1

Supplementary Data

Effect of acid pre-treatment on AuPd/SiO2 catalysts for the direct synthesis of

hydrogen peroxide

Jennifer K. Edwards,1*

Stewart F. Parker,2 James Pritchard,

1 Marco Piccinini,

1 Simon J. Freakley,

1

Qian He,3 Albert F. Carley,

1 , Christopher J. Kiely

3 and Graham J. Hutchings

1*

1Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place,

Cardiff, CF10 3AT, UK

2ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK ADD

3Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue,

Bethlehem, PA 18015-3195, USA

Electronic Supplementary Material (ESI) for Catalysis Science & TechnologyThis journal is © The Royal Society of Chemistry 2013

2

20.4

20.6

20.8

21.0

21.2

21.4

21.6

0 50 100 150 200 250 300 350

Sample Temperature (oC)

Sa

mp

le M

as

s (

mg

)

Supplementary Figure 1. Thermogravimetic analysis profile for the untreated SiO2 support.

18.8

19.0

19.2

19.4

19.6

19.8

20.0

0 50 100 150 200 250 300 350

Sample Temperature (oC)

Sa

mp

le M

as

s (

mg

)

Supplementary Figure 2. Thermogravimetic analysis profile for 2% HNO3 pre-treated SiO2

support.

Electronic Supplementary Material (ESI) for Catalysis Science & TechnologyThis journal is © The Royal Society of Chemistry 2013

3

Catalyst

SiO2 source

SiO2 Pre-treatment

Untreated

(molH2O2 kgcat-1

hr -1

)

2% HNO3

(molH2O2 kgcat-1

hr -1

)

2.5%Au /SiO2 Johnson Matthey 0.4 1

2.5%Au-2.5%Pd/SiO2 Johnson Matthey 40 140

2.5%Pd/SiO2 Johnson Matthey 56 68

2.5%Au /SiO2 Grace 1 1.5

2.5%Au-2.5%Pd/SiO2 Grace 108 185

2.5%Pd/SiO2 Grace 80 108

2.5%Au /SiO2 Degussa 4 4.2

2.5%Au-2.5%Pd/SiO2 Degussa 135 200

2.5%Pd/SiO2 Degussa 130 155

Supplementary Table 1 Au, Pd and AuPd catalysts supported on differnt SiO2 and acid pre-treated

SiO2 supports

Electronic Supplementary Material (ESI) for Catalysis Science & TechnologyThis journal is © The Royal Society of Chemistry 2013