New composite materials as support for selective hydrogenation; egg-shell catalysts

Published Date
20 December 2010, Vol.390(1):166–174, doi:10.1016/j.apcata.2010.10.008

Author 

J.M. Badano ^a,,

C. Betti ^a

I. Rintoul ^b,c

J. Vich-Berlanga ^c

E. Cagnola ^b

G. Torres ^b

C. Vera^a,b

J. Yori ^a,b

M. Quiroga ^a,b

aINCAPE-CONICET, Instituto de Investigaciones en Catálisis y Petroquímica, Santiago del Estero 2654, S3000AOJ Santa Fe, Argentina

• bFacultad de Ingeniería Química (UNL), Santiago del Estero 2829, S3000AOJ Santa Fe, Argentina
• cINTEC-CONICET, Instituto para el desarrollo de la Industria Química, Ruta Nac. 168 El Pozo, 3000 Santa Fe, Argentina

Received 19 July 2010. Revised 4 October 2010. Accepted 6 October 2010. Available online 14 October 2010.


Abstract

It has been demonstrated that using low-cost materials and a relatively simple process, complex supports with a mixed inorganic–organic structure can be synthesized. These supports combine hydrophilic–hydrophobic dual properties and are especially suited for preparing egg-shell supported metal catalysts to be used in highly exothermal catalytic reactions or in systems of consecutive reactions where diffusive problems decrease the selectivity. The synthesized supports have an extremely thin active layer. They also proved to be more mechanically resistant than other commercial supports thus being amenable for use in continuous processes with long packed beds. Pd catalysts supported over the new composite materials were found to be highly active for the selective hydrogenation of styrene, a representative compound of pyrolisis gasolines. They also displayed smaller diffusive constraints than other Pd catalysts prepared from commercial supports.

Graphical abstract

Graphical description of the procedure impregnation of the new composite supports to obtain Pd egg-shell catalyst.

Research highlights

▶ New Composites Supports were developed to obtain egg-shell catalysts. ▶ Composites Supports combine hydrophilic-hydrophobic dual properties. ▶ Composite Supports have higher mechanical resistance than commercial supports. ▶ Synthesized egg-shell catalysts with Composites Supports have a thin active layer. ▶ Pd-Composite are more active than Pd-commercial in pelletized supports form.

Keywords

• Heterogeneous catalysis
• Palladium
• Egg-shell catalysts
• Composite materials

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