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| Author(s): |
Melina D'Villa Silva
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Química de São Carlos (IQSC/BT) |
| Defense date: | 2010-09-17 |
| Examining board members: |
Germano Tremiliosi Filho;
Antonio Carlos Dias Angelo;
Paulo Olivi;
Joelma Perez;
Ernesto Chaves Pereira de Souza
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| Advisor: | Germano Tremiliosi Filho |
| Abstract | |
In this work, carbon dispersed catalysts containing Pt, PtRh and PtRhRu were studied for electroxidation of ethanol. The catalysts were prepared using ultrasound and characterized by EDX, XRD and TEM and its catalytic activity studied using the techniques of cyclic voltammetry and DEMS. Experimental results indicated that the addition of rhodium decreases the potential onset of ethanol oxidation, but also decrease the faradaic current. DEMS studies showed that the presence of rhodium promotes an increase in CO2 production. Because of this, fundamental studies on single crystal of Pt (111), Pt (110) and Pt (100) modified with Rh deposits were done. The deposits were made by electrochemical method and different degrees of coatings were studied for ethanol electroxidation The catalytic activity was evaluated by cyclic voltammetry, chronoamperometry and in situ FTIR. The results showed that the greater the amount of rhodium on the surface the lower the current obtained in the oxidation of ethanol. Among the electrodes studied monocrystalline Pt (100) showed the best activity for ethanol oxidation. (AU) | |
| FAPESP's process: | 04/07308-1 - Electrochemical oxidation of ethanol in Pt-Rh-Ru electrodes dispersed in carbon: study of the effect of composition and particle size in the selectivity and mechanism of reaction |
| Grantee: | Melina D'Villa Silva |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |