Enhancing Pt-Ni/CeO2 performances for ethanol reforming by catalyst supporting on high surface silica

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/N-2 as well as H2O/C2H5OH/AIR mixture between 300 and 600 degrees C at different space velocities (10000-30000 h(-1)). Ethanol conversion, for both steam (ESR) and oxidative steam reforming (OSR) reactions, was not affected by contact time decrease at T > 480 degrees C while at lower temperatures, the space velocity growth led to reduced C2H5OH conversion, more pronounced when tests were performed without O-2 co-feeding. Moreover, the catalysts showed high resistance to deactivation during reforming tests at 500 degrees C and 20000 h(-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 3500 min, 1000 min more than ESR case.