Identification and quantification of distinct active sites in Hf-Beta zeolites for transfer hydrogenation catalysis
Abstract
Despite the significant progress made in characterizing different framework heteroatom sites that exist in Lewis acidic zeolites with probe molecule adsorption and spectroscopy, methods to reliably quantify site counts remain indefinite and have been primarily limited to Sn and Ti Lewis acid sites. Here, methods to quantify framework Lewis acidic Hf4+ sites in zeolite Beta (Hf-Beta) with two Lewis base titrants (pyridine, deuterated acetonitrile) were developed using infrared (IR) spectroscopy. Lewis acid site counts for Hf-Beta zeolites were validated by measuring integrated molar extinction coefficients (IMECs; ε, cm μmol–1) on Sn-Beta zeolites using identical Lewis base titrants to benchmark site counts with established literature procedures to quantify Lewis acid sites in Beta zeolites from IR spectra. Highlighting the importance of benchmarking active site counts against well-established experimental protocols, IMECs of CD3CN bound to open (ε(Sn; 2316 cm–1): 1.80 ± 0.25) and closed (ε(Sn; 2308 cm–1): 3.76 ± 0.33) Sn sites were ~1.8x larger than those previously reported while total Lewis acid site counts agreed with those measured by pyridine (ε(Sn; 1451 cm–1): 1.58 ± 0.16) on six different Sn-Beta zeolites. IMECs measured for IR peaks reflecting pyridine bound to Lewis acidic Hf sites (ε(Hf; 1448 cm–1): 1.54 ± 0.21) andmore »
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1977250
- Alternate Identifier(s):
- OSTI ID: 1836162
- Grant/Contract Number:
- SC0016214
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Catalysis
- Additional Journal Information:
- Journal Volume: 404; Journal Issue: C; Journal ID: ISSN 0021-9517
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Engineering; Acetonitrile; Pyridine; MPVO; Integrated molar extinction coefficient; Lewis acid; Zeolite; Tin-Beta; Hafnium-Beta
Citation Formats
Johnson, Blake A., Di Iorio, John R., and Román-Leshkov, Yuriy. Identification and quantification of distinct active sites in Hf-Beta zeolites for transfer hydrogenation catalysis. United States: N. p., 2021.
Web. doi:10.1016/j.jcat.2021.10.026.
Johnson, Blake A., Di Iorio, John R., & Román-Leshkov, Yuriy. Identification and quantification of distinct active sites in Hf-Beta zeolites for transfer hydrogenation catalysis. United States. https://doi.org/10.1016/j.jcat.2021.10.026
Johnson, Blake A., Di Iorio, John R., and Román-Leshkov, Yuriy. Fri .
"Identification and quantification of distinct active sites in Hf-Beta zeolites for transfer hydrogenation catalysis". United States. https://doi.org/10.1016/j.jcat.2021.10.026. https://www.osti.gov/servlets/purl/1977250.
@article{osti_1977250,
title = {Identification and quantification of distinct active sites in Hf-Beta zeolites for transfer hydrogenation catalysis},
author = {Johnson, Blake A. and Di Iorio, John R. and Román-Leshkov, Yuriy},
abstractNote = {Despite the significant progress made in characterizing different framework heteroatom sites that exist in Lewis acidic zeolites with probe molecule adsorption and spectroscopy, methods to reliably quantify site counts remain indefinite and have been primarily limited to Sn and Ti Lewis acid sites. Here, methods to quantify framework Lewis acidic Hf4+ sites in zeolite Beta (Hf-Beta) with two Lewis base titrants (pyridine, deuterated acetonitrile) were developed using infrared (IR) spectroscopy. Lewis acid site counts for Hf-Beta zeolites were validated by measuring integrated molar extinction coefficients (IMECs; ε, cm μmol–1) on Sn-Beta zeolites using identical Lewis base titrants to benchmark site counts with established literature procedures to quantify Lewis acid sites in Beta zeolites from IR spectra. Highlighting the importance of benchmarking active site counts against well-established experimental protocols, IMECs of CD3CN bound to open (ε(Sn; 2316 cm–1): 1.80 ± 0.25) and closed (ε(Sn; 2308 cm–1): 3.76 ± 0.33) Sn sites were ~1.8x larger than those previously reported while total Lewis acid site counts agreed with those measured by pyridine (ε(Sn; 1451 cm–1): 1.58 ± 0.16) on six different Sn-Beta zeolites. IMECs measured for IR peaks reflecting pyridine bound to Lewis acidic Hf sites (ε(Hf; 1448 cm–1): 1.54 ± 0.21) and CD3CN bound to open (ε(Hf; 2313 cm–1): 2.40 ± 0.22) and closed (ε(Hf; 2307 cm–1): 3.55 ± 0.41) Hf sites, gave similar counts for the total number of Lewis acidic sites across six Hf-Beta zeolites (Si/Hf = 100–413). Consistent with previous reports with Sn-Beta catalysts where open Sn sites are responsible for catalytic turnover, apparent first and zero-order MPVO rate constants (0.01–1 M cyclohexanone in 2-butanol; per total Hf, 373 K) correlated with the total number of open Hf sites, per total Hf, but not with the total number of closed Hf sites or total Lewis acid site counts. Measured initial MPVO rates (0.1 M cyclohexanone in 2-butanol, per open Hf, 373 K) were ~25x higher on hydrophobic Hf-Beta-F than on hydrophilic Hf-Beta-OH zeolites. Overall, the apparent first-order MPVO rate constants (2-butanol solvent, per open Hf, 373 K) were ~6x higher on Hf-Beta-F than on Hf-Beta-OH zeolites. The characterization methods reported here enable normalization of MPVO turnover rates on Sn- and Hf-Beta zeolites by their number of open sites. Finally, this enables performing quantitative rate comparisons across Lewis acid zeolites of varying active site identity, solvation, and pore topology used in liquid-phase catalysis.},
doi = {10.1016/j.jcat.2021.10.026},
journal = {Journal of Catalysis},
number = C,
volume = 404,
place = {United States},
year = {Fri Oct 29 00:00:00 EDT 2021},
month = {Fri Oct 29 00:00:00 EDT 2021}
}
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