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- W1430102487 endingPage "A224" @default.
- W1430102487 startingPage "A161" @default.
- W1430102487 abstract "This chapter discusses the nature of surface sites and groups, which are present on oxides and zeolites, and how the distribution and nature of these sites might be varied by physical or chemical intervention. The surfaces of oxides contain dangling bonds or defects whose valency requirements are satisfied by a chemical reaction with the ambient atmosphere and/or a reconstruction of the near surface atoms. Therefore, most oxide surfaces of interest in catalysis contain a variety of sites ranging from hydroxyl groups, coordinatively unsaturated Lewis acid and base sites, and perhaps Bronsted acid/base sites. The site mixture depends on the nature of the oxide however it can also vary according to the preparative method used, on the conditions of activation in air or in vacuum and on the presence of foreign species, either as impurities, or intentionally added. The chapter presents the use of two major techniques, the now well established vibrational spectroscopic methods (mainly infrared and Raman spectroscopies) and the newer technique of solid state Magic Angle Spinning (MAS) nuclear magnetic resonance spectroscopy." @default.
- W1430102487 created "2016-06-24" @default.
- W1430102487 creator A5087418741 @default.
- W1430102487 date "1990-01-01" @default.
- W1430102487 modified "2023-10-15" @default.
- W1430102487 title "Chapter 3 Surface Groups on Oxides" @default.
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