Engineering of Cation Occupancy of CoFe2O4 Oxidation Catalysts by Nanosecond, Single‐Pulse Laser Excitation in Water. Issue 10 (23rd March 2022)

• Record Type: Journal Article
• Authors: Zerebecki, Swen; Salamon, Soma; Landers, Joachim; Yang, Yuke; Tong, Yujin; Budiyanto, Eko; Waffel, Daniel; Dreyer, Maik; Saddeler, Sascha; Kox, Tim; Kenmoe, Stephane; Spohr, Eckhard; Schulz, Stephan; Behrens, Malte; Muhler, Martin; Tüysüz, Harun; Kramer Campen, R.; Wende, Heiko; Reichenberger, Sven; Barcikowski, Stephan
• Is Part Of: ChemCatChem. Volume 14:Issue 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-23
• Subjects: reactive laser processing -- cation occupancy -- inverse spinel -- oxidation catalysis -- defects; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202101785
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Due to the variability of the cation occupancy of octahedral and tetrahedral sites, spinel ferrites and cobaltites are particularly interesting to investigate activity trends in oxidation catalysis. Yet, the preparation of the respective catalyst series remains challenging. We employed pulsed laser defect engineering of CoFe2 O4 nanoparticles in water to gradually alter the cation occupancy of octahedral and tetrahedral sites by single laser pulses and study its effect on cinnamyl alcohol oxidation. Three CoFe2 O4 catalysts from different synthesis methods resembling different initial site occupancy were chosen as starting materials. The laser‐induced randomization of the cation occupancy was verified by Mössbauer spectroscopy and linearly correlated with the conversion of cinnamyl alcohol while the size and Co : Fe ratio was maintained during laser processing. The study solidifies the importance of octahedral Co 3+ ‐sites and the feasibility of pulsed laser processing for altering the cation occupancy and related crystallographic defect density in oxidation catalysis. Abstract : Activity trends : Pulsed laser defect engineering of CoFe2 O4 nanoparticles in water was employed. The catalyst surface and the cation occupancy of octahedral and tetrahedral sites was gradually altered with single laser pulses. The laser‐induced randomization of the cation occupancy was verified by Mössbauer spectroscopy and linearly correlated with the conversion of cinnamyl alcohol solidifying the importance of octahedral Co 3+ ‐sites in oxidation catalysis.