TY - JOUR
T1 - Selective oxidation using Au-Pd catalysts: Role of the support in the stabilization of colloidal Au-Pd NPs
AU - Khawaji, Motaz
AU - Chadwick, David
N1 - KAUST Repository Item: Exported on 2021-07-13
Acknowledgements: Motaz Khawaji gratefully acknowledges the financial support of Saudi Aramco. This work was funded in part by Saudi Aramco and EPSRC (EP/K014749/1). We are grateful to Dr. Ecaterina Ware for her assistance with TEM.
PY - 2020/8/28
Y1 - 2020/8/28
N2 - Bimetallic Au-Pd NPs with a mean particle size of ca. 1.7 nm were prepared by colloidal synthesis with PVA as a stabilizer and immobilized on various ceria and titania nanostructures. The catalysts were characterised by TEM, XRD, XPS, ICP-AES, and their catalytic performance assessed in the solvent-less selective oxidation of benzyl alcohol. It is shown that even with a technique such as sol-immobilization, the final particle size is sensitive to the physiochemical properties and morphology of the support. In particular, ceria nanostructures were found to be more effective at stabilizing colloidal Au-Pd NPs than titania. Among the ceria nanostructured supports investigated, Au-Pd/ceria nanorods exhibited the highest catalytic activity (TOF > 34,700 h−1) and highest benzaldehyde yield. The particle size of the supported Au-Pd was found to be correlated with the surface area and concentration of Ce3+ and oxygen vacancies in the ceria nanostructures. Overall, the catalytic activity of supported bimetallic Au-Pd catalysts is likely to be governed by a complex interplay of contributions from the particle size, and support morphology, structure and properties.
AB - Bimetallic Au-Pd NPs with a mean particle size of ca. 1.7 nm were prepared by colloidal synthesis with PVA as a stabilizer and immobilized on various ceria and titania nanostructures. The catalysts were characterised by TEM, XRD, XPS, ICP-AES, and their catalytic performance assessed in the solvent-less selective oxidation of benzyl alcohol. It is shown that even with a technique such as sol-immobilization, the final particle size is sensitive to the physiochemical properties and morphology of the support. In particular, ceria nanostructures were found to be more effective at stabilizing colloidal Au-Pd NPs than titania. Among the ceria nanostructured supports investigated, Au-Pd/ceria nanorods exhibited the highest catalytic activity (TOF > 34,700 h−1) and highest benzaldehyde yield. The particle size of the supported Au-Pd was found to be correlated with the surface area and concentration of Ce3+ and oxygen vacancies in the ceria nanostructures. Overall, the catalytic activity of supported bimetallic Au-Pd catalysts is likely to be governed by a complex interplay of contributions from the particle size, and support morphology, structure and properties.
UR - http://hdl.handle.net/10754/670132
UR - https://linkinghub.elsevier.com/retrieve/pii/S0920586119304699
UR - http://www.scopus.com/inward/record.url?scp=85072179001&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2019.08.036
DO - 10.1016/j.cattod.2019.08.036
M3 - Article
SN - 1873-4308
VL - 348
SP - 203
EP - 211
JO - CATALYSIS TODAY
JF - CATALYSIS TODAY
ER -