Characterization of organically pillared zirconium phosphates
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Samples of -zirconium phosphates and of zirconium phosphates pillared by phenyl, dimethylphenyl, and diphenyl have been characterized by BET surface area, surface acidity, adsorption capacity and pore sizes, TGA, X-ray powder diffraction, and activity for isopropanol decomposition. The BET surface areas of pillared zirconium phosphates have been found to increase with the increase in size and number of organic groups in the interlayers. The total number of surface acidic sites of -zirconium phosphates has been found to be greater than any one of the pillared catalysts. It is concluded from this study that -zirconium phosphate pillared by diphenyl has interlayer openings large enough to sorb isopropanol, and its decomposition takes place mainly in the interlayers of this catalyst. In contrast, the phenyl and dimethylphenyl pillared zirconium phosphates have less free space between the interlayers so that the reactions of isopropanol take place on the outer surface of the catalysts. The dehydration of isopropanol to propylene has been found to be the primary reaction for all the catalysts. 1986.
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