I'm doing research in selecting suitable material for hydrogen purification by MOF- 177 ,the main challange is the moisture sensitivity of MOFs 177 ,any idea how to improve the tolerance for MOF 177 to moisture
Hy. I think, you have two reliable options:
-Change Zn to another metal, for example Cu. Of course, changing the metal will result the formation of another MOF structures. But there are many nice MOFs, that are not water sensitive. For example, NU-100 has nice H2 capacity. Highly porous, water-stable Zr-based MOFs could be also nice.
-Use hydrophobic groups nearby the Zn-nodes. For example, a research group prepared a MOF-5 analogue structure with dimethyl-terephtalic acid linkers. The hydrophobic groups nearby the carboxylate groups keep away water from zinc nodes. So this structure is much more water stable, than MOF-5. Of course, methylated MOF-5 has large pore volume and surface area, so the H2 uptake is lower.
The article I covered about the methylated MOF-5:
Chem. Commun. 47, 5244-5246 (2011)
David ,
i appreciate your knowledge and help
the idea of selecting my MOfs is the water and air tolerance plus higher BET of both molecular sieve and carbon to be able to take advantage of higher surface area to use it for purification process like cryo-adsorption ,Vs the other option of just synthesis MOFs with pore size of less than 3 Angstrom to act like membrane filter for other gases other than H2,
i also came to know about hydrophobic that will have good impact on water resistance and also pore size reduction could help ,however still i need to research this how to synthesis MOFs by hydrophobic and if we can synthesis MOF-177 by using hydrophobic
appreciate your input
- Badges
- Science topic