Nonclassical Adsorption of Methanol on Palladium: The Competition between Adsorption of Single Molecules and Clusters
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
The Journal of Physical Chemistry C
ISSN: 1932-7447
, E-ISSN: 1932-7455
|
| Output data |
Year: 2019,
Volume: 123,
Number: 12,
Pages: 7259-7265
Pages count
: 7
DOI:
10.1021/acs.jpcc.9b00840
|
| Tags |
REFLECTION-ABSORPTION SPECTROSCOPY; INFRARED-SPECTRA; CO ADSORPTION; SOLID-SURFACES; CHEMISORPTION; WATER; HYDROGEN; DECOMPOSITION; Pd(111); LIQUID |
| Authors |
Kaichev Vasily V.
1,2
,
Selivanova Aleksandra V.
1
,
Tsapina Anna M.
1
,
Saraev Andrey A.
1,2
,
Bukhtiyarov Valerii I.
1,2
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
|
| 2 |
Novosibirsk State University, Novosibirsk 630090, Russia
|
|
Funding (1)
|
1
|
Federal Agency for Scientific Organizations
|
0303-2016-0001
|
The adsorption of methanol on the Pd(111) surface at 80, 90, and 100 K has been studied by polarization modulation infrared reflection–absorption spectroscopy. It is found that the adsorption of methanol on the palladium surface does not proceed via the layer-by-layer mechanism. At temperatures below 100 K, methanol adsorbs molecularly to form clusters containing several hydrogen-bonded CH3OH molecules. These clusters have low thermal stability and decompose even at 100 K to form isolated methanol molecules bonded with palladium atoms. As a result, at a temperature between 100 and 120 K, methanol adsorbs intact to produce adsorbed isolated molecules. These adsorbed species fast desorb at a temperature above 120 K. The dehydration of methanol is not observed under used conditions.