Preparation method and application of cerium oxide loaded nickel catalyst

A technology of cerium oxide and nickel loading, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the problem of easy carbon deposition and deactivation on the catalyst surface, and reaction selectivity No high problems, to achieve the effect of inhibiting the formation of carbon deposits, enhancing the catalytic effect, and enriching the active sites

Inactive Publication Date: 2020-07-10
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the reaction selectivity of the nickel-based catalyst used in the hydrogen production process of ethanol steam reforming is not high, and the surface of the catalyst is prone to carbon deposition and deactivation, the invention develops a citric acid-assisted sol-gel method to prepare cerium oxide-loaded Ni, And rare earth elements La, Pr, Zr, Tb doped ceria support Ni for efficient hydrogen production in ethanol steam reforming

Method used

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  • Preparation method and application of cerium oxide loaded nickel catalyst
  • Preparation method and application of cerium oxide loaded nickel catalyst
  • Preparation method and application of cerium oxide loaded nickel catalyst

Examples

Experimental program
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Embodiment 1

[0031] Weigh cerium nitrate hexahydrate, nickel nitrate, and citric acid, mix and dissolve in 17ml of water, stir at 60°C until clear, then transfer to a water bath at 90°C to evaporate the water to form a gel, and then transfer to an oven at 120°C Dry in medium for 24 hours to form a solid foam, put it in a muffle furnace at 600°C and bake for 4 hours after grinding to obtain nickel oxide supported by a cerium oxide carrier, and then in H 2 / Ar mixed gas pretreatment at 500 ° C for 1 hour, named Ni-CeO 2 , the loading of Ni in the final catalyst is 10wt%.

Embodiment 2

[0033] Weigh cerium nitrate hexahydrate, nickel nitrate, lanthanum nitrate hexahydrate, and citric acid, mix and dissolve in 17ml of water, stir at 60°C until clear, then transfer to a water bath at 90°C to evaporate the water to form a gel, then transfer Dried in an oven at 120°C for 24 hours to form a solid foam, then ground and baked in a muffle furnace at 600°C for 4 hours to obtain rare earth (La, Pr, Zr, Tb)-doped nickel oxide supported on a cerium oxide carrier , then in H 2 / Ar mixed gas pretreatment at 500°C for 1 hour, named Ni-CeLa, the loading of Ni in the final catalyst was 10wt%, and the molar ratio of cerium to rare earth elements was 4.

Embodiment 3-5

[0035] The preparation process of the catalyst is the same as in Example 2, except that lanthanum nitrate hexahydrate is replaced by nitric acid hexahydrate, nitric acid hexahydrate, and nitric acid hexahydrate successively, and the catalysts obtained are named as Ni-CePr, Ni-CeZr, and Ni-CeTb successively. The loading amount of Ni in the final catalyst is 10wt%, and the molar ratio of cerium element to rare earth element is 4.

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Abstract

The invention discloses a preparation method of a cerium oxide loaded nickel catalyst. Cerium oxide serves as a carrier and nickel serves as an active component. The method includes: weighing cerium nitrate hexahydrate, nickel nitrate and citric acid, performing stirring, mixing and dissolving in water, then evaporating water to form a gel, and performing drying to obtain solid foam, grinding thesolid foam, performing roasting, and conducting cooling to obtain cerium oxide loaded nickel oxide, and performing reduction to obtain the cerium oxide loaded nickel catalyst. The invention also discloses a preparation method of a rare earth element doped cerium oxide loaded nickel catalyst and application of the two catalysts in hydrogen production from ethanol vapor. The catalysts prepared according to the invention can efficiently convert ethanol under the conditions of high ethanol feed, a low water-carbon ratio and a low reaction temperature, and can achieve stable hydrogen prodution. Thehydrogen production by ethanol steam reforming can achieve efficient hydrogen production under the conditions of low temperature, low water-carbon ratio and high ethanol feed.

Description

technical field [0001] The invention belongs to the field of hydrogen production from ethanol water vapor, and in particular relates to a preparation method of a cerium oxide-supported nickel catalyst, a preparation method of a cerium oxide-supported nickel catalyst doped with rare earth elements, and the use of the two catalysts for hydrogen production from ethanol water vapor. Background technique [0002] Hydrogen energy is regarded as an ideal clean energy due to its high energy density and non-polluting characteristics, which has attracted widespread attention. Hydrogen production by steam reforming of ethanol is a practical and feasible method for obtaining hydrogen energy. Ethanol reforming hydrogen production has very broad application prospects, and its uniqueness comes from: 1. Ethanol has a wide range of sources, and the raw materials for preparing ethanol are renewable; 2. Ethanol is non-toxic and appears liquid at normal temperature and pressure, which is conven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C01B3/32B01J37/08B01J37/00
CPCB01J23/002B01J23/83C01B3/326B01J37/0018B01J37/088C01B2203/0227C01B2203/1058C01B2203/1041C01B2203/1082C01B2203/1229B01J2523/00B01J2523/3706B01J2523/3712B01J2523/847B01J2523/3718B01J2523/3756B01J2523/48
Inventor 李国柱张香文肖周荣王涖邹吉军
Owner TIANJIN UNIV
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