Catalytic Oxidation of Cellobiose over TiO2 Supported Gold-Based. Bimetallic Nanoparticles. Prince Nana Amaniampong, Xinli Jia, Bo Wang, Samir H. Mushrif,.
Electronic Supplementary Material (ESI) for Catalysis Science & Technology. This journal is © The Royal Society of Chemistry 2015
Supporting Information Catalytic Oxidation of Cellobiose over TiO2 Supported Gold-Based Bimetallic Nanoparticles Prince Nana Amaniampong, Xinli Jia, Bo Wang, Samir H. Mushrif, Armando Borgna,Yanhui Yang
The as-synthesized catalysts were characterized by various characterization techniques such as XRD, UV-vis spectra and NH3-TPD analysis. S 1 XRD patterns of bimetallic catalysts studied in this work The XRD patterns of supported bimetallic catalysts are shown in S 1. The patterns exhibit strong diffraction peaks at 2𝜃 = 25° (101) (major), 27.5° (110), 35.1° (101), 48° (200), 54.3° (105) ,55.1° (211), 64.5° (310), 70° (220), 75° (215) and 84.5° (303), suggesting a mixture of rutile and anatase phases of TiO2 supports. The XRD characteristic peaks corresponding to palladium, gold, copper, ruthenium and cobalt were not detected for Pd-Au, Cu-Au, Ru-Au and Co-Au, respectively, because of the low amount of metals loaded, high metal dispersion and probably, the very high intensity of the TiO2 peaks.
R: Rutile A: Anatase
A A AR
R
A
A A
Intensity (a.u)
R
Co-Au/TiO2
A
Cu-Au/TiO2 Pd-Au/TiO2
Ru-Au/TiO2 20
25
30
35
40
45
50
55 60
65
2 Thetha degree
70
75
80
85
90
S 2 UV-vis spectra of the bimetallic catalysts The UV-vis spectra of the bimetallic samples are shown S 2. The absorbance in the visible region was significantly pronounced for the Cu-Au/TiO2 catalyst. The broad absorption peak at around 570 nm can be ascribed to the surface Plasmon resonance of Au nanoparticles.
S 3 NH3-TPD of Cu-Au/TiO2 NH3-TPD characterization was performed to survey the acid strength of the Cu-Au/TiO2 catalyst sample. S 2 represents the strength of acid sites on the TiO2 support.
o
375 C
o
261 C
200
300
400
Temperature oC
500
600
