The invention relates to a method for preparing a hierarchical porous zeolite membrane and an application thereof, comprising the following steps: a mesoporous structure-directing agent is added to limit the growth of zeolite crystals, and self-assembled in the crystallization process to generate a mesoporous structure. Based on a seed crystal induced secondary nucleation mechanism, this method can realize one-step hydrothermal synthesis of hierarchical porous zeolite membrane with the advantages of mild and controllable synthesis conditions, simple process, good repeatability, reduced energy consumption and cost savings. The hierarchical porous zeolite membrane prepared by the method has good cut-off performance, and the cut-off molecular weight is adjustable between 200 to 500,000 Da.

The present invention provides a method for preparing a mordenite, which is a method for preparing the mordenite through a hydrothermal crystallization by using natural aluminosilicate minerals as total silicon sources and total aluminum sources, comprising the steps of: subjecting the natural aluminosilicate minerals to activation treatment which is an activation by sub-molten salt and an activation by thermal treatment; selecting and mixing the activated natural aluminosilicate minerals according to the silicon-to-aluminum ratio of the targeted mordenite, adding thereto deionized water, sodium hydroxide, crystal seed, a templating agent to obtain a reaction mixture; adjusting the reaction mixture by using an inorganic acid to have a pH of 10-13, and then aging it at 40-80° C. for 6-24 hours; and subjecting the aged reaction mixture to hydrothermal crystallization, and then filtering, washing, drying and calcinating the crystallized product to obtain the mordenite. The method for preparing a mordenite provided in the present invention enlarges the sources of raw materials for a molecular sieve, has a low cost and a simple process route, and can largely reduce the cost for synthesizing a molecular sieve.

Disclosed are a catalyst system and its use in a process for the conversion of a feedstock containing C.sub.8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene. The catalyst system comprises (a) a first catalyst bed comprising a first catalyst composition, said first catalyst composition comprising a zeolite having a constraint index of 3 to 12 combined (i) optionally with at least one first metal of Group 10 of the IUPAC Periodic Table, and (ii) optionally with at least one second metal of Group 11 to 15 of the IUPAC Periodic Table; and (b) a second catalyst bed comprising a second catalyst composition, said second catalyst composition comprising (i) a meso-mordenite zeolite, combined (ii) optionally with at least one first metal of Group 10 of the IUPAC Periodic Table, and (iii) optionally with at least one second metal of Group 11 to 15 of the IUPAC Periodic Table, wherein said meso-mordenite zeolite is synthesized from TEA or MTEA and having a mesopore surface area of greater than 30 m.sup.2/g and said meso-mordenite zeolite comprises agglomerates composed of primary crystallites, wherein said primary crystallites have an average primary crystal size as measured by TEM of less than 80 nm and an aspect ratio of less than 2.

The present invention relates to a process for the preparation of a zeolitic material comprising YO.sub.2 in its framework structure, wherein Y stands for a tetravalent element, wherein said process comprises the steps of: (1) providing a mixture comprising one or more sources for YO.sub.2, one or more fluoride containing compounds, and one or more structure directing agents; (2) crystallizing the mixture obtained in step (1) for obtaining a zeolitic material comprising YO.sub.2 in its framework structure;
wherein the mixture provided in step (1) and crystallized in step (2) contains 35 wt.-% or less of H.sub.2O based on 100 wt.-% of YO.sub.2 contained in the mixture provided in step (1) and crystallized in step (2), as well as to a zeolitic material comprising YO.sub.2 in its framework structure obtainable and/or obtained according to said process, and to a zeolitic material per se comprising SiO.sub.2 in its framework structure, wherein in the .sup.29Si MAS NMR spectrum of the as-synthesized zeolitic material the ratio of the total integration value of the peaks associated to Q3 signals to the total integration value of the peaks associated to Q4 signals is in the range of from 0:100 to 20:80, including the use of the aforementioned zeolitic materials.

Methods and corresponding catalysts are provided for conversion of an aromatics feed containing C.sub.8+ aromatics, particularly C.sub.9+ aromatics, to form a converted product mixture comprising, e.g., benzene and/or xylenes. The aromatic feed can be converted in the presence of a catalyst that includes a mixture of a first zeolite having an MEL framework, such as ZSM-11, and a second zeolite having a MOR framework, such as mordenite, particularly a mordenite synthesized using TEA or MTEA as a structure directing agent. The weight ratio of the first zeolite to the second zeolite in the catalyst can be from 0.3 to 1.2, or from 0.3 to 1.1, or from 0.3 to 1.0. The catalyst can further include one or more metals supported on the catalyst, such as a combination of metals.

The present disclosure relates to a method for preparing a mordenite zeolite, the method including crystallizing, at a temperature of 150° C. to 190° C., a gel which includes, in mol based on 1 mol of silica, 0.02 to 0.2 of an alumina precursor, 0.01 to 0.04 of a structure-directing agent, 0.1 to 0.18 of a pH control agent, and 10 to 100 of water. According to the present disclosure, a mordenite zeolite having high particle size uniformity and a particle size controllable while maintaining the particle size uniformity may be prepared.

The present disclosure is directed to a method of manufacture of mordenite zeolites. This is accomplished by using an improved sol-gel formulation including a water-soluble fraction of ODSO as an additional component. The resulting products are, or contain, mordenite zeolites, with increased yield.

The present disclosure is directed to a method of manufacture of beta zeolites. This is accomplished by using an improved sol-gel formulation including a water-soluble fraction of ODSO as an additional component. The resulting products are, or contain, beta zeolites, with increased yield.

The present disclosure is directed to a method of manufacture of beta zeolites. This is accomplished by using an improved sol-gel formulation including a water-soluble fraction of ODSO as an additional component. The resulting products are, or contain, beta zeolites, with increased yield.

A process for preparing an oxidic material comprising a zeolitic material having framework type AEI and a framework structure comprising a tetravalent element Y, a trivalent element X, and O, the process comprising preparing a synthesis mixture comprising water, a source of Y, a source of X comprising sodium, an AEI framework structure directing agent, and a source of sodium other than the source of X; and heating the synthesis mixture obtained from (i) to a temperature in the range of from 100 to 180° C. and keeping the synthesis mixture under autogenous pres-sure at a temperature in this range for a time in the range of at least 6 h, obtaining the oxidic material comprising a zeolitic material having framework type AEI and a framework structure comprising a tetravalent element Y, a trivalent element X, and O, comprised in its mother liquor; wherein the AEI framework structure directing agent according to (i) comprises a N, N-diethyl-2,6-dimethylpiperidinium cation.