Is selective hydrogenation of molecular oxygen to H₂O₂ affected by strong metal–support interactions on Pd/TiO₂ catalysts? A case study using commercially available TiO₂ - 04/08/16

Doi : 10.1016/j.crci.2016.05.012

Stefano Sterchele ^a,^⁎ , Marco Bortolus ^b, Pierdomenico Biasi ^a,^c,^⁎ , Dan Boström ^d, Jyri-Pekka Mikkola ^a,^c, Tapio Salmi ^a
^a Department of Chemical Engineering, Laboratory of Industrial Chemistry and Reaction Engineering, Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, 20500 Åbo-Turku, Finland
^b Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 8, 35131 Padova, Italy
^c Department of Chemistry, Chemical-Biochemical Centre (KBC), Technical Chemistry, Umeå University, 90187 Umeå, Sweden
^d Department of Applied Physics and Electronics, Chemical-Biochemical Centre (KBC), Umeå University, 90187 Umeå, Sweden

^∗Corresponding author.^∗∗Corresponding author.

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Abstract

In this study, titania-supported Pd catalysts were prepared and their performance evaluated upon H₂O₂ direct synthesis. Typically, the materials contained different ratios of anatase and rutile phases, which gave rise to different surface properties of the supports, e.g., surface area, number of Lewis acidic and basic sites as well as different compositions of the phases, i.e. the amount of anatase phase and crystallite size. Two materials, Pd-A98 and Pd-A05 samples, respectively, apparently hint the existence of the so-called SMSI (strong metal–support interaction) phenomenon giving rise to 1080 and 683 mol_H2O2·mol_Pd⁻¹·h⁻¹ of H₂O₂ productivity and 22 and 14% of H₂O₂ selectivity, respectively. However, the best material, Pd-A82, gave rise to 949 mol_H₂_O₂·mol_Pd⁻¹·h⁻¹ of H₂O₂ productivity and 26% of H₂O₂ selectivity.

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Keywords : Palladium, Direct synthesis of hydrogen peroxide, Titanium dioxide, Anatase, SMSI (strong metal–support interaction)

Plan

Introduction

Experimental section

Materials

Characterization techniques

Preparation of 1 wt. % Pd/TiO₂

Batch experiments

Results and discussion

Characterization of the supports

Preparation and characterization of the catalysts

Catalytic tests

Conclusions

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Vol 19 - N° 8

P. 1011-1020 - août 2016 Retour au numéro

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Is selective hydrogenation of molecular oxygen to H₂O₂ affected by strong metal–support interactions on Pd/TiO₂ catalysts? A case study using commercially available TiO₂ - 04/08/16

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