Ni(II)-Al(III) layered double hydroxide as catalyst precursor for ethanol steam reforming: Activation treatments and kinetic studies

✍ Scribed by Verónica Mas; María L. Dieuzeide; Matías Jobbágy; Graciela Baronetti; Norma Amadeo; Miguel Laborde

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 482 KB
• Volume: 133-135
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.11.032

✦ Synopsis

The kinetic behaviour of the steam reforming reaction using Ni(II)-Al(III) layered double hydroxide (LDH) as catalyst precursor is studied. The carbonate form of Ni(II)-Al(III) LDH (takovite) was prepared using an homogeneous alkalinization procedure, by means of the thermal hydrolysis of urea. Different activation treatments of Ni(II)Al(III) precursor are analysed; it was found that the catalyst which presents the higher activity in methane steam reforming, is that obtained by pure H 2 reduction of precursor without previous calcination. The H 2 yield for ethanol steam reforming using the reduced LDH sample reaches values of 5 mol of H 2 per mol of ethanol in the feed. The others products obtained, operating between 823 and 923 K, are CO, CO 2 and CH 4 . It is found that the reaction order respect to ethanol is lower than 1. It is verified that, for each reaction temperature, there is a water/ethanol molar ratio at which ethanol conversion has a maximum. It means that a competition between both reactants adsorbed on the same active sites is verified.