Activated alumina

About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.

On the preferential electrification of some dusts Part II: Release of gas from monodisperse powders of porous alumina, following adsorption of nitrous oxide

Abstract: Rates of release of nitrous oxide, from monodisperse fractions of activated alumina, are measured at room temperature and atmospheric pressure. The values obtained follow a simple first-order law with respect to the gas adsorbed, the relative parameters depending strongly on the size of the particulates examined (5 to 50 micron).

Preparation of catalyst carrier for purifying exhaust gas

Abstract: PURPOSE:To stabilize a catalyst support layer and to enhance catalytic activity, by a method wherein a slurry mixture of an activated alumina powder, a water soluble rare earth metal salt and water is adhered to the surface of a catalyst carrier and dried and baked to form an activated alumina layer to the surface of the carrier CONSTITUTION:A slurry mixture of an activated alumina powder, a water soluble rare earth metal salt and water is prepared to be adhered to the surface of a catalyst carrier base material and subsequently dried and baked to obtain an exhaust gas purifying catalyst carrier wherein an activated alumina layer containing at least a rare earth metal element is formed to the surface of the catalyst carrier base material In the obtained catalyst carrier, the rare earth metal element, for example, La is diffused during stirring and the La-ion enters the lattice of activated alumina such as gamma-alumina, delta-alumina or theta-alumina having a large gap to stabilize the crystal structure of the carrier

Co-pyrolysis of 1,1,2-trichloroethane and methanol on activated alumina

Abstract: The copyrolysis of 1,1,2-trichloroethane (TCE) and methanol on activated alumina was carried out at 250∼400°C. 1,1-dichloroethylene (VDC) to 1,2-dichloroethylene (DE) ratio amounted to several times of the ordinary pyrolysis. This reaction proceeded as follows. CH2ClCHCl2 + CH3OH → CH2:CCl2 + CH3Cl + H2O

Highly Efficient Removal of Chromium (VI) from Water by Mesoporous Alumina

Abstract: Mesoporous Activated alumina (MAA) was used for removal of hexavalent chromium fromwater. The activated alumina wascharacterized for Powder X-ray diffraction (XRD), Scanning Electron Microscope (SEM).The characterized adsorbent was evaluated for the removal of chromium (VI) from water. The adsorption efficiency of activated alumina was studied by batch adsorption study. MAA exhibit highly efficient removal with more than 99% removal at initial concentration of 5 mg/l. The experimental data was fitted to Langmuir and Freundlich adsorption model and found that Langmuir model fits well confirming mechanism of monolayer adsorption on uniform surface. The adsorption kinetic data was well described by pseudo first order kinetics.The residual Cr(VI) concentrations after treatment with MAA were below the prescribed limits as per WHO and Indian Drinking water standards.

Study on cleaning solvents using activated alumina in PUREX process

Abstract: Abstract The PUREX process is used to extract uranium and plutonium from dissolved solutions (spent nuclear fuel liquor). The extractant is 30% tributyl phosphate in n-dodecane, which is known to be degradable by radiation and nitric acid. Tributyl phosphate degradation products can generally be washed in alkali solutions like sodium carbonate solution; however, it is more difficult to remove n-dodecane degradation products using this method. A method of cleaning solvents using activated alumina is discussed in this study. A degradation sample of 30% TBP/n-dodecane was prepared by irradiating (1.6 MGy) with a 60Co gamma-source. The degradation products were then qualitatively analyzed using a gas chromatography-mass spectrometer (GC-MS). After being irradiated the solvents were cleaned with activated alumina, and a phase separation test with performed in evaluating the cleaned solvent. This resulted in the discovery of a procedure for the removal of n-dodecane degradation products of dodecanol and dodecanone, with about 70% of the degradation products, and the phase separation performance could be clearly improved through use of activated alumina.