TY - JOUR
T1 - Enhancement of photocatalytic NOx abatement on titania via additional metal oxide NOx-storage domains: Interplay between surface acidity, specific surface area, and humidity
AU - Caglayan, Mustafa
AU - Irfan, Muhammad
AU - Ercan, Kerem Emre
AU - Kocak, Yusuf
AU - Ozensoy, Emrah
N1 - KAUST Repository Item: Exported on 2021-07-13
Acknowledgements: EO, MI, MC acknowledge the financial support from the Scientific and Technological Research Council of Turkey (TUBITAK) (Project Code: 116M435). Authors thank SASOL GmbH for providing PURALOX SBa200 γ-AlO materials. EO acknowledges the scientific collaboration with TARLA project founded by the Ministry of Development of Turkey (project code: DPT2006K – 120,470). Authors also acknowledge Zehra Aybegüm Ok for her support in ex-situ FTIR experiments.
PY - 2020
Y1 - 2020
N2 - In this work, we propose a simple and effective preparation procedure to obtain ternary mixed oxides composed of titania (TiO2, P25), alumina (γ-Al2O3) and calcium oxide (CaO) functioning as efficient photocatalytic NOx oxidation and storage (PHONOS) catalysts that are capable of facile NOx abatement under ambient conditions in the absence of elevated temperatures and pressures with UVA irradiation. In this architecture, titania was the photocatalytic active component and CaO and/or γ-Al2O3 provided NOx storage domains revealing dissimilar specific surface areas (SSA) and surface acidities. We show that photocatalyst formulation can be readily fine-tuned to achieve superior photocatalytic performance surpassing conventional P25 benchmark in short (1 h) and long term (12 h), as well as humidity-dependent photocatalytic tests. We demonstrate the delicate interplay between the surface acidity, SSA and humidity and provide detailed mechanistic insights regarding the origin of photocatalytic activity, selectivity and deactivation pathways.
AB - In this work, we propose a simple and effective preparation procedure to obtain ternary mixed oxides composed of titania (TiO2, P25), alumina (γ-Al2O3) and calcium oxide (CaO) functioning as efficient photocatalytic NOx oxidation and storage (PHONOS) catalysts that are capable of facile NOx abatement under ambient conditions in the absence of elevated temperatures and pressures with UVA irradiation. In this architecture, titania was the photocatalytic active component and CaO and/or γ-Al2O3 provided NOx storage domains revealing dissimilar specific surface areas (SSA) and surface acidities. We show that photocatalyst formulation can be readily fine-tuned to achieve superior photocatalytic performance surpassing conventional P25 benchmark in short (1 h) and long term (12 h), as well as humidity-dependent photocatalytic tests. We demonstrate the delicate interplay between the surface acidity, SSA and humidity and provide detailed mechanistic insights regarding the origin of photocatalytic activity, selectivity and deactivation pathways.
UR - http://hdl.handle.net/10754/670144
UR - https://linkinghub.elsevier.com/retrieve/pii/S0926337319309749
UR - http://www.scopus.com/inward/record.url?scp=85074396019&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2019.118227
DO - 10.1016/j.apcatb.2019.118227
M3 - Article
SN - 1873-3883
VL - 263
SP - 118227
JO - APPLIED CATALYSIS B-ENVIRONMENTAL
JF - APPLIED CATALYSIS B-ENVIRONMENTAL
ER -