Probing Acid–Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions
Abstract
In the present study, we investigate the surface acid-base properties of anatase TiO2 nanomaterials with dominant {101} and {001} facets via methanol titrations. Two anatase nanoparticles, TiO2(101) and TiO2(001), with well-defined morphology are prepared. TiO2(101) is predominantly enclosed by the {101} facets (> 90%), and TiO2(001) contains ~46% {001} facets and ~54% {101} facets. Upon adsorption of methanol 423 K, DRIFTS measurements show that both molecular and dissociative adsorption occurs on TiO2(101), while dissociative adsorption dominates on TiO2(001). During methanol TPD, TiO2(001) mainly generates acid-base product dimethyl ether and thermal cracking products CO and H2, as anticipated. In contrast, substantial amounts of formaldehyde and methane also desorb from TiO2(101), suggesting strong participation of surface defects (e.g., oxygen vacancies).
- Authors:
-
[1];
[1];
[3]
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Washington State Univ., Pullman, WA (United States)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Washington State Univ., Pullman, WA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1995952
- Report Number(s):
- PNNL-SA-158674
Journal ID: ISSN 1932-7447
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 125; Journal Issue: 7; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Anatase TiO2; {001} facet: {101} facet; acid-base catalyst; methanol; dehydration; adsorption; alcohols; desorption; minerals; oxides
Citation Formats
Wu, Yiqing, Gao, Feng, Wang, Huamin, Kovarik, Libor, Sudduth, Berlin, and Wang, Yong. Probing Acid–Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions. United States: N. p., 2021.
Web. doi:10.1021/acs.jpcc.0c11107.
Wu, Yiqing, Gao, Feng, Wang, Huamin, Kovarik, Libor, Sudduth, Berlin, & Wang, Yong. Probing Acid–Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions. United States. https://doi.org/10.1021/acs.jpcc.0c11107
Wu, Yiqing, Gao, Feng, Wang, Huamin, Kovarik, Libor, Sudduth, Berlin, and Wang, Yong. Wed .
"Probing Acid–Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions". United States. https://doi.org/10.1021/acs.jpcc.0c11107. https://www.osti.gov/servlets/purl/1995952.
@article{osti_1995952,
title = {Probing Acid–Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions},
author = {Wu, Yiqing and Gao, Feng and Wang, Huamin and Kovarik, Libor and Sudduth, Berlin and Wang, Yong},
abstractNote = {In the present study, we investigate the surface acid-base properties of anatase TiO2 nanomaterials with dominant {101} and {001} facets via methanol titrations. Two anatase nanoparticles, TiO2(101) and TiO2(001), with well-defined morphology are prepared. TiO2(101) is predominantly enclosed by the {101} facets (> 90%), and TiO2(001) contains ~46% {001} facets and ~54% {101} facets. Upon adsorption of methanol 423 K, DRIFTS measurements show that both molecular and dissociative adsorption occurs on TiO2(101), while dissociative adsorption dominates on TiO2(001). During methanol TPD, TiO2(001) mainly generates acid-base product dimethyl ether and thermal cracking products CO and H2, as anticipated. In contrast, substantial amounts of formaldehyde and methane also desorb from TiO2(101), suggesting strong participation of surface defects (e.g., oxygen vacancies).},
doi = {10.1021/acs.jpcc.0c11107},
journal = {Journal of Physical Chemistry. C},
number = 7,
volume = 125,
place = {United States},
year = {Wed Feb 10 00:00:00 EST 2021},
month = {Wed Feb 10 00:00:00 EST 2021}
}
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