TY - JOUR
T1 - Probing Acid-Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions
AU - Wu, Yiqing
AU - Gao, Feng
AU - Wang, Huamin
AU - Kovarik, Libor
AU - Sudduth, Berlin
AU - Wang, Yong
N1 - Publisher Copyright:
© 2021 American Chemical Society. All rights reserved.
PY - 2021/2/25
Y1 - 2021/2/25
N2 - 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 at 423 K, diffuse reflectance infrared Fourier transform spectroscopy measurements show that both molecular and dissociative adsorption occur on TiO2(101), while dissociative adsorption dominates on TiO2(001). During methanol temperature-programmed desorption, TiO2(001) mainly generates the 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).
AB - 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 at 423 K, diffuse reflectance infrared Fourier transform spectroscopy measurements show that both molecular and dissociative adsorption occur on TiO2(101), while dissociative adsorption dominates on TiO2(001). During methanol temperature-programmed desorption, TiO2(001) mainly generates the 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).
UR - http://www.scopus.com/inward/record.url?scp=85101552929&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.0c11107
DO - 10.1021/acs.jpcc.0c11107
M3 - Article
AN - SCOPUS:85101552929
SN - 1932-7447
VL - 125
SP - 3988
EP - 4000
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 7
ER -