Synergistic effect of manganese on zirconia and ceria supports for improving photoreduction of CO$_2$Vikram Sagar, Tatiparthi (Avtor) Kumar, Praveen (Avtor) Filip Edelmannová, Miroslava (Avtor) Ricka, Rudolf (Avtor) Reli, Martin (Avtor) Kočí, Kamila (Avtor) Nadrah, Peter (Avtor) Emin, Saim (Avtor) Sever Škapin, Andrijana (Avtor) Lavrenčič Štangar, Urška (Avtor) carbon dioxide reductioncerium(IV) oxidezirconium dioxidephotocatalysisMn-modified photocatalystCO$_2$ reductionCeO$_2$ZrO$_2$Photocatalytic CO$_2$ reduction in the liquid phase at neutral pH conditions has been studied employing high surface area Mn-modified cubic CeO$_2$ and amorphous ZrO$_2$ catalysts. Results of the photocatalytic reduction of CO$_2$ to methane are promising on Mn-modified ZrO$_2$ and comparable with the noble metal-based photocatalysts. The surface area of both supports CeO$_2$ and ZrO$_2$ increased with Mn addition. Two broad diffraction peaks in X-ray diffractograms indicate that the ZrO$_2$ support is in the amorphous phase and Mn addition showed no considerable change. High intense diffraction peaks for CeO$_2$ support illustrated the cubic fluorite phase and Mn addition to CeO$_2$ support decreased the crystallite size due to the incorporation of Mn ions into the CeO$_2$ lattice. XPS study revealed the stabilization of Mn in a lower oxidation state i.e., Mn$^{2+}$ and Mn$^{3+}$, with ZrO$_2$ support than with CeO$_2$ support. The superior specific capacitance of the Mn-modified ZrO$_2$ catalyst indicates the enhanced synergy of active Mn species and support. Among the studied catalysts, Mn-modified ZrO$_2$ photocatalyst exhibited the highest activity and selectivity for photoreduction of CO$_2$ to methane and CO.20242024-04-17 07:54:03Članek v reviji155766sl