摘要:
A process for the carbonylation of dimethyl ether, dimethyl carbonate and/or methanol with carbon monoxide and hydrogen in the presence of a mordenite catalyst to produce at least one of acetic acid and methyl acetate in which process the mordenite catalyst is regenerated in-situ by contacting the catalyst with a regenerating gas comprising a molecular oxygen-containing gas and an inert diluent at a total pressure in the range 1 to 100 bar and wherein the partial pressure of the molecular oxygen-containing gas is such that the temperature of the catalyst is maintained within the range 225 to 325 °C.
摘要:
Magnetic composites exhibit distinct flux properties due to gradient interfaces. The composites can be used to improve fuel cells and batteries and effect transport and separation of different chemical species. Devices utilizing the composites include a separator, an electrode (804) for channeling flux of magnetic species, an electrode (804) for effecting electrolysis of magnetic species, a system for channeling electrolyte species, a system for separating particles with different magnetic susceptibilities, improved fuel cells, batteries, and oxygen concentrators. Some composites can be used to make a separator for distinguishing between two species of materials and a flux switch to regulate the flow of a chemical species. Some composites can control chemical species transport and distribution. Other composites enable ambient pressure fuel cells having enhanced performance and reduced weight. Some other composites enable rechargeable batteries that have longer secondary cycle life and improved output power. Still other composites, disposed on the surface of electrodes, prevent passivation of those electrodes and enable direct reformation of liqui fuels. Methods involving these composites provide distinct ways for these composites to be utilized.
摘要:
Described is a selective catalytic reduction catalyst comprising a zeolitic framework material of silicon and aluminum atoms, wherein a fraction of the silicon atoms are isomorphously substituted with a tetravalent metal. The catalyst can include a promoter metal such that the catalyst effectively promotes the reaction of ammonia with nitrogen oxides to form nitrogen and H20 selectively over a temperature range of 150 to 650 °C. In another aspect, described is a selective catalytic reduction composite comprising an SCR catalyst material and an ammonia storage material comprising a transition metal having an oxidation state of IV. The SCR catalyst material promotes the reaction of ammonia with nitrogen oxides to form nitrogen and H20 selectively over a temperature range of 150 °C to 600 °C, and the SCR catalyst material is effective to store ammonia at temperatures of 400 °C and above. A method for selectively reducing nitrogen oxides, and a method for simultaneously selectively reducing nitrogen oxide and storing ammonia are also described. Additionally, an exhaust gas treatment system is also described.
摘要:
Described is a selective catalytic reduction catalyst comprising a zeolitic framework material of silicon and aluminum atoms, wherein a fraction of the silicon atoms are isomorphously substituted with a tetravalent metal. The catalyst can include a promoter metal such that the catalyst effectively promotes the reaction of ammonia with nitrogen oxides to form nitrogen and H20 selectively over a temperature range of 150 to 650 °C. In another aspect, described is a selective catalytic reduction composite comprising an SCR catalyst material and an ammonia storage material comprising a transition metal having an oxidation state of IV. The SCR catalyst material promotes the reaction of ammonia with nitrogen oxides to form nitrogen and H20 selectively over a temperature range of 150 °C to 600 °C, and the SCR catalyst material is effective to store ammonia at temperatures of 400 °C and above. A method for selectively reducing nitrogen oxides, and a method for simultaneously selectively reducing nitrogen oxide and storing ammonia are also described. Additionally, an exhaust gas treatment system is also described.
摘要翻译:描述了一种选择性催化还原催化剂,其包含硅和铝原子的沸石骨架材料,其中一部分硅原子被四价金属同晶取代。 催化剂可以包括助催化剂金属,使得催化剂有效地促进氨与氮氧化物的反应,以在150至650℃的温度范围内选择性地形成氮气和H 2 O. 另一方面,描述了选择性催化还原复合物,其包含SCR催化剂材料和包含具有IV氧化态的过渡金属的氨储存材料。 SCR催化剂材料促进氨与氮氧化物的反应以在150℃至600℃的温度范围内选择性地形成氮气和H 2 O,并且SCR催化剂材料在400℃以上的温度下有效地存储氨。 还描述了选择性还原氮氧化物的方法,以及同时选择性还原氮氧化物和储存氨的方法。 另外,还描述了排气处理系统。
摘要:
It is arranged such that a first zeolite loaded with a catalyst metal and a second zeolite unloaded with a catalyst metal are mixed. By actively adsorbing HC onto the second zeolite, it is possible to inhibit the catalyst metal loaded on the first zeolite from being poisoned by HC, and to sufficiently adsorb HC. Accordingly, since the HC adsorbing capability is improved, and since the HC poisoning of the catalyst metal is suppressed, the NO x purifying capability is enhanced and the durability is also upgraded.
摘要:
A catalyst for denitrizing of nitrogen oxides in the presence of a hydrocarbon as a reducing agent, which comprises:
(A) a substituted zeolite having the general formula
M¹ A M² B [(A10₂) x (Si0₂) Y ]·Z H₂0
in which M¹ represents alkali metal, alkaline earth metal or hydrogen ion; M² is at least one metal ion selected from Ti⁴⁺, Zr⁴⁺ and Sn⁴⁺; n₁A +n₂B = X wherein n₁ is a valence of the ion M¹ and n₂ is a valence of ion M²; and Y/Z≧ 5 ; the M² ion being contained in an amount of 0.1-20% by weight based on the zeolite; and either (B) at least one metal or oxide of metal selected from Pd, Pt, Ru, Rh and Ag supported on the substituted zeolite in an amount of 0.1-10% by weight based on the zeolite, or (C) at least one oxide of metal selected from V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Nb, Mo and W in an amount of 0.1-20% by weight based on the zeolite.
摘要:
Hydrocarbon oils, in particular lubricating oils, transformer oils, kerosines or gas oils, are hydrodewaxed over a composite crystalline aluminium silicate as catalyst, which has been prepared from a pyridine-containing base mixture.
摘要:
A method for the regeneration of a zeolite catalyst effective for the carbonylation of methanol or dimethyl ether or dimethyl carbonate with carbon monoxide to produce at least one of acetic acid and methyl acetate wherein said method comprises contacting the zeolite catalyst with a regeneration gas selected from hydrogen or a mixture of hydrogen and carbon monoxide and wherein the catalyst is maintained at a temperature in the range 250 to 600 °C.