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A kind of ni-rh base diesel oil reforming catalyst and its preparation method and application

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

Active Publication Date: 2021-08-31
TSINGHUA UNIV
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  • Summary
  • 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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  • A kind of ni-rh base diesel oil reforming catalyst and its preparation method and application
  • A kind of ni-rh base diesel oil reforming catalyst and its preparation method and application
  • A kind of ni-rh base diesel oil reforming catalyst and its preparation method and application

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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 its preparation method and application, belonging to the technical field of diesel reforming catalysts. The present invention adopts membrane dispersion micro-reactor to carry out co-precipitation reaction to prepare Ni-Rh based catalyst, and in membrane dispersion micro-reactor, the cross-flow shearing of dispersed phase by microfiltration membrane realizes the hydroxide in the dispersed phase and the continuous phase The rapid and uniform mixing of metal ions improves the microscopic mixing efficiency, which is conducive to strengthening the mass transfer between hydroxide and metal ions in the nucleation stage of the co-precipitation reaction, and more accurately controls the pH value of the reaction, thus effectively improving the mass transfer efficiency , significantly improved the dispersion of active metals (Ni‑Rh alloys), and at the same time made Zr more uniformly doped in CeO 2 The cerium-zirconium solid solution is formed in the medium, and the Ni-Rh alloy is more uniformly loaded on the cerium-zirconium solid solution carrier, which shortens the reaction time, improves production efficiency, and can realize continuous production, which has important market value and promotion 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 Patents(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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