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- W2146906237 abstract "The present work attempts a systematic examination of the effect of sulphate content on the physico-chemical properties and catalytic activity of sulphated zirconia and iron promoted sulphated zirconia systems. Sulphate content is estimated by EDX analysis. The amount of su lphate incorporated has been found to influence the surface area, crystal structure a nd the ac id strength di stribution. Ammonia TPD and adsorption studies using perylene have enabled the determinal io n of surface acidic properties. The re sults are supported by the thermodesorption studies using pyridine and 2,6-dimethylpyridine. The cata lytic activity towards benzoylati on reaction has been correlated with the surface acidity of the systems. Hydrous zirconium oxide, when modified by anions like sulphate, has been reported to form highly acidic or superacidic catalyst depending on the treatment conditions . 3. The type of precursor and precipitating agent. solution pH, sulphating agent employed, method of impregnation, calcination temperature etc. playa crucial role in deciding the final properties 4.7. A major shortcoming of this category of catalysts is th e rapid deactivation due to coke formation at high temperatures. Modification with various transition metal ions has been reported to alter the properties of the system depending on the nature of the Ion . d 8 9 IIl corporate ' . The present investigation sets out to study the effect of calcination temperature and sulphate content on the physico-chemical properties and catalytic activity of sulphated zirconia systems and to estimate the in fI uence of Fe(lll) as promoter." @default.
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- W2146906237 date "2003-08-01" @default.
- W2146906237 modified "2023-09-27" @default.
- W2146906237 title "Influence of sulphate content on the physico-chemical properties and catalytic activity of some sulphated zirconia systems" @default.
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