A zeolite membrane composite for use in separation of a highly-permeative component through permeation from a vapor mixture or a liquid mixture comprising multiple components, the zeolite membrane composite comprising an inorganic porous support and a zeolite membrane provided thereon, wherein the zeolite membrane contains zeolite of a CHA-type aluminosilicate, and in a X-ray diffraction pattern obtained through irradiation to the zeolite membrane surface with X-ray, a peak intensity at around 2?=17.90 has a value of less than 0.5 times a peak intensity at around 2?=20.80 and a peak intensity at around 2?=9.6? has a value of 2.0 times or more and less than 4.0 times a peak intensity at around 2?=20.8?.

Methods for forming two-dimensional (2D) zeolite nanosheets include exposing a multi-lamellar (ML) zeolite material including an organic structure directing agent (OSDA) to a mixture including sulfuric acid and hydrogen peroxide under conditions sufficient to remove substantially all of the OSDA from the ML zeolite material; and after exposing the ML zeolite material, treating a solution containing the ML zeolite material to sonication and/or mixing under conditions sufficient to substantially exfoliate layers of the ML zeolite to obtain porous two-dimensional zeolite nanosheets that are substantially free of the OSDA. In some cases, without further treatment such as secondary growth of the zeolite coating layer, a deposit of the OSDA-free nanosheets on polymer support exhibits hydrocarbon isomer selectivity.

A separation membrane structure comprising a porous support, a first glass seal, and a separation membrane. The porous support includes through-holes which connect a first end surface and a second end surface. The first glass seal is configured to cover the first end surface. The separation membrane is formed on an inner surface of the through-holes. The first glass seal has a first seal body part and a first extension part. The first seal body part is disposed on the first end surface. The first extension part is connected to the first seal body part and disposed on the inner surface of the through-holes. The separation membrane has a first connection part connected to the first extension part of the first glass seal. A first thickness of the first connection part is less than or equal to 10 microns, and less than or equal to 3.2 times a center thickness at a longitudinal center of the separation membrane.

Metal organic framework membranes can be used in gas separation applications.

The present invention addresses the problem of providing a technology for efficiently separating carbon dioxide in a method for separating carbon dioxide from a mixed gas by using a membrane separation method.

The problem is solved by a method including supplying a mixed gas to a separation membrane module to separate carbon dioxide from the mixed gas, in which the mixed gas is supplied to the separation membrane module at a high linear velocity in order to sufficiently mix a mixed gas in the vicinity of a membrane.

A zeolite membrane complex includes a porous support and a zeolite membrane formed on the support and containing aluminum, silicon, and carbon. In the zeolite membrane, the molar ratio of carbon to the sum of aluminum and silicon is higher than or equal to 0.1. In the zeolite membrane complex, when a mixed solution having a temperature of 60? C. and containing 50 mass % of water and 50 mass % of ethanol is supplied with a permeate pressure of ?94.66 kPaG, the total permeation flux is higher than or equal to 1.0 kg/m.sup.2 h, and a separation factor of water to ethanol is greater than or equal to 1000.

A zeolite membrane composite for use in separation of a highly-permeative component through permeation from a vapor mixture or a liquid mixture comprising multiple components, the zeolite membrane composite comprising an inorganic porous support and a zeolite membrane provided thereon, wherein the zeolite membrane contains zeolite of a CHA-type aluminosilicate, and in a X-ray diffraction pattern obtained through irradiation to the zeolite membrane surface with X-ray, a peak intensity at around 2?=17.90 has a value of less than 0.5 times a peak intensity at around 2?=20.80 and a peak intensity at around 2?=9.6? has a value of 2.0 times or more and less than 4.0 times a peak intensity at around 2?=20.8?.

Provided is a method for manufacturing a porous body by which a porous body having a plurality of layers different from each other in pore diameter can be manufactured more easily than before. The method includes heating a raw material solution including a metal ion and an organic ligand to synthesize an interpenetrated metal-organic framework layer; and after synthesizing the interpenetrated metal-organic framework layer, synthesizing a non-interpenetrated metal-organic framework layer under conditions in which concentrations of the metal ion and the organic ligand in the raw material solution and/or a heat temperature are lower than that in synthesizing the interpenetrated metal-organic framework, to obtain a porous body including the interpenetrated metal-organic framework layer and the non-interpenetrated metal-organic framework layer stacked together.

Metal organic framework membranes can be used in gas separation applications.

The present invention relates to a chabazite zeolite membrane with a controlled pore size and a production method thereof, wherein the sizes of pore space and pore mouth of the chabazite zeolite membrane are finely controlled through chemical vapor deposition. Through the chemical vapor deposition, defects present in the chabazite zeolite membrane are eliminated, and the pore size is effectively controlled. Thus, unlike hydrophilic membranes showing excellent CO.sub.2/N.sub.2 separation performance under a dry condition, the chabazite zeolite membrane with a controlled pore size according to the present invention has a hydrophobic surface, and thus can maintain excellent CO.sub.2/N.sub.2 separation performance even under a wet condition. Accordingly, the chabazite zeolite membrane of the present invention can effectively capture carbon dioxide from nitrogen under various environmental conditions.