摘要:
The present invention relates to a mixed metal oxide catalyst in which a hydrotalcite precursor containing an alkali metal is impregnated or intercalated with a nonprecious metal, a method of manufacturing the same, and a method of decomposing nitrogen oxide using the mixed metal oxide catalyst. The mixed metal oxide catalyst has excellent catalytic activity because it can decompose NOx, N2O or a mixture thereof even at low temperature, and is economical because it does not use a precious metal.
摘要:
An exhaust purifying catalyst includes: a substrate; a first-stage catalyst that includes an oxygen storage capacity (OSC) material and that is provided on the substrate on an upstream side thereof in an exhaust gas flow direction; and a second-stage catalyst that includes an OSC material and that is provided on the substrate on a downstream side thereof in an exhaust gas flow direction. The OSC material included in the first-stage catalyst and the second-stage catalyst includes OSC material on which a noble metal is not supported. The proportion of the amount of the OSC material, on which a noble metal is not supported, and that is included in the second-stage catalyst with respect to the combined amount of the OSC material, on which a noble metal is not supported, and that is included in the first-stage catalyst and the second-stage catalyst is in a range of from 0 to 50 wt %.
摘要:
A process is disclosed for the removal of nitrous oxide from a gas stream having a contaminating concentration of nitrous oxide to provide a gas stream with a significantly reduced concentration of nitrous oxide. The process includes passing the feed gas stream through a first heat transfer zone that is in heat exchange relationship with a product stream whereby heat is transferred from the product stream to the feed gas stream to thereby provide a heated gas stream; passing said heated gas stream to a reaction zone containing a N2O decomposition catalyst and optionally a combination of other catalyst that provides for the decomposition of nitrous oxide or other contaminants and yielding therefrom a product stream having a reduced concentration of nitrous oxide; and passing the product stream to the first heat transfer zone to provide a cooled product stream.
摘要:
An exhaust purifying catalyst includes: a substrate; a first-stage catalyst that includes an oxygen storage capacity (OSC) material and that is provided on the substrate on an upstream side thereof in an exhaust gas flow direction; and a second-stage catalyst that includes an OSC material and that is provided on the substrate on a downstream side thereof in an exhaust gas flow direction. The OSC material included in the first-stage catalyst and the second-stage catalyst includes OSC material on which a noble metal is not supported. The proportion of the amount of the OSC material, on which a noble metal is not supported, and that is included in the second-stage catalyst with respect to the combined amount of the OSC material, on which a noble metal is not supported, and that is included in the first-stage catalyst and the second-stage catalyst is in a range of from 0 to 50 wt %.
摘要:
The present invention relates to a process for the preparation of zeolites having B-CHA framework structure and a composition comprising the molar ratio (n SiO2):B2O3, wherein n is at least 10, the process comprising (i) preparation of an aqueous solution containing at least one source for B2O3, at least one source for SiO2, at least one source of seeding crystals of chabazite structure, at least one organic structure directing agent (SDA) other than Tetramethylammonium hydroxide (TMAOH), acting as a template for the B-CHA structure, and Tetramethylammonium hydroxide (TMAOH), wherein the SDA or mixtures thereof are employed in such amounts that the aqueous solution in (i) exhibits a molar ratio of SDA:TMAOH of 0.01 to 5; (ii) hydrothermal crystallization of the aqueous solution according to (i); wherein B-CHA is essentially free of alkali metal and/or alkaline earth metal and the ratio of the [molar ratio (SiO2:B2O3)] of the gel composition:[molar ratio (SiO2:B2O3)] of the crystalline product having the chabazite structure is greater than 0.5.
摘要翻译:本发明涉及一种制备具有B-CHA骨架结构的沸石和包含摩尔比(n SiO 2):B 2 O 3,其中n至少为10的组合物的方法,该方法包括(i)制备水溶液 含有至少一种B 2 O 3源,至少一种SiO 2源,至少一种菱沸石结晶晶体源,至少一种除氢氧化四甲基铵(TMAOH)以外的有机结构导向剂(SDA),作为 B-CHA结构和四甲基氢氧化铵(TMAOH),其中SDA或其混合物的用量使得(i)中的水溶液的SDA:TMAOH的摩尔比为0.01至5; (ii)根据(i)的水溶液的水热结晶; 其中B-CHA基本上不含碱金属和/或碱土金属,并且具有凝胶组成的[摩尔比(SiO 2 :B 2 O 3)]与[ 菱沸石结构大于0.5。
摘要:
Disclosed is a catalyst composition for reducing NOx through two steps including reacting NOx with H2 thus producing ammonia which is then reacted with NOx, instead of direct NOx reduction by H2, and a method of reducing NOx using the catalyst composition.
