TY - JOUR
T1 - Heterostructured CeO2-M (M = Co, Cu, Mn, Fe, Ni) Oxide Nanocatalysts for the Visible-Light Photooxidation of Pinene to Aroma Oxygenates
AU - Mavuso, Mlungisi A.
AU - Makgwane, Peter R.
AU - Ray, Suprakas Sinha
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020
Y1 - 2020
N2 - Herein, we report the enhanced photocatalytic activity of heterostructured CeO2 nanocatalysts interfaced with Cu, Co, Ni, Mn, and Fe metal oxides. The CeO2 catalysts exhibited an enhanced red shift in the visible-light response compared to CeO2. This improved absorption range effectively suppressed electron (e-)/hole (+h) recombination by forming localized energy bands associated with defect oxygen vacancies (Vo) induced by the Mn+ ions incorporated in CeO2. Under visible-light irradiation, CeO2 catalysts are active for α-pinene oxidation to the aroma oxygenates, pinene oxide, verbenol, and verbenone. Both Fe2O3-CeO2 and NiO-CeO2 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 CeO2 catalysts compared to CeO2 is attributed to their enhanced visible-light absorption range and efficient suppression of e-/+h recombination. The Fe2O3-CeO2 catalyst was highly recyclable and did not show any significant loss of its photoactivity.
AB - Herein, we report the enhanced photocatalytic activity of heterostructured CeO2 nanocatalysts interfaced with Cu, Co, Ni, Mn, and Fe metal oxides. The CeO2 catalysts exhibited an enhanced red shift in the visible-light response compared to CeO2. This improved absorption range effectively suppressed electron (e-)/hole (+h) recombination by forming localized energy bands associated with defect oxygen vacancies (Vo) induced by the Mn+ ions incorporated in CeO2. Under visible-light irradiation, CeO2 catalysts are active for α-pinene oxidation to the aroma oxygenates, pinene oxide, verbenol, and verbenone. Both Fe2O3-CeO2 and NiO-CeO2 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 CeO2 catalysts compared to CeO2 is attributed to their enhanced visible-light absorption range and efficient suppression of e-/+h recombination. The Fe2O3-CeO2 catalyst was highly recyclable and did not show any significant loss of its photoactivity.
UR - http://www.scopus.com/inward/record.url?scp=85084239688&partnerID=8YFLogxK
U2 - 10.1021/acsomega.9b04396
DO - 10.1021/acsomega.9b04396
M3 - Article
AN - SCOPUS:85084239688
SN - 2470-1343
JO - ACS Omega
JF - ACS Omega
ER -