Ethanol steam reforming using Ni(II)-Al(III) layered double hydroxide as catalyst precursor. Kinetic study

VERÓNICA MAS ,; BARONETTI GRACIELA,; AMADEO NORMA; MIGUEL LABORDE

CHEMICAL ENGINEERING JOURNAL

Elsevier

Lugar: Amsterdam; Año: 2008 vol. 138 p. 602 - 607

1385-8947

A preliminary kinetic study of ethanol steam reforming using a Ni(II)-Al(III) lamellar double hydroxide (LDH) as catalyst precursor is carriedout within the region of kinetic rate control. Ni(II)Al(III) precursor is synthesized by means of homogeneous precipitation by urea. Under highlydiluted feed conditions used in the kinetic experiments, products obtained are H2, CO, CO2 and traces of CH4. A parallel kinetic set is capable todescribe the product distribution obtained. Assuming power law, kinetic parameters were fitted for both reactions involved in an operation rangewhere reaction rate was assumed to be independent of water concentration. Ethanol orders were found to be lower than 1. A maximum ethanolconversion was found as a function of water concentration in the feed. Experiences with different methane concentrations showed that ethanolconversion decreases when methane concentration increases. These results reveal the existence of competitiveness between both reactants andmethane to be adsorbed in the same type of active site. In order to complete the kinetic study, the Langmuir Hinshelwood model is expected toapply.