Catalizadores de cobre soportado parareducción selectiva de glicerol

AUTOR(ES)
FONTE

Matéria (Rio J.)

DATA DE PUBLICAÇÃO

2015-09

RESUMO

ABSTRACTThe biodiesel industry has brought with it an oversupply of glycerol, which is the byproduct of the process, generating a fall in its price. The transformation of glycerol into value-added compounds interest as it would improve the overall economic balance of biofuel production enabling environmentally sustainable development by using renewable raw material. In Argentina, the province of Santa Fe has an installed capacity of 2.5 million TM/year of biodiesel, with consequent 250,000 TM/year of glycerol, so the topic is of great interest to the regional socio-productive means. One route to valorize glycerol is the catalytic hydrogenolysis reaction, better called selective reduction, to obtain propanediols. Metal supported catalysts were reported as assets to drive the liquid phase hydrogenolysis, finding little information for the gas phase reaction. For this reason, Metal/Support type catalysts were prepared by impregnation following the incipient wetness technique, being evaluated in liquid phase in a system with a stainless steel reactor and semi-continuous operation and in gas phase in a continuous system with a fixed bed down-flow reactor. The reaction was followed by gas chromatography, being on line to the non-condensed phase. The range of operating conditions evaluated was 170-240°C and 1-30 kg cm-2 pressures. For liquid phase, activity and selectivity to 1,2-propanediol were similar to those previously reported, improving conversion by increasing temperature and pressure. For gas phase, conversion and selectivity were strongly influenced by reaction conditions, being acetol the main co-product, which is indicated as the reaction intermediate. Materials displaying better behavior were characterized by TPR, XRD, and FTIR to determine their characteristics, relating catalytic activity, and optimizing preparation.

Documentos Relacionados