摘要:
Electric arc spraying a metal onto a substrate produces an anchor layer on the substrate that serves as a surprisingly superior intermediate layer for a catalytic material deposited thereon. Spalling of catalytic material is resisted even when subjected to the harsh conditions imposed by small engines or in a close-coupled position for a larger engine.
摘要:
A pearlescent pigment having improved humidity resistance and weatherability is realized by a metal oxide-coated mica pearlescent pigment which has an aluminum or an aluminum-cerium combined with a hydrolyzed silane coupling agent treated surface.
摘要:
A H2-air fuel cell integrated with a steam reformer is disclosed wherein a superheated water/methanol mixture is fed to a catalytic reformer to provide a continuous supply of hydrogen to the fuel cell, the gases exhausted from the anode of the fuel cell providing the thermal energy, via combustion, for superheating the water/methanol mixture.
摘要:
A novel praseodymium-palladium oxide compound has the formula Pr4PdO7. The compound has utility as a catalyst for oxidation of combustion mixtures comprising oxygen (e.g., air) and gaseous carbonaceous fuels such as methane and displays excellent regeneration characteristics after exposure to decomposition-causing temperatures. The compound may be used in a catalyst composition by being coated as a washcoat on a suitable carrier. Catalytic combustion processes are carried out by contacting such combustion mixture with the catalyst under combustion conditions, including catalytically supported thermal combustion. Regeneration of over-temperatured catalyst is also provided for.
摘要:
In one embodiment, the present invention relates to a cement-based composition containing at least one cementitious material and at least one highly reactive pozzolan, wherein the highly reactive pozzolan comprises spray-dried metakaolin. In another embodiment, the present invention relates to a cement-based composition containing at least one cementitious material and at least one highly reactive pozzolan, wherein the highly reactive pozzolan is characterized as comprised of agglomerated beads of microparticles, the agglomerated beads having a median diameter of at least about 10 microns and the microparticles having a median diameter of about 5 microns or less.
摘要:
There is provided a novel terminal bus and retainer for a multicellular converter, particularly a catalytic converter, which converter is characterized by an electrically heatable portion and a light-off portion. The electrically heatable portion includes flat thin metal strips as heater bands and flat thin metal bands not electrically heatable. A terminal bus and retainer is adapted to be connected to a voltage source and to the ends of the heater bands. A portion of the terminal bus and retainer may be used as a connector bus. The terminal bus and retainer also retains the thin metal foil elements in tightly spirally wound condition. These devices are especially useful in catalytic converters for automotive vehicles.
摘要:
In one embodiment, the present invention relates to a method of making vinyl acetate monomer, involving contacting reactant gases with a catalyst comprising palladium, gold and a support in the presence of clean steam, wherein the clean steam is present from about 2 to about 10 psia, with the proviso that the support does not comprise alumina or zinc oxide. In another embodiment, the present invention relates to a method of regenerating a palladium-gold catalyst having an alumina-silica support during a process for making vinyl acetate monomer, involving contacting vinyl acetate monomer reactant gases including oxygen with the palladium-gold catalyst in the presence of clean steam at a temperature from about 100 °C to about 180 °C, wherein the clean steam is present from about 1 to about 8 mole percent of a combination of the vinyl acetate monomer reactant gases and clean steam.