TY - JOUR
T1 - Modifying perovskite-type oxide catalyst LaNiO3 with Ce for carbon dioxide reforming of methane
AU - Su, Yun Jie
AU - Pan, Kuan Lun
AU - Chang, Moo Been
PY - 2014/3/26
Y1 - 2014/3/26
N2 - Perovskite-type oxide catalysts LaNiO3 and La 1-xCexNiO3 (x ≤ 0.5) were prepared by the Pechini method and used as catalysts for carbon dioxide reforming of methane to form synthesis gas (H2 + CO). The gaseous reactants consisted of CO2 and CH4 in a molar ratio of 1:1. At a GHSV of 10,000 hr-1, CH4 conversion over LaNiO3 catalyst increased from 66% at 600 C to 94% at 800 C, while CO2 conversion increased from 51% to 92%. The achieved selectivities of CO and H2 were 33% and 57%, respectively, at 600 C. To prevent the deposition of carbon and the sintering nickel species, some of the Ni in perovskite-type oxide catalyst was substituted by Ce. Ce provided lattice oxygen vacancies, which activated C-H bonds, and increased the selectivity of H2 to 61% at 600 C. XRD analysis indicates that the catalyst exhibited a typical perovskite spinel structure and formed La2O2CO3 phases after CO2 reforming. The FE-SEM results reveal carbon whisker of the LaNiO3 catalyst and the BET analysis indicates that the specific surface area increases after the reforming reaction. The H2-TPR results confirm that Ce metals can store and provide oxygen.
AB - Perovskite-type oxide catalysts LaNiO3 and La 1-xCexNiO3 (x ≤ 0.5) were prepared by the Pechini method and used as catalysts for carbon dioxide reforming of methane to form synthesis gas (H2 + CO). The gaseous reactants consisted of CO2 and CH4 in a molar ratio of 1:1. At a GHSV of 10,000 hr-1, CH4 conversion over LaNiO3 catalyst increased from 66% at 600 C to 94% at 800 C, while CO2 conversion increased from 51% to 92%. The achieved selectivities of CO and H2 were 33% and 57%, respectively, at 600 C. To prevent the deposition of carbon and the sintering nickel species, some of the Ni in perovskite-type oxide catalyst was substituted by Ce. Ce provided lattice oxygen vacancies, which activated C-H bonds, and increased the selectivity of H2 to 61% at 600 C. XRD analysis indicates that the catalyst exhibited a typical perovskite spinel structure and formed La2O2CO3 phases after CO2 reforming. The FE-SEM results reveal carbon whisker of the LaNiO3 catalyst and the BET analysis indicates that the specific surface area increases after the reforming reaction. The H2-TPR results confirm that Ce metals can store and provide oxygen.
KW - CO reforming of methane
KW - Hydrogen production
KW - Perovskite-type oxide
KW - Syngas
UR - http://www.scopus.com/inward/record.url?scp=84897925822&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2014.01.077
DO - 10.1016/j.ijhydene.2014.01.077
M3 - 期刊論文
AN - SCOPUS:84897925822
VL - 39
SP - 4917
EP - 4925
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 10
ER -