Mixed alumina chromia pillared layered α-zirconium phosphate materials: acidity and catalytic behaviour for isopropyl alcohol decomposition

✍ Scribed by A. Jiménez-López; J. Maza-Rodríguez; E. Rodríguez-Castellón; P.Olivera Pastor

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 799 KB
• Volume: 108
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/1381-1169(95)00293-6

✦ Synopsis

The surface acidity and the catalytic behaviour of a series of mixed alumina chromia pillared cY-zirconium phosphates have been studied. The acid properties of these catalysts have been evaluated by measurements of the NH, thermal programmed desorption, pyridine adsorption and dehydration of isopropyl alcohol at 220°C. Both surface acidity and catalytic activity show a marked dependence on the AI/Cr ratio, but they are not a monotonic function of the catalyst composition. The most acid materials were those with Al/Cr ratios between 20,030 and 40/60. From this ratio, the acidity is gradually reduced with increasing Al concentration. The activity of the mixed alumina chromia pillared materials for isopropyl alcohol decomposition is considerably enhanced with respect to the analogous chromia pillared compounds of the order of 20 times for maximum activity. The most active materials were those with the highest micropore volumes. All catalysts show selectivities higher than 99% for the dehydration of isopropyl alcohol.