Synthesis of PtSn nanoparticles on carbon materials by different preparation methods for selective catalytic hydrogenation of citral

Acrolein Hydrogenation Catalyzed by Pt(111): Effect of Carbonaceous Deposits on Kinetics

“…However, this knowledge can guide our thinking when designing new catalysts. For one, the alloying of Pt with a second metal such as Sn can reduce carbonaceous growth; this is a well-established strategy in oil refining processes, , and has also been tested with unsaturated aldehydes, although the rationale offered in that work has been that modification of the electronic properties of Pt may favor specific aldehyde hydrogenation steps (not that it reduces the amount of carbon deposition on the surface, which it does). ,− More recently, it has been suggested that selectivity in many catalytic reactions may be tuned via surface modification with specific organic modifiers. , In our context, this is a way to exert some control over the coverage and nature of the carbonaceous deposits rather than letting those develop organically during the catalysis . These and other strategies can be developed to reduce or direct the formation of strongly adsorbed species on the surface and with that tune reaction selectivity in hydrogenation catalysis.…”

Design of Nickel Supported Hierarchical ZSM-5/USY Zeolite Bifunctional Catalysts for One-Pot Menthol Synthesis via Liquid-Phase Citral Hydrogenation

“…Generally, it has been observed that a high yield of menthol production via citral hydrogenation would possibly be produced with the use of selective, active, and recyclable bifunctional (metal–acid) catalysts with selective properties. Various catalytic-material-supported (metals), such as H-MCM-41, Al-MCM-41, H-Y zeolite, beta zeolite, activated carbon, Zr-zeolites, ionic liquid catalysts, nickel-supported metals [ 9 ], MOF-derived AgCo alloy nanoparticles [ 10 ], Pt/Sn [ 11 ], Ru-HY extrudates [ 12 ], Pt/SiO 2 [ 13 ] nano-composite catalysts [ 14 ], ruthenium nanoparticles [ 15 ], and SiO 2 -Al 2 O 3 , have been applied in citral hydrogenation reactions to obtain a higher yield of menthol [ 16 , 17 ]. Conversely, it has been observed that menthol selectivity would possibly be decreased due to the lack of active and selective catalyst designs that occur because of the formation of undesired/unrestrained hydrogenations, as well as cracking side reactions [ 5 , 6 ].…”