Chapter 185 The use of rare-earth-containing zeolite catalysts
作者： A. Corma , J.M. López Nieto
DOI: 10.1016/S0168-1273(00)29008-9
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摘要: Publisher Summary This chapter discusses the use of rare-earth-containing zeolite catalysts. Zeolites are tridimensional crystalline aluminosilicates with following formula in as-synthesized form: mM2/nO[xAl2O3-ySiO2]wH2O, where M is a cation which can belong to group IA or IIA be an organic cation, while n valence, and w represents water contained voids. The main characteristic zeolites that tetrahedral primary building blocks linked such way three-dimensional network containing channels cavities molecular dimensions produced. In case rare-earth-exchanged zeolite, structures A, X, Y have been most studied. synthesis these well known, all based on sodalite (β-cage) unit. A obtained by replacing each 4-ring cage at corner unit cell cube. Each body center transforms into truncated cuboctahedron twelve 4-rings, eight 6-rings, six 8-rings. octahedra form system pores three directions windows units separated from other, access them via 6-rings. topology faujasite (and related X zeolites) linking hexagonal prisms. four configuration prisms attached faces; other faces unshared, as 4-rings.
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