Química Nova Print version ISSN 0100-4042 Quím. Nova vol.22 n.5 São Paulo Sept./Oct. 1999 http://dx.doi.org/10.1590/S0100-40421999000500009 ARTIGO Estudo por espectroscopia no infravermelho da interação metal-suporte em Pt/TiO 2 . A influência da adsorção de hidrogênio Edilson V. Benvenutti* Instituto de Química - UFRGS - CP 15003 - 91501-970 - Porto Alegre - RS Celso U. Davanzo Instituto de Química - UNICAMP - CP 6154 - 13081-970 - Campinas - SP Recebido em 16/7/98; aceito em 21/1/99 An infrared spectroscopy study of metal-support interaction on Pt/TiO 2 . The influence of hydrogen adsorption. The influence of the presence of hydrogen on Pt/TiO 2 catalysts submitted to reduction treatment has been studied by FT-IR at room temperature. After submitting to LTR treatment, the hydrogen spillover has been detected and the presence of hydrogen at the bulk is shown to produce a strong absorption in the infrared spectral region. After HTR treatment, the hydrogen is strongly chemissorbed. Keywords: SMSI; metal-support; hydrogen spillover.