Eletrodos monocristalinos de platina para eletrocatálise de oxidação de metano

Ano: 2010 | Volume: 2 | Número: 3

Autores: Mayara Munaretto, Douglas Henrique Fockink, Valderi Pacheco Santos

Palavras-chave: platinum single crystal electrodes, electrooxidation of methane, titanium deposition, electrocatalysis

Resumo Inglês:

The main objective of this paper is to characterize the voltammetric profiles
of platinum single crystals of low Miller indexes Pt(100) and Pt(110) and study their
catalytic activities on the oxidation of methane. In this way, it was developed a metallic
surface modified by presence of other metal oxide, which presents catalytic activity for
this reaction. It is well known that the electrooxidation of methane (CH4) leads mainly to
the formation of CO2 and H2O, however, the oxidation can also lead to the formation of
CO, a reaction intermediate that has strong interaction with metal surfaces, such as
platinum. This molecule tends to accumulate on the platinum surface and to passive it,
due to the self-poisoning, decreasing its catalytic activity. Therefore, the main aim of this
work was the development of a platinum electrode modified by deposition of titanium
oxide, which presented electrocatalytic properties for the oxidation of methane.