Structure and texture of AlPO4-cesium oxide (20 wt.%) catalysts obtained by impregnation with cesium chloride

AlPO4-cesium oxide (20 wt.%) materials retain a low degree of crystallinity on calcination at 873 K for 3 h. After DTA measurements (1423 K), AlPO4 crystallizes (tridymite form). Furthermore, DRIFT spectroscopy shows that the P−OH stretching vibration (at 3670 cm−1) of AlPO4 support disappears upon cesium oxide loading. Moreover, Al and P atoms remain in tetrahedral coordination as in unmodified AlPO4. Furthermore, the incorporation of cesium oxide leads, simultaneously, to a progressive decrease in surface area and pore volume as well as to an increase in the most frequently occurring pore radius.