Interactions of VOx Species with Amorphous TiO2 Domains on ALD-Derived Alumina-Supported Materials
Abstract
We report that alumina-supported VOx–TiO2 materials are synthesized by atomic layer deposition (ALD) and characterized by diffuse reflectance UV–vis (DRUV–vis) spectroscopy, Raman spectroscopy, and density functional theory (DFT) calculations in order to identify the metal oxide structures present on the surface of the support. Preferential binding of VOx to TiO2 domains is demonstrated by Raman spectroscopy studies and confirmed by DFT. Varying distributions of V–O–Ti, V–O–V, and V–O–Al bonds are present in the examined materials. The interactions of VOx and TiO2 are elucidated further under a reducing, H2 environment at elevated temperatures. An enhancement in reducibility of VOx species is expected and observed upon the modification of alumina with TiO2 above monolayer coverages, but also when a single ALD cycle of TiO2 is deposited following the deposition of VOx on the support. X-ray photoelectron spectroscopy (XPS) detects changes in the oxidation state of vanadium, but not titanium during reduction. Lastly, reversible migration and aggregation of V and Ti atoms is also detected upon heating in H2.
- Authors:
-
[1];
[1];
[1];
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemical and Biological Engineering
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Northwestern Univ., Evanston, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1542922
- Alternate Identifier(s):
- OSTI ID: 1870891
- Grant/Contract Number:
- FG02-03-ER154757; SC0001329; AC02-06CH11357; AC02-05CH11231; FG02-03ER15457
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 13; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Samek, Izabela A., Bobbitt, N. Scott, Snurr, Randall Q., and Stair, Peter C. Interactions of VOx Species with Amorphous TiO2 Domains on ALD-Derived Alumina-Supported Materials. United States: N. p., 2018.
Web. doi:10.1021/acs.jpcc.8b07424.
Samek, Izabela A., Bobbitt, N. Scott, Snurr, Randall Q., & Stair, Peter C. Interactions of VOx Species with Amorphous TiO2 Domains on ALD-Derived Alumina-Supported Materials. United States. https://doi.org/10.1021/acs.jpcc.8b07424
Samek, Izabela A., Bobbitt, N. Scott, Snurr, Randall Q., and Stair, Peter C. Fri .
"Interactions of VOx Species with Amorphous TiO2 Domains on ALD-Derived Alumina-Supported Materials". United States. https://doi.org/10.1021/acs.jpcc.8b07424. https://www.osti.gov/servlets/purl/1542922.
@article{osti_1542922,
title = {Interactions of VOx Species with Amorphous TiO2 Domains on ALD-Derived Alumina-Supported Materials},
author = {Samek, Izabela A. and Bobbitt, N. Scott and Snurr, Randall Q. and Stair, Peter C.},
abstractNote = {We report that alumina-supported VOx–TiO2 materials are synthesized by atomic layer deposition (ALD) and characterized by diffuse reflectance UV–vis (DRUV–vis) spectroscopy, Raman spectroscopy, and density functional theory (DFT) calculations in order to identify the metal oxide structures present on the surface of the support. Preferential binding of VOx to TiO2 domains is demonstrated by Raman spectroscopy studies and confirmed by DFT. Varying distributions of V–O–Ti, V–O–V, and V–O–Al bonds are present in the examined materials. The interactions of VOx and TiO2 are elucidated further under a reducing, H2 environment at elevated temperatures. An enhancement in reducibility of VOx species is expected and observed upon the modification of alumina with TiO2 above monolayer coverages, but also when a single ALD cycle of TiO2 is deposited following the deposition of VOx on the support. X-ray photoelectron spectroscopy (XPS) detects changes in the oxidation state of vanadium, but not titanium during reduction. Lastly, reversible migration and aggregation of V and Ti atoms is also detected upon heating in H2.},
doi = {10.1021/acs.jpcc.8b07424},
journal = {Journal of Physical Chemistry. C},
number = 13,
volume = 123,
place = {United States},
year = {Fri Sep 28 00:00:00 EDT 2018},
month = {Fri Sep 28 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Effect of Vanadium Oxides Composition Loaded on γAl 2 O 3 Catalyst for Oxidative Dehydrogenation of Propane to Propylene
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