INVESTIGADORES
YORI Juan Carlos
artículos
Título:
Kinetic study of the partial hydrogenation of 1-heptyne on tungsten oxide supported on alumina
Autor/es:
MARÍA J. MACCARRONE; GERARDO C. TORRES; CECILIA R. LEDHEROS; JUAN M. BADANO; CARLOS R. VERA; MÓNICA E. QUIROGA; JUAN C. YORI
Revista:
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Editorial:
JOHN WILEY & SONS LTD
Referencias:
Lugar: Londres; Año: 2012 vol. 87 p. 1521 - 1528
ISSN:
0268-2575
Resumen:
BACKGROUND: Partial hydrogenation of alkynes have industrial and academic relevance on a large scale; industries such as
petrochemical, pharmacology and agrochemical use these compounds as raw material. Typical commercial catalysts contains
palladium. Finding an economic, active and selective catalyst for the production of alkenes via partial hydrogenation of alkynes
is thus an important challenge. On the other hand, the literature on kinetic studies of partial hydrogenation of heavy alkynes
is scarce. So the main objectives of this work were to prepare a cheaper catalyst based on lowWloading, and study the kinetic
of the partial hydrogenation of 1-heptyne. A pseudo-homogeneous and six heterogeneous kinetic models were analyzed. The
catalyst was characterized by ICP, XPS, DRX, TPR and hydrogen chemisorption techniques.
RESULTS: The characterization results indicate that only WOx species are present on the alumina surface. The WOx/Al2O3x species are present on the alumina surface. The WOx/Al2O3
catalyst was active and selective for producing 1-heptene even at low reaction temperatures, the partial hydrogenation of
1-heptyne proceeds via two irreversible reactions in parallel.
CONCLUSION:The best fit of the experimentaldatawasachievedwithaheterogeneousLangmuir-Hinshelwood-Hougen-Watson
model in which the rate controlling step is the dissociative adsorption of hydrogen. The activation energy was estimated as
EH2 =34.8 kJ mol−1H2 =34.8 kJ mol−1