Avaliação de catalisadores a base de carbeto e nitreto de molibdênio na obtenção de lactitol via hidrogenação da lactose / Avaliação de catalisadores a base de carbeto e nitreto de molibdênio na obtenção de lactitol via hidrogenação da lactose

AUTOR(ES)

Janine Reginaldo Guimarães Vieira

DATA DE PUBLICAÇÃO

2010

RESUMO

Seeking a greater appreciation of cheese whey was developed to process the hydrogenation of lactose for the production of lactitol, a polyol with high added value, using the catalyst Ni / activated carbon (15% and 20% nickel), the nitride Mo2N, the bimetallic carbide Ni-Mo/ activated carbon and carbide Mo2C. After synthesis, the prepared catalysts were analyzed by MEV, XRD, laser granulometry and B.E.T. The reactor used in catalytic hydrogenation of lactose was the type of bed mud with a pressure (68 atm), temperature (120 oC) and stirring speed (500 rpm) remained constant during the experiments. The system operated in batch mode for the solid and liquid and semi-continuous to gas. Besides the nature of the catalyst, we studied the influence of pH of reaction medium for Mo2C carbide as well as evaluating the character of the protein inhibitor and chloride ions on the activity of catalysts Ni (20%)/Activated Carbon and bimetallic carbide Ni-Mo/Activated Carbon. The decrease in protein levels was performed by coagulation with chitosan and adsorption of chloride ions was performed by ion exchange resins. In the process of protein adsorption and chloride ions, the maximum percentage extracted was about 74% and 79% respectively. The micrographs of the powders of Mo2C and Mo2N presented in the form of homogeneous clusters, whereas for the catalysts supported on activated carbon, microporous structure proved impregnated with small particles indicating the presence of metal. The results showed high conversion of lactose to lactitol 90% for the catalyst Ni (20%)/Activated Carbon at pH 6 and 46% for the carbide Mo2C pH 8 (after addition of NH4OH) using the commercial lactose. Monitoring the evolution of the constituents present in the reaction medium was made by liquid chromatography. A kinetic model of heterogeneous Langmuir Hinshelwood type was developed which showed that the estimated constants based catalysts promoted carbide and nitride with a certain speed the adsorption, desorption and production of lactitol

ASSUNTO(S)

hidrogenação catalisadores carbeto lactose lactitol quitosana engenharia quimica hydrogenation catalytics carbide lactose lactitol chitosan

Documentos Relacionados

• Estudo da oxidação de cerâmicas à base de carbeto de silício sinterizado via fase líquida utilizando nitreto de alumínio e óxido de ítrio como aditivos
• Preparação, caracterização e avaliação de catalisadores heterogeneos a base de Pt na hidrogenação enantiosseletiva do piruvato de metila em presença de cinconidina
• Influencia de lantanideos e do titanio na hidrogenação parcial do benzeno com catalisadores a base de rutenio
• Estudo do comportamento de catalisadores massicos a base de aluminio, niquel e cobre na hidrogenação do monoxido de carbono
• Influencia do titanio em catalisadores a base de rutenio para a hidrogenação parcial de benzeno