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Issue 3, 2013
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Effect of acid pre-treatment on AuPd/SiO2 catalysts for the direct synthesis of hydrogen peroxide

Jennifer K. Edwards,*a  Stewart F. Parker,b  James Pritchard,a  Marco Piccinini,a  Simon J. Freakley,a  Qian He,c  Albert F. Carley,a  Christopher J. Kielyc  and  Graham J. Hutchings*a 
Author affiliations

* Corresponding authors

a Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, UK
E-mail: hutch@cf.ac.uk, edwardsjk@cf.ac.uk

b ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, UK

c Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, USA

Abstract

The direct synthesis of hydrogen peroxide is investigated using silica supported Au, Pd and AuPd catalysts. Acid pre-treatment of the silica leads to an increase in the activity of the Pd-containing catalysts and also gives rise to a synergistic enhancement in activity when Au and Pd are combined that is absent in the untreated catalysts. The acid pre-treated mono and bi metallic catalysts show much reduced H2O2 hydrogenation activity compared to their untreated counterparts. The acid pre-treatment increases the concentration of the hydroxyl groups on the support, as demonstrated using inelastic neutron scattering, which helps to disperse the metals on the support. Pd can be dispersed effectively on silica, but Au is very poorly dispersed although this is enhanced marginally by the acid pre-treatment. The origin of the synergistic effect is discussed and is considered to be related to the incorporation of a small amount of Au within the Pd nanoparticles.

Graphical abstract: Effect of acid pre-treatment on AuPd/SiO2 catalysts for the direct synthesis of hydrogen peroxide

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Publication details

The article was received on 08 Nov 2012, accepted on 30 Nov 2012 and first published on 04 Dec 2012


Article type: Paper
DOI: 10.1039/C2CY20767B
Citation: Catal. Sci. Technol., 2013,3, 812-818
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    Effect of acid pre-treatment on AuPd/SiO2 catalysts for the direct synthesis of hydrogen peroxide

    J. K. Edwards, S. F. Parker, J. Pritchard, M. Piccinini, S. J. Freakley, Q. He, A. F. Carley, C. J. Kiely and G. J. Hutchings, Catal. Sci. Technol., 2013, 3, 812
    DOI: 10.1039/C2CY20767B

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