Effect of the preparation of the catalyst and the protective agent in liquid phase hydrogenation reactions

Authors: Shahram Alijani (Universita Degli Studi Di Milano)
Co-authored by industrial partner: No

Type: Thesis

State: Published (Approved)
Published: March 2021

Abstract: In this Ph.D. project, the effective parameters in the sol-immobilization method which can affect catalytic reactivity including: capping agent, solvent of synthesis, and support were studied. The synthesized catalysts were employed in the liquid phase hydrogenation reactions of two biomass derived molecules namely furfural and vanillin. In this regard, the role of protective agents, which are used to stabilize colloidal nanoparticles (NPs) in solutions, for Pd NPs supported on carbon support in the liquid phase hydrogenation of furfural was explored. The use of Pd as a hydrogenation catalyst is well documented, as hydrogenation reactions can only be performed by metals that can easily chemisorb hydrogen. Pd is one of such metals capable of dissociate hydrogen even at room temperature. The capping agent adsorbed on the surface of the NPs can alter their activity and selectivity, by modifying the particle size, size distribution, morphology, and stability against leaching and agglomeration. Besides, the effect of the amount of protective agent and the synthesis solvents have been investigated, allowing better insight into the metal-support interaction in Pd/TiO2 catalysts for the hydrogenation of furfural. Then, the effect of using different carbonaceous supports with various chemical- physical properties on the activity and selectivity towards the hydrodeoxygenation of vanillin as a lignin model compound was explored.

Journal Keywords: urfural; hydrogenation; palladium; nanoparticles; capping agent; sol-immobilization

Subject Areas: Chemistry

Diamond Offline Facilities: Electron Physical Sciences Imaging Centre (ePSIC)
Instruments: B18-Core EXAFS , E01-JEM ARM 200CF

Added On: 08/09/2021 09:06

Discipline Tags:

Catalysis Physical Chemistry Chemistry

Technical Tags:

Microscopy Spectroscopy Electron Microscopy (EM) X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS) X-ray Absorption Near Edge Structure (XANES) Scanning Transmission Electron Microscopy (STEM)