Heterostructured CeO2–M (M = Co, Cu, Mn, Fe, Ni) Oxide Nanocatalysts for the Visible-Light Photooxidation of Pinene to Aroma Oxygenates | Zendy

Mlungisi A. Mavuso | Zendy; Peter R. Makgwane | Zendy; Suprakas Sinha Ray | Zendy

Open Access

Heterostructured CeO₂–M (M = Co, Cu, Mn, Fe, Ni) Oxide Nanocatalysts for the Visible-Light Photooxidation of Pinene to Aroma Oxygenates

Author(s) -

Mlungisi A. Mavuso,

Peter R. Makgwane,

Suprakas Sinha Ray

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.9b04396

Subject(s) - nanomaterial based catalyst , catalysis , visible spectrum , photochemistry , non blocking i/o , photocatalysis , oxygenate , oxide , materials science , absorption (acoustics) , pinene , chemistry , inorganic chemistry , organic chemistry , optoelectronics , composite material

Herein, we report the enhanced photocatalytic activity of heterostructured CeO 2 nanocatalysts interfaced with Cu, Co, Ni, Mn, and Fe metal oxides. The CeO 2 catalysts exhibited an enhanced red shift in the visible-light response compared to CeO 2 . This improved absorption range effectively suppressed electron (e - )/hole ( + h) recombination by forming localized energy bands associated with defect oxygen vacancies ( V o ) induced by the M n+ ions incorporated in CeO 2 . Under visible-light irradiation, CeO 2 catalysts are active for α-pinene oxidation to the aroma oxygenates, pinene oxide, verbenol, and verbenone. Both Fe 2 O 3 -CeO 2 and NiO-CeO 2 gave the highest pinene conversions of 71.3 and 53.1%, respectively, with corresponding pinene oxide selectivities of 57.3 and 58.2%. The enhanced photocatalytic performance of the heterostructured CeO 2 catalysts compared to CeO 2 is attributed to their enhanced visible-light absorption range and efficient suppression of e - / + h recombination. The Fe 2 O 3 -CeO 2 catalyst was highly recyclable and did not show any significant loss of its photoactivity.

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