X-ray photoelectron spectroscopy studies on ethylene oxychlorination catalysts

Vetrivel, R. ; Seshan, K. ; Krishnamurthy, K. R. ; Prasada Rao, T. S. R. (1987) X-ray photoelectron spectroscopy studies on ethylene oxychlorination catalysts Bulletin of Materials Science, 9 (2). pp. 75-80. ISSN 0250-4707

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Official URL: http://www.ias.ac.in/j_archive/bms/9/1/75-80/viewp...

Related URL: http://dx.doi.org/10.1007/BF02744285


Copper chloride on alumina catalyst used for oxychlorination of ethylene represents a typical system where copper is in a dynamic equilibrium between Cu+ and Cu++ oxidation states. Surface studies on redox, structural and compositional properties have been undertaken to monitor the changes that occur on the catalyst during use and pinpoint causes for its deactivation. For this, a fresh and a spent catalyst were been chosen for characterization. A core consisting of copper in Cu+ state and present as CuAlO2 is formed at the centre of the catalyst sphere. Formation of such a nonreversible phase under reaction conditions upsets the redox equilibrium. XPS also shows the absence of potassium in the core and its precipitation as a new phase on use, probably KCl, formed by the decomposition of active component KCuCl3. These factors facilitate deactivation.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Oxychlorination; Deactivation; X-ray Photoelectron Spectra; CuAlO2; KCuCl3
ID Code:36283
Deposited On:13 Mar 2012 11:38
Last Modified:17 May 2016 19:15

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