Next Article in Journal
Preparative Purification of Total Flavonoids from Sophora tonkinensis Gagnep. by Macroporous Resin Column Chromatography and Comparative Analysis of Flavonoid Profiles by HPLC-PAD
Next Article in Special Issue
A Facile Strategy to Prepare Shaped ZSM-5 Catalysts with Enhanced Para-Xylene Selectivity and Stability for Toluene Methylation: The Effect of In Situ Modification by Attapulgite
Previous Article in Journal
Two New Flavonoids from the Leaves of Baccharis oblongifolia (Ruiz and Pav.) Pers. (Asteraceae)
Article

Studying Proton Mobility in Zeolites by Varying Temperature Infrared Spectroscopy

Max-Planck-Institut für Kohlenforschung, Department of Heterogeneous Catalysis, 45470 Mülheim an der Ruhr, Germany
*
Authors to whom correspondence should be addressed.
Molecules 2019, 24(17), 3199; https://doi.org/10.3390/molecules24173199
Received: 13 August 2019 / Revised: 26 August 2019 / Accepted: 29 August 2019 / Published: 3 September 2019
We report a varying temperature infrared spectroscopic (VTIR) study with partial deuterium isotopic exchange as a method for characterizing proton mobility in acidic materials. This VTIR technique permits the estimation of activation energies for proton diffusion. Different acidic materials comprising classical proton-conducting materials, such as transition metal phosphates and sulfonated solids, as well as different zeolites, are tested with this new method. The applicability of the method is thus extended to a vast library of materials. Its underlying principles and assumptions are clearly presented herein. Depending on the temperature ranges, different activation energies for proton transfer are observed irrespective of the different materials. In addition to the well-studied transition metal phosphates, Si-rich zeolites appear to be promising proton-transfer materials (with Eact < 40 kJ mol−1) for application in high-temperature (>150 °C) PEM fuel cells. They significantly outperform Nafion and sulfonated silica, which exhibit higher activation energies with Eact ~ 50 and 120 kJ mol−1, respectively. View Full-Text
Keywords: pProton-conducting materials; VTIR; acidic materials; zeolites pProton-conducting materials; VTIR; acidic materials; zeolites
Show Figures

Figure 1

MDPI and ACS Style

Losch, P.; Joshi, H.; Stegmann, N.; Vozniuk, O.; Schmidt, W. Studying Proton Mobility in Zeolites by Varying Temperature Infrared Spectroscopy. Molecules 2019, 24, 3199. https://doi.org/10.3390/molecules24173199

AMA Style

Losch P, Joshi H, Stegmann N, Vozniuk O, Schmidt W. Studying Proton Mobility in Zeolites by Varying Temperature Infrared Spectroscopy. Molecules. 2019; 24(17):3199. https://doi.org/10.3390/molecules24173199

Chicago/Turabian Style

Losch, Pit, Hrishikesh Joshi, Niklas Stegmann, Olena Vozniuk, and Wolfgang Schmidt. 2019. "Studying Proton Mobility in Zeolites by Varying Temperature Infrared Spectroscopy" Molecules 24, no. 17: 3199. https://doi.org/10.3390/molecules24173199

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop