Abstract
Chemical looping reforming (CLR) technique is a prospective option for hydrogen production. Improving oxygen mobility and sintering resistance are still the main challenges of the development of high-performance oxygen carriers (OCs) in the CLR process. This paper explores the performance of Ni/CeO2 nanorod (NR) as an OC in CLR of ethanol. Various characterization methods such as N2 adsorption-desorption, X-ray diffraction (XRD), Raman spectra, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (TPR), and H2 chemisorption were utilized to study the properties of fresh OCs. The characterization results show the Ni/CeO2-NR possesses high Ni dispersion, abundant oxygen vacancies, and strong metal-support interaction. The performance of prepared OCs was tested in a packed-bed reactor. H2 selectivity of 80% was achieved by Ni/CeO2-NR in 10-cycle stability test. The small particle size and abundant oxygen vacancies contributed to the water gas shift reaction, improving the catalytic activity. The covered interfacial Ni atoms closely anchored on the underlying surface oxygen vacancies on the (111) facets of CeO2-NR, enhancing the anti-sintering capability. Moreover, the strong oxygen mobility of CeO2-NR also effectively eliminated surface coke on the Ni particle surface.
Highlights
Hydrogen is considered an efficient energy carrier that is environmentally benign [1].Chemical looping reforming (CLR) is a prospective alternative for hydrogen production due to its energy efficiency and inherent CO2 capture [2,3]
The performances of the are tested in a packed-bed reactor and compared with the performances of the Ni/CeO2-NR 2OC are tested in a packed-bed reactor and compared with the other other reference bulki.e., oxygen carriers (OCs),Ni/CeO
A Ni/CeO2 -NR OC was synthesized by hydrothermal method and tested in CLR of ethanol process in this work
Summary
Hydrogen is considered an efficient energy carrier that is environmentally benign [1]. Chemical looping reforming (CLR) is a prospective alternative for hydrogen production due to its energy efficiency and inherent CO2 capture [2,3]. That the oxygen of CeO2 eliminate surface eliminate coke deposition, steam, and shorten the “dead time” in CLR time”. CeO2 lattice precursors, keeping the OC keeping surface free of coke deposition. MSI andthat the can oxidize coke precursors, the OC surface free of coke deposition It has been mobility of lattice oxygen show strong dependence on the morphology of [21]. MSI and the mobility of lattice oxygen show strong dependence on the morphology of CeO2 [21]. OC are tested in a packed-bed reactor and compared with the performances of the Ni/CeO2-NR 2OC are tested in a packed-bed reactor and compared with the other other reference bulki.e., OC,Ni/CeO i.e., Ni/CeO reference bulk OC, and discussion
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