Durndell, LJ;
Cucuzzella, C;
Parlett, CMA;
Isaacs, MA;
Wilson, K;
Lee, AF;
(2019)
Platinum catalysed aerobic selective oxidation of cinnamaldehyde to cinnamic acid.
Catalysis Today
, 333
pp. 161-168.
10.1016/j.cattod.2018.02.052.
Preview |
Text
Isaacs_Platinum catalysed aerobic selective oxidation of cinnamaldehyde to cinnamic acid_AAM.pdf - Accepted Version Download (1MB) | Preview |
Abstract
Aerobic selective oxidation of allylic aldehydes offers an atom and energy efficient route to unsaturated carboxylic acids, however suitable heterogeneous catalysts offering high selectivity and productivity have to date proved elusive. Herein, we demonstrate the direct aerobic oxidation of cinnamaldehyde to cinnamic acid employing silica supported Pt nanoparticles under base-free, batch and continuous flow operation. Surface and bulk characterisation of four families of related Pt/silica catalysts by XRD, XPS, HRTEM, CO chemisorption and N_{2} porosimetry evidence surface PtO_{2} as the common active site for cinnamaldehyde oxidation, with a common turnover frequency of 49,000 ± 600 h^{-1}; competing cinnamaldehyde hydrogenolysis is favoured over metallic Pt. High area mesoporous (SBA-15 or KIT-6) and macroporous-mesoporous SBA-15 silicas confer significant rate and cinnamic acid yield enhancements versus low area fumed silica, due to superior platinum dispersion. High oxygen partial pressures and continuous flow operation stabilise PtO_{2} active sites against in-situ reduction and concomitant deactivation, further enhancing cinnamic acid productivity.
| Type: | Article |
|---|---|
| Title: | Platinum catalysed aerobic selective oxidation of cinnamaldehyde to cinnamic acid |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.cattod.2018.02.052 |
| Publisher version: | https://doi.org/10.1016/j.cattod.2018.02.052 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Platinum, Cinnamaldehyde, Oxidation, Porous, Silica |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10076384 |
Archive Staff Only
 |
View Item |
