Preparation of SBA-15 supported Pt/Pd bimetallic catalysts using supercritical fluid reactive deposition: how do solvent effects during material synthesis affect catalytic properties?

Abstract

Supercritical carbon dioxide is the preferred reaction medium for catalyst synthesis as exemplified for the hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL).

Green preparation of PtRu and PtCu/SBA-15 catalysts using supercritical CO 2

“…In conclusion, the SCFD technique is a very versatile technique that allows the deposition of PtRu and PtCu bimetallic NPs homogeneously on mesoporous SiO2 SBA-15. In comparison to previous reports on the preparation of Pt bimetallic supported NPs using scCO2, particles are slightly larger than those previously deposited on carbon based supports [14] and of similar size to the PtPd NPs on SBA-15 [17].…”

“…Supported metal NPs of PtRu, PtPd, PtCu, PtNi and PtAu, have been previously prepared using scCO2. Apart from a very recent report by Qiao et al on the deposition of PtPd NPs on mesoporous SiO2 supports [17], bimetallic Pt NPs were deposited on carbon based supports such as carbon nanotubes (CNTs) [14,18,19], carbon black [14] and, recently, on functionalized graphene sheets [20] for catalytic applications.…”

Coordinating Ability of Anions, Solvents, Amino Acids, and Gases towards Alkaline and Alkaline‐Earth Elements, Transition Metals, and Lanthanides

“…The formation of bimetallic Pt-Pd nanoparticles from organometallicc omplexes in differents olvents was studied by Leitner and co-workers, who attributed the fact that in THF the Pt/Pd ratio is much larger than in n-pentane, toluene or supercritical CO 2 to the possibility of strong solute solvent interactions between the 16-electron Pt precursor and the more coordinating THF. [61] In another example, the synthesis of M 4 Ag 44 (p-MBA) 30 molecular nanoparticles (whereMis an alkali metal and p-MBA is the mercaptobenzoate anion) in aqueouss olution carrying a small amount of ac oordinating agent (acetate, DMSO,D MF, pyridine, water at pH 12 or acetone) gave yields that correspond approximately to their coordinating abilities. [62] Burrows et alc arriedo ut as tudy of crystalline nanoparticle aggregation of goethite (a-FeOOH), anatase( TiO 2 ), and ferrihydrite (Fe 5 HO 8 ·4 H 2 O) in several solvents.…”

xNi–yCu–ZrO2 catalysts for the hydrogenation of levulinic acid to gamma valorlactone

“…High turnover numbers can also be achieved using well dispersed Pd nanoparticles deposited on SiO 2 supports [10]. Ir on polymer supports [11], Sn/ SBA-15 [12] and Pt-Pd/SBA-15 [13] have also been identified as active catalysts for this hydrogenation reaction. However, for a process to become truly sustainable, not only do the substrates need to be renewable but OPEN ACCESS also the catalysts used for their transformation should be inexpensive and abundant in nature.…”