276308 Sulfated ZrO2 Supported On Multi-Walled Carbon Nanotubes (MWCNT)

Wednesday, October 31, 2012: 3:55 PM
319 (Convention Center )
Changchang Liu1, Sungchul Lee2, Dong Su3, Lisa Pfefferle1 and Gary L. Haller1, (1)Chemical and Environmental Engineering, Yale University, New Haven, CT, (2)Energy Laboratory, Corporate R&D Center, Samsung SDI Co., Ltd, Gyeonggi-do, 446-577, South Korea, (3)Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY

In this paper, we discuss the synthesis of a composite of ZrO2 nanoparticles supported on multi-walled carbon nanotubes (MWCNT). Using X-ray diffraction and high-resolution transmission electron microscopy (HR-TEM), the ZrO2 particles were found to be 2-3 nm tetragonal crystalline nanoparticles. Strong interfacial interaction between the ZrO2 nanoparticles and the MWCNT surface was observed by near-edge X-ray absorption fine structure spectroscopy (NEXAFS) at the carbon K-edge and the oxygen K-edge, and this strong metal-oxide/support interaction leads to small ZrO2 particle size with both thermal stability (to 750°C) and hydrothermal stability (to 200°C in liquid water). The ZrO2/MWCNT was converted into a solid acid catalyst by sulfation and the properties of S-ZrO2/MWCNT were studied by X-ray absorption and catalytic probe reaction(s). The nature of its acid sites was probed by S K-edge and Zr L-edges (LI, LII, LIII) XANES and catalytic cracking of cyclohexane. Such composites good candidates for potential catalysis applications in fuel cell electrodes and biomass processing.

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