Disclosed are a MWW/DDR type gas separation membrane comprising at least one MWW type zeolite and at least one DDR type zeolite and a method for preparing the same. One of the MWW type zeolite and the DDR type zeolite is disposed on the other thereof, wherein at least one of the MWW type zeolite and the DDR type zeolite is epitaxially grown. In the gas separation membrane, the DDR type zeolite is epitaxially grown from the MWW type zeolite, or the MWW type zeolite is epitaxially grown from the DDR type zeolite. Thus, the MWW/DDR type gas separation membrane is synthesized using a structural continuity of the MWW type zeolite and the DDR type zeolite. Thus, the gas separation membrane has excellent separation efficiency.

Provided is a separation membrane that is suitable for use in separating one or more hydrocarbons from a hydrocarbon mixture. More specifically, the separation membrane includes a porous support for which acid content is not substantially detected by ammonia temperature programmed desorption in a temperature range of higher than 450° C. and not higher than 600° C. and a porous separation layer containing a zeolite that is disposed on the porous support.

A crystalline material contains oxygen, aluminum and phosphorus, and has powder X-ray diffraction peaks shown below. When the peak at 2θ=14.17±0.2° is used as the reference peak and the intensity of the reference peak is set to 100, for example, the relative intensity of the peak at 2θ=8.65±0.2° is 1 to 15. The relative intensity of the peak at 2θ=9.99±0.2° is 1 to 15. The relative intensity of the peak at 2θ=16.52±0.2° is 5 to 80. The relative intensity of the peak at 2θ=17.37±0.2° is 1 to 15. The relative intensity of the peak at 2θ=21.81±0.2° is 10 to 80.

A separation membrane complex includes a porous support, a dense part covering one surface of the support from a boundary position toward one side in a predetermined direction on the surface, and a separation membrane covering the surface from the boundary position toward the other side and covering the dense part in the vicinity of the boundary position. In a case where, in a cross section, within a specified range from the boundary position toward the one side in the predetermined direction up to 30 μm, a maximum angle among angles formed of the surface and lines connecting respective positions on a surface of the dense part on a side of the separation membrane and the boundary position is acquired as an evaluation angle, a maximum value of four evaluation angles at four measurement positions is not smaller than 5 degrees and not larger than 45 degrees.

The invention includes compositions and methods for promoting gas mixtures separations, such as a carbon dioxide and methane mixture. The composition of the invention is based on a curable polymerized room-temperature ionic liquid [poly(RTIL)].

A separation membrane complex includes a support, a separation membrane, and a coating membrane. The support includes a porous portion and a dense portion that are arranged continuously. The separation membrane is provided on the porous portion of the support. The separation membrane has an end portion that is in contact with the dense portion. The coating membrane is composed by a layered inorganic compound. The coating membrane coats a boundary portion between the dense portion and the separation membrane.

The present disclosure is directed to processes for the selective separation of carbon dioxide (CO.sub.2) from multi-component feedstreams containing CO.sub.2. The processes use a potassium-form MER framework type zeolite having a stick-like morphology. The potassium is present in the zeolite as K.sup.+ in extra-framework locations, and the zeolite is essentially free of an extra-framework cation other than potassium.

A method of encapsulating an engineered pellet in a porous membrane is disclosed. The method includes the steps of: (i) dissolving a membrane solute in a membrane solvent to produce a membrane solution; (ii) applying the membrane solution to a pellet to form a pellet encapsulated with the membrane solution; (iii) subjecting the membrane solution that encapsulates the pellet to a phase inversion and; (iv) drying the pellet to form a porous membrane encapsulated pellet. A porous membrane encapsulated pellet is also described.

Solid sorbents, and especially zeolites, are attractive candidates for CO.sub.2 direct air capture (DAC) and point source capture applications because of their potential for high selectivity, fast kinetics, and low energy CO.sub.2 capture cycles. A common issue with solid sorbents, including zeolites, is their low thermal conductivity, which makes them difficult to heat for regeneration without using complex and expensive heat transfer systems. This invention utilizes a modified TVSA process which utilizes the product CO.sub.2 gas itself as the heating medium for the adsorbent bed, alone or in conjunction with internal or external heaters. The use of CO.sub.2 as a heating medium allows efficient heating of the sorbent bed and enables high purity CO.sub.2 product.

A green energy generating system (e.g., thermal, solar, wind, kinetic) is integrated with a selective molecular separation (i.e., greenhouse gas capturing) system. The output of each system is utilized by the other to form a unitary system that produces green energy (i.e., electricity) while separating/capturing predetermined molecules (e.g., greenhouse gases) from the environment. The process includes providing kinetic energy fluid from an energy source; driving a turbine via the kinetic energy fluid; driving a generator via the turbine to generate electricity; supplying (i) the kinetic energy fluid exiting the turbine and/or (ii) electricity generated by the generator to a molecular separation unit; intaking the predetermined molecules into the separation unit and selectively separating at least one predetermined molecule from other molecules; and capturing the predetermined molecule via a desorption process using heat from thermal energy of (i) the kinetic energy fluid and/or (ii) an electrical heater powered by the electricity.