Guidelines for Mastering the Properties of Molecular Sieves: Relationship between the Physicochemical Properties of Zeolitic Systems and Their Low Dim [Paperback]

Low dimensionality is a multifarious concept which applies to very diversified materials. Thus, examples of low-dimensional systems are structures with one or several layers, single lines or patterns of lines, and small clusters isolated or dispersed in solid systems. Such low? dimensional features can be produced in a wide variety of materials systems with a broad spectrum of scientific and practical interests. These features, in turn, induce specific properties and, particularly, specific transport properties. In the case of zeolites, low dimensionality appears in the network of small-diameter pores of molecular size, extending in one, two or three di? mensions, that these solids exhibit as a characteristic feature and which explains the term of molecular sieves currently used to name these ma? terials. Indeed, a large number of industrial processes for separation of gases and liquids, and for catalysis are based upon the use of this low? dimensional feature in zeolites. For instance, zeolites constitute the first class of catalysts employed allover the world. Because of the peculiarity and flexibility of their structure (and composition), zeolites can be adapted to suit many specific and diversified applications. For this reason, zeolites are presently the object of a large and fast-growing interest among chemists and chemical engineers.Orientation of Chemical Properties by Direct Synthesis of Molecular Sieves.- Effects of substitution in SAPO-n frameworks on their properties as acid catalysts.- Zeolite synthesis and crystal tailoring.- New mobilizing and templating agents in the synthesis of crystalline microporous solids.- A 13C- and 129Xe- NMR study of the role of the tetraalkylammonium cations in the synthesis of high-silica zeolites.- Promoter effects on phase growth in aluminophosphate and silicalumino-phosphate gel systems.- Characterisation of Structural and Physicochemical Properties of Zeolitic Systems.- Recent advances in techniques for characterizinlÓ@