Abstract: The present invention provides a catalyst for hydrogen peroxide decomposition with which hydrogen peroxide present in acid-containing water to be treated can be efficiently decomposed at low cost and which is less apt to dissolve away in the water being treated, can be stably used over a long period, and renders acid recovery and recycling possible. The present invention has solved the problems with a catalyst for hydrogen peroxide decomposition which is for use in decomposing hydrogen peroxide present in acid-containing water to be treated, the catalyst including a base and, a catalyst layer that is amorphous, includes a platinum-group metal having catalytic function and a Group-6 element metal having catalytic function and is formed over the base.

Abstract: A waste liquid treatment device (20) treats water to be treated that contains at least hydrogen peroxide, by decomposing the hydrogen peroxide. The waste liquid treatment device (20) is equipped with a housing (21), an introduction port (22) that is provided to the housing (21) and that introduces the water to be treated into the housing (21), a discharge port (23) that is provided to the housing (21) and that discharges treated water to be obtained by treating the water to be treated, and one or more channel-defining members (24) that are disposed within the housing (21) and that have a surface that a catalyst is disposed on, wherein the one or more channel-defining members (24) define, between the introduction port (22) and the discharge port (23), a channel (P) for the water to be treated, the channel (P) having a turning in at least one position.

Abstract: A waste liquid treatment device (20) treats water to be treated that contains at least hydrogen peroxide, by decomposing the hydrogen peroxide. The waste liquid treatment device (20) is equipped with a housing (21), an introduction port (22) that is provided to the housing (21) and that introduces the water to be treated into the housing (21), a discharge port (23) that is provided to the housing (21) and that discharges treated water to be obtained by treating the water to be treated, and one or more channel-defining members (24) that are disposed within the housing (21) and that have a surface that a catalyst is disposed on, wherein the one or more channel-defining members (24) define, between the introduction port (22) and the discharge port (23), a channel (P) for the water to be treated, the channel (P) having a turning in at least one position.

Abstract: The present invention provides a catalyst for hydrogen peroxide decomposition with which hydrogen peroxide present in acid-containing water to be treated can be efficiently decomposed at low cost and which is less apt to dissolve away in the water being treated, can be stably used over a long period, and renders acid recovery and recycling possible. The present invention has solved the problems with a catalyst for hydrogen peroxide decomposition which is for use in decomposing hydrogen peroxide present in acid-containing water to be treated, the catalyst including a base and, a catalyst layer that is amorphous, includes a platinum-group metal having catalytic function and a Group-6 element metal having catalytic function and is formed over the base.

Abstract: Disclosed herein is a liquid phase oxidation catalyst which comprises a metal substrate and an outectoid coating containing palladium and, molybdenum and/or tungsten coated on the substrate.According to the invention, the oxidation catalyst possessing excellent catalytic activity for oxidation which cannot be obtained by a catalyst prepared by means of pure palladium plating can be obtained. When palladium is compared with platinum, the cost of the latter is about four time larger than that of the former and the gravity of the latter is about two times larger than that of the former so that, if the same thickness of the metal is plated, the cost of the precious metal is advantageously reduced to about 1/8.Also disclosed is a process of preparing this oxidation catalyst.