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.

The use of a palladium-doped zeolite for the adsorption of volatile organic compounds is described wherein the zeolite has a CHA framework type and is polymer-bound. Such zeolites have been found to have particular utility as packaging materials for the adsorption of volatile organic compounds, such as those originating from organic matter.

The use of a palladium-doped zeolite for the adsorption of volatile organic compounds is described wherein the zeolite has a CHA framework type and is polymer-bound. Such zeolites have been found to have particular utility as packaging materials for the adsorption of volatile organic compounds, such as those originating from organic matter.

An object of the invention is to provide a deodorizing filter superior in air-permeability as well as in deodorizing performance with respect to an unpleasant malodorous gas. A further object is to provide such a deodorizing filter and a deodorizing mask that do not have an unpleasant odor in themselves, or even after storage in a hermetically closed environment do not develop unpleasant odor or discoloration, and may be used comfortably. A deodorizing filter for a mask of the invention is provided with 2 or more layers of deodorizing fiber layers including a fiber and a chemisorption-type deodorizer, in which the deodorizing fiber layer contains a polyethylene resin fiber, and the thickness of the deodorizing fiber layer is from 0.15 to 0.4 mm, and the basis weight of the deodorizing fiber layer is from 20 to 45 g/m.sup.2.

An object of the invention is to provide a deodorizing filter superior in air-permeability as well as in deodorizing performance with respect to an unpleasant malodorous gas. A further object is to provide such a deodorizing filter and a deodorizing mask that do not have an unpleasant odor in themselves, or even after storage in a hermetically closed environment do not develop unpleasant odor or discoloration, and may be used comfortably. A deodorizing filter for a mask of the invention is provided with 2 or more layers of deodorizing fiber layers including a fiber and a chemisorption-type deodorizer, in which the deodorizing fiber layer contains a polyethylene resin fiber, and the thickness of the deodorizing fiber layer is from 0.15 to 0.4 mm, and the basis weight of the deodorizing fiber layer is from 20 to 45 g/m.sup.2.

The present invention relates to a new chiral zeolite material of composition a SiO.sub.2:b GeO.sub.2:c X.sub.2O.sub.3:d YO.sub.2, with an ITV structure, prepared with a specific chiral organic structure-directing agent, (1S,2S)—N-ethyl-N-methyl-pseudoephedrine or its enantiomer, (1R,2R)—N-ethyl-N-methyl-pseudoephedrine, which means that the material is rich in one of the crystalline forms; a method whereby said material is obtained, and the use thereof in adsorption and catalysis processes.

The present invention relates to a new chiral zeolite material of composition a SiO.sub.2:b GeO.sub.2:c X.sub.2O.sub.3:d YO.sub.2, with an ITV structure, prepared with a specific chiral organic structure-directing agent, (1S,2S)—N-ethyl-N-methyl-pseudoephedrine or its enantiomer, (1R,2R)—N-ethyl-N-methyl-pseudoephedrine, which means that the material is rich in one of the crystalline forms; a method whereby said material is obtained, and the use thereof in adsorption and catalysis processes.

An ammonia adsorption catalyst and a preparation method and a use thereof, where the ammonia adsorption catalyst includes a substrate and an adsorption layer located on the surface of the substrate, and the adsorption layer includes a noble metal-containing zeolite adsorption material. The catalyst has the advantages of high ammonia adsorption/conversion efficiency, low cost, and flexible application, etc.

The invention discloses a food container for preserving freshness of food, comprising a container body having a cavity adapted for containing food items; a lid detachably secured on the container body to close the cavity of the container; and one or more food preserving elements capable of absorbing food spoiling gas to preserve freshness of the food items. The one or more food preserving elements are disposed inside the cavity and/or into a material of the food container to preserve the food items for an extended period of time and remove odors.

The invention discloses a food container for preserving freshness of food, comprising a container body having a cavity adapted for containing food items; a lid detachably secured on the container body to close the cavity of the container; and one or more food preserving elements capable of absorbing food spoiling gas to preserve freshness of the food items. The one or more food preserving elements are disposed inside the cavity and/or into a material of the food container to preserve the food items for an extended period of time and remove odors.