test
Search publications, data, projects and authors

Thesis

Spanish

ID: <

http://hdl.handle.net/10251/90466

>

·

DOI: <

10.4995/thesis/10251/90466

>

Where these data come from
VALORACIÓN DE MOLÉCULAS PLATAFORMA DERIVADAS DE BIOMASA MEDIANTE AMINACIÓN REDUCTIVA UTILIZANDO NANOPARTÍCULAS METÁLICAS COMO CATALIZADORES HETEROGÉNEOS

Abstract

In this Doctoral Thesis we present the valorization of raw materials derived from biomass, specifically ethyl levulinate and 5-hydroxymethylfurfural, by reductive amination with primary amines, using heterogeneous catalysts based on supported metallic nanoparticles and hydrogen as reducing agent. For this, multifunctional heterogeneous catalysts based on nanoparticles of different metals (Pt, Pd and Ru) supported on different materials have been prepared and characterized. The most important results collected in this work can be divided into three parts: A) Synthesis of 2-pyrrolidones by reductive amination of ethyl levulinate with different amines, using hydrogen as a reducing agent and in the absence of solvent. The process presents a first step in which the formation of an intermediate imine takes place, followed by the hydrogenation of the C=N double bond and cyclization to 2-pyrrolidones. The results showed that the catalyst 0.2%Pt/TiO2 (dec), in which the Pt nanoparticles are decorated with TiOx species from the support, is a very active and chemoselective catalyst to carry out this process, being possible to achieve excellent results In terms of conversions and selectivities to the corresponding pyrrolidones, even in the presence of groups capable of being hydrogenated. B) Synthesis of pyrrolidones by reductive amination of ethyl levulinate and different nitro compounds through a cascade process through reductive amination. A catalyst was developed based on Pt nanoparticles supported on titanium dioxide nanotubes (0.2%Pt/TiO2-NT (dec)) capable of catalyzing the hydrogenation of the nitro group and RA with high chemoselectivity. In addition, through in situ infrared studies, kinetic and mechanistic aspects of the course of the reaction were studied to determine which were the active centers that act in the process. C) Synthesis of N-substituted 5-hydroxymethyl-2-furfurylamines derivatives by reductive amination of HMF with different amines. Catalysts based on carbon-supported Pd nanoparticles (5%Pd/CA) were used. In this case, good results were also obtained for obtaining furfurylamines derivatives. Vidal Castro, JD. (2017). VALORACIÓN DE MOLÉCULAS PLATAFORMA DERIVADAS DE BIOMASA MEDIANTE AMINACIÓN REDUCTIVA UTILIZANDO NANOPARTÍCULAS METÁLICAS COMO CATALIZADORES HETEROGÉNEOS [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/90466 TESIS

Your Feedback

Please give us your feedback and help us make GoTriple better.
Fill in our satisfaction questionnaire and tell us what you like about GoTriple!