摘要:
The present invention relates to a catalyst comprising 0.1-10 mol % CO3-xMxO4, where M is Fe or Al and x=0-2, on a cerium oxide support for decomposition of N2O in gases containing NO. The catalyst may also contain 0.01-2 weight % ZrO2. The invention further comprises a method for performing a process comprising formation of N2O. The N2O containing gas is brought in contact with a catalyst comprising 0.1-10 mol % CO3-xMxO4, where M is Fe or Al and x=0-2, on a cerium oxide support, at 250-1000° C. The method may comprise that ammonia is oxidized in presence of an oxidation catalyst and that the thereby formed gas mixture is brought in contact with the catalyst comprising the cobalt component on cerium oxide support at a temperature of 500-1000° C.
摘要翻译:本发明涉及一种催化剂,其包含0.1-10摩尔%的CO 3-x M x O 4,其中M是Fe或Al,x = 0-2,用于在含NO的气体中分解N 2 O的氧化铈载体上。 催化剂还可以含有0.01-2重量%的ZrO 2。 本发明还包括一种用于执行包括形成N 2 O的方法。 使含N2O的气体在氧化铈载体上在250-1000℃下与包含0.1-10mol%CO 3-xM x O 4的催化剂接触,其中M为Fe或Al,x = 0-2。 包括在氧化催化剂的存在下氨被氧化,并且由此形成的气体混合物在500-1000℃的温度下与包含钴组分的催化剂在氧化铈载体上接触。
摘要:
The present invention relates to a catalyst comprising 0.1-10 mol % Co3-xMxO4, where M is Fe or Al and x=0-2, on a cerium oxide support for decomposition of N2O in gases containing NO. The catalyst may also contain 0.01-2 weight % ZrO2. The invention further comprises a method for performing a process comprising formation of N2O. The N2O containing gas is brought in contact with a catalyst comprising 0.1-10 mol % CO3-xMxO4, where M is Fe or Al and x=0-2, on a cerium oxide support, at 250-1000° C. The method may comprise that ammonia is oxidized in presence of an oxidation catalyst and that the thereby formed gas mixture is brought in contact with the catalyst comprising the cobalt component on cerium oxide support at a temperature of 500-1000° C.
摘要翻译:本发明涉及一种催化剂,其包含0.1-10摩尔%的Co 3-x M x O 4,其中M是Fe或Al,x = 0-2,用于在含NO的气体中分解N 2 O的氧化铈载体上。 催化剂还可以含有0.01-2重量%的ZrO 2。 本发明还包括一种用于执行包括形成N 2 O的方法。 使含N2O的气体在氧化铈载体上在250-1000℃下与包含0.1-10mol%CO 3-xM x O 4的催化剂接触,其中M为Fe或Al,x = 0-2。 包括在氧化催化剂的存在下氨被氧化,并且由此形成的气体混合物在500-1000℃的温度下与包含钴组分的催化剂在氧化铈载体上接触。
摘要:
The present invention relates to a catalyst comprising 0.1-10 mol % Co3-xMxO4, where M is Fe or Al and xnull0-2, on a cerium oxide support for decomposition of N2O in gases containing NO. The catalyst may also contain 0.01-2 weight % ZrO2. The invention further comprises a method for performing a process comprising formation of N2O. The N2O containing gas is brought in contact with a catalyst comprising 0.1-10 mol % C03-xMxO4, where M is Fe or Al and xnull0-2, on a cerium oxide support, at 250-1000null C. The method may comprise that ammonia is oxidized in presence of an oxidation catalyst and that the thereby formed gas mixture is brought in contact with the catalyst comprising the cobalt component on cerium oxide support at a temperature of 500-1000null C.