Abstract
The AlPO4 content in CrPO4−AlPO4 (CrAlP-A) systems has a marked influence on thermal behavior, speeding up the transformation of amorphous CrPO4 to crystalline β-CrPO4. Thus, XRD analysis showed that amorphous systems are formed at AlPO4 loadings less than 50 wt.% and calcination temperatures below 1273 K. Moreover, on 50 wt.% AlPO4 developed crystalline β-CrPO4 in CrAlP-A systems for every calcination temperature. Besides, at 1273 K crystalline systems (β-CrPO4 and tridimite-AlPO4) are formed for every composition. Moreover, surface area at any calcination temperature increases with the rise in the AlPO4 content. Also, a surface area decrease on increasing calcination temperature is shown. Furthermore, CrAlP-A catalysts thermally treated below 1273 K only exhibited hydrogen bonded hydroxy groups (υO-H≃3450 cm-1).
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Bautista, F.M., Campelo, J.M., Garcia, A. et al. Chromium-aluminium orthophosphates, II. Effect of AlPO4 loading on structure and texture of CrPO4−AlPO4 (20–50 wt.% AlPO4 catalysts obtained in aqueous ammonia. React Kinet Catal Lett 53, 45–53 (1994). https://doi.org/10.1007/BF02070112
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DOI: https://doi.org/10.1007/BF02070112