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Title: Enhanced catalytic performance of CeO 2 confined inside carbon nanotubes for dehydrogenation of ethylbenzene in the presence of CO 2
Authors: Rao, R.
Zhang, Q.
Liu, H.
Yang, H.
Ling, Q.
Yang, M.
Zhang, A.
Chen, W. 
Keywords: Carbon nanotubes
CeO 2
CO 2
Issue Date: Nov-2012
Citation: Rao, R., Zhang, Q., Liu, H., Yang, H., Ling, Q., Yang, M., Zhang, A., Chen, W. (2012-11). Enhanced catalytic performance of CeO 2 confined inside carbon nanotubes for dehydrogenation of ethylbenzene in the presence of CO 2. Journal of Molecular Catalysis A: Chemical 363-364 : 283-290. ScholarBank@NUS Repository.
Abstract: Carbon nanotubes (CNTs) filled with CeO 2 particles are prepared by wet impregnation assisted by capillary force. Compared to CeO 2 outside CNTs, these composites show superior catalytic performance of oxidative dehydrogenation (ODH) of ethylbenzene (EB) to styrene in the presence of CO 2. Transmission electron microscopy, temperature-programmed reduction, Raman and X-ray photoelectron spectroscopy are used to investigate the effect of CNT confinement on the catalytic performance of CeO 2 inside CNTs. The results indicate that CNT tubular structure results in strengthened interaction between CeO 2 and inner wall, which induces distortion and reducibility of CeO 2 lattices to promote the activation of surface lattice oxygen and the formation of oxygen vacancy. The activated surface oxygen and oxygen vacancy from CeO 2-CNT composites play an important role in two-step ODH reaction by promoting reverse water-gas shift reaction. In addition, CeO 2 filled into shorter CNTs exhibits higher catalytic activities due to decreasing the diffusion resistance of reactants and products in CNT channels. The fact that CeO 2-CNT composites exhibit excellent thermostability in the atmosphere of CO 2 provides a positive choice for enhancing catalytic efficiency at elevated temperature using CNTs as supports. © 2012 Elsevier B.V.
Source Title: Journal of Molecular Catalysis A: Chemical
ISSN: 13811169
Appears in Collections:Staff Publications

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