Abstract:
Un procédé de durcissement uniforme de matériau moulé plastsiquement déformable, qui comprend des particules de matière conductrice d'électricité et des agents plastifiants, est présenté. Ce procédé comprend l'induction d'un courant électrique, ou la création de pertes par hystérisis à l'intérieur d'un tel matériau, en recourant à une radiation électromagnétique de fréquences situées entre 50 Hertz environ et 10 Mégahertz environ, en vue de provoquer le chauffage du matériau.
Abstract:
Mesoporous carbon and method of making involves forming a mixture of a high carbon-yielding carbon precursor that when carbonized yields greater than about 40% carbon on a cured basis, and an additive that can be catalyst metal and/or low carbon-yielding carbon precursor that when carbonized yields no greater than about 40% by weight carbon on a cured basis. When a catalyst metal is used, the amount of catalyst metal after the subsequent carbonization step is no greater than about 1 wt. % based on the carbon. The mixture is cured, and the carbon precursors are carbonized and activated to produce mesoporous activated carbon.
Abstract:
A batch, which fires to yield ceramic cordierite as the principal phase, consists of (i) a mineral component comprising clay and talc, and (ii) 5-50 wt.% of a chemical component comprising powdered oxides, hydroxides and hydrous oxides of Mg, Al and Si. The chemical component pref. comprises Mg, Al and Si oxide cpds. in a proportion to yield cordierite as a principal phase. The batch yields at least 94% cordierite on firing and has an overall compsn. of 47-53% SiO2, 33-41% Al2O3 and 11-17% MgO and the chemical component is 25-40 wt.% of the batch, or the overall compsn. of the batch is 41-56.5% SiO2, 30-50% Al2O3 and 9-20% MgO. Clay and talc are the sole sources of SiO2 and MgO in the mineral component.
Abstract:
A ceramic comprising predominately a cordierite-type phase approximating the stoichiometry Mg 2 Al 4 Si 5 O 18 and having a coefficient of thermal expansion (25-800° C.) of greater than 4x10 -7 /° C. and less than 13x10 -7 /° C. and a permeability and a pore size distribution which satisfy the relation 2.108 (permeability)+18.511 (total pore volume)+0.1863 (percentage of total pore volume comprised of pores between 4 and 40 micrometers)>24.6. The ceramic is suitable in the fabrication of cellular, wall-flow, diesel particulate filters having a pressure drop in kPa that at an artificial carbon soot loading of 5 grams/liter and a flow rate of 26 scfm is less than 8.9-0.035 (number of cells per square inch)+300 (cell wall thickness in inches), a bulk filter density of at least 0.60 g/cm 3 and a volumetric heat capacity of at least 0.67 J cm -3 K -1 as measured at 500° C.
Abstract:
A batch, which fires to yield ceramic cordierite as the principal phase, consists of (i) a mineral component comprising clay and talc, and (ii) 5-50 wt.% of a chemical component comprising powdered oxides, hydroxides and hydrous oxides of Mg, Al and Si. The chemical component pref. comprises Mg, Al and Si oxide cpds. in a proportion to yield cordierite as a principal phase. The batch yields at least 94% cordierite on firing and has an overall compsn. of 47-53% SiO2, 33-41% Al2O3 and 11-17% MgO and the chemical component is 25-40 wt.% of the batch, or the overall compsn. of the batch is 41-56.5% SiO2, 30-50% Al2O3 and 9-20% MgO. Clay and talc are the sole sources of SiO2 and MgO in the mineral component.
Abstract:
Uniformally heating a plastic deformable material (I) contg. particles of an electrically conducting material comprises inducing an electrical current in the material using electromagnetic radiation of frequency 50 Hz-approx. 10 MHz to cause induction heating. USE/ADVANTAGE - The process can be used to harden the plastic deformable material, to heat or "burn out" volatile components or to sinter particulate electrically conductive materials.
Abstract:
The instant invention is directed at an apparatus for removing VOC's from an exhaust gas stream comprised of the following: a heatable adsorber located in the exhaust stream capable of desorption; and, an oxidizer structure having a lightoff temperature and located in the exhaust stream downstream from the adsorber structure. One particular embodiment of the apparatus comprises the following two elements: (1) a resistively heatable adsorber possessing an activated carbon phase located in the exhaust stream and having a desorption temperature; and, (2) an electrically heatable catalyst structure having a lightoff temperature and located in the exhaust stream downstream from the adsorber structure. The method enabled as a result of the development of the aforementioned apparatus, i.e., a method for removing VOC's from an exhaust stream, involves two essential steps: (1) causing exhaust gases from an exhaust gas stream to flow through an adsorber structure and an oxidizer while adsorbing an amount of VOC's; and, (2) heating the oxidizer to its lightoff temperature and desorbing the adsorbed VOC's and thereafter flowing the desorbed compounds through the oxidizer whereupon they are oxidized. One particular embodiment involves two essential steps: (1) flowing VOC-containing exhaust gases through an adsorber structure having an activated carbon phase and an electrically heatable catalyzed structure while adsorbing an amount of VOC's; and, (2) heating the catalyzed structure to its lightoff temperature, desorbing the adsorbed VOC's and thereafter flowing the desorbed compounds through the catalyzed structure whereupon the desorbed VOC's are oxidized.