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Aluminum-plated metal carrier dehydrogenation catalyst and preparation method thereof

A technology of metal carrier and catalyst, which is applied in the field of aluminized metal carrier dehydrogenation catalyst and its preparation, can solve the problems of low bonding degree between the catalyst layer and the metal carrier layer, small specific surface area of ​​the metal carrier, poor catalyst dispersion, etc., and achieve Effects of optimized preparation method, reduced number of coating or impregnation times, and low cost

Active Publication Date: 2012-09-12
中国船舶集团有限公司第七一八研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such catalysts have high hydrogen removal efficiency, but these metal supported catalysts also have some disadvantages
Since the surface of the metal carrier is non-porous and relatively smooth, it is not easy to support the catalyst layer, and the expansion coefficient of the catalyst layer and the metal carrier does not match, resulting in a low degree of bonding between the catalyst layer and the metal carrier layer, which is easy to fall off; the specific surface area of ​​the metal carrier is small, and it is not easy to The catalyst is adsorbed, and the dispersion of the catalyst on the surface of the metal carrier is not good, so the catalyst needs to be coated multiple times to achieve the required amount of catalyst to achieve better activity, resulting in complex preparation process and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 5 pieces of 30×30mm aluminum-coated steel mesh, each piece of metal mesh is 0.6mm thick and weighs 2g, fully washed with detergent, baked at 120°C for 4 hours, and then use 2mol / l phosphoric acid as the electrolyte , graphite as the cathode, anodic oxidation of aluminum-coated expanded metal, the oxidation time is 2 hours, the voltage is 80V, the temperature is room temperature, and the current density is 3A. In order to make the oxidation effect of both sides of the aluminum-coated expanded metal the same, the double-cathode method is used for oxidation ; put the anodized aluminum-plated expanded metal into the mixed solution of phosphoric acid, chromic acid and deionized water, wherein the mass ratio of each component in the mixed solution is phosphoric acid: chromic acid: deionized water=1:3: 46. ​​Corrosion and reaming were performed at room temperature to form pits on the surface of the mildly oxidized aluminum-coated steel mesh, and then ultrasonically cleaned...

Embodiment 2

[0032] Take 5 pieces of 30×30mm aluminum-plated steel mesh, each piece of metal mesh is 0.6mm thick and weighs 2g, fully washed with detergent, baked at 100°C for 6 hours, and then use 2mol / l phosphoric acid as the electrolyte , graphite as the cathode, anodic oxidation of aluminum-coated expanded metal, the oxidation time is 2 hours, the voltage is 80V, the temperature is room temperature, and the current density is 3A. In order to make the oxidation effect of both sides of the aluminum-coated expanded metal the same, the double-cathode method is used for oxidation ; put the anodized aluminum-plated expanded metal into the mixed solution of phosphoric acid, chromic acid and deionized water, wherein the mass ratio of each component in the mixed solution is phosphoric acid: chromic acid: deionized water=1:3: 46. ​​Corrosion and reaming were performed at room temperature to form pits on the surface of the mildly oxidized aluminum-coated steel mesh, and then ultrasonically cleaned...

Embodiment 3

[0036] Take 5 pieces of 30×30mm aluminum-coated steel mesh, each piece of metal mesh is 0.6mm thick and weighs 2g, fully washed with detergent, baked at 80°C for 6 hours, and then use 2mol / l phosphoric acid as the electrolyte , graphite as the cathode, anodic oxidation of aluminum-coated expanded metal, the oxidation time is 2 hours, the voltage is 80V, the temperature is room temperature, and the current density is 3A. In order to make the oxidation effect of both sides of the aluminum-coated expanded metal the same, the double-cathode method is used for oxidation ; put the anodized aluminum-plated expanded metal into the mixed solution of phosphoric acid, chromic acid and deionized water, wherein the mass ratio of each component in the mixed solution is phosphoric acid: chromic acid: deionized water=1:3: 46. ​​Corrosion and reaming were performed at room temperature to form pits on the surface of the mildly oxidized aluminum-coated steel mesh, and then ultrasonically cleaned ...

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Abstract

The invention discloses an aluminum-plated metal carrier dehydrogenation catalyst and a preparation method thereof, which belong to the field of catalyst applications. The catalyst consist of a metal carrier layer, a gamma-Al2O3 porous material layer and a catalyst layer, wherein the metal carrier layer is made of an aluminum-plated steel plate or aluminum-plated alloy; and the catalyst layer consists of a precious metal and / or aid with catalytic activity. The preparation method comprises the following steps of: cleaning and drying the metal carrier layer; completely converting an aluminum-plated layer into Al2O3 through anodic oxidation; corroding and broaching; coating or dipping a layer of active Al2O3 on the surface of the broached Al2O3; drying and sintering to obtain a gamma-Al2O3 porous material layer; coating or dipping a catalyst layer; and drying, baking and reducing to obtain the aluminum-plated metal carrier dehydrogenation catalyst. In the catalyst, the bonding strength between the catalyst layer and the metal carrier is high, and the activity of the catalyst layer is high; and the preparation method is simple, and is low in cost.

Description

technical field [0001] The invention relates to an aluminized metal carrier hydrogen elimination catalyst and a preparation method thereof, in particular to a catalyst used for passive elimination of hydrogen in nuclear power plants and a preparation method thereof, belonging to the field of catalyst application. Background technique [0002] After a loss of water accident (LOCA) in a pressurized water reactor in a nuclear power plant, due to the loss of coolant and the failure of emergency backup coolant injection, the fuel temperature increased sharply, resulting in a high-temperature reaction between the residual steam in the main system and the zirconium in the fuel shell. Under severe accident conditions, the fuel casing may be completely oxidized, which is an exothermic reaction and produces large amounts of hydrogen gas. The hydrogen gas produced by this reaction enters the reactor containment environment from the main system damage along with the steam. In addition,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/66B01J35/10B01J37/025G21C9/06
CPCY02E30/30
Inventor 朱敏赵文江陶志勇李琳徐月
Owner 中国船舶集团有限公司第七一八研究所
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