The present invention relates to a method of controlling a defect structure in a chabazite (CHA) zeolite membrane, the CHA zeolite membrane having a controlled defect structure by the method and a method of separating CO.sub.2, H.sub.2, or He and water from a mixture of water and an organic solvent using the CHA zeolite membrane, and more particularly, to a method of controlling a defect structure in a CHA zeolite membrane that improves the separation performance by reducing the amount and size of defects formed in the CHA membrane structure when removing organic-structure-directing agents in the membrane through calcination at a low temperature using ozone.

The invention relates to a process for preparing an AFX-structure zeolite comprising at least the following steps: i) mixing, in an aqueous medium, an FAU-structure zeolite having an SiO.sub.2 (FAU)/Al.sub.2O.sub.3 (FAU) molar ratio of between 2.00 (limit included) and 6.00 (limit excluded), an organic nitrogenous compound R, at least one source of at least one alkali and/or alkaline-earth metal M, the reaction mixture having the following molar composition: (SiO.sub.2 (FAU))/(Al.sub.2O.sub.3 (FAU)) between 2.00 (limit included) and 6.00 (limit excluded), H.sub.2O/(SiO.sub.2 (FAU)) between 1 and 100, R/(SiO.sub.2 (FAU)) between 0.01 and 0.6, M.sub.2/nO/(SiO.sub.2 (FAU)) between 0.005 and 0.7, limits included, until a homogeneous precursor gel is obtained; ii) hydrothermal treatment of said precursor gel obtained on conclusion of step i) at a temperature of between 120 C. and 220 C., for a time of between 12 hours and 15 days.

One aspect is a production process including feeding a feed material composition into a reaction zone at a feeding position, wherein the feed material composition is liquid or gaseous or both; reacting the feed material composition in the reaction zone into a first plurality of particles by a chemical reaction; depositing the first plurality of particles onto a substrate surface of a substrate, thereby obtaining a porous silicon dioxide material, having a pore structure, in the form of up to 20 layers superimposing the substrate surface; at least partially removing the porous silicon dioxide material from the substrate surface; and modifying the pore structure of the porous silicon dioxide material, thereby obtaining the porous silicon dioxide material having a further pore structure.

The invention relates to a method for synthesizing silicoaluminophosphate sorbents such as SAPO-56 and SAPO-47 comprising the use of a specific structure directing agent (SDA) comprising a mixture of different types of amines The structure providing agent (SDA) comprises N,N,N,N-tetramethyl-1,6-hexanediamine (TMHD) and a co-structure providing agent (co-SDA) selected among primary, secondary and tertiary amines comprising up to 15 carbon atoms and mixtures thereof. A preferred SDA comprises isopropylamine, dibutylamine and tripropylamine The sorbents are particularly suitable for up-grading biogas such as separating carbon dioxide from methane.

A novel process is described for the preparation of a microporous crystalline solid, known as IZM-2 microporous solid or IZM-2 zeolite. This novel process consists of carrying out the synthesis of IZM-2 zeolite by conversion/transformation of a zeolite with structure type FAU under hydrothermal conditions. In particular, said novel process consists of carrying out the synthesis of an IZM-2 zeolite starting from a zeolite with structure type FAU used as the source of silicon and aluminium and a specific organic molecule or template comprising two quaternary ammonium functions, namely 1,6-bis(methylpiperidinium)hexane dibromide.

The present invention relates to a hydrocarbon adsorbent with metal-impregnated zeolite particles having regular mesopores and a manufacturing method therefor. The hydrocarbon adsorbent includes a metal cation and a metal oxide that are impregnated in zeolite particles, in particular, the zeolite particles include regularly formed mesopores having a size of 2 to 10. By adjusting a Si/Al ratio and mesoporosity of the mesopores, a hydrocarbon adsorbent may have increased adsorption capacity for hydrocarbons in a cold-start section and can rapidly oxidize the hydrocarbon upon desorption thereof, thereby reducing the discharge of exhaust gas produced in automobiles and industries.

A system and method for synthesizing a nanoparticle material includes dissolving a metal nitrate in deionized water, adding a hydrogel precursor in the deionized water containing the dissolved metal nitrate to create an aqueous solution, heating the aqueous solution, cooling the aqueous solution to create a solid gel, and calcinating the solid gel to create a metal oxide nanoparticle material. The metal oxide nanoparticle material may include a zinc oxide-based nanoparticle material. The hydrogel precursor may include an agarose gel. The solid gel may be calcinated at approximately 600 C. The solid gel may be calcinated for approximately five hours in the presence of air. The aqueous solution may be heated to a boil. The aqueous solution may be heated at a temperature of 100 C.

A hydrocarbon adsorbent, according to one embodiment of the present invention, comprises a copper-containing ZSM-5 zeolite, wherein a Si/Al molar ratio of the ZSM-5 zeolite may be 11.5 to 40, and the amount of the copper included is 1 wt % to 10 wt %.

The disclosure is related to small crystal forms of SSZ-27 molecular sieve materials, methods for making, and uses of the same.

Superficially porous particles are disclosed, each including a solid core and a layered porous shell. The layered porous shell includes a porous inner layer and at least one porous outer layer, a shell skeleton thickness greater than 1 nm, and constitutes from 10 vol % to 90 vol % of the plurality of superficially porous particles. The porous inner layer includes an inner layer thickness of less than 300 nm. The at least one porous outer layer includes a cumulative outer layer thickness ranging from 1 to 100 times the inner layer thickness, a predominately radial pore orientation, and an outer layer pore structure which is more organized than the inner layer pore structure. A layer-by-layer process for forming a plurality of superficially porous particles with layered structure is disclosed. A post-modification process for preparing a plurality of chromatographically enhanced superficially porous properties is also disclosed.