Topic
Activated alumina
About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.
Papers published on a yearly basis
Papers
More filters
Patent•
15 Jan 1976TL;DR: In this article, the Claus reaction treatment of industrial gases containing hydrogen sulphide and sulphur dioxide in which the catalyst has a specific surface area of at least 80 sqm/g and is composed of activated alumina and a compound of a metal of column III A of the periodic classification of elements which is present, when calculated as the oxide, in an amount within the range of 1-20% by weight of the catalyst.
Abstract: Catalysts for Claus reaction treatment of industrial gases containing hydrogen sulphide and sulphur dioxide in which the catalyst has a specific surface area of at least 80 sqm/g and is composed of activated alumina and a compound of a metal of column III A of the periodic classification of elements which is present, when calculated as the oxide, in an amount within the range of 1-20% by weight of the catalyst
23 citations
TL;DR: In this article, an ordered porous alumina with several tens of cells was formed in 0.1 − 0.5 − M arsenic acid solutions at 310 −340 V for 20h.
23 citations
TL;DR: In this article, the authors describe the properties for adsorption of water on various forms of alumina and illustrate several conventional drying processes using alumina, including cyclic pressure swing and thermal swing adaption.
Abstract: Publisher Summary Removal of trace and bulk water from a fluid (gas or liquid) stream is a major unit operation in the chemical and petrochemical industries. The drying process is necessary to (1) prevent condensation and freeze-out of water in plant pipeline and equipment, (2) eliminate corrosion in process equipment, (3) protect against undesirable chemical reactions such as hydration and hydrolysis, (4) prevent catalyst poisoning, and (5) meet product fluid composition specification. Selective adsorption of water on a solid desiccant such as zeolites, silica gels, and activated aluminas is often used as the method of drying the fluid stream. Various forms of cyclic pressure swing adsorption (PSA) and thermal swing adsorption (TSA) concepts are generally used as the drying process. These processes utilize regenerative schemes consisting of adsorption and desorption steps so that the adsorbent can be repeatedly used for drying the fluid stream. The design and cost of operation of these processes demand certain properties for adsorption of water by the adsorbent that facilitate the adsorption and desorption steps. Activated aluminas often provide a large spectrum of desirable adsorptive properties for such drying applications. These properties include adsorption equilibria, adsorption kinetics, heats of adsorption, and adsorption and desorption column dynamics, which govern the performance of the drying process. This chapter briefly describes these properties for adsorption of water on various forms of alumina and illustrates several conventional drying processes using alumina.
23 citations
DOI•
01 Jan 2004
TL;DR: In this paper, the authors describe the different adsorption types of some classes of porous materials containing Si and Al such as silica, alumina, zeolite, and, more recently, silsesquioxane-derived.
Abstract: A main step in many industrial processes is often found in the separation and purification of products. Adsorption technology has an important role in the removal of undesired components, for instance, wastewater and air streams. There are many materials, natural or synthesized, that have sorption capacity. The most important commercial adsorbents are silica gel, activated alumina, activated carbon, and molecular sieve zeolites. The applications for these adsorbents depend on their intrinsic sorptive properties. Silica gel and activated alumina are used for the drying of gases, organic solvents, and transformer oils. Applications of zeolites are distinct from other adsorbents in that for each type, there is no distribution of pore size because the crystal lattice into which the adsorbate molecules can or cannot enter is precisely uniform. For this reason, zeolites are capable of separating effectively on the basis of molecular size. They are used, among others, for the separation of oxygen and argon, the separation of normal from branched paraffins, the drying of gases, and for the removal of water from azeotropic mixtures. Surface polarity corresponds to affinity with polar substances such as water or alcohols. Polar adsorbents are thus called ‘‘hydrophilic,’’ and aluminosilicates, such as zeolites, porous alumina, silica gel, or silica–alumina, are examples of adsorbents of this type. On the other hand, nonpolar adsorbents are generally ‘‘hydrophobic’’ such as silicalite and a new related material-type group called silsesquioxane-derived. These adsorbents have more affinity with oil or hydrocarbons than water. The basic objective of this article is to describe the different adsorption types of some classes of porous materials containing Si and Al such as silica, alumina, zeolite, and, more recently, silsesquioxane-derived. Special attention is given to matrix effect phenomena of compounds on the organoand inorganofunctionalized silica gel surface.
23 citations
TL;DR: In this paper, the results from experimental study of syngas production by catalytic cracking of tar in wastewater under supercritical condition were presented, where Ni/Al2O3 catalysts were prepared via the ultrasonic assisted incipient wetness impregnation on activated alumina, and calcined at 600°C for 4h.
23 citations