Chapter 3 Surface Groups on Oxides

摘要: Publisher Summary This chapter discusses the nature of surface sites and groups, which are present on oxides zeolites, how distribution these might be varied by physical or chemical intervention. The surfaces contain dangling bonds defects whose valency requirements satisfied a reaction with ambient atmosphere and/or reconstruction near atoms. Therefore, most oxide interest in catalysis variety ranging from hydroxyl coordinatively unsaturated Lewis acid base sites, perhaps Bronsted acid/base sites. site mixture depends however it can also vary according to preparative method used, conditions activation air vacuum presence foreign species, either as impurities, intentionally added. presents use two major techniques, now well established vibrational spectroscopic methods (mainly infrared Raman spectroscopies) newer technique solid state Magic Angle Spinning (MAS) nuclear magnetic resonance spectroscopy.