Aluminium oxide (Al2O3), commonly known as alumina, is a widespread naturally occurring compound that has a broad range of industrial applications. Besides its use as a pigment or abrasive, alumina also plays a vital role as catalyst support for desulfurization or hydrogenation reactions. In the latter case, the active phase on the catalyst often consists of nickel metal nanoparticles. The inte...

in this study, preparation of nano-sized gamma alumina with high specific surface area and high yield by thereaction between aluminum nitrate and sodium carbonate, without using any surfactant is reported. bohemite (aluminum oxyhydroxide) was prepared as a precursor by strict control of ph and reaction temperature. the gel produced was purified by washing followed by centrifugation. the specifi...

Preferential oxidation (PROX) of CO is the most efficient way to remove CO from reformate streams for PEM fuel cells. Pt/Al2O3 has long been used for this purpose. Pt/Al2O3 catalysts are effective for preferential oxidation of CO only at temperatures above 150°C, and the maximum CO conversion usually takes place at around 200°C. In this study, promotion of Pt/Al2O3 with transition metals result...

It is of great importance to develop a spherical γ-alumina support with high hydrothermal stability be used in platinum reforming catalyst processes. The porous pseudo-boehmite powder surface area was first synthesized via simple separate nucleation and aging steps method, then as precursor produce γ-Al2O3 an oil–ammonia column method. as-synthesized has substantially greater specific 336.0 m2·...

The VOx/γ-Al2O3 catalyst VA-200, which was introduced in a previous article, is further characterized by XPS and visible Raman spectroscopy. The reoxidation of highly dispersed VOx species with gas phase oxygen is investigated in detail and is described by an empirical kinetic model. It is observed that the reoxidation of reduced VOx/γ-Al2O3 catalyst is strongly affected by the presence of wate...

Cu–Zn/γ–Al2O3 catalysts were prepared by the impregnation method. Catalytic activity was evaluated for N2O decomposition in a fixed bed reactor. The fresh and used catalysts were characterized by several techniques such as BET surface area, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The Cu–Zn/γ–Al2O3 catalysts exhibit high activity and stability for N2O decomposition in mi...

In this work, physical phenomena related to the growth and phase formation of alumina, Al2O3, are investigated by experiments and computer calculations. Alumina finds applications in a wide variety of areas, due to many beneficial properties and several existing crystalline phases. For example, the α and κ phases are widely used as wear-resistant coatings due to their hardness and thermal stabi...