Abstract: A process for the manufacture of large crystal size synthetic porous crystalline molecular sieve requires an aqueous reaction mixture that is organic structure directing agent-free, has a H2O/MOH molar ratio (M is an alkali metal) of 75 or less, a source of X2O3 (X is a trivalent element) and a source of YO2 (Y is a tetravalent element). The source of X2O3 and YO2 is an amorphous material containing both X2O3 and YO2 and having a YO2/X2O3 molar ratio of 15 to 40. The resultant highly crystalline novel materials have crystals with at least one dimension greater than 1 ?m, such as greater than 3 ?m.

Abstract: A process for the manufacture of large crystal size synthetic porous crystalline molecular sieve requires an aqueous reaction mixture that is organic structure directing agent-free, has a H2O/MOH molar ratio (M is an alkali metal) of 75 or less, a source of X2O3 (X is a trivalent element) and a source of YO2 (Y is a tetravalent element). The source of X2O3 and YO2 is an amorphous material containing both X2O3 and YO2 and having a YO2/X2O3 molar ratio of 15 to 40. The resultant highly crystalline novel materials have crystals with at least one dimension greater than 1 ?m, such as greater than 3 ?m.

Abstract: A method is disclosed for modifying a catalytic molecular sieve for shape-selective hydrocarbon conversions comprises: a) selectivating said catalytic molecular sieve by contacting with a silicon-containing selectivating agent; and b) calcining the selectivated catalytic molecular sieve at high temperature calcination conditions comprising temperatures greater than 700° C., which conditions are sufficient to reduce acid activity as measured by alpha value and increase diffusion barrier of said catalytic molecular sieve as measured by the rate of 2,3-dimethylbutane uptake, as compared to the selectivated catalyst. Catalytic molecular sieves thus prepared, such as silica-bound ZSM-5, and their use in hydrocarbon conversion processes such as aromatics isomerization, e.g., xylene isomerization, ethylbenzene conversion and aromatics disproportionation, e.g., toluene disproportionation are also disclosed.

Abstract: A synthetic porous crystalline material has the structure of ZSM-5 and a composition involving the molar relationship: X2O3:(n)YO2, wherein X is a trivalent element; Y is a tetravalent element; and n is less than 25, and wherein the slope of the nitrogen sorption isotherm of the material at a partial pressure of nitrogen of 0.4 to 0.7 and a temperature 77° K is greater than 30. The material has a mesoporous surface area (MSA) greater than 45 m2/g and is useful as a catalyst in the liquid phase isomerization of xylene.

Abstract: This invention relates to a new synthetic crystalline material comprising acidic surface silanol groups, designated MCM-69, a method for its preparation and use thereof in catalytic conversion of organic compounds.

Abstract: A synthetic porous crystalline material has the structure of ZSM-5 and a composition involving the molar relationship:

Abstract: High activity ZSM-5 and ZSM-11, with alpha values of 1000 to 3500, are produced by synthesis from a reaction mixture containing an organic directing agent selected from a non-cyclic amine having the formula (C2H6N)nNmHq wherein n is 1, 2 or 3; m is 0 or 1; q is 0, 1 or 2 and (n+m+q) is either 2 or 4.

Abstract: A synthetic porous crystalline material has the structure of ZSM-5 and a composition involving the molar relationship: X2O3:(n)YO2, wherein X is a trivalent element; Y is a tetravalent element; and n is less than 25, and wherein the slope of the nitrogen sorption isotherm of the material at a partial pressure of nitrogen of 0.4 to 0.7 and a temperature 77° K is greater than 30. The material has a mesoporous surface area (MSA) greater than 45 m2/g and is useful as a catalyst in the liquid phase isomerization of xylene.

Abstract: The present invention relates to a composition and a method for preparing ZSM-48 exhibiting an X-ray pattern having values as set forth in Table 1 of the specification. The method of the present invention includes (a) preparing a reaction mixture; and (b) maintaining the mixture under crystallization conditions until crystals of the ZSM-48 are formed. The mixture includes a source of silica, a source of trivalent metal oxide, an alkali metal oxide, ethylenediamine and water. The mixture, in terms of mole ratios of oxides, has the following composition ranges:SiO.sub.2 /Me.sub.2 O.sub.3 : 100 to 1500,M.sub.2/n O/SiO.sub.2 : 0 to 0.2,RN/SiO.sub.2 : 2.0 to 5.0,OH.sup.- /SiO.sub.2 : 0 to 0.3, andH.sub.2 O/SiO.sub.2 : 10 to 100,wherein Me is a trivalent metal, M is an alkali metal and RN is ethylenediamine.