Topic
Activated alumina
About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.
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TL;DR: In this paper, the ability of granular activated alumina to remove urea from wastewater through adsorption was investigated, and compared with granul activated carbon and gated activated carbon.
Abstract: This study investigated the ability of granular activated alumina to remove urea from wastewater through adsorption, and compared its performance with granular activated carbon. XRF, EDX, XRD, and ...
34 citations
Patent•
03 Oct 1972
TL;DR: An oxidation catalyst for purifying exhaust gases of internal combustion engines comprising a monolithic multicellular chemically inert refractory support of an apparent bulk density of 0.2 to 0.7 g/cc having therein 25 to 300 gas flow channels per square inch of its cross-sectional area and supporting thereon a deposit of activated alumina and at least one heavy metal oxide, the total weight of the two deposits being 130 to 500 g per liter of the catalyst as mentioned in this paper.
Abstract: An oxidation catalyst for purifying exhaust gases of internal combustion engines comprising a monolithic multicellular chemically inert refractory support of an apparent bulk density of 0.2 to 0.7 g/cc having therein 25 to 300 gas flow channels per square inch of its cross-sectional area and supporting thereon a deposit of activated alumina and a deposit of at least one heavy metal oxide, the weight ratio of the alumina to the heavy metal oxide being 1:0.2 to 1:0.5, the total weight of the two deposits being 130 to 500 g per liter of the catalyst on the average total thickness of the two deposits being 50 to 300 microns and preparing the same.
34 citations
TL;DR: In this paper, a thermodynamic and kinetic study of the adsorption of reactive dyes (yellow monochlorotriazine and yellow dichlorotrinazine), in liquid phase, on commercial alumina was presented.
Abstract: The use of nonconventional adsorbents, particularly those that can be easily regenerated, to replace activated carbon in the removal of color from dye wastewaters has been recently proposed. This work shows a thermodynamic and kinetic study of the adsorption of reactive dyes (yellow monochlorotriazine and yellow dichlorotriazine), in liquid phase, on commercial alumina. The basic thermodynamic data were obtained using the static method, with a thermostatic bath at four different temperatures (30, 40, 50 and 60oC) and different pH values. The kinetic data were obtained by adding a known quantity of adsorbent to a dye solution at a constant temperature and under controlled stirring conditions. It was possible to draw the uptake curves, using the effects of the stirring on the adsorption rate. The intraparticle effective diffusivity was estimated using the film and pore diffusion model. The results were compared with the data obtained using a commercial activated carbon.
34 citations
Patent•
17 May 1941TL;DR: Aromatic hydrocarbons are prepared by cyclization of aliphatic hydrocarbon having 6 to 12 carbon atoms, using as catalyst a compound of a metal selected from the left hand columns of Groups IV to VI of the Periodic Table, supported on a stabilizing carrier of relatively low catalytic activity, and promoted by the presence of platinum and (or) palladium.
Abstract: 555,046. Cyclizing hydrocarbons. SHELL DEVELOPMENT CO. March 18, 1942, No. 3609. Convention date, Feb. 27, 1941. [Class 2 (iii)] Aromatic hydrocarbons are prepared by cyclization of aliphatic hydrocarbons having 6 to 12 carbon atoms, using as catalyst a compound of a metal selected from the left hand columns of Groups IV to VI of the Periodic Table, supported on a stabilizing carrier of relatively low catalytic activity, and promoted by the presence of platinum and (or) palladium. The support may be an adsorptive alumina such as alumina alpha monohydrate or "activated alumina." The catalyst, which is preferably chromium oxide and may contain zinc oxide, is impregnated with a solution of a compound of the promoter, e.g. ammonium or alkali platinum chloride or barium platinum cyanide, dried and heated. Sulphates should be absent but a small amount of a potassium compound other than sulphate may be present. Examples give the conversion of heptane to toluene.
34 citations
TL;DR: In this article, a three-step method was used to synthesize nano-sized activated alumina from kaolin using an innovative three-stage method, where the surface area, pore diameter and pore volume of the as-synthesized activated alumin were 202.3m2/g, 1.212nm and 0.0613cm3/g respectively.
33 citations