Selective hydrogenation by novel composite supported Pd egg-shell catalysts

Carrara, Nicolás; Badano, Juan; Betti, Carolina; Lederhos, Cecilia; Rintoul, Ignacio; Coloma, Fernando; Vera, Carlos Román; Quiroga, Mónica

doi:10.1016/j.catcom.2014.12.012

Cited by 13 publications

(14 citation statements)

References 17 publications

(21 reference statements)

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“…The values at 353 and 373 K for the hydrogenation of styrene were calculated as K eq =3.38x10 11 and K eq =3.57x10 10 , respectively. With these K eq values the reaction of styrene hydrogenation is practically irreversible.…”

Section: Mathematical Calculationsmentioning

confidence: 99%

“…Taking H as approximately constant, equation (11) can be rewritten in terms of hydrocarbon reactant concentrations and hydrogen pressure (eq. (16)) with the help of eqs.…”

Section: Mathematical Calculationsmentioning

confidence: 99%

“…The catalysts used for this work were the same as those used in our previous contribution [11] and share the same characterization results. For this reason only the most relevant data necessary for interpreting the kinetic results will be repeated here.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…Pyrolysis gasoline (PYGAS) is normally produced in ethylene plants processing butane, naphtha or gasoil. PYGAS is a product in the naphtha boiling range, with carbon numbers between C 5 -C 11 , with a high content of aromatics and olefins. It is used for blending with gasoline or as a raw material for the extraction of benzene, toluene and xylene (BTX) [3].…”

Section: Introductionmentioning

confidence: 99%

“…These catalysts were also found to be more mechanically resistant than other commercial supports thus being attractive for being used in long packed bed columns of continuous processes [10]. Finally they have been also found to permit an easy preparation of supported metal egg-shell catalysts with very thin surface metal layers [10,11]. Despite their practical usefulness there are scarce reports on the use of these composite supports [12].…”

Section: Introductionmentioning

confidence: 99%

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Kinetic study of the selective hydrogenation of styrene over a Pd egg-shell composite catalyst

Betti

Badano

Lederhos

et al. 2015

Reac Kinet Mech Cat

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This is a study on the kinetics of the liquid-phase hydrogenation of styrene to ethylbenzene over a catalyst of palladium supported on an inorganic-organic composite. This support has a better mechanical resistance than other commercial supports, e.g. alumina, and yields catalysts with egg-shell structure and a very thin active Pd layer. Catalytic tests were carried out in a batch reactor by varying temperature, total pressure and styrene initial concentration between 353-393 K, 10-30 bar, and 0.26-0.60 mol L -1 , respectively. Kinetic models were developed on the assumptions of dissociative hydrogen chemisorption and non-negligible adsorption of hydrogen and styrene. Final chemical reaction expressions useful for reactor design were obtained. The models that best fitted the experimental data were those ones that considered the surface reaction as the limiting step. In this sense a two-step Horiuti-Polanyi working mechanism with half hydrogenation intermediates gave the best fit of the experimental data. The heats of adsorption of styrene and ethylbenzene were also estimated.

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Section: Mathematical Calculationsmentioning

confidence: 99%

“…Taking H as approximately constant, equation (11) can be rewritten in terms of hydrocarbon reactant concentrations and hydrogen pressure (eq. (16)) with the help of eqs.…”

Section: Mathematical Calculationsmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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