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Pd‐Ag/ α ‐Al 2 O 3 Catalyst Deactivation in Acetylene Selective Hydrogenation Process
Author(s) -
Ravanchi Maryam Takht,
Sahebdelfar Saeed,
Fard Maryam Rahimi,
Fadaeerayeni Siavash,
Bigdeli Peyman
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201400526
Subject(s) - acetylene , catalysis , coke , ethylene , chemistry , hydrogen , reaction rate constant , catalyst poisoning , order of reaction , kinetics , inorganic chemistry , catalyst support , organic chemistry , physics , quantum mechanics
The selective hydrogenation of acetylene to ethylene over Pd‐Ag/ α ‐Al 2 O 3 catalysts prepared by different impregnation/reduction methods was studied. The best catalytic performance was achieved with the sample prepared by sequential impregnation. A kinetic model based on first order in acetylene and 0.5th order in hydrogen for the main reaction and second‐order independent decay law for catalyst deactivation was used to fit the conversion time data and to obtain quantitative assessment of catalyst performances. Fair fits were observed from which the reaction and deactivation rate constants were evaluated. Coke deposition amounts showed a good correlation with catalyst deactivation rate constants, indicating that coke formation should be the main cause of catalyst deactivation.