Abstract:
A low cost support useful in chemical reactions and automotive arts is formed by rehydrating a flash calcined gibbsite in an aqueous acidic solution. The rehydrated support can be subsequently stabilized by doping with a stabilizing metal such as lanthanum. The alumina support has excellent thermal stability, high sodium tolerance, high activity with low precious metal loading, and high pore volume and surface area.
Abstract translation:旨在以低成本提供能够在内燃机或主要在过量空气条件下驱动的其它燃烧设备中的废气净化器,从废气中有效地除去氮氧化物。 氮氧化物吸附剂(4)设置在排气通道中,氮氧化物吸附剂(4)由通式LiA x O y的锂复合氧化物或含有锂(Li)的组成元素的LiAxPO 4 S 4组成, 以及选自由锰(Mn),镍(Ni),钴(Co),钒(V),铬(Cr),铁(Fe),钛(Ti),钪 (Sc)和钇(Y)。 例如,氮氧化物吸附剂由锂复合氧化物,如锰酸锂(LiMn 2 O 4 O 4),钛酸锂(Li 2 O 3) (LiMnPO 4)3)或磷酸锂锰(LiMnPO 4)。
Abstract:
The present invention relates to the preparation and activation of multimetallic zeolites loaded with transition metals for N 2 0 abatement in tail-gases from different sources. The N 2 0-containing gas is brought in contact with a catalyst comprising Fe and a second, third, or any additional transition metal (Cu, Co, Ni, Mn, Cr, V), with a total metal content ranging from 0.1-1.0 wt.%, on a zeolite support (MFI or BEA) at 523-873 K. Not 10 only the combination and loading of metals, but also the method of incorporation in the zeolite and its activation is essential to obtain active and stable catalysts. The synergy between metals was observed in Fe-Cu, Fe-Co, and Fe-Co-Cu systems, but not with combinations of iron with other transition metals. The optimal catalysts show high N 2 0 conversions (>80%) at temperatures 2000 hours in pilot-scale tests with a zeolite-coated monolithic reactor.
Abstract:
Particulate sorbent compositions comprising a mixture of zinc oxide, silica, alumina and a substantially reduced valence cobalt are provided for the desulfurization of a feedstream of cracked-gasoline or diesel fuels in a desulfurization zone by a process which comprises the contacting of such feedstreams in a desulfurization zone followed by separation of the resulting low sulfur-containing stream and sulfurized-sorbent and thereafter regenerating and activating the separated sorbent before recycle of same to the desulfurization zone.
Abstract:
Nitrogen oxides contained in exhaust gas from lean-burn engines-mounted internal combustion engines are effectively controlled. An exhaust emission control system and method therefor for controlling nitrogen oxides contained in combustion exhaust gas from internal combustion engines in the presence of a catalyst using reducing gases such as carbon monoxide and hydrogen carbide contained in the exhaust gas, wherein the catalyst used consists of a porous carrier, all of Rh, Pt and Pd, at least selected one of alkali metal and alkali earth metal and Mn or its compound, all formed on the porous carrier.
Abstract:
A copper component and a phosphor component are carried on a catalyst carrier which includes a pentasil-type crystalline aluminosilicate. The catalyst carrier is produced by dipping a carrier in a solution which contains the copper component and the phosphor component or a buffer agent and of which the pH value is adjusted with ammonia, and adding an acid to the solution to adjust the pH value to not higher than 7.0. Thus a catalyst for cleaning exhaust gas having an excellent durability and a high nitrogen oxide removal rate is produced.
Abstract:
The present invention relates to a process for the catalytic reduction of nitrogen oxides contained in exhaust gases from combustions, which process comprises bringing said exhaust gases into contact with a Beta Zeolite exchanged with suitable amounts of cobalt salts, in the presence of a light hydrocarbon as the reducing agent. The present invention relates also to a catalyst for such a process, which catalyst comprises a Beta Zeolite exchanged with cobalt salts, characterized by a Co: zeolite Al molar ratio of
Abstract:
A catalyst and a catalytic method for reducing nitrogen oxides are disclosed. The catalyst consists of an MFI zeolite exchanged with 0.3-2 wt % of palladium on the basis of the overall weight of the catalyst. Said catalyst and method may be used in any selective catalytic nitrogen oxide reduction method, in particular for treating exhaust gases from natural gas powered vehicles.
Abstract:
The present invention relates to the use of a mixed oxide based upon cerium, an element which is Al or Si and a base metal (BM) as to absorb NO x . The invention also relates to a process for the treatment of an exhaust gas using said mixed oxide.