The development of greener and more economical routes for chemicals production is one of the major current concerns at industrial level. This is particularly true in the fine chemicals sector, where the large amount of waste produced contribute to the characteristic high E-factor (Kg waste/Kg product). Catalysis may be the key to solve the problem provided that active and selective catalysts are elaborated. These are the distinctive features of homogeneous phase catalysts, which indeed dominate the sector. However, they show severe drawbacks in terms of recovery and reuse of the precious catalysts. The immobilization of chemical catalysts onto solid insoluble supports offers significant benefits to this regard. The present Thesis reports a simple one-pot strategy for the synthesis of solid-supported metal catalysts based on ion-exchange resins, and in-situ formed metal nanoparticles under mild catalytic hydrogenation conditions (room temperature, 1 bar H2). The so-formed heterogeneous palladium system was carefully characterized and tested in hydrogenations processes for the synthesis of high added value chemicals. The catalyst showed high activity and selectivity and could be readily reused several times with neither detectable metal leaching in solution nor significant efficiency decay under batch conditions. Application to the synthesis of the leaf alcohol cis-3-hexen-1-ol was explored both under batch and continuous mode showing significant advantages compared to established industrial process.
Polymer Supported Metal Nanoparticles for the Green Synthesis of Fine Chemicals / Maria Carmen Moreno Marrodan. - STAMPA. - (2012).
Polymer Supported Metal Nanoparticles for the Green Synthesis of Fine Chemicals
MORENO MARRODAN, MARIA CARMEN
2012
Abstract
The development of greener and more economical routes for chemicals production is one of the major current concerns at industrial level. This is particularly true in the fine chemicals sector, where the large amount of waste produced contribute to the characteristic high E-factor (Kg waste/Kg product). Catalysis may be the key to solve the problem provided that active and selective catalysts are elaborated. These are the distinctive features of homogeneous phase catalysts, which indeed dominate the sector. However, they show severe drawbacks in terms of recovery and reuse of the precious catalysts. The immobilization of chemical catalysts onto solid insoluble supports offers significant benefits to this regard. The present Thesis reports a simple one-pot strategy for the synthesis of solid-supported metal catalysts based on ion-exchange resins, and in-situ formed metal nanoparticles under mild catalytic hydrogenation conditions (room temperature, 1 bar H2). The so-formed heterogeneous palladium system was carefully characterized and tested in hydrogenations processes for the synthesis of high added value chemicals. The catalyst showed high activity and selectivity and could be readily reused several times with neither detectable metal leaching in solution nor significant efficiency decay under batch conditions. Application to the synthesis of the leaf alcohol cis-3-hexen-1-ol was explored both under batch and continuous mode showing significant advantages compared to established industrial process.File | Dimensione | Formato | |
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PhD Thesis Carmen Moreno.pdf
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