Plant-mediated synthesis of Au–Pd alloy nanoparticles supported on MnO₂nanostructures and their application toward oxidation of 5-(hydroxymethyl)furfural

Abstract

The bio-reduction of Au(iii) and Pd(ii) was first applied to the loading process. Au–Pd/MnO2was first applied in oxidation of HMF. The effects of Au–Pd molar ratio and the support morphology on the catalysis were discussed.

Metal Catalysts for the Efficient Transformation of Biomass‐derived HMF and Furfural to Value Added Chemicals

“…Bimetallic catalysts of Au have also been efficiently explored for the oxidative upgradations of furans . Pasini et al.…”

“…In the same direction, studies showed that Pt catalysts supported on activated carbon functionalized with oxygen containing functional groups such as carboxyl group also displayed higher activity towards the oxidation of HMF to FDCA . Similarly, bimetallic Au‐Pd nanoparticles supported on MnO 2 (Au‐Pd/MnO 2 ) exhibited higher catalytic activity towards the selective oxidation of HMF to DFF as compare to the monometallic catalyst and achieved upto 98 % selectivity at 90 °C under O 2 atmosphere in 6 h …”

Catalytic Aerial Oxidation of Biomass‐Derived Furans to Furan Carboxylic Acids in Water over Bimetallic Nickel–Palladium Alloy Nanoparticles

“…Au‐nanoparticles‐based catalysts have been widely used in oxidation reactions because of their high affinity towards oxygen . Therefore, several groups have explored monometallic Au and bimetallic Au–Cu and Au–Pd catalysts for the selective oxidation of 5‐HMF to FDCA . As the Au catalysts showed some deactivation in the presence of carboxylate products, most of these reactions were performed under the high pressure (20 bar) of O 2 gas and in several cases with strong base, NaOH, to achieve high selectivity to FDCA .…”

“…[38,39] Therefore, several groups have explored monometallic Au and bimetallic Au-Cu and Au-Pd catalysts for the selectiveo xidation of 5-HMF to FDCA. [40][41][42][43][44][45][46][47] As the Au catalysts showeds omed eactivation in the presenceo fc arboxylate products,m ost of these reactions were performed under the high pressure (20 bar) of O 2 gas and in several cases with strongb ase, NaOH, to achieve high selectivity to FDCA. [39][40][41][42][43][44][45][46][47] Other than Au catalysts, Pt-, Ru-and Pd-based catalysts were Bimetallic Ni 1Àx Pd x (0.10 x 0.75) alloy nanoparticle catalysts were synthesised and successfully employed for the catalytic aerial oxidationo fb iomass-derived furans, such as 2-furfuraldehyde (furfural), 2-furfuryla lcohol (furfuryla lcohol), 5-hydroxymethyl-2-furfural (5-HMF), 5-methyl-2-furfural (MF) and 5methyl-2-furfuryl alcohol (MFA), to selectively afford the corresponding furan carboxylic acids (2-furoic acid, furan-2,5-dicarboxylic acid (FDCA)a nd 5-methyl-2-furoic acid (MFCA)) in water at 80 8C.…”

“…[40][41][42][43][44][45][46][47] As the Au catalysts showeds omed eactivation in the presenceo fc arboxylate products,m ost of these reactions were performed under the high pressure (20 bar) of O 2 gas and in several cases with strongb ase, NaOH, to achieve high selectivity to FDCA. [39][40][41][42][43][44][45][46][47] Other than Au catalysts, Pt-, Ru-and Pd-based catalysts were Bimetallic Ni 1Àx Pd x (0.10 x 0.75) alloy nanoparticle catalysts were synthesised and successfully employed for the catalytic aerial oxidationo fb iomass-derived furans, such as 2-furfuraldehyde (furfural), 2-furfuryla lcohol (furfuryla lcohol), 5-hydroxymethyl-2-furfural (5-HMF), 5-methyl-2-furfural (MF) and 5methyl-2-furfuryl alcohol (MFA), to selectively afford the corresponding furan carboxylic acids (2-furoic acid, furan-2,5-dicarboxylic acid (FDCA)a nd 5-methyl-2-furoic acid (MFCA)) in water at 80 8C. Amongt he studied Ni 1Àx Pd x nanoparticle catalysts, Ni 0.90 Pd 0.10 nanoparticle catalyst outperformed the others, achieving high yields of the corresponding furan carboxylic acid products.T he presence of Ni in the Ni 1Àx Pd x nanoparticle catalysts was advantageous, because it not only enhanced the catalytic activityf or the facile oxidation of biomass-derived furans using aerial oxygen to achieve high catalytic turnover, but also providede xcellent stability to the Ni 0.90 Pd 0.10 nanoparticle catalyst towards air and water and thus significantlye nhanced its recyclability (up to 10 catalytic runs).…”