Abstract: The present invention provides an electrode for hydrogen generation of which the hydrogen overvoltage is sufficiently low and which is not affected by poisoning due to iron ions, and furthermore, of which the durability is superior because during operations and stop-and-start control, the hydrogen overvoltage does not rise and exfoliation of the supported material does not occur. The present invention also provides a method for manufacturing the aforementioned hydrogen generation electrode and an electrolysis method using the electrode for hydrogen generation as a cathode. An electrode for hydrogen generation is used in which a platinum alloy including platinum and one metal selected from the group consisting of nickel, cobalt, copper, silver, and iron, or an amorphous material of a transition metal element and platinum is supported on a conductive base material.

Abstract: The present invention provides an electrode for hydrogen generation of which the hydrogen overvoltage is sufficiently low and which is not affected by poisoning due to iron ions, and furthermore, of which the durability is superior because during operations and stop-and-start control, the hydrogen overvoltage does not rise and exfoliation of the supported material does not occur. The present invention also provides a method for manufacturing the aforementioned hydrogen generation electrode and an electrolysis method using the electrode for hydrogen generation as a cathode. An electrode for hydrogen generation is used in which a platinum alloy including platinum and one metal selected from the group consisting of nickel, cobalt, copper, silver, and iron, or an amorphous material of a transition metal element and platinum is supported on a conductive base material.

Abstract: A fine low silica faujasite type zeolite of high purity, having a faujasite single phase as measured by X-ray diffractometry, wherein the SiO2/Al2O3 molar ratio is from 1.9 to 2.1, the water adsorption in the form of Na-type is at least 35.0%, and the primary particle size is at least 0.05 &mgr;m and less than 1.0 &mgr;m. A process for producing the low silica faujasite type zeolite by mixing and gelling a solution containing an aluminate and a solution containing a silicate, followed by aging and crystallization, wherein after the gelling and/or at the initial stage of the aging, a solution having a set composition and preliminary aged at recited conditions is added in an amount of from 0.03 to 10% as Al2O3.

Abstract: A novel heat-resistant low-silica zeolite, an industrial production process, and uses of the low-silica zeolite are provided. The heat-resistant low-silica zeolite contains Si and Al in a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 ranging from 1.9 to 2.1, and has sodium and/or potassium as metal cation, wherein the low-silica zeolite contains low-silica faujasite type zeolite at a content of not lower than 88%, and has a thermal decomposition temperature ranging from 870.degree. C. to 900.degree. C. in the air. The process for producing the heat-resistant low-silica zeolite comprises mixing a solution containing an aluminate with another solution containing a silicate, allowing the resulting mixture to gel, and aging the resulting gel, at the temperature of from 0.degree. C. to 60.degree. C., to prepare a slurry having a viscosity ranging from 10 to 10000 cp and containing amorphous aluminosilicate having a specific surface area of not less than 10 m.sup.2 /g with an SiO.sub.2 /Al.sub.2 O.sub.

Abstract: Disclosed are high purity low-silica faujasite type zeolite showing a faujasite single phase on X-ray diffraction, having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 1.9 to 2.1 and a water adsorption of 35.0% by weight or more when converted to the Na type, and comprising particles having smaller primary particle size and particles having larger primary particle size, wherein the primary particle size of the smaller particles is from 1 .mu.m to 8 .mu.m, the primary particle size of the larger particles is from 5 .mu.m to 15 .mu.m, and the particles having smaller primary particle size accounts for 90% or more of the total particle number; and a method for producing low-silica faujasite type zeolite having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 1.9 to 2.