Journal
CHEMICAL ENGINEERING JOURNAL
Volume 170, Issue 2-3, Pages 457-463Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.12.042
Keywords
Nano cobalt-composite catalyst; Mn doping; CeO2-ZrO2; Oxygen mobility; Methane dry reforming with CO2; High catalytic performance
Categories
Funding
- National Basic Research Program of China [2011CB201202]
- National Natural Science Foundation of China [20776089]
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The Mn doping nanocrystalline Co-Ce-Zr-O-x catalysts were prepared by the co-precipitation method and characterized by various physico-chemical characterization techniques such as X-ray diffraction (XRD), temperature- programmed reduction (TPR), O-2 temperature-programmed desorption (O-2-TPD). X-ray photoelectron spectroscopy (XPS) and temperature-programmed hydrogenation (TPH). Their catalytic performances for methane reforming with CO2 to hydrogen and carbon monoxide were investigated. Adding Mn remarkably enhanced the catalytic activity and stability of the Co-Ce-Zr-O-x catalyst. The highest catalytic activity and long-term stability was obtained when the molar ratio of Mn/(Ce + Zr + Mn) was 10%. The improved catalytic behavior was closely related to the surface oxygen species and oxygen mobility. In comparison with that of Co-Ce-Zr-O-x catalyst, the migration of bulk lattice oxygen species became easier, and the content of surface oxygen species was higher for the Mn-doped nanocrystalline Co-Ce-Zr-O-x samples. TPH characterization showed that the surface coke species could be easily oxidized into COx for the Mn-doped nano cobalt-composite catalyst due to the higher amount of mobile oxygen. The Mn incorporation promoted the dispersion of the nano-sized CoOx crystallites. In comparison with the impregnated samples, CoOx species dispersed better in the co-precipitated catalysts. (C) 2011 Published by Elsevier B.V.
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