A complete catalytic cycle was performed on CuCl2/Al2O3 catalyst for ethylene oxychlorination at 500 K. X-ray absorption near-edge spectroscopy, extended X-ray absorption fine structure, electron paramagnetic resonance, and IR of adsorbed CO were used to demonstrate that the ethylene oxychlorination reaction, C2H4+2HCl+1/2 O2→C2H4Cl2+H2O, follows a three-step mechanism: (i) reduction of CuCl2 to CuCl (2CuCl2+C2H4→C2H4Cl2+2CuCl), (ii) oxidation of CuCl to give an oxychloride (2CuCl+1/2 O2→Cu2OCl2), and (iii) closure of the catalytic circle by rechlorination with HCl, restoring the original CuCl2 (Cu2OCl2+2HCl→2CuCl2+H2O). The dispersing/sintering effect of the different reagents on the active phase has been also investigated.

Alumina-supported copper chloride 4. Effect of exposure to O2 and HCl

ZECCHINA, Adriano;SPOTO, Giuseppe;BORDIGA, Silvia;FISICARO, Paola;LAMBERTI, Carlo
2002-01-01

Abstract

A complete catalytic cycle was performed on CuCl2/Al2O3 catalyst for ethylene oxychlorination at 500 K. X-ray absorption near-edge spectroscopy, extended X-ray absorption fine structure, electron paramagnetic resonance, and IR of adsorbed CO were used to demonstrate that the ethylene oxychlorination reaction, C2H4+2HCl+1/2 O2→C2H4Cl2+H2O, follows a three-step mechanism: (i) reduction of CuCl2 to CuCl (2CuCl2+C2H4→C2H4Cl2+2CuCl), (ii) oxidation of CuCl to give an oxychloride (2CuCl+1/2 O2→Cu2OCl2), and (iii) closure of the catalytic circle by rechlorination with HCl, restoring the original CuCl2 (Cu2OCl2+2HCl→2CuCl2+H2O). The dispersing/sintering effect of the different reagents on the active phase has been also investigated.
2002
205
375
381
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WHJ-4576CS9-M&_user=525216&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000026382&_version=1&_urlVersion=0&_userid=525216&md5=9da5fe2eb6a21e9647830aba3ed97021
Al2O3; copper chloride; in situ spectroscopies
G. LEOFANTI; A. MARSELLA; B. CREMASCHI; M. GARILLI; A. ZECCHINA; G. SPOTO; S. BORDIGA; P. FISICARO; C. PRESTIPINO; F. VILLAIN; C. LAMBERTI
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/10857
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