Producción CyT
Artículo
Autoría
BETTI, CAROLINA PAOLA
;
Torres, Gerardo Carlos
;
MACCARRONE, MARIA JULIANA
;
LEDERHOS, CECILIA ROSA
;
Quiroga, Monica Esther
;
Yori, Juan Carlos
;
VERA, CARLOS ROMAN
Fecha
2019
Editorial y Lugar de Edición
Springer
Revista
Reaction Kinetics, Mechanims and Catalysis,
vol. 127
(pp. 259-281)
- ISSN 1878-5190
Springer
Springer
ISSN
1878-5190
Resumen
Información suministrada por el agente en
SIGEVA
Low loaded W-Pd/Alumina are relatively novel catalysts for performing the selective hydrogenation of alkynes, but there is scarce information on the working mechanism. This work studies the kinetics of the selective hydrogenation of 3-hexyne to (Z)-3-hexene over a low loaded W-Pd/Alumina catalyst. Runs at different mild reaction conditions were used for fitting a set of Langmuir-Hinshelwood models. Semihydrogenation was the prevailing reaction path, leading selectively to (Z)-3-hexene > 95%,...
Low loaded W-Pd/Alumina are relatively novel catalysts for performing the selective hydrogenation of alkynes, but there is scarce information on the working mechanism. This work studies the kinetics of the selective hydrogenation of 3-hexyne to (Z)-3-hexene over a low loaded W-Pd/Alumina catalyst. Runs at different mild reaction conditions were used for fitting a set of Langmuir-Hinshelwood models. Semihydrogenation was the prevailing reaction path, leading selectively to (Z)-3-hexene > 95%, as with classical Lindlar catalysts. Smaller amounts of (E)-3-hexene and negligible of n-hexane were detected. When considering a pseudo-homogeneous model, approximate orders in 3-hexyne and hydrogen were (2.5) and (-2.2), respectively. The latter value pointed to an important role of hydrogen chemisorption. Twelve kinetic models were fitted to the experimental data. A normal dissociative adsorption of hydrogen could not account for the high order in hydrogen, hence the adsorption of non-dissociated molecular hydrogen was also taken into account. Best fit model was the one considering adsorption of 3-hexyne as rate-limiting step, with molecular hydrogen acting as a competitor over Pdn+ sites, and with hydrogen being dissociated over other different sites: Pdd?.
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Palabras Clave
BIMETALLIC CATALYSTTUNGSTENKINETICSSELECTIVE HYDROGENATIONALKYNEPALLADIUM
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