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Hydrogenolysis of glycerol to diols catalyzed by transition metals supported on pillared clays

Author(s):
Cristiane Imenes de Campos Bueno Zanin
Total Authors: 1
Document type: Master's Dissertation
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Química
Defense date:
Examining board members:
Dalmo Mandelli; Flávia Camargo Alves Figueiredo
Advisor: Elizabete Jordão
Abstract

The use of glycerol has become a subject of great importance, since it is a byproduct of the synthesis of biodiesel. Besides economic and political factors, from the 1990s, due to environmental problems caused by burning fossil fuels, biodiesel has been become an alternative, making the production of glycerol increases more, thereby lowering its price. However, it is of great important its transformation into products with higher added value such as diols, with interest focused on the petrochemical industry. In order to expand the production of biodiesel, it becomes necessary to develop a "new chemistry of glycerol?, and the hydrogenolysis to dialcohols is promising. The present work aims to study the influence of substrate concentration, amount of catalyst, H2 pressure and temperature on initial velocity of reactions, as well as selectivity and total conversion of substrate, using catalysts based on Pt, Pd and Ru supported on pillared clay (A?-PILC). The catalysts were prepared by impregnation with aqueous suspensions, from the precursor Pt (NH3)4Cl2.0, 68H2O, PdCl2 and RuCl3.1, 37H2O, respectively, to obtain a catalyst with nominal content of 2% ww. The catalysts were characterized by the methods: specific surface area (B.E.T.), temperature programmed reduction (TPR), X-ray diffraction (DRX), infrared spectroscopy (FTIR) of adsorbed pyridine and the pyridine desorption temperature. The performance of the catalysts was evaluated in the reaction of hydrogenolysis of glycerol in the liquid phase, using a high pressure Parr reactor. The results indicate that the use of bifunctional metal-acid catalysts is a way to make the hydrogenolysis more effective, because it favors the dehydration and hydrogenation reactions to produce 1,2-propanediol (AU)

FAPESP's process: 08/02459-2 - Glycerol hydrogenolisis Catalyzed by Pt, Pd and Ru supported in Pillared Clays
Grantee:Cristiane Imenes de Campos Bueno Zanin
Support type: Scholarships in Brazil - Master