Frame Catalysts of Al2O3–ZrO2–CeO2 System

Selectivity of Ethanol Conversion on Al/Zr/Ce Mixed Oxides: Dehydration and Dehydrogenation Pathways Based on Surface Acidity Properties

“…[32] The weakly formed diffuse reflexes were fixed in the regions corresponding to the phases of zirconium dioxide and transition forms of aluminum oxide (Figure 1a), as discussed in our previous study. [32,33] The crystalline forms of Al 2 O 3 were not identified because of the low intensity of the corresponding reflexes, determined by the nanoscale dimensionality of the objects. [32] However, the Al-rich oxides A50CZ and A75CZ showed very broad diffraction peaks at 2θ values of 45.9°and 66.7°, respectively, which correspond to the γ-alumina phase.…”

“…[32,33] The crystalline forms of Al 2 O 3 were not identified because of the low intensity of the corresponding reflexes, determined by the nanoscale dimensionality of the objects. [32] However, the Al-rich oxides A50CZ and A75CZ showed very broad diffraction peaks at 2θ values of 45.9°and 66.7°, respectively, which correspond to the γ-alumina phase. [31] Up to 950 °C, A5CZ consisted predominantly of the so-called pseudo-cubic phase (an intermediate phase between metastable tetragonal and cubic phases [14,34] ).…”

“…After heat treatment at 500 °C, the obtained diffraction peaks were very broad, making it difficult to identify the presence of the metastable tetragonal phases of zirconia [32] . The weakly formed diffuse reflexes were fixed in the regions corresponding to the phases of zirconium dioxide and transition forms of aluminum oxide (Figure 1a), as discussed in our previous study [32,33] . The crystalline forms of Al 2 O 3 were not identified because of the low intensity of the corresponding reflexes, determined by the nanoscale dimensionality of the objects [32] .…”