2020年12月1日 · In catalysis, gamma alumina (γ-Al2 O 3) is the most widely used support, because it has a high mechanical strength, can be prepared with high surface area, and is quite inexpensive to produce. In addition, alumina is used as a catalyst itself, because its surface contains acidic and basic groups.

γ-Al2O3：作为一种过渡相Al2O3，其密度约为3.42g/cm3，γ-Al2O3晶体结构中的O2-分布于立方晶格顶点处，作立方紧密堆积，Al3+分布在O2-的堆积空隙中。γ-Al2O3结构疏松吸附性强，易吸水，能被酸碱溶解，其较大的比表面积使其表面能高、活性高。

本研究分别基于 Ouyang、Pinto 和 Digne 等人提出的三种不同的 γ-Al2O3 周期模型以及它们与 Al 基体可能的取向关系构建了 γ-Al2O3/Al 界面超晶胞。 使用DFT 计算计算晶格偏移应变、界面能、粘附功和分离功。

2024年3月1日 · Herein, we study the structure of γ-Al 2 O 3 with scanning transmission electron microscopy (STEM) and ab-initio calculations and show that the structure can be interpreted as a domain microstructure of defective spinel interconnected via non-spinel segments that form the basis of antiphase boundaries (APBs).

2022年5月23日 · A γ-Al2O3 nanosheet that contains 27 % pentacoordinate Al3+ sites can nicely disperse and stabilize raft-like Pt-Sn clusters as a result of strong interactions between metal and support. Consequently, there are strong electronic interactions between the Pt and Sn atoms, resulting in an increase in the electron d. of the Pt sites.

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). (1) Although this form of alumina phase is widely used in industry, its …

2014年9月1日 · Porous γ-Al 2 O 3 generally possesses a nm-scale local structure. The tetragonal average structure contains a substantial fraction of “non-spinel” Al atoms. The concentration of “non-spinel” Al atoms correlates with surface properties.

Explore the spinel family crystalline lattice structure of Al2.67O4 m-γ cub with lattice parameters, 3d interactive image of unit cell, cif file, lattice constants & more.

TEM images and XRD patterns of γ-Al2O3 and Al2O3–NS are shown in Figure S1 and S2, respectively. γ-Al2O3 shows irregular aggregates of nanocrystals, and Al2O3–NS shows a long thin sheet morphology as the amorphous phase similar to previous reports.

2005年8月24日 · The present review discusses the most important aspects to take into consideration to improve the properties of γ-Al2O3 as a support for catalytic applications. We show that the synthetic route to γ-...