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Kinetics of iodine poisoning of hydrophobic Pt/SDBC catalyst for hydrogen isotopic exchange reaction
Author(s) -
Wei YueZhou,
Shimizu Masami,
Takeshita Kenji,
Kumagai Mikio,
Takashima Yoichi
Publication year - 1997
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450750303
Subject(s) - catalysis , chemistry , adsorption , iodine , styrene , inorganic chemistry , reaction rate , kinetics , chemical kinetics , hydrogen , redox , organic chemistry , copolymer , physics , quantum mechanics , polymer
Changes with time in the isotopic exchange reaction rate between H 2 and HDO ( v ) over a hydrophobic Pt/SDBC (styrene‐divinylbenzene copolymer) catalyst induced by iodine have been studied experimentally. The addition of a trace amount of I 2 to the reactor caused a remarkable decrease in the activity of the catalyst. The measurement results by means of the gas chromatographic pulse technique show that the H 2 adsorption onto the catalyst surface was strongly inhibited by iodine. A kinetic model for the poisoning was developed in terms of the competitive adsorption of I 2 with H 2 onto the catalytic active site. The experimental results were explained reasonably by the proposed kinetic model based on the site balance by assuming that I 2 adsorbs non‐dissociatively on the active site. The poisoning could be prevented by the conversion of I 2 to I − or IO 3 − through redox reactions.