A separation membrane structure comprises a porous support body, a zeolite membrane formed on the porous support body and comprising pores having a major diameter and a minor diameter. The ratio of a major diameter to a minor diameter is greater than 1.0. The minor diameter is greater than or equal to 0.30 nm and less than or equal to 0.35 nm.

A modified Y-type molecular sieve has a unit cell size of 2.420-2.440 nm. It contains a phosphorus content of 0.05-6%, a RE.sub.2O.sub.3 content of 0.03-10%, and an alumina content of less than 22%, and a specific hydroxyl nest concentration of less than 0.35 mmol/g and more than 0.05 mmol/g. The modified Y-type molecular sieve is used as the active component in a catalytic cracking catalyst. The catalytic cracking catalyst maintains a stable activity for a long time, effectively controls the coke yield and increases the heavy oil utilization.

A small crystal size, high surface area aluminogermanosilicate molecular sieve material, designated SSZ-120, is provided. SSZ-120 can be synthesized using 3,3′-[2,6-naphthalenebis(methylene)]bis[1,2-dimethyl-1H-imidazolium] dications as a structure directing agent. SSZ-120 may be used in organic compound conversion reactions and/or sorptive processes.

A method for preparing an adsorbent is disclosed that includes mixing an NaY zeolite, aqueous Al(OH).sub.3, and aqueous KOH, and then heating the resultant mixture for an allotted amount of time to achieve a composition comprising at least 90% single phase chabazite having an Si/Al ratio of 1.0 to 2.2.

A continuous process for the preparation of propylene oxide, comprising (i) providing a liquid feed stream comprising propene, hydrogen peroxide, acetonitrile, water, optionally propane, and at least one dissolved potassium salt; (ii) passing the feed stream provided in (i) into an epoxidation reactor comprising a catalyst comprising a titanium zeolite of structure type MWW, and subjecting the feed stream to epoxidation reaction conditions in the epoxidation reactor, obtaining a reaction mixture comprising propylene oxide, acetonitrile, water, the at least one potassium salt, optionally propene, and optionally pane; (iii) removing an effluent stream from the epoxidation reactor, the effluent stream comprising propylene oxide, acetonitrile, water, at least a portion of the at least one potassium salt, optionally propene, and optionally propane.

A method for preparing a zeolite molecular sieve includes the steps of: (1) mixing at least one of a silicon source, an aluminum source and a phosphorus source with an alkaline substance, a template agent and water uniformly to obtain a zeolite molecular sieve precursor solution; aging the zeolite molecular sieve precursor solution at 20-30° C. for 10-15 h; and subjecting the aged solution to ionizing radiation, and then washing the obtained solid to neutrality and drying to obtain the zeolite molecular sieve. The method of the present invention is green, simple and extremely cost-effective. Under the irradiation of an ionizing radiation source, the synthesis period of zeolite molecular sieve is short and no heating is needed in the preparation process, so energy consumption is reduced and a high-pressure system is avoided.

A method for producing a hierarchical mesoporous beta includes mixing a beta zeolite with an aqueous metal hydroxide solution and heating the beta zeolite and the aqueous metal hydroxide mixture to produce a desilicated beta zeolite, contacting the desilicated beta zeolite with an ammonium salt solution to produce an intermediate hierarchical mesoporous beta zeolite, and treating the intermediate hierarchical mesoporous beta zeolite with an acidic solution to produce the hierarchical mesoporous beta zeolite. The hierarchical mesoporous beta zeolite includes a molar ratio of silicon to aluminum of greater than 12.5, a total pore volume of greater than or equal to the total pore volume of the intermediate hierarchical mesoporous beta zeolite, and an average mesopore size of greater than or equal to the average mesopore size of the hierarchical mesoporous beta zeolite. The method may also include calcining the intermediate hierarchical mesoporous beta zeolite.

A method for manufacturing a zeolite membrane structure includes a step of forming a first zeolite membrane on a porous support by hydrothermal synthesis in a state in which the porous support is immersed in a first zeolite membrane formation solution, a step of immersing the porous support formed the first zeolite membrane for greater than or equal to 5 minutes in a second zeolite membrane formation solution at greater than or equal to 10 degrees C. and less than or equal to 70 degrees C. and greater than or equal to pH 10, and a step of forming a second zeolite membrane on the first zeolite membrane by hydrothermal synthesis in a state in which the porous support formed the first zeolite membrane is immersed in the second zeolite membrane formation solution. The first zeolite membrane and the second zeolite membrane share at least one composite building unit constituting a framework structure.

A dye loaded zeolite composite material comprises a plurality of zeolite crystals each having a plurality of straight through uniform channels extending between the proximal face and the distal face and having a channel axis parallel to and a channel width transverse to a longitudinal crystal axis A. Each channel contains a substantially linear arrangement of dye molecules comprising first and second dye molecules having an elongated shape with a longitudinal extension exceeding said channel width and a lateral extension not exceeding said channel width. Each dye molecule consists of a chromophore moiety arranged between a pair of terminal moieties, wherein: the chromophore moieties of the first and second dye molecules are substantially identical, the terminal moieties of the first dye molecules have a lateral extension larger than half of the channel width, the terminal moieties of the second dye molecules have a lateral extension smaller than half of the channel width, the linear arrangement of dye molecules comprises at least one pair of second dye molecules adjacent each other.

A dye loaded zeolite composite material comprises a plurality of zeolite crystals each having a plurality of straight through uniform channels extending between the proximal face and the distal face and having a channel axis parallel to and a channel width transverse to a longitudinal crystal axis A. Each channel contains a substantially linear arrangement of dye molecules comprising first and second dye molecules having an elongated shape with a longitudinal extension exceeding said channel width and a lateral extension not exceeding said channel width. Each dye molecule consists of a chromophore moiety arranged between a pair of terminal moieties, wherein: the chromophore moieties of the first and second dye molecules are substantially identical, the terminal moieties of the first dye molecules have a lateral extension larger than half of the channel width, the terminal moieties of the second dye molecules have a lateral extension smaller than half of the channel width, the linear arrangement of dye molecules comprises at least one pair of second dye molecules adjacent each other.