Premium
Regulation of the chlorine content in fresh, regenerated and coked PtRe/Al 2 O 3 catalyst
Author(s) -
Scelza Osvaldo A.,
Baronetti Graciela T.,
de Miguel Sergio R.,
Silber Pablo,
Castro Alberto A.
Publication year - 1993
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280580206
Subject(s) - chlorine , naphtha , coke , catalysis , chemistry , molar ratio , bifunctional , chemical engineering , inorganic chemistry , organic chemistry , engineering
In bifunctional naphtha reforming catalysts the regulation of the chlorine content in order to equilibrate both catalytic functions (metallic and acidic) is one of the most relevant topics. In this paper a study of the chlorine regulation in fresh, regenerated and coked samples of a given commercial Pt (0.3 wt%)—Re (0.3 wt%)/Al 2 O 3 catalyst is presented. Results show that an equilibrium chlorine content is reached when the samples are treated with an H 2 O—HCl mixture vaporized in a gas carrier (air or H 2 ). This equilibrium content depends on the H 2 O/HCl molar ratio and the temperature of the regulation treatment. For fresh samples the equilibrium chlorine content does not depend on the nature of the gas carrier. Moreover, the retention capacity of chlorine by the support per unit of surface area is the same for fresh and regenerated samples. The presence of different amounts of coke on the surface does not modify the chlorine uptake with respect to the sample without coke.