Surface characterization of 'V IND.2''O IND.5'/Ti'O IND.2' catalytic system - Rodella, Cristiane Barbieri; Nascente, Pedro A. P.; Mastelaro, Valmor Roberto; Franco, Roberto Weider de Assis; Zucchi, Maria do Rosário; Magon, Claudio José; Donoso, José Pedro; Florentino, Ariovaldo de Oliveira (Brazilian-German Workshop on Applied Surface Science, 2001)