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Studies on PO43−/ZrO2: II. Effect of Phosphate Concentration and Activation Temperature on the Catalytic Properties of Zirconia

✍ Scribed by P.K. Pattnayak; K.M. Parida

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
119 KB
Volume
226
Category
Article
ISSN
0021-9797

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✦ Synopsis

The effect of activation temperature and phosphate concentration on the catalytic properties of phosphated zirconia (PO 3- 4 /ZrO 2 ) has been described. XRD patterns show that phosphate stabilizes the tetragonal phase of ZrO 2 up to 1000 • C but the crystallization temperature is delayed with increases in the concentration of phosphate. Surface area and surface acidity of the samples increase with increases in the phosphate up to a certain concentration and decrease with further increases. The cumene cracking/ dehydrogenation and 2-propanol conversion reactions are carried out to evaluate the catalytic properties of the samples. The nature of sites present on the samples has been determined and discussed by correlation of the concentration of phosphate, activation temperature, and activity and selectivity to a particular product. Among the 400, 500, and 600 • C activated samples, the 500 • C sample has shown maximum activity toward the above reactions.

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