Palladium catalysts are frequently employed in processes where methanol is an energy vector or carrier, being useful for the synthesis of methanol from mixtures of carbon dioxide and hydrogen (CO2/H2) or its steam reforming on demand. Results of synchrotron-based ambient pressure X-ray photoelectron spectroscopy for the adsorption of methanol on a Pd(111) model catalyst show a rich surface chemistry and complex phenomena that strongly depend on pressure and temperature. At low pressures (< 10-6 Torr) and temperatures (< 300 K), CO is the dominant decomposition product. Further, as the pressure increases, cleavage of C-H, O-H and C-O bonds is observed, and at elevated temperatures (400-600 K) the formation of CO and CHx/C fragments compete on the surface. Thus, existing reaction networks for methanol decomposition must be modified. Furthermore, surface and subsurface hydrogen (coming from PdHx) play a significant role in the stability and removal of CHx and C species.
🛈
This content will become publicly available on Thu Jun 05 00:00:00 EDT 2025
Kim, Jeongjin, et al. "The Surface Chemistry of Methanol on Pd(111) and H–Pd(111) Surfaces: C–O Bond Cleavage and the Effects of Metal Hydride Formation." Journal of Physical Chemistry Letters, vol. 15, no. 23, Jun. 2024. https://doi.org/10.1021/acs.jpclett.4c01134
Kim, Jeongjin, Lim, Hojoon, Tian, Yi, Piliai, Lesia, Hunt, Adrian, Waluyo, Iradwikanari, Senanayake, Sanjaya D., & Rodriguez, José A. (2024). The Surface Chemistry of Methanol on Pd(111) and H–Pd(111) Surfaces: C–O Bond Cleavage and the Effects of Metal Hydride Formation. Journal of Physical Chemistry Letters, 15(23). https://doi.org/10.1021/acs.jpclett.4c01134
Kim, Jeongjin, Lim, Hojoon, Tian, Yi, et al., "The Surface Chemistry of Methanol on Pd(111) and H–Pd(111) Surfaces: C–O Bond Cleavage and the Effects of Metal Hydride Formation," Journal of Physical Chemistry Letters 15, no. 23 (2024), https://doi.org/10.1021/acs.jpclett.4c01134
@article{osti_2372824,
author = {Kim, Jeongjin and Lim, Hojoon and Tian, Yi and Piliai, Lesia and Hunt, Adrian and Waluyo, Iradwikanari and Senanayake, Sanjaya D. and Rodriguez, José A.},
title = {The Surface Chemistry of Methanol on Pd(111) and H–Pd(111) Surfaces: C–O Bond Cleavage and the Effects of Metal Hydride Formation},
annote = {Palladium catalysts are frequently employed in processes where methanol is an energy vector or carrier, being useful for the synthesis of methanol from mixtures of carbon dioxide and hydrogen (CO2/H2) or its steam reforming on demand. Results of synchrotron-based ambient pressure X-ray photoelectron spectroscopy for the adsorption of methanol on a Pd(111) model catalyst show a rich surface chemistry and complex phenomena that strongly depend on pressure and temperature. At low pressures (-6 Torr) and temperatures (x/C fragments compete on the surface. Thus, existing reaction networks for methanol decomposition must be modified. Furthermore, surface and subsurface hydrogen (coming from PdHx) play a significant role in the stability and removal of CHx and C species.},
doi = {10.1021/acs.jpclett.4c01134},
url = {https://www.osti.gov/biblio/2372824},
journal = {Journal of Physical Chemistry Letters},
issn = {ISSN 1948-7185},
number = {23},
volume = {15},
place = {United States},
publisher = {American Chemical Society},
year = {2024},
month = {06}}