Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/246935
DC FieldValue
dc.titlePOLYOXOMETALATE-BASED CATALYSTS FOR LOW-TEMPERATURE AEROBIC METHANE OXIDATION
dc.contributor.authorWANG SIKAI
dc.date.accessioned2024-01-31T18:00:53Z
dc.date.available2024-01-31T18:00:53Z
dc.date.issued2023-08-16
dc.identifier.citationWANG SIKAI (2023-08-16). POLYOXOMETALATE-BASED CATALYSTS FOR LOW-TEMPERATURE AEROBIC METHANE OXIDATION. ScholarBank@NUS Repository.
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/246935
dc.description.abstractThe oxidation of methane to methanol using molecular oxygen represents an attractive but challenging route for methane upgrading. Polyoxometalates (POMs) possess great potential as oxidation catalysts but have been underexplored for methane oxidation. Herein, a Cs+-precipitated Pd-containing phosphomolybdate (Pd/CsPMA) is first synthesized and adopted for room-temperature aerobic methane oxidation. The as-prepared Pd/CsPMA, once facilely activated by H2, converts methane and O2 almost exclusively to methanol at room temperature. Mechanism studies reveal that partially reduced PMA offers the sites for O2 and methane activation, while Pd promotes H2 activation and H spillover for PMA reduction. The following projects improve the activity of Pd/CsPMA by active site adjustments and hydrophobization. Vanadium substitution, sulfite coordination and oleylamine modification are demonstrated effective to enhance methanol productivity without hampering selectivity. The increased electron density around the active site and improved surface hydrophobicity are proposed crucial for enhancing methane activation over reduced PMA.
dc.language.isoen
dc.subjectpolyoxometalate, aerobic methane oxidation, hydrogen spillover, active oxygen species, reduced molybdenum sites, hydrophobic modification
dc.typeThesis
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.contributor.supervisorNing Yan
dc.contributor.supervisorQian He
dc.description.degreePh.D
dc.description.degreeconferredDOCTOR OF PHILOSOPHY (CDE-ENG)
dc.identifier.orcid0009-0004-6761-2236
Appears in Collections:Ph.D Theses (Open)

Show simple item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
WangSK.pdf10.63 MBAdobe PDF

OPEN

NoneView/Download

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.