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Catalyst for hydrogen production from methane steam reforming and preparation method and application thereof

A methane water vapor, reforming hydrogen production technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of affecting the activity and stability of methane water vapor and other problems, to achieve the effects of inhibiting the formation of sintering and carbon deposits, increasing surface oxygen vacancies, and increasing efficiency

Inactive Publication Date: 2020-11-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of preactivation treatment directly affects the activity and stability of methane steam reforming

Method used

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  • Catalyst for hydrogen production from methane steam reforming and preparation method and application thereof
  • Catalyst for hydrogen production from methane steam reforming and preparation method and application thereof
  • Catalyst for hydrogen production from methane steam reforming and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] (1) Preparation of catalyst

[0042] In this specific embodiment, a catalyst in which nickel oxide is supported on a cerium oxide carrier is prepared. The cerium oxide carrier is in the form of nanoparticles and nanorods respectively, and the cerium oxide carrier is doped or not doped with praseodymium. The Ni loading in the final catalyst was 10% based on the total mass of the catalyst. The prepared catalyst is dried, roasted, pressed into tablets and sieved, and packed into a fixed bed. The purity of the chemical reagents described in the present invention are all analytical pure.

Embodiment 1

[0046] Embodiment 1: the preparation of NiO / CePrO catalyst

[0047] The preparation method of the catalyst in Example 1 is similar to that of the comparative example catalyst, except that 1.67 grams of praseodymium nitrate hexahydrate were added simultaneously in the step (1), and the doping of praseodymium in the prepared NiO / CePrO catalyst The impurities are 20%. Wherein, the preparation of the NiO / CePrO catalyst sample of other praseodymium doping amounts is basically the same as this embodiment, only the quality of the praseodymium nitrate hexahydrate added is slightly adjusted, and the present invention adjusts the nitric acid hexahydrate added between 1.67-6.7 grams According to the quality of praseodymium, NiO / CePrO catalysts with different doping amounts were obtained.

Embodiment 2

[0048] Example 2: NiO / CeO 2 - Preparation of Rod catalyst

[0049] (1) The cerium nitrate hexahydrate that takes by weighing 1.74g is dissolved in the water of 5ml, the sodium hydroxide that takes by weighing 19.2g is dissolved in the water of 20ml, then both are mixed, then add the water of 15ml again, mix and stir 30min, will The homogeneously stirred solution was transferred to a 100ml hydrothermal crystallization kettle, and kept at 100°C for 24h for crystallization. After the crystallization is completed, filter and wash with deionized water until neutral, collect the solid, dry the solid at 80°C for 12 hours, and then place it in a muffle furnace for 4 hours, and the final solid powder is cerium oxide The nanorods are denoted as CeO 2 -Rod, Rod means that the catalyst has a rod-like structure.

[0050] (2) Weigh 1.483g of nickel nitrate hexahydrate, make a solution of 1.5ml, weigh 2.7g of CeO 2 -Rod carrier, add the configured nickel nitrate hexahydrate solution drop...

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Abstract

The invention discloses a catalyst for hydrogen production from methane steam reforming. A carrier of the catalyst is cerium oxide existing in a form of a nanorod; an active component comprises nickeloxide nanoparticles located on the carrier; and the load capacity of Ni is 0.1-40% based on total mass of the catalyst. Furthermore, the catalyst is also doped with praseodymium (Pr), and the dopingamount of the Pr in the catalyst is 0-50%. According to the preparation method, oxygen vacancies on the surface of the catalyst are increased by adopting carrier shape control and doping means; the shape of the carrier is controlled through preparing a cerium oxide nanorod, so as to increase the oxygen vacancies on the surface of the catalyst; the oxygen vacancies on the surface of the catalyst are further increased by doping an element Pr into the cerium oxide nanorod carrier; and abundant oxygen vacancies on the carrier are beneficial to activation and dissociation of raw water, so as to improve the activity and stability of methane steam reforming. The method is simple, and extremely low in cost, the process risk is reduced, the process flow is reduced, and energy consumption and fundsfor methane steam reforming transformation are reduced, so that the efficiency of hydrogen production from methane steam reforming is improved.

Description

technical field [0001] The invention belongs to the field of hydrogen production by steam reforming of methane, and in particular relates to a catalyst for hydrogen production by steam reforming of methane, a preparation method and application thereof. Background technique [0002] Fossil energy, including coal, oil, and natural gas, can provide a solid foundation for the development of human society. However, the inherent defects of fossil energy include that its resources are limited, non-renewable, and produce a large amount of toxic and harmful substances after use. of waste. Therefore, the development of clean and pollution-free new energy is a major issue that needs to be solved urgently. Hydrogen energy is a clean, efficient, and pollution-free green energy. It has attracted people's attention because of its large combustion calorific value, high fuel efficiency, and the combustion products are water-free and recyclable. In addition, hydrogen can be utilized in vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C01B3/40
CPCB01J23/83C01B3/40Y02P20/52
Inventor 李国柱肖周荣张香文王涖刘国柱
Owner TIANJIN UNIV
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