One form of the present disclosure provides a catalyst including: an LTA zeolite containing copper ions; and an additive, wherein a Si/Al molar ratio of the LTA zeolite is in a range of approximately 2 to 50.

The present invention concerns zeolites with hierarchical porosity having a molar ratio Si/Al of between 1 and 1.4, inclusive, of which the average diameter, as a number, is between 0.1 ?m and 20 ?m, having controlled and optimized crystallinity, and having mesoporosity such that the mesoporous outer surface area is between 40 m.sup.2.Math.g.sup.?1 and 400 m.sup.2.Math.g.sup.?1. The present invention also concerns the method for preparing said zeolites with hierarchical porosity.

The invention relates to a catalyst system for oligomerizing olefins over a catalyst comprising nickel, to the use of this catalyst and to a method for dimerizing olefins.

A device for purifying exhaust gas may be provided to purify exhaust gas in an engine includes an exhaust line through which exhaust gas discharged from the engine passes, a diesel oxidation catalyst (DOC) that is disposed in the exhaust line to purify hydrocarbon (HC) and carbon monoxide (CO) of the exhaust gas, a urea injector that injects a urea aqueous solution into the exhaust line, and a selective catalyst reduction (SCR) that reduces nitrogen oxide of the exhaust gas passing through the DOC by use of the urea aqueous solution, in which the DOC includes an LTA zeolite catalyst.

The present disclosure is directed to processing for preparing crystalline pure-silica and heteroatom-substituted LTA frameworks in fluoride media using a simple organic structure-directing agent (OSDA), having a structure of Formula (I):

##STR00001##

where substituents R.sup.1 to R.sup.9 are defined herein. Aluminosilicate LTA is an active catalyst for the methanol to olefins reaction with higher product selectivities to butenes as well as C5 and C6 products than the commercialized catalysts. Titanosilicate LTA is an active catalyst for the epoxidation of allyl alcohol using aqueous H.sub.2O.sub.2.

A method for preparing molecular sieves with a Linde Type A (LTA) topology structure, and molecular sieves obtained thereby are described wherein a structure directing agent comprising a triquaternary cation is contacted with a source of a first oxide of a first tetravalent element or a source of a first oxide of a trivalent element; and a source of an oxide of a pentavalent elements.

There is provided a method for producing a zeolite more excellent in moisture absorption characteristics. The method includes physically pulverizing a zeolite that has a gradient of a Na/Si value from a surface of the zeolite in a depth direction, that has a proportion of the Na/Si value at a depth of 10 nm from the surface to the Na/Si value at the surface of 90% or more, and that has a proportion of the Na/Si value at a depth of 30 nm from the surface to the Na/Si value at the surface of 70% or more, the Na/Si value representing a composition ratio between Na and Si, and crystallizing the physically pulverized zeolite.

There is provided a method for producing a zeolite more excellent in moisture absorption characteristics. The method includes physically pulverizing a zeolite that has a gradient of a Na/Si value from a surface of the zeolite in a depth direction, that has a proportion of the Na/Si value at a depth of 10 nm from the surface to the Na/Si value at the surface of 90% or more, and that has a proportion of the Na/Si value at a depth of 30 nm from the surface to the Na/Si value at the surface of 70% or more, the Na/Si value representing a composition ratio between Na and Si, and crystallizing the physically pulverized zeolite.

The present invention relates to a zeolite type A, a method for preparing the zeolite type A, use of the zeolite type A for separating carbon dioxide from a composition comprising hydrocarbons, and a process for separating carbon dioxide from a gas composition using the zeolite type A. The zeolite type A comprising, based on total amount of exchangeable ions, less than 10% of potassium ions, less than about 10% of a second group of ions consisting of cesium ions, rubidium ions and mixtures thereof, and from about 80% up to about 90% of a third group of ions consisting of sodium ions, lithium ions and mixtures thereof

The present invention relates to a zeolite type A, a method for preparing the zeolite type A, use of the zeolite type A for separating carbon dioxide from a composition comprising hydrocarbons, and a process for separating carbon dioxide from a gas composition using the zeolite type A. The zeolite type A comprising, based on total amount of exchangeable ions, less than 10% of potassium ions, less than about 10% of a second group of ions consisting of cesium ions, rubidium ions and mixtures thereof, and from about 80% up to about 90% of a third group of ions consisting of sodium ions, lithium ions and mixtures thereof