Glycerol steam reforming over layered double hydroxide-supported Pt Catalysts

SIMONE M. DE REZENDE; CARLOS A. FRANCHINI; MARIA L DIEUZEIDE; ANDRÉA M. DUARTE DE FARIAS; AMADEO NORMA; MARCO A. FRAGA

CHEMICAL ENGINEERING JOURNAL

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2015 p. 108 - 118

1385-8947

Layered double hydroxides containing Mg and Al (Mg/Al ratios of 3 and 5) were used as support forPt-based catalysts for glycerol steam reforming. Additionally, catalysts supported on the parent MgAlmixed oxides were also evaluated. Fresh catalyst samples were characterized by XRD, BET, TPD-CO2and XRF whilst the spent catalysts were examined by TEM and TPO/TGA-MS. All catalysts revealed tobe active, leading to a hydrogen-rich gas stream but with distinct resistance to deactivation. The catalystsynthesized directly from the layered double hydroxide precursors with Mg/Al ratio of 3 was shown to bemore effective since global and gas conversion are similar, varying within 60?25%. Major incidence ofweak to moderate basic surface centers rendered catalysts more selective, reaching up to 68% selectivityto hydrogen. However, they were not enough to suppress deactivation. It was found that the formation ofmore stable carbon deposits play a key role on deactivation and only a minor contribution from the carbonaceousmaterial formed from the intermediate organic liquid compounds was proposed. Highly dispersedmetal centers were suggested to be important for in situ catalyst surface cleanness