Abstract:
Disclosed are processes for the preparation of copper containing molecular sieves with the CHA structure having a silica to alumina mole ratio greater than about 10, wherein the copper exchange step is conducted via wet state exchanged and prior to the coating step and wherein in the copper exchange step a liquid copper solution is used wherein the concentration of copper is in the range of about 0.001 to about 0.25 molar using copper acetate and/or an ammoniacal solution of copper ions as copper source. Catalysts made by the processes, catalyst systems and methods of treating exhaust gas with the molecular sieves and catalysts are also disclosed.
Abstract:
Disclosed in certain embodiments are methods of filling storage containers with adsorbent materials (e.g., metal organic framework) and methods to increase the storage capacity of the adsorbent materials. It is an object of certain embodiments to provide containment systems suitable for adsorbed gas storage. It is an object of certain embodiments to provide gas powered machines (e.g.. vehicles, heavy equipment) that utilize the containment systems disclosed herein. It is an object of certain embodiments to provide vehicles and heavy equipment that comprise the containment systems disclosed herein.
Abstract:
Disclosed in certain embodiments are methods of filling storage containers with adsorbent materials (e.g., metal organic framework) and methods to increase the storage capacity of the adsorbent materials. In certain embodiments, the ratio of the tapped density of the particles to the ratio of the freely settled density of the particles is at least 1.1.
Abstract:
Disclosed are processes for the preparation of copper containing molecular sieves with the CHA structure wherein the copper is exchanged into the Na+-form of the Chabazite, using a liquid copper solution wherein the concentration of copper is in the range of about 0.001 to about 0.4 molar. Also described are copper containing molecular sieves with the CHA structure, catalysts incorporating molecular sieves, systems and methods for their use.
Abstract:
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.
Abstract:
A catalyst for the selective catalytic reduction of NOx comprises a zeolitic material which comprises (A) one or more zeolites having a GME framework structure containing YO 2 and X 2O 3, and optionally further comprises one or more zeolites having a CHA framework structure containing YO 2 and X 2O 3, and/or comprises, (B) one or more zeolite intergrowth phases of one or more zeolites having a GME framework structure containing YO 2 and X 2O 3 and one or more zeolites having a CHA framework structure containing YO 2 and X 2O 3,wherein Y is a tetravalent element, and X is a trivalent element, and the zeolitic material contains Cu and/or Fe as non-framework elements in an amount ranging from 0.1 to 15wt.% calculated as the element and based on 100wt.% of YO 2 contained in the zeolitic material. Also provided are a process for its preparation, and a use in a method for the selective catalytic reduction of NOx.
Abstract:
Se describen procesos para la preparación de cobre que contiene tamices moleculares con la estructura de CHA en donde el cobre se intercambia en la forma de Na+ de la Chabazita, usando una solución de cobre líquida en donde la concentración de cobre está en el rango de aproximadamente 0.001 a alrededor de 0.4 molar. También se describen tamices moleculares que contiene cobre con la estructura de CHA, los catalizadores incorporando tamices moleculares, sistemas y métodos para su uso.
Abstract:
a presente invenção refere-se a um material zeolítico contendo cobre e/ ou ferro sintético possuindo uma estrutura de arcabouço cha (cha framework structure), opcionalmente obtenível e/ ou obtido de acordo com o processo de qualquer uma das reivindicações 1 a 15, em que a estrutura de arcabouço cha compreende sio2, x2o3 e, opcionalmente, compreende z2o5, em que x é um elemento trivalente, e z é um elemento pentavalente, em que o material zeolítico contém de 3,8 a 12% em peso de cu e/ ou fe, calculado como o respectivo elemento e com base em 100% em peso de sio2 contido no material zeolítico possuindo uma estrutura de arcabouço cha, e em que a 29si mas nmr do material zeolítico compreende: - um primeiro pico (p1) na faixa de -96 a -98,8 ppm; - um segundo pico (p2) na faixa de -102 a -104,5 ppm; e - um terceiro pico (p3) na faixa de -107,5 a -111 ppm; em que a integração do primeiro, segundo e terceiro picos na 29si mas nmr do material zeolítico oferece uma razão dos valores de integração p1: p2: p3 variando de (0,35 - 0,7): 1: (0,1 - 1,6), bem como a um processo para a preparação do mesmo e ao uso do mesmo, em particular em um método para a redução catalítica seletiva de nox.
Abstract:
A synthetic copper and/or iron containing zeolitic material having a CHA framework structure, wherein the CHA framework structure comprises SiO 2,X 2O 3, and optionally comprises Z 2O 5, wherein X is a trivalent element, and Z is a pentavalent element, wherein the zeolitic material contains from 3.8 to 12 wt.% of Cu and/or Fe calculated as the respective element and based on 100 wt.% of SiO 2 contained in the zeolitic material having a CHA framework structure, and wherein the 29Si MAS NMR of the zeolitic material comprises: a first peak (P1) in the range of from -96 to -98.8 ppm; a second peak (P2) in the range of from -102 to -104.5 ppm; and a third peak (P3) in the range of from -107.5 to -111 ppm; wherein the integration of the first, second, and third peaks in the 29Si MAS NMR of the zeolitic material offers a ratio of the integration values P1:P2:P3 ranging from (0.35-0.7):1: (0.1-1.6), as well as to a process for its preparation, and to the use thereof, in particular in a method for the selective catalytic reduction of NO x.
Abstract:
A process for the preparation of a zeolitic material having a FAU-type framework structure comprising YO2 and X2O3, comprising: (a) preparing a mixture comprising one or more sources of YO2, one or more sources of X2O3, and one or more structure directing agents (SDA); (b) crystallizing the zeolitic material from the mixture obtained in (a); wherein Y is a tetravalent element and X is a bivalent element, and wherein the one or more structure directing agents comprise one or more isomers of diaminomethylcyclohexane. A zeolitic material having an FAU-type framework structure obtained according to the inventive process; processes for preparing a coated substrate and a shaped body, respectively, from the zeolitic material having a FAU-type framework structure obtained according to the inventive process and, a method for selectively reducing nitrogen oxides NOx employing said zeolitic material.