On the structure of γ-Al2O3 - ScienceDirect
2020年12月1日 · The most important application of alumina as catalyst is in the removal of H 2 S from gas streams in refineries by the Claus reaction, the transformation of H 2 S into sulfur. Other applications are the dehydration of alcohols to alkenes and ethers (as in the reaction of methanol to hydrocarbons or alkenes, the MTG or MTO processes), the ...
Structure and Energetics of (111) Surface of γ-Al
2018年2月13日 · One of the important forms of alumina phases determined by experimental investigations on deposited Al/Al 2 O 3 multilayers is the so-called γ-alumina (γ-Al 2 O 3). Although this form of alumina phase is widely used in industry, its accurate structure is still controversial. Understanding its structure and the corresponding properties ...
Characterization of the atomic-level structure of γ-alumina and …
2023年2月15日 · In this work, γ-alumina is formed by re-crystallization of partially amorphized sapphire. The transition aluminas that develop on the amorphous→ γ→ δ→ θ→ α-alumina transformation path progress mainly by rearrangement of Al within the oxygen sublattice.
Hydration Structures on γ-Alumina Surfaces With and Without ...
2022年11月2日 · It is demonstrated that γ-alumina is converted into a hydrated boehmite (AlOOH) phase with significantly decreased acidity and surface area. For metal-free γ-alumina, the transformation is completed within 10 h, whereas the presence of nickel and platinum particles significantly retards the formation of boehmite.
Sintering behavior of ultra-thin 3D printed alumina lattice …
2023年5月15日 · An alumina ceramic cream called “3DMix AL-E02” produced by the manufacturer was used to print the lattices structures. In order to explore the lattice structure resistance to sintering (from strong structures to very thin and fragile structures), we chose a lattice design with rod diameters decreasing from 3 mm to 0.5 mm.
cles’ alumina are also used as fillers for ceramic matrix. hases of alumina, also known as “Transi. not a transition alumina, it is the la. ub-lattice th. p Fd3m [12, 13], was the first cla. sified as a transition alumina phase by Ulrich [14]. The gamma prefix has b. ave shown that theta phase (θ-Al2O3) appears at high temperature. alc.
Structural Effects of Lanthanide Dopants on Alumina
2017年1月6日 · In this study, Ln-doping (400 ppm) of the alumina lattice crucially delays the onset of phase transformation and enables phase population control, which is achieved without the formation of new...
TEM Characterization of Lattice Defects Associated with ... - Springer
2022年1月25日 · Alumina (α-Al 2 O 3) is one of the representative structural ceramics. To understand its mechanical responses, the lattice defect behavior of alumina has been investigated by transmission electron microscopy (TEM) for many years. In this report, we review our recent research progress on TEM structural analysis of lattice defects in alumina.
WebElements Periodic Table » Aluminium » crystal structures
This WebElements periodic table page contains crystal structures for the element aluminium
Evolution of High Symmetry Points of Photonic Alumina …
2021年9月23日 · Therefore, the reported lithography-free alumina-based nanofabrication offers an ability for varying the spatial structure at high symmetry points of photonic lattices, which is of great significance in the fields of nanomanufacturing and has great potential to bring about preferable performances in nanodevices.