Modifying perovskite-type oxide catalyst LaNiO3 with Ce for carbon dioxide reforming of methane

Yun Jie Su, Kuan Lun Pan, Moo Been Chang

研究成果: 雜誌貢獻期刊論文同行評審

70 引文 斯高帕斯(Scopus)

摘要

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.

原文???core.languages.en_GB???
頁(從 - 到)4917-4925
頁數9
期刊International Journal of Hydrogen Energy
39
發行號10
DOIs
出版狀態已出版 - 26 3月 2014

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