TY - JOUR
T1 - Steam reforming of ethanol over Ni/Al2O3-La 2O3 catalysts synthesized by sol-gel
AU - Carrera Cerritos, Raúl
AU - Fuentes Ramírez, Rosalba
AU - Aguilera Alvarado, Alberto F.
AU - Martínez Rosales, J. Merced
AU - Viveros García, Tomás
AU - Galindo Esquivel, Ignacio R.
PY - 2011/3/2
Y1 - 2011/3/2
N2 - The activity of Ni/Al2O3-La2O3 catalysts prepared by sol-gel process for hydrogen production using ethanol steam reforming was studied. The effect of Ni and La loading in the reaction activity and hydrogen selectivity was analyzed. The catalytic measurements were performed on a fixed-bed microreactor for a 6 h period; within this time, the catalysts showed partial deactivation. The catalyst containing 12 wt % La showed the highest yield to H2, but it also presented the highest deactivation. The other catalysts with the same Ni loading showed a decrease in H2 yield over time. The increase of Ni loading from 5 to 10 wt % caused an increase in H2 and CO yields in all La containing catalysts. The catalyst supported on sol-gel synthesized alumina showed the highest activity after 6 h on stream. This catalyst showed the lowest deactivation from all the systems that were studied. Polymeric and graphitic carbon were identified by DTA analysis of the spent catalysts. TGA analysis showed that the total coke deposited after reaction followed the trend: Ni/Al > Ni/12La ≈ Ni/8La > Ni/5La. However, less graphitic coke was identified on the catalysts as the lantana loading increased in the supports. Additionally, TEM results indicate that the radius of the graphite tubes decreased as the concentration of La in the support increased. A slight increase of H2 and CO2 yields was obtained when the water to ethanol mole ratio increased from 3 to 6. Higher deactivation was observed when more steam was fed to the reaction, even when lower carbon contents were determined by DTA-TGA analysis.
AB - The activity of Ni/Al2O3-La2O3 catalysts prepared by sol-gel process for hydrogen production using ethanol steam reforming was studied. The effect of Ni and La loading in the reaction activity and hydrogen selectivity was analyzed. The catalytic measurements were performed on a fixed-bed microreactor for a 6 h period; within this time, the catalysts showed partial deactivation. The catalyst containing 12 wt % La showed the highest yield to H2, but it also presented the highest deactivation. The other catalysts with the same Ni loading showed a decrease in H2 yield over time. The increase of Ni loading from 5 to 10 wt % caused an increase in H2 and CO yields in all La containing catalysts. The catalyst supported on sol-gel synthesized alumina showed the highest activity after 6 h on stream. This catalyst showed the lowest deactivation from all the systems that were studied. Polymeric and graphitic carbon were identified by DTA analysis of the spent catalysts. TGA analysis showed that the total coke deposited after reaction followed the trend: Ni/Al > Ni/12La ≈ Ni/8La > Ni/5La. However, less graphitic coke was identified on the catalysts as the lantana loading increased in the supports. Additionally, TEM results indicate that the radius of the graphite tubes decreased as the concentration of La in the support increased. A slight increase of H2 and CO2 yields was obtained when the water to ethanol mole ratio increased from 3 to 6. Higher deactivation was observed when more steam was fed to the reaction, even when lower carbon contents were determined by DTA-TGA analysis.
UR - http://www.scopus.com/inward/record.url?scp=79951997882&partnerID=8YFLogxK
U2 - 10.1021/ie100636f
DO - 10.1021/ie100636f
M3 - Artículo
AN - SCOPUS:79951997882
SN - 0888-5885
VL - 50
SP - 2576
EP - 2584
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 5
ER -
