摘要:
Catalyst composition for selective reduction of nitrogen oxides and soot oxidation comprising a physical mixture of one or more acidic zeolite or zeotype components with one ore more redox active metal compounds and a method for selective reduction of nitrogen oxides and soot oxidation by use of the catalyst composition.
摘要:
An ultra-violet (UV) protection layer is formed over a semiconductor workpiece before depositing a UV curable dielectric layer. The UV protection layer prevents UV light from reaching and damaging underlying material layers and electrical devices. The UV protection layer comprises a layer of silicon doped with an impurity, wherein the impurity comprises O, C, H, N, or combinations thereof. The UV protection layer may comprise SiOC:H, SiON, SiN, SiCO:H, combinations thereof, or multiple layers thereof, as examples.
摘要:
SCR-active molecular sieve based-catalysts are produced by combining a molecular sieve with at least one ionic iron species and at least one organic compound to form a mixture, then calcining the mixture to remove the at least one organic compound. This process improves the dispersion of the iron within the molecular sieve compared to an iron-containing molecular sieve that is not treated with an organic compound. Iron-containing ferrierite zeolites exhibit a selective catalytic reduction of nitrogen oxides with NH3 or urea of greater than 25% conversion at 300° C. in exhaust gases prior to ageing or exposure to steam. Iron-containing beta zeolites exhibit a selective catalytic reduction of nitrogen oxides with NH3 or urea of: (a) greater than 40% conversion at 300° C. and (b) greater than 80% conversion at 400° C., in exhaust gases after ageing for 20 hours at 700° C. in the presence of 10% H2O.
摘要:
In a method for manufacturing a zeolite, a raw material composition containing a Si source, an Al source, an alkali source, and a structure directing agent is reacted to synthesize the zeolite including a CHA-structured aluminosilicate. The Al source includes a dried aluminum hydroxide gel.
摘要:
Provided is a catalyst composition having an aluminosilicate molecular sieve having an AEI structure and a mole ratio of silica-to-alumina of about 20 to about 30 loaded with about 1 to about 5 weight percent of a promoter metal, based on the total weight of the molecular sieve material. Also provided are method, articles, and systems utilizing the catalyst composition.
摘要:
A catalyst composition includes a heterobimetallic zeolite characterized by a chabazite structure loaded with copper ions and at least one trivalent metal ion other than Al3+. The catalyst composition decreases NOx emissions in diesel exhaust and is suitable for operation in a catalytic converter.
摘要:
A honeycomb catalyst includes a honeycomb unit. The honeycomb unit has a plurality of through holes that are arranged in parallel in a longitudinal direction and partitions that are provided between the plurality of through holes. The honeycomb unit includes a first zeolite, a second zeolite, and an inorganic binder. The first zeolite includes a CHA-structured aluminosilicate having a Si/Al ratio of about 15 to about 50. The second zeolite includes a silicoaluminophosphate having a Si/(Si+Al+P) ratio of about 0.1 to about 0.25. A volume ratio of the first zeolite to the second zeolite is about 75:about 25 to about 90:about 10.
摘要:
Provided is a metal promoted, low SAR zeolite-based SCR catalyst having at least about 1.35 weight percent of cerium, based on the total weight of the zeolite, wherein said cerium is present in a form selected from exchanged cerium ions, monomeric ceria, oligomeric ceria, and combinations thereof, provided that said oligomeric ceria has a particle size of less than 5 μm, the catalyst having superior durability after hydrothermal aging.
摘要:
Catalyst composition for selective reduction of nitrogen oxides and soot oxidation comprising a physical mixture of one or more acidic zeolite or zeo-type components with one ore more redox active metal compounds and a method for selective reduction of nitrogen oxides and soot oxidation by use of the catalyst composition.
摘要:
A method of coating a honeycomb monolith substrate comprising a plurality of channels with a liquid comprising a catalyst component comprises the steps of: (i) holding a honeycomb monolith substrate substantially vertically; (ii) introducing a pre-determined volume of the liquid into the substrate via open ends of the channels at a lower end of the substrate; (iii) sealingly retaining the introduced liquid within the substrate; (iv) inverting the substrate containing the retained liquid; and (v) applying a vacuum to open ends of the channels of the substrate at the inverted, lower end of the substrate to draw the liquid along the channels of the substrate.