TY - JOUR
T1 - On the selectivity of butyric acid photoreforming over Au/TiO2 and Pt/TiO2 by UV and visible radiation
T2 - A combined experimental and theoretical study
AU - Scandura, Gabriele
AU - Sajjad, Muhammad
AU - Singh, Nirpendra
AU - Palmisano, Giovanni
AU - Rodríguez, Jorge
N1 - Funding Information:
G.S. acknowledges Khalifa University and the Sustainable Bioenergy Research Consortium (SBRC) (funding KUX8434000305/EX2019-003 ) for this fellowship. The Research and Innovation Center on CO 2 and H 2 at Khalifa University is acknowledged for funding (RC2-2019-007, project 3.1). M.S. and N.S. acknowledge the support from Khalifa University . Prof. Georgios Karanikolos and Dr. Suresh Kuppireddy are acknowledged for providing some of the BET measurements presented in this study. Dr. Grzegorz Brudecki is acknowledged for technical support at the GC–MS.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/8/25
Y1 - 2021/8/25
N2 - Commercial TiO2 (P25) and synthesized TiO2 nanorods (TNR) decorated by either Pt or Au nanoparticles, were used in the butyric acid photoreforming (BAPR) and characterized by XRD, TEM/EDS, porosimetry, and DRS. The selectivity toward a wide range of products (H2, CO2, alkanes, alkenes, organic acids) was investigated under three different irradiation sources (UV, vis, UV + vis). Butyric acid conversion (XBA) and the selectivity to H2 (SH2), propane (SC3H8), propene (SC3H6) are suggested to be mainly affected by holes in the TiO2 valence band, electrons over the noble metal, electrons in the TiO2 conduction band, and holes over the metal, respectively. The highest XBA and SH2 were recorded with Pt/P25 under UV, whereas the largest SC3H8 and SC3H6 were observed with Au/TNR under UV + vis. First-principles calculations were performed with the aid of density functional theory, to investigate the energetic properties of metal/oxide structures and further elucidate the photocatalytic mechanism observed in the experiments.
AB - Commercial TiO2 (P25) and synthesized TiO2 nanorods (TNR) decorated by either Pt or Au nanoparticles, were used in the butyric acid photoreforming (BAPR) and characterized by XRD, TEM/EDS, porosimetry, and DRS. The selectivity toward a wide range of products (H2, CO2, alkanes, alkenes, organic acids) was investigated under three different irradiation sources (UV, vis, UV + vis). Butyric acid conversion (XBA) and the selectivity to H2 (SH2), propane (SC3H8), propene (SC3H6) are suggested to be mainly affected by holes in the TiO2 valence band, electrons over the noble metal, electrons in the TiO2 conduction band, and holes over the metal, respectively. The highest XBA and SH2 were recorded with Pt/P25 under UV, whereas the largest SC3H8 and SC3H6 were observed with Au/TNR under UV + vis. First-principles calculations were performed with the aid of density functional theory, to investigate the energetic properties of metal/oxide structures and further elucidate the photocatalytic mechanism observed in the experiments.
KW - Butyric acid
KW - Hydrocarbons
KW - Hydrogen
KW - Photoreforming
KW - Titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=85112749966&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2021.118321
DO - 10.1016/j.apcata.2021.118321
M3 - Article
AN - SCOPUS:85112749966
SN - 0926-860X
VL - 624
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
M1 - 118321
ER -