Abstract
The preparation of alumina-pillared γ-zirconium phosphate materials was carried out for the first time by thermal hydrotreatment at 473 K of stable aqueous colloidal suspensions of γ-zirconium phosphate and aluminum oligomeric solutions. The nature of the resulting porous materials depends on the delamination processes used. 31P MAS NMR data suggest the existence of P−O−Al groups, and 27Al NMR analysis by means of the two-dimensional five-quanta MQMAS technique reveals the coexistence, in some cases, of octahedral, tetrahedral, and pentacoordinate aluminum. The samples, fresh and after heating at 673 K, were fully characterized by chemical analysis, X-ray diffraction analysis, thermogravimetric−differential thermal analysis, X-ray photoelectron spectroscopy, temperature-programmed desorption of NH3, pyridine adsorption coupled to IR spectroscopy, and nitrogen adsorption−desorption at 77 K.
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