摘要:
A selective catalytic reduction (SCR) process with a palladium catalyst for reducing NOx in a gas, using hydrogen as a reducing agent is provided. The process comprises contacting the gas stream with a catalyst system, the catalyst system comprising (ZrO2)SO4, palladium, and a pre-sulfated zirconia binder. The inclusion of a pre-sulfated zirconia binder substantially increases the durability of a Pd-based SCR catalyst system. A system for implementing the disclosed process is further provided.
摘要:
A selective catalytic reduction (SCR) process with a palladium catalyst for reducing NOx in a gas, using hydrogen as a reducing agent is provided. The process comprises contacting the gas stream with a catalyst system, the catalyst system comprising (ZrO2)SO4, palladium, and a pre-sulfated zirconia binder. The inclusion of a pre-sulfated zirconia binder substantially increases the durability of a Pd-based SCR catalyst system. A system for implementing the disclosed process is further provided.
摘要:
The invention provides reactive sorbents and methods of making and using the same in order to decontaminate surfaces contaminated with toxic agents, such as chemical warfare agents and/or industrial toxins. The reactive sorbents are of two general types, one of which comprises dehydroxylated aluminum oxide and the other comprises porous carbon impregnated with a reactive solution, so that both sorbents take up and then detoxify toxic agents.
摘要:
A process for reducing perfluorinated compounds and/or hydrofluorocarbon compounds in a sample uses a catalyst made from aluminum oxide (Al2O3), and one or more enhancers selected from the group consisting of nickel, cobalt, and sulfate. Another useful catalyst comprises zirconium oxide (ZrO2) and/or aluminum oxide (Al2O3) and nickel as an enhancer.
摘要翻译:用于还原全氟化合物和/或氢氟烃化合物的方法使用由氧化铝(Al 2 O 3)制成的催化剂和一种或多种选自镍,钴和硫酸盐的增强剂。 另一种有用的催化剂包括氧化锆(ZrO 2)和/或氧化铝(Al 2 O 3)和镍作为增强剂。
摘要:
A process and composition for transforming perfluoroalkanes in the presence of an oxidizing agent and water at temperatures between about 400 to 1,000° C. Aluminum oxide is the primary agent for effecting this transformation. Additions of between 0.1 to 50% by weight of other components such as barium calcium, phosphorus, cerium, chromium, cobalt, iron, lanthanum, magnesium, nickel, silicon, titanium, yttrium or zirconium aid in extending the useful life of the catalyst. A preferred catalyst composition includes aluminum oxide with additions of cobalt and one or more of the elements of cerium, titanium or zirconium.
摘要:
The present invention relates to a novel filtration media and process for removing toxic materials from streams of air at ambient conditions using the novel filtration media. The filtration media is comprised of porous zirconium hydroxide onto which at least one reactive moiety is impregnated.
摘要:
A method for oxidizing an amount of CO in a CO-containing gas stream, e.g., a combustion stream from fuel combustion, is provided. The method comprises exposing the CO-containing gas stream to a catalytic coating at reaction conditions, including at least 8 vol. % O2 and a temperature of at least 600° C. At these reaction conditions, the method comprises generating gaseous intermediate oxidizing species at the catalytic coating for oxidation of the carbon monoxide within the CO-containing gas stream as a homogeneous reaction to improve CO removal efficiency.
摘要:
A process for removing epoxides from a process stream over a wide range of temperature and relative humidity, comprising the step of contacting the process stream with a filtration media comprising an acid form of a mesoporous zeolite produced from pentasil zeolite treated with a caustic agent, for a sufficient time to remove the epoxides therefrom.
摘要:
A process for removal of ethylene oxide (EO) from ambient air laden with EO is passed through a zeolite-based removal media, which preferrably consists of the acid form of zeolite ZSM-5, herein referred to as “H-ZSM-5.” The process described herein may be applied to many forms, configurations and uses, such as, for example, gas masks, fume hood ventilation filters, cartridge filters, etc. Preferably, the H-ZSM-5 is configured within an apparatus in such a manner that the stream containing EO is brought into sufficient contact with the zeolite to remove the EO from the airstream.
摘要:
The present invention relates to a catalytic process for the destruction of PFC's and HFC's using a catalyst which comprises aluminum oxide that has preferably been stabilized through the addition of a stabilizing agent (such as, titanium, zirconium, or cobalt, or mixtures of these elements). The addition of these elements to the aluminum oxide unexpectedly enhances the catalyst's stability without significantly altering its reactivity. The total amount of stabilizing agent added to the catalyst can be as low as 0.005 parts (by weight) stabilizing agent per part (by weight) aluminum oxide (Al2O3) or as great as 2 or more parts (by weight) stabilizing agent per part (by weight) aluminum oxide; so long as there is sufficient aluminum oxide available to effectively catalyze the destruction of the target PFC's and/or HFC's. An oxidizing agent, such as, for example, platinum, palladium, rhodium, iridium, silver, nickel, copper, iron, vanadium, and/or cerium, may be added to the catalyst to effectively convert any carbon monoxide to carbon dioxide.
摘要翻译:本发明涉及使用催化剂破坏PFC和HFC的催化方法,所述催化剂包括优选通过加入稳定剂(例如钛,锆或钴或这些元素的混合物)来稳定的氧化铝 )。 将这些元素添加到氧化铝中意外地提高了催化剂的稳定性,而没有显着改变其反应性。 添加到催化剂中的稳定剂的总量可以低至0.005份(重量)稳定剂,每份(重量)氧化铝(Al 2 O 3)或大于2份或更多份(重量)稳定剂每份 (重量比)氧化铝; 只要有足够的氧化铝可以有效地催化目标PFC和/或HFC的破坏。 可以向催化剂中加入氧化剂,例如铂,钯,铑,铱,银,镍,铜,铁,钒和/或铈,以有效地将任何一氧化碳转化为二氧化碳。