"Science" recently published the scientific research results of the Zhejiang University team. After more than three years of concentrated research, the research team used a heterogeneous catalyst system to efficiently convert methane to methanol at a mild condition of 70 ° C. The conversion rate was 17.3%, and the methanol selectivity reached 92%, which is the highest current level.
No one thought that this research was actually an inspiration from the sheepfold.
Zhejiang University professor Xiao Fengshou and researcher Wang Liang's team conducted research from the perspective of how to lock the "naughty" hydrogen peroxide. They thought of the sheepfolds in the countryside, which prevented the sheep from running away through the fence. "Why don't you try to add a fence in the reaction to enclose the hydrogen peroxide." Xiao Fengshou said that by virtue of this aura, they embarked on the experiment, and the result soon succeeded.
"We use long-chain alkanes as a 'molecular fence', so that the hydrophilic hydrogen peroxide is enclosed in the catalyst and cannot diffuse out." Wang Liang introduced, while hydrogen, oxygen and methane can still enter the reaction zone, and at the same time After methanol is produced, it can run out quickly and will not compete with methane.
It was such a layer of "molecular fence" that increased the concentration of hydrogen peroxide to 10,000 times in the experiment, which accelerated the methane oxidation reaction.
In the design of the catalyst, the researchers tightly wrapped the metal nanoparticle catalytic center with zeolite molecular sieves, just like egg white wrapped the egg yolk, so as to stabilize the metal catalytic center in it and would not run around and gather together again. Too.
Researchers embed catalytically active nanoparticles into zeolite molecular sieves to make the catalyst more stable and maximize efficiency. In addition to high efficiency, this catalyst is greener in preparation and will not cause pollution. In the traditional hydrothermal synthesis, some molecular sieves produce 100 tons of wastewater for every 1 ton of methanol synthesis. (Cui Xueqin)
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