摘要:
A method of increasing the selective desulfurization of naphtha feed streams that includes: combining a naphtha feed stream with a hydrogen containing gas to form a combined feed stream and reacting the combined feed stream over a monolithic honeycomb catalyst bed containing hydrodesulfurization catalyst components to give a desulfurized naphtha. In conducting such an illustrative embodiment, the percent desulfurization of the naphtha is preferably greater than about 50% and the percent olefin hydrogenation of the naphtha is preferably less than about 50%. The monolithic honeycomb catalyst bed of one alternative and illustrative embodiment preferably has a channel density of about 25 to 1600 cells per square inch; a channel size from about 0.1 to 10 mm; and a channel wall thickness of about 0.01 to about 2.0 mm. The illustrative method should be carried out such that the octane number (R+M/2) of the naphtha feed stream is reduced by no more than 3.0 at 95% desulfurization and preferably no more than 1.5. The hydrodesulfurization catalyst components include a powdered refractory oxide and transition metal catalyst compounds. Alternatively the hydrodesulfurization catalyst components may be impregnated into the monolithic honeycomb catalyst bed itself. Preferable hydrodesulfurization catalyst components include a Group VIII metal containing compound and a Group VIB metal containing compound. Alternatively the hydrodesulfurization catalyst components may further include a phosphorous promoter.
摘要:
A device for use in processing of a liquid and/or gas stream. The device is made up of a monolithic structure having active powder for treating streams. The structure has an inlet end and an outlet end and a multiplicity of cells extending from inlet end to outlet end. The cells are separated from one another by porous walls, a portion of the total number of cells being plugged in a pattern such that a stream enters the device through the unplugged cells at the inlet end and passes through at least two porous walls and the active powder in-between, and thereafter passes out of the device through unplugged cells at the outlet end. The device finds use in a number of applications including ion exchange, adsorption, biological and chemical reactions, and catalytic applications.
摘要:
A monolithic structure having active material that includes at least inorganic ion exchange material, for purifying a liquid stream of contaminants such as heavy metals, chlorine, volatile organics, pesticides, herbicides, and/or parasites, etc. The structure has an inlet end and an outlet end and a multiplicity of cells extending from inlet to outlet end. The cells are separated from one another by porous walls that are alternatively plugged at each end such that a liquid stream that enters the structure, enters through the unplugged cells at the inlet end and passes through porous walls to be purified by the active material, and thereafter passes out of the structure through unplugged cells at the outlet end. One method of making the structure involves applying active material as a coating on an alternately plugged substrate. The average particle size of the active material after calcination is greater than the average cell wall pore size of the substrate. The coated substrate is dried at no greater than 200° C., and calcined at no greater than 650° C., to bond the active material to the substrate. The structure can be shaped from a forming mixture of the active materials.
摘要:
Substantially non-microcracked, porous, cordierite ceramic honeycomb bodies are provided. Although exhibiting moderately high thermal expansion (CTE) between 7×10−7 to 16×10−7/° C. (25-800° C.), the honeycomb bodies exhibit relatively high thermal shock parameter (TSP), such as TSR≧525° C. by virtue of a high MOR/E ratio, and/or low Eratio=ERT/E1000° C. and well interconnected porosity, as witnessed by a relatively high pore connectivity factor (PCF). A method of manufacturing the honeycomb ceramic structure is also provided.
摘要:
Porous ceramic catalyst supports or filters to be provided with catalyst coatings via oxide washcoating processes are pre-coated with cross-linked polymer barrier layers to prevent washcoat nanoparticle intrusion into the microcracked and/or microporous surfaces of the ceramics, the barrier coatings being formed by thermally cross-linking hydrocarbon polymers that are vaporizable at moderate washcoat stabilization or catalyst activation temperatures and that preferentially block the micropore/microchannel pore volume of the article.
摘要:
A diesel particulate filter having a honeycomb body composed of cordierite and exhibiting a CTE (25-800° C.) of less than 13×10−7/° C.; a median pore diameter, d50, of less than 25 μm; % porosity not less than 53%; and a narrow pore size distribution wherein a value of d50−d10)/d50 is not greater than 0.6; and a value of d90 less than 40 μm wherein d10, and d90 are pore diameters at 10% and 90% of the pore size distribution on a volumetric basis, and d10
摘要:
Porous ceramic catalyst supports or filters to be provided with catalyst coatings via oxide washcoating processes are pre-coated with cross-linked polymer barrier layers to prevent washcoat nanoparticle intrusion into the microcracked and/or microporous surfaces of the ceramics, the barrier coatings being formed by thermally cross-linking hydrocarbon polymers that are vaporizable at moderate washcoat stabilization or catalyst activation temperatures and being preferentially
摘要:
Carbon monolith-supported catalysts with high leach resistance used in catalytic applications involving strong acidic and basic conditions in a pH range of from 0 to 6.5 and from 7.5 to 14, are respectively described. The leach resistance of the catalyst system originates from strong interaction between the catalyst and the unsaturated valence of the carbon surface. In addition to surprisingly high resistance to leach out, the catalysts also have substantial differential advantages in catalyst performance: catalyst activity, selectivity, and stability.
摘要:
In connection with drawing a fiber in a drawing portion of a drawing device having a refractory, oxide component, a method and apparatus provide an environment in the drawing portion that causes active oxidation of a refractory contaminant on a blank. The active oxidation of the refractory contaminant causes it to corrode away during drawing.
摘要:
A cyst reduction water filter and a method and carafe system for using it, wherein the filter incorporates a cellular ceramic honeycomb filter element of a selectively plugged channel configuration wherein all water filtration paths traverse porous channel walls, the walls exhibiting open porosity characterized by a median pore diameter in the range of about 2-8 micrometers and with pores over 10 microns in diameter comprising not more than 10% of the open pore volume, and wherein the filter element has a primed water flux of at least 0.3 ml/min/cm3 under a water pressure of 0.3 psig.
摘要翻译:一种囊肿还原水过滤器及其使用的方法和保鲜系统,其中所述过滤器包括选择性堵塞通道构造的蜂窝陶瓷蜂窝过滤器元件,其中所有水过滤路径穿过多孔通道壁,所述壁具有开放孔隙度,其特征在于中值 孔直径在约2-8微米范围内,直径大于10微米,孔径不大于开孔体积的10%,并且其中过滤元件具有至少0.3ml / min / cm3的底漆水通量 在0.3 psig的水压下。