Dehydrogenation catalyst taking Fe-Cr-Al alloy as metal carrier and preparation method thereof

Abstract

The invention discloses a dehydrogenation catalyst taking a Fe-Cr-Al alloy as a metal carrier and a preparation method thereof, which belong to the field of catalysts. The catalyst consists of a metal carrier layer, a gamma-Al2O3 porous material layer and a catalyst layer, wherein the metal carrier layer is made of a Fe-Cr-Al alloy; and the catalyst layer consists of a precious metal and / or aid with catalytic activity. The preparation method comprises the following steps of: calcining the Fe-Cr-Al alloy to till A1 in the alloy leaks out and is oxidized into Al2O3; 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 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 a hydrogen elimination catalyst with a Fe-Cr-Al alloy as a metal carrier 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, the radiation decomposition of water and the reaction between core melt and concrete will also produce a large ...

Examples

Embodiment 1

[0027] Take 5 pieces of 30×30mm Fe-Cr-Al alloy expanded metal, each piece of metal mesh is 0.6mm thick and weighs 2g, calcined at 950°C for 15 hours, and then put in a mixture of phosphoric acid, chromic acid and deionized water In the liquid, wherein, the mass ratio of each component in the mixed liquid is phosphoric acid: chromic acid: deionized water = 1:3:46, and the Fe-Cr-Al alloy plate is corroded and expanded at room temperature to make the surface mildly oxidized Dimples were formed on the surface of the mesh, which were then ultrasonically cleaned three times in deionized water and then dried at 120 °C; 2 o 3 The surface is coated with a layer of active Al 2 o 3 Sol, baked at 120°C for 2 hours, and fired at 450°C for 3 hours, the obtained γ-Al 2 o 3 The thickness of the porous material layer is 50 μm, and it is placed in a drying oven for use.

[0028] Measure the concentration of 0.1gPd / ml of H 2 PdCl 4 Solution 5ml, 0.1gPt / ml of H 2 PtCl 6 10ml of the solut...

Embodiment 2

[0031]Take 5 pieces of 30×30mm Fe-Cr-Al alloy expanded metal, each piece of metal mesh is 0.6mm thick and weighs 2g, calcined at 1000°C for 10 hours, and then put in a mixture of phosphoric acid, chromic acid and deionized water In the liquid, wherein, the mass ratio of each component in the mixed liquid is phosphoric acid: chromic acid: deionized water = 1:3:46, and the Fe-Cr-Al alloy plate is corroded and expanded at room temperature to make the surface mildly oxidized Dimples were formed on the surface of the mesh, which were then ultrasonically cleaned three times in deionized water and then dried at 120 °C; 2 o 3 The surface is impregnated with a layer of active Al 2 o 3 The sol was baked at 100°C for 3 hours and fired at 500°C for 2.5 hours to obtain γ-Al 2 o 3 The thickness of the porous material layer is 50 μm, and it is placed in a drying oven for use.

[0032] Measure the concentration of 0.1gPd / ml of H 2 PdCl 4 Solution 5ml, 0.1gPt / ml of H 2 PtCl 6 Solution...

Embodiment 3

[0035] Take 5 pieces of 30×30mm Fe-Cr-Al alloy expanded metal, each piece of metal mesh is 0.6mm thick and weighs 2g, calcined at 1050°C for 9 hours, and then put in a mixture of phosphoric acid, chromic acid and deionized water In the liquid, wherein, the mass ratio of each component in the mixed liquid is phosphoric acid: chromic acid: deionized water = 1:3:46, and the Fe-Cr-Al alloy plate is corroded and expanded at room temperature to make the surface mildly oxidized Dimples were formed on the surface of the mesh, which were then ultrasonically cleaned three times in deionized water and then dried at 120 °C; 2 o 3 The surface is coated with a layer of active Al 2 o 3 sol, baked at 80°C for 5 hours, and fired at 400°C for 4 hours, the obtained γ-Al 2 o 3 The thickness of the porous material layer is 50 μm, and it is placed in a drying oven for use.

