In recent years, scientists have developed many methods to convert carbon dioxide into ethanol, such as photocatalysis, electrocatalysis and batch reactor thermal catalysis. Compared with the above technical approaches, in the continuous flow fixed bed reactor, it is easier to realize industrial application because of convenient logistics and energy flow management.

2. Further explanation, but the current technology can not achieve controllable and accurate carbon enrichment and directional production of ethanol, and it is easy to produce a large number of low-value by-products. This time, the researchers innovatively used the "structural encapsulation method" to accurately construct the "double palladium catalytic site"-the nano "water storage" membrane reactor. The structure of the synthesized catalyst is similar to a capsule, and the dipalladium catalyst dispersed by ceria carrier is encapsulated in the capsule.

3. The shell of the capsule has high selectivity, and after hydrophobic modification, the water generated inside is guaranteed to be rich, and the product ethanol can overflow. The water environment can stabilize the active site of bis-palladium, and the catalyst can convert carbon dioxide into ethanol selectively, efficiently and stably under mild conditions (3MPa, 240℃).

4. Ethanol, commonly known as "alcohol", is not only an important basic chemical, but also closely related to people's daily life, and can be used to make drinks, disinfectants and vehicle fuels. At the same time, ethanol can also be converted into ethylene and downstream high-value chemical products. In the preparation of ethanol, grain fermentation and coal-based ethanol technology are generally used in industry.

5. The situation of "competing with people for grain" will inevitably occur when grain is fermented to produce ethanol. The process route of coal-based ethanol is complex, and a large amount of carbon dioxide will be produced in the process of ethanol production. "Using carbon dioxide as a carbon source to directly synthesize ethanol with higher value in one step can not only avoid consuming food and coal resources, but also reduce carbon dioxide emissions.

6. The solution of this technical problem will provide great opportunities for large-scale high-value utilization of carbon dioxide. Liu Xiaohao, the author of the paper communication, told the reporter. "The synthesis process and catalytic reaction route of the catalyst are simple, and it has a large-scale industrial application prospect. In the future, we will continue to promote the industrial amplification of catalysts in the practical application process, and realize the high-value utilization of carbon dioxide resources through coupling with carbon capture and green hydrogen production. "