In this paper, bimetallic Pt-Ni/CeO2 catalysts supported over mesoporous silica were employed for ethanol reforming in the low-temperature range. In particular, catalyst behaviour was investigated under a H2O/C2H5OH/N2 as well as H2O/C2H5OH/AIR mixture between 300 and 600Â°C at different space velocities (10000-30000h-1). Ethanol conversion, for both steam (ESR) and oxidative steam reforming (OSR) reactions, was not affected by contact time decrease at T>480Â°C while at lower temperatures, the space velocity growth led to reduced C2H5OH conversion, more pronounced when tests were performed without O2 co-feeding. Moreover, the catalysts showed high resistance to deactivation during reforming tests at 500Â°C and 20000h-1: the improvement of active species dispersion, as a consequence of catalyst formulation enrichment by SiO2 addition, resulted in lower carbon selectivity with respect to the SiO2-free sample. However, the higher extent of coke gasification reaction for OSR further increased catalyst stability and total ethanol conversion was recorded for almost 3500min, 1000min more than ESR case.
|Titolo:||Enhancing Pt-Ni/CeO2 performances for ethanol reforming by catalyst supporting on high surface silica|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||1.1 Articoli su Rivista|