ChemInform Abstract: Compositional Effects on the Thermal and Structural Stability of Aluminum Phosphate Catalytic Materials.
Abstract
Al2O3/AlPO4 mixtures having P/Al ratios in the range 0.06 (8 Al2O3·AlPO4) to approximately 1 have been prepared by coprecipitation and the calcined mixtures have been studied by BET surface area measurements and X-ray analysis.
ChemInform Abstract
Al2O3/AlPO4 mixtures having P/Al ratios in the range 0.06 (8 Al2O3·AlPO4) to approximately 1 have been prepared by coprecipitation and the calcined mixtures have been studied by BET surface area measurements and X-ray analysis. It is shown that an amorphous binary oxide can be formed having physical and textural properties of a true microcomposite. Mixtures containing small amounts of AlPO4exhibit a higher thermal stability. Although macrocrystallinity does not exist for any of the samples studied, microcrystallinity is apparent at both low and high P/Al ratios, but not for any intermediate values. At the extremes, it is the dominant phase which starts to crystallize.
