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Catalyst for methane steam reforming in fuel cell

A fuel cell and steam reforming technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unstable catalyst structure, poor activity stability, low activity rate, etc.

Active Publication Date: 2018-06-08
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the activity rate is low, and it has high stability to alkali metal ions
The catalyst of this patent is prepared by the precipitation method. The structure of the prepared catalyst is unstable, and the strength and specific surface decrease rapidly after reduction. As the catalyst strength and specific surface decrease, the catalyst activity decreases rapidly, resulting in poor activity stability.

Method used

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  • Catalyst for methane steam reforming in fuel cell
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  • Catalyst for methane steam reforming in fuel cell

Examples

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Effect test

Embodiment 1

[0047] Catalysts for steam reforming of methane in molten carbonate fuel cells, including regular granular supports made of oxides of aluminum, zirconium and lanthanum (rare earth elements), then loaded with oxides of nickel, and finally formed with nickel, Regular granular catalyst formed from oxides of aluminum, zirconium and lanthanum (rare earth elements). The average pore diameter of the catalyst is 200-500Å, the pore volume is 0.2-0.5ml / g, and the specific surface area is greater than 45 m 2 / g, the loss on ignition at 900°C is less than 5%. The catalyst includes the following components in mass percentage: 37% of nickel oxide, 48% of aluminum oxide, 10% of zirconia, and 5% of lanthanum oxide (rare earth element). The granular catalyst is a cylindrical granular catalyst with a diameter of 1 mm and a height of 0.5 mm.

[0048] Wherein the raw materials of alumina, zirconia, lanthanum oxide and nickel oxide are alumina powder, zirconia powder, lanthanum oxide (rare earth...

Embodiment 2

[0057] Catalysts for steam reforming of methane in molten carbonate fuel cells, including regular granular supports made of oxides of aluminum, zirconium and lanthanum (rare earth elements), then loaded with oxides of nickel, and finally formed with nickel, Regular granular catalyst formed from oxides of aluminum, zirconium and lanthanum (rare earth elements). The average pore diameter of the catalyst is 200-500Å, the pore volume is 0.2-0.5ml / g, the specific surface area is greater than 45m2 / g, and the weight loss on ignition at 900°C is less than 5%.

[0058] The raw materials of alumina, zirconia, lanthanum oxide (rare earth element) and nickel oxide are alumina powder, zirconia powder, lanthanum oxide (rare earth element) powder and nickel nitrate solution, and the concentration of nickel nitrate solution is 0.1mol / L.

[0059] The preparation method is as described in Example 1, wherein the catalyst includes the following components in mass percentage: 42% nickel oxide, 42%...

Embodiment 3

[0062] Catalysts for steam reforming of methane in molten carbonate fuel cells, including regular granular supports made of oxides of aluminum, zirconium and lanthanum (rare earth elements), then loaded with oxides of nickel, and finally formed with nickel, Regular granular catalyst formed from oxides of aluminum, zirconium and lanthanum (rare earth elements). The average pore diameter of the catalyst is 200-500Å, the pore volume is 0.2-0.5ml / g, and the specific surface area is greater than 45m 2 / g, the loss on ignition at 900°C is less than 5%.

[0063] The raw materials of alumina, zirconia, lanthanum oxide (rare earth element) and nickel oxide are alumina powder, zirconia powder, lanthanum oxide (rare earth element) powder and nickel nitrate solution, the concentration of nickel nitrate solution is 0.5mol / L.

[0064] The preparation method is as in Example 1, wherein the catalyst includes the following components in mass percentage: 40% nickel oxide, 46% aluminum oxide, 9...

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a catalyst used in a fuel cell and especially used for methane steam reforming in a molten carbonate fuel cell. The catalyst is characterized by being prepared by a structured granular carrier prepared from oxides of aluminum, zirconium and lanthanum, wherein the structured granular carrier is loaded with oxideof nickel so as to finally form the structured granular catalyst prepared from the oxides of the nickel, the aluminum, the zirconium and the lanthanum. The catalyst provided by the invention is largein pore diameter and stable in pore structure; with large pore diameter, the catalyst cannot be easily blocked by alkali metal of an electrolyte, an active channel of reforming reaction can be continuously provided; the aluminum, the lanthanum (rare earth elements) and zirconium are acted jointly, so that carrier crystal particles are staggered, an active center is increased, and the overall activity of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst used in fuel cells, especially methane steam reforming in molten carbonate fuel cells. Background technique [0002] A molten carbonate fuel cell ("MCFC") is a high temperature fuel cell that generates electricity through an electrochemical reaction between a cathode, an anode, and an electrolyte mother plate between the cathode and anode. In this type of battery, a molten eutectic (such as a molten eutectic composed of lithium carbonate and potassium carbonate) impregnated in a carrier material (such as a film carrier composed of LiAlO2 / Al2O3) is used as a electrolyte. The hydrogen required for fuel cell operation is produced directly in the cell via the methane steam reforming reaction. The steam reforming reaction of methane is shown in the following example: CH4+H2O→CO+3H2 (1) CO+H2O→CO2+H2 (2) The first reaction is strongly endothermic and can be d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9025Y02E60/50
Inventor 华波麦景红刘阳曾斌谢昊彭国建刘卫东杜勇古岚郭游博
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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