Catalytic performance of defective MIL -۱۰۰ in chemical hydrogenation

Metal-organic frameworks (MOFs), constructed by inorganic nodes (metal clusters and/or ions) with organic linkers, have emerged as a new class of porous materials. Along with their derivatives, MOFs have recently been under intense study for their applications in various hydrogen production techniques. The catalytic performance of MOFs can be improved. Quasi-MOFs (Q-MOFs) are a subset of large-scale structural defective MOFs which can be easily produced by postsynthetically partial deligandation under controlled thermal treatment in different atmospheres as well as chemical approach. Q-MOF is structurally located between a pristine MOF and the final metal compound, and subsequently, it has demonstrated the features of both. In addition, a chemocatalytic hydrogen generation reaction (HGR) is an attractive way to safely and quickly release hydrogen from a solid or liquid phase, especially using NaBH۴ as an appropriate hydride precursor. The chemical hydrogenation of the defective MIL-۱۰۰ catalyst in the NaBH۴ hydrolysis process has been evaluated under mild conditions. Controlled thermal treatment of Q-MIL-۱۰۰ at ۲۵۰ °C has been found to induce the partial removal of BTC ligands, while maintaining the overall structures of the MOFs. In the context of chemical hydrogen generation through NaBH۴ hydrolysis, Q-MIL-۱۰۰ demonstrated superior catalytic activity compared to its parent framework, MIL-۱۰۰. This improvement can be attributed to the cooperative effect of Lewis acid centers and the presence of micro-, meso-pores within the frameworks. The long-term stability and performance of Q-MIL-۱۰۰ catalyst in NaBH۴ hydrolysis process, as observed for the first time, highlights its potential as a reliable and durable catalyst for hydrogen generation. These findings provide valuable insights for the design of next-generation catalysts with long-term efficiency and stability using quasi iron-based MOFs.

کلیدواژه ها:

Quasi MIL-۱۰۰ ، Pore engineering ، Chemical hydrogeneration