Abstract

A periodic Hartree-Fock study of Ti-containing zeolites was performed. The zeolitic framework was modeled by means of the chabazite structure. Two framework compositions were considered (TiO( Si1Ti )40 and 0.5) and the corresponding periodic structures were optimized in order to estimate the geometric and energetic features of the Ti sites. Cluster models were also considered for comparison. It arises that the main structural distortion of the zeolite lattice upon SiOTi substitution comes from the increment of the T-site volume. From the obtained results, the limitations of the different models are discussed.

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