Etude in situ par EXAFS de la reaction de reformage sur les systemes Pt/Al_2O_3 et PtRe/Al_2O_3 sulfures

摘要

EXAFS has been used to follow in situ the structural evolution of sulfided Pt/Al2Q3-O and PtRe/Al2O3-Cl catalysts during the hydrocarbon reaction (T=500°C, P(H2) = 8 bars H2 : H-C7H16 = 1:1 and T=300°C, PCH2) = 3 bars, H2 : 11-C7H16 = 1:1). The hydrocarbon conversion was monitored, via on line analysis, with a gas chromatograph. For the monometallic, we observe a sintering of the metal particles. In the case of sulfided PtRe/Al2Q3-Cl catalysts no sintering of the metallic particles was observed.