SURFACE AND STRUCTURAL-PROPERTIES OF NOVEL TITANIUM PHOSPHATES

Two novel fibrous framework titanium phosphates having a similar formu la, Ti2O(PO4)(2) . H2O, and a layered titanium phosphate, Ti2O3(H2PO4) (2) . 2(H)2, were synthesized and their properties were characterized with physicochemical methods, such as elemental analysis, thermogravim etry, nitrogen adsorption, X-ray diffraction, and P-31 solid-state NMR . Nitrogen adsorption isotherms were measured on synthesized titanium phosphates in order to characterize their surface and structural prope rties. The specific surface area and total pore volume of the titanium phosphates studied were determined, The low-pressure nitrogen adsorpt ion isotherms were used to evaluate surface heterogeneity of the synth esized materials by employing an advanced numerical procedure based on the regularization method. (C) 1997 Academic Press.