The present invention relates to new crystalline zeolite SSZ-52x prepared using a quaternary ammonium cation templating agent, for example, having the structure: ##STR00001## wherein X.sup. is an anion which is not detrimental to the formation of the SSZ-52x. SSZ-52x is useful as a catalyst and shows improved durability, particularly with regard to NO.sub.x conversion.

Prepare a hybrid SAPO-34/ZSM-5 catalyst via sequential steps as follows: a) form a mixture consisting essentially of ZSM-5 as a sole source of silicon atoms, aluminum isopropoxide and a solution of orthophosphoric acid; b) combine the mixture with an aqueous solution of tetraethylammonium hydroxide to form a reaction mixture; and c) subject the reaction mixture to hydrothermal conditions for a period of time sufficient to convert the reaction mixture to a hybrid SAPO-34/ZSM-5 catalyst. Use the hybrid catalyst in converting an oxygenate (methanol and/or dimethyl ether) to an olefin.

The present invention relates to new crystalline zeolite SSZ-52x prepared using a quaternary ammonium cation templating agent, for example, having the structure:

##STR00001##

wherein X.sup.? is an anion which is not detrimental to the formation of the SSZ-52x. SSZ-52x is useful as a catalyst and shows improved durability, particularly with regard to NO.sub.x conversion.

Disclosed are methods of synthesizing a hierarchically porous aluminosilicate materials. Methods for synthesizing a hierarchically porous aluminosilicate material can comprise (i) combining, in aqueous solution, a base, an aluminum source, and silicon source to form a precursor gel; (ii) removing water from the precursor gel to form a nucleated gel; and (iii) reacting the nucleated gel at a temperature of from 0 C. to 200 C. to form the hierarchically porous aluminosilicate material.

The present application pertains to family of new crystalline molecular sieves designated SSZ-92. Molecular sieve SSZ-92 is structurally similar to sieves falling within the ZSM-48 family of molecular sieves and is characterized as having magnesium.

The present invention relates to a new process for synthesising the silicoaluminate form of the AEI zeolite structure based on the use of another zeolite, zeolite Y, as the only source of silicon and aluminum, in order to obtain high synthesis yields (greater than 80%) in the absence of any other source of silicon, phosphine-derivedcationsand fluoride anions in the synthesis medium. The N,N-dimethyl-3,5-dimethylpiperidinium cation may be used as the OSDA, and the FAU crystal structure is transformed into the AEI crystal structure with high yields. It also discloses the preparation of catalysts based on the silicoaluminate form of the AEI crystal structure, wherein Cu atoms have been introduced, and the subsequent application thereof as a catalyst, preferably in the SCR of NOx.

A highly practical SCR catalyst excellent in NO.sub.x purification performance is provided. The SCR catalyst includes a blend of an aluminosilicate molecular sieve that has supported thereon copper as an extra-framework metal and that has a CHA framework, and a silicoaluminophosphate molecular sieve that has a CHA framework, and is adapted to perform selective catalytic reduction of NO.sub.x. In the SCR catalyst, the silicoaluminophosphate molecular sieve and the aluminosilicate molecular sieve contain silicoaluminophosphate and aluminosilicate, respectively, in a molar ratio of silicoaluminophosphate:aluminosilicate of 0.1:1.0 to 0.4:1.0.

Various zeolites may be produced under hydrothermal synthesis conditions in the presence of a silicon atom source and a bis-pyridinium compound having a structure represented by formula (I). Q is an optionally substituted C1-C10 hydrocarbyl group and two Q may join to form a carbocyclic ring; n is an integer ranging from 0 to 5; m is an integer ranging from 0 to 5; n+m is greater than or equal to 1; and A is a spacer group containing 2 to about 10 atoms.

##STR00001##

A family of new crystalline molecular sieves designated SSZ-91 is disclosed. Molecular sieve SSZ-91 is structurally similar to sieves falling within the ZSM-48 family of molecular sieves, and is characterized as: (1) having a low degree of faulting, (2) a low aspect ratio that inhibits hydrocracking as compared to conventional ZSM-48 materials having an aspect ratio of greater than 8, and (3) is substantially phase pure.

A method is disclosed for synthesizing molecular sieve material designated SSZ-105 using N-methyl quinuclidinium cations or N,N-dimethyl-1,4-diazabicyclo[2.2.2]octane dications as a structure directing agent. SSZ-105 is a disordered aluminosilicate molecular sieve comprising at least one intergrown phase of an ERI framework type molecular sieve and an LEV framework type molecular sieve.