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 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: The present invention relates to a process for the preparation of zeolites having CHA framework structure and a composition comprising the molar ratio (n SiO2):X2O3, wherein X is a trivalent element, and wherein n is at least 10, the process comprising (i) preparation of an aqueous solution containing at least one source for X2O3, wherein X is selected from Al, B, Ga, and a mixture of two or more, and at least one source for SiO2, at least one organic structure directing agent (SDA) other than Tetrame-thylammonium hydroxide (TMAOH), acting as a template for the 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 the aqueous solution of (i) contains copper in an amount less than 0.005 Cu:((n YO2)+X2O3) where n is in the range of 10 to 50.

Abstract: Aspects of the present invention relates to a copper containing Levyne molecular sieve having a silica to alumina mole ratio less than 30 and a Cu:Al atomic ratio less than 0.45, wherein the Levyne molecular sieve retains at least 60% of its surface area after exposure to a temperature of from about 750° C. to about 950° C. in the present of up to 10 volume percent water vapor for a time ranging from about 1 to about 48 hours.

Abstract: Described is a copper containing ZSM-34, OFF and/or ERI zeolitic material having a silica to alumina mole ratio ranging from about 4 to about 50 and a copper content, reported as CuO, ranging from about 1 to about 10 wt.-%, based on the total weight of the calcined zeolitic material, and having an alkali metal content, reported as the metal oxide, ranging from about 0.7 to about 1.5 wt.-%, wherein the 750° C.-aged copper containing ZSM-34, OFF and/or ERI zeolitic material exhibits NO conversion at 200° C. of at least about 75% and at 450° C. of at least about 90%, measured at a gas hourly volume based space velocity of 30000 h?1 under steady state conditions at maximum NH3-slip conditions in a gas mixture of 500 ppm NO, 500 ppm NH3, 10% O2, 5% H2O, balance N2.

Abstract: Described is a copper containing ZSM-34, OFF and/or ERI zeolitic material having a silica to alumina mole ratio ranging from about 4 to about 50 and a copper content, reported as CuO, ranging from about 1 to about 10 wt.-%, based on the total weight of the calcined zeolitic material, and having an alkali metal content, reported as metal oxide, ranging from about 1.5 to about 12 wt.-%.

Abstract: Described is a copper containing ZSM-34, OFF and/or ERI zeolitic material having a silica to alumina mole ratio ranging from about 4 to about 50 and a copper content, reported as CuO, ranging from about 1 to about 10 wt.-%, based on the total weight of the calcined zeolitic material, and having an alkali metal content, reported as the metal oxide, of less than about 0.7 wt.-%.

Abstract: Catalysts comprising metal-loaded non-zeolitic molecular sieves having the CHA crystal structure, including Cu-SAPO-34, and methods for treating exhaust gas incorporating such catalysts are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stability at high reaction temperatures.

Abstract: Systems for treating exhaust gas incorporating catalysts comprising metal-loaded non-zeolitic molecular sieves having the CHA crystal structure, including Cu-SAPO-34, and methods for preparing such catalysts are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stability at high reaction temperatures.

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: 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: The present invention is directed to a novel metal-promoted zeolite catalyst, a method of producing the catalyst and a method of using the catalyst for the selective catalytic reduction of NOx with improved hydrothermal durability. The novel metal-promoted zeolite is formed from a low sodium zeolite and is hydrothermally treated after metal ion-exchange.

Abstract: 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 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.

Abstract: A process for the preparation of a copper containing zeolitic material having CHA framework structure and a composition comprising the molar ratio (n YO2):X2O3 wherein X is a trivalent element, preferably Al, Y is a tetravalent element, preferably Si, and wherein n is preferably at least 20, the process comprising the preparation of an phosphor-free aqueous solution containing at least one source for X2O3 and at least one source for YO2, at least one structure directing agent suitable for the preparation of a zeolitic material having CHA framework structure, and at least one Cu source, and the process further comprising the hydrothermal crystallization of said aqueous solution obtaining a suspension containing the copper containing zeolitic material having CHA framework structure.

Abstract: Disclosed are zeolite catalysts having the CHA crystal structure with a low silica to alumina ratio, as well as articles and systems incorporating the catalysts and methods for their preparation and use. The catalysts can be used to reduce NOx from exhaust gas streams, particularly those emanating from gasoline or diesel engines.

Abstract: The present invention relates to a process for the preparation of pure silicoaluminophosphate (SAPO-34) and which contains Cu wherein said molecular sieve material is obtained in a single process stage. This process stage is a hydrothermal crystallization stage to which an aqueous solution is subjected which, apart from source of silica, alumina and phosphorous usually employed framework elements of the zeolite framework, already contains all the Cu necessary for the preparation of the final Cu containing silicoaluminophosphate (SAPO34). In addition, the present invention relates to a pure copper containing molecular sieve material as such, having framework structure SAPO-34, having a molar composition according to formula: Cu0.007-0.125Si0.01-0.25Al0.44-0.54P0.25-0.49O2, having an amount of impurity phase of less than 25% and having a BET surface area of at least 400 m2/g.

Abstract: The present invention is directed to a novel metal-promoted zeolite catalyst, a method of producing the catalyst and a method of sing the catalyst for the selective catalytic reduction of NOx with improved hydrothermal durability. The novel metal-promoted zeolite is formed from a low sodium zeolite and is hydrothermally treated after metal ion-exchange.

Abstract: The present invention is directed to a novel metal-promoted zeolite catalyst, a method of producing the catalyst and a method of using the catalyst for the selective catalytic reduction of NOx with improved hydrothermal durability. The novel metal-promoted zeolite is formed from a low sodium zeolite and is hydrothermally treated after metal ion-exchange.

Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.

Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.