An object of the present invention is to provide a chabazite zeolite which does not easily peel from a substrate such as a honeycomb body even when the substrate has been coated therewith, while exhibiting excellent durability. The present invention relates to a chabazite zeolite for substrate coating, which includes (i) to (iv) below. (i) Si and Al are contained, (ii) an SiO.sub.2/Al.sub.2O.sub.3 molar ratio is in a range of 5<SiO.sub.2/Al.sub.2O.sub.3<10, (iii) an average crystal size is in a range of 0.05 m<average crystal size<1 m, and (iv) in a spectrum measured by .sup.27Al-NMR, a ratio (A.sub.NFA/A.sub.Total) between an area (A.sub.Total) of all peaks in the spectrum and an area (A.sub.NFA) of peaks assigned to Al other than tetracoordinated Al is in a range of 20%(A.sub.NFA/A.sub.Total)70%.

An object of the present invention is to provide a chabazite zeolite which does not easily peel from a substrate such as a honeycomb body even when the substrate has been coated therewith, while exhibiting excellent durability. The present invention relates to a chabazite zeolite for substrate coating, which includes (i) to (iv) below. (i) Si and Al are contained, (ii) an SiO.sub.2/Al.sub.2O.sub.3 molar ratio is in a range of 5<SiO.sub.2/Al.sub.2O.sub.3<10, (iii) an average crystal size is in a range of 0.05 m<average crystal size<1 m, and (iv) in a spectrum measured by .sup.27Al-NMR, a ratio (A.sub.NFA/A.sub.Total) between an area (A.sub.Total) of all peaks in the spectrum and an area (A.sub.NFA) of peaks assigned to Al other than tetracoordinated Al is in a range of 20%(A.sub.NFA/A.sub.Total)70%.

A copper-CHA zeolite catalyst for SCR of NO.sub.x is disclosed.

A dehydration method is a dehydration method for selectively separating water from a mixture that contains water, using a zeolite membrane having an AFX structure, and the method includes a step of supplying the mixture to a supply side space of the zeolite membrane having an AFX structure, and a step of making a pressure difference between the supply side space and a permeation side space of the zeolite membrane having an AFX structure.

The invention provides methods and compositions for precursors and for the synthesis of zeolites. The invention makes use of intimately homogeneous precursors which avoid the formation of a difficult to work with gel stage in zeolite formation. This allows for the synthesis of zeolite in a much shorter period of time and with much lower amounts of structure directing agents.

The invention provides methods and compositions for precursors and for the synthesis of zeolites. The invention makes use of intimately homogeneous precursors which avoid the formation of a difficult to work with gel stage in zeolite formation. This allows for the synthesis of zeolite in a much shorter period of time and with much lower amounts of structure directing agents.

Design, fabrication, and usage of a reactor are presented for synthesis of structured materials from a liquid-phase precursor by heating. The structured materials are particles, membranes or films of micro-porous molecular sieve crystals such as zeolite and meso-porous materials. The precursor solution and structured materials in the reactor are uniformly heated by a planar heater with characteristic heat transfer dimension in the range of 3 mm to 10 cm. A planar heater having width and length at least three times of the characteristic heat transfer dimension provides at least one surface of uniform temperature distribution for heating purposes. Heating is conducted over a temperature range of 20 to 300 C. The planar heater can be heated by electrical power of by thermal fluid.

Design, fabrication, and usage of a reactor are presented for synthesis of structured materials from a liquid-phase precursor by heating. The structured materials are particles, membranes or films of micro-porous molecular sieve crystals such as zeolite and meso-porous materials. The precursor solution and structured materials in the reactor are uniformly heated by a planar heater with characteristic heat transfer dimension in the range of 3 mm to 10 cm. A planar heater having width and length at least three times of the characteristic heat transfer dimension provides at least one surface of uniform temperature distribution for heating purposes. Heating is conducted over a temperature range of 20 to 300 C. The planar heater can be heated by electrical power of by thermal fluid.

A CON zeolite satisfying the following (1) to (2): (1) The framework is CON as per the code specified by the International Zeolite Association (IZA); and (2) It contains silicon and aluminum, and the molar ratio of aluminum to silicon is 0.04 or more.

Methods of forming mesoporous zeolites with tunable pore widths are provided. In some embodiments, the method includes mixing a silicon-containing material, an aluminum-containing material, and at least a quaternary amine to produce a zeolite precursor solution. The zeolite precursor solution is pre-crystallized at a pre-crystallization temperature of greater than 125 C. and autogenous pressure to form a pre-crystallized zeolite precursor solution and combined with an organosilane mesopore template to produce a zeolite precursor gel. The zeolite precursor gel is crystallized without a previous discrete functionalization step to produce a crystalline zeolite intermediate and the crystalline zeolite intermediate is calcined to produce the mesoporous zeolite. An organosilane mesopore template in accordance with

##STR00001##

is also provided, where R is an aliphatic, aromatic, or heteroatom-containing group.