Showing papers on "Activated alumina published in 1972"
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
Patent•
13 Mar 1972
TL;DR: The shrinkage of organic plastics can be controlled by incorporating an admixture of solid particulate gas carriers, such as fluid coke, activated alumina, activated bauxite, silica gel, and delayed coke as discussed by the authors.
Abstract: The shrinkage of organic plastics, such as polyepoxies and polyesters, can be controlled by incorporating therein an admixture of solid particulate gas carriers, such as fluid coke, activated alumina, activated bauxite, silica gel, and delayed coke.
8 citations
Dissertation•
01 Jan 1972
TL;DR: In this paper, the effects of water composition as they apply to the design of activated alumina and virgin and regenerated bone char defluoridation units were studied. And the results showed that ionic strength, divalent metal ions, arsenic, and pH connected to buffering capacity have significant effects.
Abstract: The effects of water composition as they apply to the design of virgin and regenerated activated alumina and virgin and regenerated bone char defluoridation units were studied. Freundlich isotherm analysis was used to determine the degree of the effect compared to an arbitrary standard. The results showed that ionic strength, divalent metal ions, arsenic, and pH connected to buffering capacity have significant effects. The anions sulfate, nitrate, and chloride showed negligible effect on the removal of fluoride.
3 citations
TL;DR: In this paper, the radioisotope 99Mo generated through the fission of neutron-irradiated uranium targets was separated in an extremely radiochemically pure state, and the target dissolution mixture was run on a silica gel column whereby the serious radiocontaminants of 99Mo, was adsorbed on the gel.
Abstract: The radioisotope99Mo generated through the fission of neutron-irradiated uranium targets was separated in an extremely radiochemically pure state. The target dissolution mixture was run on a silica gel column whereby the95Zr−95Nb activity, the serious radiocontaminants of99Mo, was adsorbed on the gel. The effluent from the gel column was processed and treated with sodium dihydrogen phosphate. The processed solution was run on an activated alumina column whereby99Mo was adsorbed as phospho-molybdate complex ion, then desorbed from the column as the molybdate ion by eluting with 10% NaOH solution. By recycling the adsorption and desorption steps on alumnia,99Mo was finally obtained totally free from all other radiocontaminants.
3 citations
Patent•
25 May 1972TL;DR: In this paper, the authors present a method of pre-preparing a CATALYST system with COPPPER, CHROMIC OXIDE, MANGANESE DIOXIDE and PALLADIUM on a porous support.
Abstract: THE PRESENT INVENTION IS DIRECTED TO AN IMPOVED METHOD OF PREPARING CATALYTIC SYSTEMS CONTAINING COPPPER OXIDE, CHROMIC OXIDE, MANGANSESE DIOXIDE, AND PALLADIUM ON A POROUS SUPPORT THE METHOD INCLUDES IMPREGENATING A SUPPORT WHICH MAY BE ACTIVATED ALUMINA WITH AQUEOUS COPPER DICHROMATE SOLUTION, DRYING THE IMPREGNATED SUPPORT, IMPREGNATING THE DRIED SUPPORT WITH A MANGANESE SALT-PALLALDIUM SALT SOLUTION, DRYING THE RESULTING CATALYST SYSTEM, AND ACTIVATING THE CATALYST BY CALCINATION CATALYSTS PREPARED BY THIS METHOD ARE TYPICALLY CHARACTERIZED WITH EXCELLENT CRUSHING STRENGTH AND IMPROVED RESISTANCE TO SHRINKAGE THE CATALYSTS ARE ESPECIALLY USEFUL FOR TREATING EXHAUST GASES FROM INTERNAL COMBUSTION ENGINES
1 citations
1 citations