| Full text | |
| Author(s): |
Garcia, Amanda C.
;
Birdja, Yuvraj Y.
;
Tremiliosi-Filho, Germano
;
Koper, Marc T. M.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | JOURNAL OF CATALYSIS; v. 346, p. 117-124, FEB 2017. |
| Web of Science Citations: | 34 |
| Abstract | |
Herein we describe the role of Bi adatom irreversibly adsorbed on platinum single-crystal electrodes toward the oxidation of glycerol. Our results show that the presence of bismuth on the Pt(111) electrode improves the activity of the reaction, by preventing the adsorption of poisoning intermediates such as carbon monoxide, as well as the selectivity to dihydroxyacetone, while on the Pt(100)/Bii electrode, the presence of a strongly bound glycerol-related adsorbate and a small amount of linearly bonded carbon monoxide causes a decrease in the activity. Significantly, the presence of bismuth on Pt(100) does not change its tendency to produce only glyceraldehyde as the primary product of the oxidation of glycerol. The increase in the selectivity to DHA on Pt(111)/Bi-ir, is attributed to the interaction of the Bi adatom with the enediol intermediate, an adsorbed intermediate that exists on Pt(1 11) but not on Pt(100). The enediol is the key intermediate in the isomerization reaction between glyceraldehyde and dihydroxyacetone, and the stabilization of this intermediate by the interaction with the bismuth enhances the rate of the isomerization reaction toward the thermodynamically most stable isomer, namely dihydroxyacetone. (C) 2016 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license. (AU) | |
| FAPESP's process: | 14/24438-8 - Conversion of alcohol into added-value products. a mechanistic study on single crystal electrodes |
| Grantee: | Amanda Cristina Garcia |
| Support type: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 12/10856-7 - Investigation of the mechanism of glycerol electro-oxidation on metallic nanoparticles |
| Grantee: | Amanda Cristina Garcia |
| Support type: | Scholarships in Brazil - Post-Doctorate |