摘要:
A catalyst for the oxidation of volatile organic compounds and carbon monoxide comprising manganese and alumina, such catalyst having been impregnated with a phosphorus compound. The presence of the phosphorus compound results in a significant oxidative conversion of both the volatile organic compounds and the carbon monoxide. The catalyst is especially useful for treating gaseous streams that emanate from industrial sources, such as wood pulp manufacturing plants. The manganese portion of the catalyst is preferably comprised of manganese compounds comprising a defect non-stoichiometric manganese oxide of the type β-Mn3O4+x, wherein x has the value of 0.1≦x≦0.25 in respect to about 80 to about 95% of all manganese atoms, and manganese aluminate in respect to the balance of the manganese atoms. The alumina portion of the catalyst is preferably comprised of high temperature forms of alumina of the type comprising α-Al2O3 and (α+δ+θ)-Al2O3.
摘要翻译:用于氧化包含锰和氧化铝的挥发性有机化合物和一氧化碳的催化剂,这种催化剂已经用磷化合物浸渍。 磷化合物的存在导致挥发性有机化合物和一氧化碳的显着氧化转化。 催化剂特别适用于处理从工业来源产生的气流,如木浆制造厂。 催化剂的锰部分优选包含锰化合物,其包含类型为β-Mn 3 O 4 + x N的缺陷非化学计量的氧化锰,其中x具有 相对于锰原子的平衡,相对于约80至约95%的所有锰原子,0.1 <= x <= 0.25的值和铝酸锰。 催化剂的氧化铝部分优选由包含α-Al 2 O 3 3和(α+δ+θ)3 Al 3+的类型的高温形式的氧化铝组成, SUB> 2 O> 3。
摘要:
The present invention is directed to a method for removal by oxidation of the excess ammonia (NH3) gas (“ammonia slip”) resulting from flue gases that have been subjected to selective catalytic reduction (SCR) for reduction of nitrogen oxides (NOx) with ammonia. More specifically, the inventive method uses an ammonia oxidation catalyst consisting of a zeolite, one or more precious metals, and a base metal compound, to catalyze the oxidation of both ammonia and carbon monoxide (CO), while minimizing the formation of nitrogen oxides (NOx). The present invention is useful in treating flue and exhaust gases.
摘要:
Catalysts, catalyst systems, and methods for removing ammonia and/or carbon monoxide in flue gases are provided where ammonia is used with a selective catalytic reduction catalyst for reducing oxides of nitrogen. An oxidation catalyst is utilized, which comprises particulate platinum or platinum/palladium dispersed on zirconia particles, the particulate platinum or platinum/palladium having an average particle size less than about 10 nm. The catalyst is effective to convert less than 20% of NO to NO2 passing through the oxidation catalyst.
摘要:
The present invention is directed to a method for removal by oxidation of the excess ammonia (NH3) gas (“ammonia slip”) resulting from flue gases that have been subjected to selective catalytic reduction (SCR) for reduction of nitrogen oxides (NOx) with ammonia. More specifically, the inventive method uses an ammonia oxidation catalyst consisting of a zeolite, one or more precious metals, and a base metal compound, to catalyze the oxidation of both ammonia and carbon monoxide (CO), while minimizing the formation of nitrogen oxides (NOx). The present invention is useful in treating flue and exhaust gases.
摘要:
Catalyst articles comprising palladium and related methods of preparation and use are disclosed. Disclosed is a catalyst article comprising a first catalytic layer formed on a substrate, wherein the first catalytic layer comprises palladium impregnated on a ceria-free oxygen storage component and platinum impregnated on a refractory metal oxide, and a second catalytic layer formed on the first catalytic layer comprising platinum impregnated on an oxygen storage component and rhodium impregnated on a zirconia-coated or yttria-coated alumina. The palladium component of the catalyst article is present in a higher proportion relative to the other platinum group metal components. The catalyst articles provide improved reductions in NOx in exhaust gases, particularly after lean-rich aging.
摘要:
A process is described that removes by oxidation the excess ammonia (NH3) gas from flue gases that have been subjected to selective catalytic reduction (SCR) of oxides of nitrogen (NOx) by ammonia injection. The inventive process incorporates a secondary catalyst of precious metal and vanadia on a metal oxide such as titania to catalyze the oxidation of both ammonia and carbon monoxide (CO) while maintaining sulfur dioxide (SO2) levels.
摘要翻译:描述了一种通过氧化除去已经经过氮氧化物的选择性催化还原(SCR)的烟道气中的过量氨(NH 3)气体的方法(NO sub> >)。 本发明方法在金属氧化物如二氧化钛上引入贵金属和氧钒的二次催化剂,以催化氨和一氧化碳(CO)的氧化同时保持二氧化硫(SO 2 H 2)水平。