Ni-Rh-based diesel reforming catalyst and preparation method and application thereof

A technology for reforming catalysts and diesel oil, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems such as unsuitable for mass production and low dispersion of active metals in Ni-Rh-based catalysts , achieve important market value and promotion value, improve micro-mixing efficiency, and improve mass transfer efficiency

Active Publication Date: 2021-01-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Ni-Rh-based catalysts synthesized by existing methods (sol-gel, adsorption hydrolysis precipitation, and stirring methods) still have problems such as low dispersion of active metals and are not suitable for macro-scale preparation.

Method used

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  • Ni-Rh-based diesel reforming catalyst and preparation method and application thereof
  • Ni-Rh-based diesel reforming catalyst and preparation method and application thereof
  • Ni-Rh-based diesel reforming catalyst and preparation method and application thereof

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preparation example Construction

[0027] The invention provides a kind of preparation method of Ni-Rh base diesel oil reforming catalyst, comprises the following steps:

[0028] In the membrane dispersion microreactor, the mixed salt solution of nickel salt, rhodium salt, cerium salt and zirconium salt enters the main channel of the membrane dispersion microreactor as the continuous phase, and the ammonia solution enters the membrane dispersion microreactor as the dispersed phase. After the microfiltration membrane of the microreactor is sheared, it is mixed with the continuous phase for co-precipitation reaction to obtain a slurry;

[0029] Aging and separating the slurry in sequence to obtain a catalyst precursor;

[0030] The catalyst precursor is sequentially dried, calcined and reduced to obtain a Ni-based diesel reforming catalyst;

[0031] In the nickel salt, rhodium salt, cerium salt and zirconium salt, the molar ratio of Ce to Zr is (1~9):1, the molar ratio of Ce to Ni is (1~10):1, and the molar rati...

Embodiment 1

[0055] Dissolve zirconium nitrate and cerium nitrate in water, stir and mix at normal temperature for 6h, add nickel nitrate and rhodium nitrate successively, continue stirring at normal temperature for 6h, obtain mixed salt solution (total ion concentration is 0.2mol / L, Ce:Zr:Ni: The Rh molar ratio is 42:14:15:1) and ammonia solution (0.2mol / L) were loaded into two Erlenmeyer flasks respectively, and the membrane dispersion microreactor was placed in a water bath at 40°C, and the mixed salt solution was used as The continuous phase enters the main channel (length 40mm, width, height 1mm), and the ammonia solution passes through the microfiltration membrane of the membrane dispersion microreactor as the dispersed phase (pore diameter 5 μm, open porosity ≤ 60%, size 3mm (length) × 1mm (width)) after shearing, and then mixed with the continuous phase in the main channel to carry out co-precipitation reaction; wherein, the flow rate of the continuous phase is within the range of 1...

Embodiment 2

[0059] Dissolve zirconium nitrate and cerium nitrate in water, stir and mix at normal temperature for 6h, add nickel nitrate and rhodium nitrate successively, continue stirring at normal temperature for 6h, obtain mixed salt solution (total ion concentration is 0.4mol / L, Ce:Zr:Ni: The Rh molar ratio is 42:14:15:1) and ammonia solution (0.4mol / L) were loaded into two Erlenmeyer flasks respectively, and the membrane dispersion microreactor was placed in a water bath at 40°C, and the mixed salt solution was used as The continuous phase enters the main channel (length 40mm, width, height 1mm), and the ammonia solution passes through the microfiltration membrane of the membrane dispersion microreactor as the dispersed phase (pore diameter 5 μm, open porosity ≤ 60%, size 3mm (length) × 1mm (width)) after shearing, then mixed with the continuous phase in the main channel, and carried out co-precipitation reaction for 20min; wherein, the flow rate of the continuous phase is 10mL / min, a...

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Abstract

The invention provides a Ni-Rh-based diesel reforming catalyst and a preparation method and application thereof, and belongs to the technical field of diesel reforming catalysts. According to the invention, the Ni-Rh-based catalyst is prepared by adopting the membrane dispersion microreactor to carry out coprecipitation reaction, and in the membrane dispersion microreactor, rapid and uniform mixing of hydroxide radicals in a dispersion phase and metal ions in a continuous phase is realized by virtue of cross-flow shearing of a microfiltration membrane on the dispersion phase so that the micromixing efficiency is improved, the mass transfer of hydroxide radicals and metal ions in the nucleation stage in the coprecipitation reaction process is enhanced, and the pH value of the reaction is more accurately controlled, the mass transfer efficiency is effectively improved, the dispersion degree of active metal (Ni-Rh alloy) is remarkably improved, meanwhile, Zr is more uniformly doped into CeO2 to form a cerium-zirconium solid solution, Ni-Rh alloy is more uniformly loaded on the cerium-zirconium solid solution carrier, the reaction time is shortened, the production efficiency is high, continuous production can be realized, and the catalyst has important market value and popularization value.

Description

technical field [0001] The invention relates to the technical field of diesel reforming catalysts, in particular to a Ni-Rh-based diesel reforming catalyst and its preparation method and application. Background technique [0002] Hydrogen energy is a secondary energy carrier with high calorific value, high-quality energy density, and zero pollution. It has attracted extensive attention from various countries in recent years. Existing hydrogen production methods include thermochemical methods and electrochemical methods. Fuel cells (such as solid oxide fuel cells, proton exchange membrane fuel cells) gradually account for more hydrogen consumption share. At present, the storage and transportation of hydrogen is still a bottleneck that needs to be broken through. Realizing the immediate production and use of hydrogen may be an effective solution to this problem. Diesel is a liquid fuel with high volume energy density, which is easy to store and transport. The hydrogen-rich ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/03C01B3/32
CPCB01J23/894B01J37/031C01B3/32C01B2203/0227C01B2203/1058C01B2203/1082
Inventor 王玉军薛强强颜彬航
Owner TSINGHUA UNIV
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