A catalyst, which comprises molecular sieves; a molecular sieve structure is at least provided with a one-dimension eight-membered annular small hole channel, wherein the diameter of a substance that may diffuse in the direction of the eight-membered annular channel is no less than 2.0 , and the diameter of a substance that may be accommodated in the molecular sieves is no more than 6 . The catalyst is used for a methanol- and/or dimethyl ether-to-propylene reaction, comprising causing methanol and/or dimethyl ether to make contact with a methanol-to-propylene catalyst to obtain propylene.

A new family of a microporous crystalline metallophosphate-based materials designated AlPO-75 has been synthesized. These metallophosphate-based materials are represented by the empirical formula
R.sup.p+.sub.rM.sub.w.sup.2+E.sub.xPSi.sub.yO.sub.z
where R is a quaternary ammonium cation such as N,N,N,N-tetramethyl-N,N-p-xyleno-1,6-hexanediammonium, M is a divalent framework metal such as magnesium or zinc, E is a framework element such as aluminum or gallium and the framework may optionally contain silicon. The microporous AlPO-75 compositions are characterized by having the SAO topology and have catalytic properties for carrying out various hydrocarbon conversion processes and separating properties for separating at least one component.

Described are compositions and catalytic articles comprising both a first molecular sieve promoted with copper and a second molecular sieve promoted with iron, the first and second molecular sieves having a d6r unit and the first molecular sieves having cubic shaped crystals with an average crystal size of about 0.5 to about 2 microns. The weight ratio of the copper-promoted molecular sieve to the iron-promoted molecular sieve can be about 1:1 to about 4:1. The catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.

Described are compositions and catalytic articles comprising both a first molecular sieve promoted with copper and a second molecular sieve promoted with iron, the first and second molecular sieves having a d6r unit and the first molecular sieves having cubic shaped crystals with an average crystal size of about 0.5 to about 2 microns. The weight ratio of the copper-promoted molecular sieve to the iron-promoted molecular sieve can be about 1:1 to about 4:1. The catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.

Zeolites, improved methods for their synthesis, and catalysts, systems, and methods of using these zeolites as catalysts are described. The method of synthesis of the zeolites includes forming a mixture including a zeolitic precursor material and a structure directing agent and subjecting the mixture to high shear processing conditions.

Zeolites, improved methods for their synthesis, and catalysts, systems, and methods of using these zeolites as catalysts are described. The method of synthesis of the zeolites includes forming a mixture including a zeolitic precursor material and a structure directing agent and subjecting the mixture to high shear processing conditions.

A method of making and using a new family of crystalline microporous metalloalumino(gallo)phosphosilicate molecular sieves is disclosed. These molecular sieves have been synthesized and are designated high charge density (HCD) MeAPSOs. These metalloalumino(gallo)phosphosilicates are represented by the empirical formula of:
R.sup.p+.sub.rA.sup.+.sub.mM.sup.2+.sub.wE.sub.xPSi.sub.yO.sub.z
where A is an alkali metal such as potassium, R is at least one quaternary ammonium cation such as ethyltrimethylammonium, M is a divalent metal such as Zn and E is a trivalent framework element such as aluminum or gallium. This family of metalloalumino(gallo)phosphosilicate materials is stabilized by combinations of alkali and quaternary ammonium cations, enabling unique, high charge density compositions. The HCD MeAPSO family of materials have catalytic properties for carrying out various hydrocarbon conversion processes and separation properties for separating at least one component.

A method of making and using a new family of crystalline microporous metalloalumino(gallo)phosphosilicate molecular sieves is disclosed. These molecular sieves have been synthesized and are designated high charge density (HCD) MeAPSOs. These metalloalumino(gallo)phosphosilicates are represented by the empirical formula of:
R.sup.p+.sub.rA.sup.+.sub.mM.sup.2+.sub.wE.sub.xPSi.sub.yO.sub.z
where A is an alkali metal such as potassium, R is at least one quaternary ammonium cation such as ethyltrimethylammonium, M is a divalent metal such as Zn and E is a trivalent framework element such as aluminum or gallium. This family of metalloalumino(gallo)phosphosilicate materials is stabilized by combinations of alkali and quaternary ammonium cations, enabling unique, high charge density compositions. The HCD MeAPSO family of materials have catalytic properties for carrying out various hydrocarbon conversion processes and separation properties for separating at least one component.

A new family of highly charged crystalline microporous metallophosphate molecular sieves designated MeAPO-81 has been synthesized. These metallophosphates are represented by the empirical formula of:
R.sup.p+.sub.rA.sup.+.sub.mM.sup.2+.sub.xE.sub.yPO.sub.z
where A is an alkali metal such as potassium, R is at least one quaternary ammonium cation of which one must be a cyclic diquaternary organoammonium cation such as N,N,N,N-tetramethyl-N,N-butano-1,6-hexanediammonium, M is a divalent metal such as zinc and E is a trivalent framework element such as aluminum or gallium. The MeAPO-81 family of materials has the BPH topology. The MeAPO-81 family of materials is among the first MeAPO-type molecular sieves to be stabilized by combinations of alkali and organoammonium cations, enabling unique high charge density compositions. The MeAPO-81 family of molecular sieves has catalytic properties for carrying out various hydrocarbon conversion processes and separation properties for separating at least one component.

A new family of highly charged crystalline microporous metallophosphate molecular sieves designated MeAPO-81 has been synthesized. These metallophosphates are represented by the empirical formula of:
R.sup.p+.sub.rA.sup.+.sub.mM.sup.2+.sub.xE.sub.yPO.sub.z
where A is an alkali metal such as potassium, R is at least one quaternary ammonium cation of which one must be a cyclic diquaternary organoammonium cation such as N,N,N,N-tetramethyl-N,N-butano-1,6-hexanediammonium, M is a divalent metal such as zinc and E is a trivalent framework element such as aluminum or gallium. The MeAPO-81 family of materials has the BPH topology. The MeAPO-81 family of materials is among the first MeAPO-type molecular sieves to be stabilized by combinations of alkali and organoammonium cations, enabling unique high charge density compositions. The MeAPO-81 family of molecular sieves has catalytic properties for carrying out various hydrocarbon conversion processes and separation properties for separating at least one component.