Controlling Chemical Reactions in Confined Environments: Water Dissociation in MOF-74
- Univ. of Texas at Dallas, Richardson, TX (United States)
- Wake Forest Univ., Winston-Salem, NC (United States)
- Rutgers Univ., Piscataway, NJ (United States)
- Wake Forest Univ., Winston-Salem, NC (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
The confined porous environment of metal organic frameworks (MOFs) is an attractive system for studying reaction mechanisms. Compared to flat oxide surfaces, MOFs have the key advantage that they exhibit a well-defined structure and present significantly fewer challenges in experimental characterization. As an example of an important reaction, we study here the dissociation of water—which plays a critical role in biology, chemistry, and materials science—in MOFs and show how the knowledge of the structure in this confined environment allows for an unprecedented level of understanding and control. In particular, combining in-situ infrared spectroscopy and first-principles calculations, we show that the water dissociation reaction can be selectively controlled inside Zn-MOF-74 by alcohol, through both chemical and physical interactions. Methanol is observed to speed up water dissociation by 25% to 100%, depending on the alcohol partial pressure. On the other hand, co-adsorption of isopropanol reduces the speed of the water reaction, due mostly to steric interactions. In addition, we also investigate the stability of the product state after the water dissociation has occurred and find that the presence of additional water significantly stabilizes the dissociated state. With this being said, our results show that precise control of reactions within nano-porous materials is possible, opening the way for advances in fields ranging from catalysis to electrochemistry and sensors.
- Research Organization:
- Univ. of Texas at Dallas, Richardson, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-08ER46491
- OSTI ID:
- 1501835
- Journal Information:
- Applied Sciences, Vol. 8, Issue 2; ISSN 2076-3417
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Nanoporous Materials and Their Applications
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journal | March 2019 |
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