TY - JOUR
T1 - Structure and Thermal Stability of (H2O)4 Tetrahedron and (H2O)6 Hexagon Adsorbed on NaY Zeolite Studied by Synchrotron-Based Time-Resolved X-ray Diffraction
AU - Hu, Maocong
AU - Hanson, Jonathan C.
AU - Wang, Xianqin
N1 - Funding Information:
This contribution was identified by Prof. Yun Hang Hu (Michigan Technological University) as the Best Presentation in the “ENFL: Carbon Management: Advances in Carbon Efficiency, Capture, Conversion, Utilization & Storage” session of the 2017 ACS Fall National Meeting in Washington, DC. The research was carried out at the Brookhaven National Laboratory. J.C.H. acknowledges Kenny Ståhl DTU Lyngby, Denmark, for introducing him to study of thermal dehydration of zeolites. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/4/11
Y1 - 2018/4/11
N2 - Water adsorption and desorption features play an important role in determining the adsorptive and catalytic properties of zeolites. In this study, the extraframework structure (water and cations) in NaY faujasite zeolite was studied by synchrotron-based in situ time-resolved X-ray diffraction (TR-XRD) in combination with the Rietveld refinement method. It was observed that Na cations locating at different sites migrated between each other during the dehydration process. Water molecules at three separate sites showed interesting geometries: (H2O)4 tetrahedron W1, (H2O)6 ice-like hexagonal W2, and disordered triangle W3. Interactions between each form of water and Na cations were deeply investigated. The stability of the waters followed the sequence of W1 > W3 > W2. This work provides insights into both framework structure and cation positions of model zeolite under actual working conditions, which helps fully understand the properties of zeolites.
AB - Water adsorption and desorption features play an important role in determining the adsorptive and catalytic properties of zeolites. In this study, the extraframework structure (water and cations) in NaY faujasite zeolite was studied by synchrotron-based in situ time-resolved X-ray diffraction (TR-XRD) in combination with the Rietveld refinement method. It was observed that Na cations locating at different sites migrated between each other during the dehydration process. Water molecules at three separate sites showed interesting geometries: (H2O)4 tetrahedron W1, (H2O)6 ice-like hexagonal W2, and disordered triangle W3. Interactions between each form of water and Na cations were deeply investigated. The stability of the waters followed the sequence of W1 > W3 > W2. This work provides insights into both framework structure and cation positions of model zeolite under actual working conditions, which helps fully understand the properties of zeolites.
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U2 - 10.1021/acs.iecr.8b00483
DO - 10.1021/acs.iecr.8b00483
M3 - Article
AN - SCOPUS:85045328909
SN - 0888-5885
VL - 57
SP - 4988
EP - 4995
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 14
ER -