Probing Acid–Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions

Wu, Yiqing; Gao, Feng; Wang, Huamin; Kovarik, Libor; Sudduth, Berlin; Wang, Yong

doi:10.1021/acs.jpcc.0c11107

Probing Acid–Base Properties of Anatase TiO₂ Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions

Journal Article · Wed Feb 10 00:00:00 EST 2021 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.0c11107· OSTI ID:1995952

Wu, Yiqing ^[1]; ^[1]; ^[1]; Kovarik, Libor ^[1]; Sudduth, Berlin ^[2]; ^[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)

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).

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1995952

Report Number(s):: PNNL-SA-158674

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 7 Vol. 125; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Anatase TiO2
acid-base catalyst
adsorption
alcohols
dehydration
desorption
methanol
minerals
oxides
{001} facet: {101} facet

Probing Acid–Base Properties of Anatase TiO2 Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions

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Probing Acid–Base Properties of Anatase TiO₂ Nanoparticles with Dominant {001} and {101} Facets Using Methanol Chemisorption and Surface Reactions