摘要:
This invention relates to a process for making a germanium-zeolite without using fluoride compounds. The zeolite is preferably a MFI-type structure, most preferably a ZSM-5 MFI zeolite. The germanium-zeolite is synthesized essentially in the absence of fluoride compounds from an aqueous gel containing a silica source, a germanium source, an aluminum source and a structure directing agent in the presence of an acid which does not contain fluorine, such as sulfuric acid, acetic acid, nitric acid, phosphoric acid hydrochloric acid or formic acid.
摘要:
A zeolite membrane excellent in separation performance and having an acid resistance, and a separation membrane employing the zeolite membrane are provided. A zeolite membrane comprising a layer wherein at least two different types of zeolite crystals are present in mixed state, wherein at least two types of the above at least two different types of zeolite crystals are detectable by an X-ray pattern obtained by X-ray diffraction under the conditions that (A) the output of X-ray is 1.2 kW, (B) an X-ray bulb of copper (Cu) is employed, and (C) the wavelength of X-ray is 1.54058 A. As an alternative, the zeolite membrane comprising a first layer containing zeolite crystals and a second layer containing different type of zeolite crystals from the zeolite crystals of the first layer, wherein the first layer and the second layer constitute a laminate structure, and the thickness of the laminate structure is at most 20 µm.
摘要:
An object of the present invention is to provide a porous support-zeolite membrane composite ensuring that at the time of separation or concentration with a zeolite membrane, both sufficient throughput and high separation performance are achieved in practice. The present invention relates to a porous support-zeolite membrane composite having a porous support and a zeolite membrane formed on the porous support, wherein part of the zeolite membrane penetrates into the inside of the porous support and the distance from the surface of the porous support to the inside into which the zeolite film penetrates is 5.0 µm or less on average.
摘要:
A gas adsorbent includes copper-exchanged ZSM-5 zeolite, and the crystallinity of the copper-exchanged ZSM-5 zeolite is set to at least 40% and up to 80%.
摘要:
A zeolite includes Si, Al, Ag and at least one of an alkali metal or alkaline earth metal, and satisfies the relation 0.02≦Ag[mol%]/(Si[mol%] + 10 x T[mol%])≦0.17 (wherein, T[mol%] denotes the molar concentration of the alkali metal and alkaline earth metal.)
摘要翻译:沸石包括Si,Al,Ag和碱金属或碱土金属中的至少一种,并且满足0.02‰| Ag [mol%] /(Si [mol%] + 10×T [mol%])‰ |0.17(其中,T [mol%]表示碱金属和碱土金属的摩尔浓度。