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Propane dehydrogenation (PDH) is an important process step in the production of propylene, which is very important for the petrochemical industry: propylene is the raw material of polypropylene plastic, and polypropylene plastic is a common ingredient in the automotive and textile industries and is often used in packaging Plastic film and many other products
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In order to find a highly active and more durable PDH catalyst, the team of academician Ryong Ryoo from the Institute of Basic Science (IBS) Nanomaterials and Chemical Reaction Center of Korea designed the following experimental schemes: 1.
Atomic-resolved electron microscopy results show that some La and Y will form alloy particles with Pt nanoparticles and be uniformly supported on the mesoporous MFI zeolite (Figure 1)
2
Figure 1.
3
Based on the above assumptions, the researchers designed and synthesized mesoporous gallium silicate zeolite, and then used nitric acid to remove the framework Ga atoms to generate a high concentration of silanol nests
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Figure 2.
In addition, the researchers further extended the method to produce other metal alloys composed of Pt-based metals and REE, that is, by placing rare earth elements that are difficult to reduce (ie, rare earth elements with low reduction potential) into a single atomic species, it can be effectively Activate them to overcome energy barriers, thereby promoting the formation of alloy nanoparticles
Figure 3.
The above research results were titled "Rare-earth-platinum alloy nanoparticles in mesoporous zeolite forcatalysis" and were published online on Nature on September 9, 2020.