Premium
Glycerol Oxidation Using MgO‐ and Al 2 O 3 ‐supported Gold and Gold–Palladium Nanoparticles Prepared in the Absence of Polymer Stabilizers
Author(s) -
Dodekatos Georgios,
Abis Laura,
Freakley Simon J.,
Tüysüz Harun,
Hutchings Graham J.
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800074
Subject(s) - selectivity , catalysis , polyvinyl alcohol , polymer , glycerol , stabilizer (aeronautics) , palladium , nanoparticle , chemistry , chemical engineering , alcohol oxidation , aqueous solution , materials science , polymer chemistry , inorganic chemistry , organic chemistry , nanotechnology , mechanical engineering , engineering
Au and AuPd nanoparticles supported on MgO and Al 2 O 3 were employed for the selective aqueous phase oxidation of glycerol under basic conditions. Catalysts were prepared by sol‐immobilization without the addition of a stabilizing agent such as polyvinyl alcohol (PVA), which is generally added to stabilize the noble metal sol prior to immobilization. The obtained materials prepared with and without stabilizing agent were active for glycerol oxidation and showed similar catalytic performances—implying that the stabilizing polymer is not required to obtain active materials. Depending on the support used, it was possible to tailor the selectivity towards the desired oxidation products by using catalysts prepared with or without stabilizing agent. PVA‐free Au/γ‐Al 2 O 3 exhibited a remarkably high selectivity towards tartronic acid (40 % at 97 % conversion), which was not observed for Au/γ‐Al 2 O 3 prepared with PVA (27 % at isoconversion). Selective glycerol oxidation performed under base‐free conditions over AuPd/MgO catalysts also corroborated the previous results that the presence of a stabilizing polymer is not required to prepare active catalysts by sol‐immobilization. Thus, a facile way to circumvent the inherent drawbacks encountered by the use of polymer stabilizers during catalyst preparation is presented herein. Experimental results suggest that the presence of the polymer stabilizers can affect the reaction pathways and control selectivity.