[0036] Measure the concentration of 0.12gPd / ml H 2 PdCl 4 Solution 3ml, 0.07gPt / ml of H 2 PtCl 6 Solution 2ml and 0....

technical field

[0001] The invention relates to a hydrogen elimination catalyst with a Fe-Cr-Al alloy as a metal carrier 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, the radiation decomposition of water and the reaction between core melt and concrete will also produce a large ...

Examples

Embodiment 1

[0027] Take 5 pieces of 30×30mm Fe-Cr-Al alloy expanded metal, each piece of metal mesh is 0.6mm thick and weighs 2g, calcined at 950°C for 15 hours, and then put in a mixture of phosphoric acid, chromic acid and deionized water In the liquid, wherein, the mass ratio of each component in the mixed liquid is phosphoric acid: chromic acid: deionized water = 1:3:46, and the Fe-Cr-Al alloy plate is corroded and expanded at room temperature to make the surface mildly oxidized Dimples were formed on the surface of the mesh, which were then ultrasonically cleaned three times in deionized water and then dried at 120 °C; 2 o 3 The surface is coated with a layer of active Al 2 o 3 Sol, baked at 120°C for 2 hours, and fired at 450°C for 3 hours, the obtained γ-Al 2 o 3 The thickness of the porous material layer is 50 μm, and it is placed in a drying oven for use.

[0028] Measure the concentration of 0.1gPd / ml of H 2 PdCl 4 Solution 5ml, 0.1gPt / ml of H 2 PtCl 6 10ml of the solut...

Embodiment 2

[0031]Take 5 pieces of 30×30mm Fe-Cr-Al alloy expanded metal, each piece of metal mesh is 0.6mm thick and weighs 2g, calcined at 1000°C for 10 hours, and then put in a mixture of phosphoric acid, chromic acid and deionized water In the liquid, wherein, the mass ratio of each component in the mixed liquid is phosphoric acid: chromic acid: deionized water = 1:3:46, and the Fe-Cr-Al alloy plate is corroded and expanded at room temperature to make the surface mildly oxidized Dimples were formed on the surface of the mesh, which were then ultrasonically cleaned three times in deionized water and then dried at 120 °C; 2 o 3 The surface is impregnated with a layer of active Al 2 o 3 The sol was baked at 100°C for 3 hours and fired at 500°C for 2.5 hours to obtain γ-Al 2 o 3 The thickness of the porous material layer is 50 μm, and it is placed in a drying oven for use.

[0032] Measure the concentration of 0.1gPd / ml of H 2 PdCl 4 Solution 5ml, 0.1gPt / ml of H 2 PtCl 6 Solution...

Embodiment 3

[0035] Take 5 pieces of 30×30mm Fe-Cr-Al alloy expanded metal, each piece of metal mesh is 0.6mm thick and weighs 2g, calcined at 1050°C for 9 hours, and then put in a mixture of phosphoric acid, chromic acid and deionized water In the liquid, wherein, the mass ratio of each component in the mixed liquid is phosphoric acid: chromic acid: deionized water = 1:3:46, and the Fe-Cr-Al alloy plate is corroded and expanded at room temperature to make the surface mildly oxidized Dimples were formed on the surface of the mesh, which were then ultrasonically cleaned three times in deionized water and then dried at 120 °C; 2 o 3 The surface is coated with a layer of active Al 2 o 3 sol, baked at 80°C for 5 hours, and fired at 400°C for 4 hours, the obtained γ-Al 2 o 3 The thickness of the porous material layer is 50 μm, and it is placed in a drying oven for use.

[0036] Measure the concentration of 0.12gPd / ml H 2 PdCl 4 Solution 3ml, 0.07gPt / ml of H 2 PtCl 6 Solution 2ml and 0....