CO and O overlayers on Pd nanocrystals supported on TiO2(110)
(2013) In Faraday Discussions 162. p.191-200- Abstract
- We have prepared a model catalytic system by depositing Pd onto a TiO2(110) surface held at similar to 720 K. Scanning tunneling microscopy (STM) reveals well-defined Pd nanocrystals consisting of (111) top facets with {111} and {100} side facets. The Pd nanocrystals go down to about 10 nm in width and 1.3 nm in height. Top facets can be imaged with atomic resolution, indicating the absence of TiOx encapsulation. The model catalyst was probed by exposure to CO and O-2. By varying the CO exposure, different CO overlayers were formed on the (111) top facets, with coverages ranging from 0.33 to 0.75 of a monolayer. Near edge X-ray absorption fine structure (NEXAFS) measurements at 300 K reveal that at around 0.5 ML coverage, CO is oriented... (More)
- We have prepared a model catalytic system by depositing Pd onto a TiO2(110) surface held at similar to 720 K. Scanning tunneling microscopy (STM) reveals well-defined Pd nanocrystals consisting of (111) top facets with {111} and {100} side facets. The Pd nanocrystals go down to about 10 nm in width and 1.3 nm in height. Top facets can be imaged with atomic resolution, indicating the absence of TiOx encapsulation. The model catalyst was probed by exposure to CO and O-2. By varying the CO exposure, different CO overlayers were formed on the (111) top facets, with coverages ranging from 0.33 to 0.75 of a monolayer. Near edge X-ray absorption fine structure (NEXAFS) measurements at 300 K reveal that at around 0.5 ML coverage, CO is oriented with the molecular axis more or less normal to TiO2(110). Dosing small amounts of O-2 separately on a Pd/TiO2(110) surface led to an overlayer of p(2 x 2)-O formed on the (111) top facet of the Pd nanocrystals at 190 K. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3979355
- author
- Yim, Chi Ming ; Pang, Chi Lun ; Humphrey, David S. ; Muryn, Christopher A. ; Schulte, Karina LU ; Perez, Ruben and Thornton, Geoff
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Faraday Discussions
- volume
- 162
- pages
- 191 - 200
- publisher
- Royal Society of Chemistry
- external identifiers
-
- wos:000321591000011
- scopus:84884855964
- ISSN
- 1364-5498
- DOI
- 10.1039/c2fd20137b
- language
- English
- LU publication?
- yes
- id
- a0ddf4e0-743d-42dc-a9e8-83f2b772f2a8 (old id 3979355)
- date added to LUP
- 2016-04-01 10:27:59
- date last changed
- 2022-01-25 23:31:49
@article{a0ddf4e0-743d-42dc-a9e8-83f2b772f2a8,
abstract = {{We have prepared a model catalytic system by depositing Pd onto a TiO2(110) surface held at similar to 720 K. Scanning tunneling microscopy (STM) reveals well-defined Pd nanocrystals consisting of (111) top facets with {111} and {100} side facets. The Pd nanocrystals go down to about 10 nm in width and 1.3 nm in height. Top facets can be imaged with atomic resolution, indicating the absence of TiOx encapsulation. The model catalyst was probed by exposure to CO and O-2. By varying the CO exposure, different CO overlayers were formed on the (111) top facets, with coverages ranging from 0.33 to 0.75 of a monolayer. Near edge X-ray absorption fine structure (NEXAFS) measurements at 300 K reveal that at around 0.5 ML coverage, CO is oriented with the molecular axis more or less normal to TiO2(110). Dosing small amounts of O-2 separately on a Pd/TiO2(110) surface led to an overlayer of p(2 x 2)-O formed on the (111) top facet of the Pd nanocrystals at 190 K.}},
author = {{Yim, Chi Ming and Pang, Chi Lun and Humphrey, David S. and Muryn, Christopher A. and Schulte, Karina and Perez, Ruben and Thornton, Geoff}},
issn = {{1364-5498}},
language = {{eng}},
pages = {{191--200}},
publisher = {{Royal Society of Chemistry}},
series = {{Faraday Discussions}},
title = {{CO and O overlayers on Pd nanocrystals supported on TiO2(110)}},
url = {{http://dx.doi.org/10.1039/c2fd20137b}},
doi = {{10.1039/c2fd20137b}},
volume = {{162}},
year = {{2013}},
}