A in , shows the conversion of acetylene at different feed gas flow rates. Adjusted by cathode potential, at 1mL min -1 A flow rate of 10000 can convert more than 98% of acetylene, with the best conversion observed at a potential of -0.4V to -0.5V. Higher flow rates resulted in lower conversion of...

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Abstract

The invention discloses an electrocatalytic acetylene hydrogenation reaction method. The method comprises the following steps of: injection of raw material gas: introducing acetylene-containing raw material gas into an acetylene gas chamber separated from an electrochemical device through a working electrode; and electro-catalytic acetylene hydrogenation reaction: switching on a power supply to enable the electrochemical device to work to carry out electrolytic reaction, so as to enable the acetylene-containing gas diffused to the working electrode to be subjected to electro-catalytic acetylene hydrogenation reaction and reduce acetylene into ethylene. According to the invention, acetylene can be electrocatalytically converted into ethylene at high activity, high conversion rate and high selectivity at a low temperature, basic conditions can be created for large-scale application of electrocatalytic acetylene hydrogenation, the method is expected to replace the existing thermocatalytic acetylene hydrogenation chemical process, and green sustainable development of polyethylene industrial production is promoted.

Description

technical field [0001] The invention relates to the field of catalytic hydrogenation reaction, in particular to an electrocatalytic acetylene hydrogenation reaction method. Background technique [0002] Ethylene (C 2 h 4 ) industrial production relies on the pyrolysis of naphtha or saturated C2-C6 hydrocarbons. However, 0.5-2.0% (volume fraction) of acetylene (C 2 h 2 ). This impurity will seriously poison the subsequent Ziegler-Natta catalyst (A.Borodziński, G.C.Bond, Catal.Rev.48,91-144(2006)) used in polyethylene synthesis, resulting in higher production costs and lower product quality . Therefore, how to effectively and selectively remove acetylene from the ethylene-rich gas stream to make the ethylene purity reach the level of polymer production has important practical significance. After nearly a hundred years of research, technical routes such as solvent absorption and catalytic hydrogenation have been developed one after another. [0003] Since the 1950s, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/25C25B3/03C25B11/032C25B11/052
Inventor 张铁锐施润
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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