Abstract: Provided is a layered double hydroxide (LDH) separator including a porous substrate made of a polymeric material, and LDH with which pores of the porous substrate are plugged. The LDH separator has a plurality of remaining flattened pores, longitudinal directions of the pores being non-parallel to a thickness direction of the LDH separator.

Abstract: There is provided a functional layer including a layered double hydroxide. The functional layer further contains titania.

Abstract: There is provided a functional layer including a layered double hydroxide, which is composed of: a plurality of basic hydroxide layers including Ni, Al, Ti, and OH groups; and intermediate layers composed of anions and H2O, each intermediate layer being interposed between two adjacent basic hydroxide layers.

Abstract: There is provided a functional layer including a layered double hydroxide. The layered double hydroxide does not undergo a change in the surface microstructure and the crystalline structure when immersed in 5 mol/L of an aqueous potassium hydroxide solution containing zinc oxide in a concentration of 0.4 mol/L at 70° C. for three weeks.

Abstract: Provided is a zeolite membrane manufactured by: subjecting a porous body to heat treatment at 400° C. or more in the presence of oxygen as pretreatment, before adhering zeolite seed crystals to a surface of the porous body; storing the porous body under an environment of humidity of 30% or more for 12 hours or more after the heat treatment; and subsequently adhering the zeolite seed crystals to the porous body. The zeolite membrane having oxygen eight-membered rings, which is manufactured by subjecting the porous body to the heat treatment, provides a value that is obtained by dividing a permeance of CF4 by a permeance of CO2 to be 0.015 or less, and has fewer defects.

Abstract: Provided are a ceramic separation membrane structure improved in separation performance with no reduction in permeability, and a method for producing the structure. The ceramic separation membrane structure includes a ceramic porous body, a zeolite separation membrane disposed on the ceramic porous body, and a repair portion made of a repairing material of organic-inorganic hybrid silica. The organic-inorganic hybrid silica is a combination of an organic component and a silicon-containing inorganic component.

Abstract: There is disclosed a ceramic separation membrane. This ceramic separation membrane includes a porous substrate, and a separation layer formed on the substrate. The separation layer is a laminate having an outermost layer positioned on the most surface side, and a base layer positioned in a lower layer than the outermost layer and made of zeolite. The outermost layer is a layer made of a siliceous material containing 90 mol % or more of silica, an organic material-containing amorphous silica material having a Si—Cn—Si (wherein n is 1 or 2) bond and a Si/C ratio of 0.5 to 2, or a carbonaceous material containing 90 mass % or more of carbon. The outermost layer is different from the base layer.

Abstract: Provided are a ceramic separation membrane structure improved in separation performance with no reduction in permeability, and a method for producing the structure. The ceramic separation membrane structure includes a ceramic porous body 9, a zeolite separation membrane 33 disposed on the ceramic porous body 9, and a repair portion 34 made of a repairing material of organic-inorganic hybrid silica. The organic-inorganic hybrid silica is a combination of an organic component and a silicon-containing inorganic component.

Abstract: Provided is a zeolite membrane manufactured by: subjecting a porous body to heat treatment at 400° C. or more in the presence of oxygen as pretreatment, before adhering zeolite seed crystals to a surface of the porous body; storing the porous body under an environment of humidity of 30% or more for 12 hours or more after the heat treatment; and subsequently adhering the zeolite seed crystals to the porous body. The zeolite membrane having oxygen eight-membered rings, which is manufactured by subjecting the porous body to the heat treatment, provides a value that is obtained by dividing a permeance of CF4 by a permeance of CO2 to be 0.015 or less, and has fewer defects.

Abstract: There is disclosed a ceramic separation membrane. This ceramic separation membrane includes a porous substrate, and a separation layer formed on the substrate. The separation layer is a laminate having an outermost layer positioned on the most surface side, and a base layer positioned in a lower layer than the outermost layer and made of zeolite. The outermost layer is a layer made of a siliceous material containing 90 mol % or more of silica, an organic material-containing amorphous silica material having a Si-Cn-Si (wherein n is 1 or 2) bond and a Si/C ratio of 0.5 to 2, or a carbonaceous material containing 90 mass % or more of carbon. The outermost layer is different from the base layer.

Abstract: Provided is a ceramic separation filter having excellent separation performance and such acid resistance. The ceramic separation filter includes a porous substrate and a separation membrane disposed on the substrate. The separation membrane is a zeolite laminate including an outermost layer made of zeolite that is located on an outermost surface side and an underlayer made of zeolite that is located below the outermost layer, and the outermost layer of the separation membrane has a value of Si/Al ratio that is larger than a value of Si/Al ratio of the underlayer of the separation membrane. The thickness of the outermost layer of the separation membrane preferably is ½ or less of the thickness of the underlayer.