Synthesis and Characterization of Basic Catalysts Based on Sodium–Magnesium Mixed Phosphates and Their Use in the Conversion of 2-Hexanol

✍ Scribed by Marı́a A. Aramendı́a; Victoriano Borau; César Jiménez; José M. Marinas; Francisco J. Romero; Francisco J. Urbano

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 120 KB
• Volume: 240
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2001.7565

✦ Synopsis

Various catalysts consisting of sodium-magnesium mixed orthophosphates were synthesized and characterized in structural terms using X-ray diffraction, thermogravimetric analysis, differential thermal analysis, diffuse reflectance infrared spectroscopy, and solid-state (31)P NMR spectroscopy. In addition, the surface properties of the solids were determined from N(2) adsorption-desorption isotherms and their chemical properties characterized with various titrants. One of the solids obtained consists of NaMgPO(4)/Mg(2)P(2)O(7) and the rest of NaMgPO(4)/MgO. Their surface chemical properties vary depending on the particular synthetic procedure used; thus, the NaMgPO(4)/MgO systems exhibit similar populations of acid and basic sites, whereas the NaMgPO(4)/Mg(2)P(2)O(7) systems contain many more acid sites than basic sites. All the solids obtained exhibit substantial dehydrogenating activity in the conversion of gaseous 2-hexanol; in fact, some of the NaMgPO(4)/MgO systems are even more active and selective than a MgO solid tested under identical reaction conditions. Copyright 2001 Academic Press.