Enhancement of photocatalytic NOx abatement on titania via additional metal oxide NOx-storage domains: Interplay between surface acidity, specific surface area, and humidity

Mustafa Caglayan, Muhammad Irfan, Kerem Emre Ercan, Yusuf Kocak, Emrah Ozensoy

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

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.
Original languageEnglish (US)
Pages (from-to)118227
JournalAPPLIED CATALYSIS B-ENVIRONMENTAL
Volume263
DOIs
StatePublished - 2020
Externally publishedYes

Bibliographical note

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.

ASJC Scopus subject areas

  • General Environmental Science
  • Catalysis
  • Process Chemistry and Technology

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