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New electrocatalytic reaction strategy based on gas-solid-liquid three-phase interface
New electrocatalytic reaction strategy based on gas-solid-liquid three-phase interfaceNews from Sinochem News on July 22 from the Institute of Physics and Chemistry of the Chinese Academy of Sciences, the researcher Zhang Tierui's team has made progress in the study of room temperature acetylene reduction to ethylene, and proposed a new type based on the gas-solid-liquid three-phase interface The electrocatalytic acetylene reduction reaction strategy is expected to replace the existing thermal catalytic acetylene hydrogenation technology and be applied to the purification process of industrial ethylene feed gas
.
According to reports, the room temperature acetylene electroreduction strategy developed by the research team requires less than 0.
5% of the ethylene market price to convert low-concentration acetylene into ethylene, and it has outstanding advantages over traditional thermal catalysis in terms of energy and atomic economy.
.
In addition, the team solved the scientific problem of interfacial diffusion and mass transfer in the traditional solid-liquid two-phase electrocatalytic system.
Zhang Tierui said that the traditional thermal catalytic acetylene hydrogenation technology usually needs to be carried out at a temperature above 100°C and requires the introduction of excess hydrogen, which not only easily triggers the excessive hydrogenation of ethylene, but also leads to subsequent additional gas separation operations
.
Therefore, achieving the selective catalytic conversion of acetylene at a lower temperature while avoiding the introduction of additional gas impurities is still a challenge
The room temperature selective conversion of low-concentration acetylene in an ethylene-rich atmosphere depends on the redesign of catalytic materials and catalytic systems
.
"In view of this, combined with the research foundation in catalytic materials and electrochemistry, the research team conducted a checkerboard search and test from materials preparation, reactor design, parameter control, etc.
It is understood that the research team used the Cu/Cu₂O interface structure nano-catalyst material formed by the in-situ conversion of layered double metal hydroxide (LDH), replacing hydrogen with water as the proton source, and realizing a low concentration of acetylene in an ethylene-rich atmosphere at room temperature.
The selective reduction of acetylene, the conversion rate of acetylene is 99.
Specifically, industrial ethylene raw materials are derived from the cracking of hydrocarbons such as naphtha, and the cracked products inevitably contain 0.
5% to 2.
0% of acetylene impurities
.
Acetylene impurities will poison the Ziegler-Natta catalyst used in the subsequent ethylene polymerization reaction and affect the quality of polymer products
In the next step, the research team will do more in-depth research on the relationship between the structure of catalytic materials and the activity of acetylene electroreduction, and conduct research on solid electrolytes, modular electrochemical acetylene reduction systems, etc.