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Preparation method of multi-component catalyst, multi-component catalyst and application of multi-component catalyst

A catalyst and multi-component technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of no multi-component

Active Publication Date: 2022-07-05
陕西氢易能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above problems, the present invention provides a method for preparing a multi-component catalyst, which improves the stability, conversion rate and selectivity of the multi-component catalyst, and effectively solves the current hydrogen storage problem for azacyclic aromatic hydrocarbons in organic liquids. Supported hydrogenation and dehydrogenation catalysts do not have the problem of multi-component (≥3) catalysts

Method used

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  • Preparation method of multi-component catalyst, multi-component catalyst and application of multi-component catalyst

Examples

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preparation example Construction

[0033] In a first aspect, the present invention provides a method for preparing a multicomponent catalyst, the specific method comprising:

[0034] Step S1: prepare a polyacrylonitrile DMF solution, add a nitrogen-containing organic pore-forming agent to the polyacrylonitrile DMF solution, and obtain nanofibers by electrospinning; wherein, the polyacrylonitrile DMF solution is polyacrylonitrile The solution obtained after dissolving in DMF;

[0035] Step S2: calcining the nanofibers at a low temperature and then calcining at a high temperature to obtain an irregularly agglomerated carrier; wherein the temperature of the low-temperature calcination is 190°C-240°C, and the temperature of the high-temperature calcination is 600°C -900℃;

[0036] Step S3: ball-milling the carrier and the mixed metal salt and then calcining to obtain the multi-component catalyst; wherein the re-calcining temperature is 300°C-500°C;

[0037] Wherein, the types of metal elements in the mixed metal ...

Embodiment 1

[0064] Example 1 (experimental group)

[0065] 10 mL of a polyacrylonitrile DMF solution with a mass fraction of 8% was prepared, and 0.5 g of melamine was added to the solution after it was completely dissolved. After stirring evenly, the mixed solution was spun to obtain nanofibers by electrospinning at a voltage of 12.5 kV and a current of 2 mA. The obtained nanofibers were heated to 190°C at a rate of 2°C per minute, calcined in air for 3 hours, then replaced with nitrogen, and heated to 900°C at a rate of 5°C per minute, maintained for 2 hours, and then cooled to room temperature naturally. . The obtained carrier and palladium acetylacetonate, platinum acetylacetonate, ruthenium acetylacetonate, rhodium acetylacetonate are put into the ball mill tank pre-equipped with agate grinding balls, and its total metal mass fraction is 10wt% of the carrier, Pd:Ru: The ratio of Pt:Rh is 1.5:1:1:1, and the ball mill jar is sealed after filling with nitrogen and emptying the air. T...

Embodiment 2

[0067] Example 2 (control group of Example 1)

[0068] This example is a comparative example of Example 1, and the difference between its preparation steps and Example 1 is that in this example, a conventional method is used to mix the multi-component metals (that is, adding the mixed metal salt to the carrier dispersion and stirring and ultrasonically dispersed evenly), the specific steps are as follows:

[0069] 10 mL of a polyacrylonitrile DMF solution with a mass fraction of 8% was prepared, and 0.5 g of melamine was added to the solution after it was completely dissolved. After stirring evenly, the mixed solution was spun to obtain nanofibers by electrospinning at a voltage of 12.5 kV and a current of 2 mA. The obtained nanofibers were heated to 190°C at a rate of 2°C per minute, calcined in air for 3 hours, then replaced with nitrogen, and heated to 900°C at a rate of 5°C per minute, maintained for 2 hours, and then cooled to room temperature naturally. . Disperse the...

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Abstract

The invention provides a preparation method of a multi-component catalyst, the multi-component catalyst and application of the multi-component catalyst, and the preparation method of the multi-component catalyst comprises the following steps: step 1, preparing a polyacrylonitrile DMF solution, adding a nitrogen-containing organic pore-forming agent into the polyacrylonitrile DMF solution, and obtaining nanofibers by adopting an electrostatic spinning method; step 2, carrying out low-temperature roasting on the nanofiber, and then carrying out high-temperature roasting treatment to obtain an irregular caked carrier; 3, the carrier and the mixed metal salt are subjected to ball milling and then roasted, and the multi-component catalyst is obtained, wherein the variety of metal elements in the mixed metal salt is not less than four, and by adopting the preparation method disclosed by the invention, multi-component metals are combined together without using a surfactant, and the multi-component catalyst with relatively good activity, high conversion rate and high selectivity can be obtained; and the obtained multi-component catalyst can be used in hydrogenation and dehydrogenation reaction processes of a nitrogen heterocyclic organic liquid hydrogen storage carrier.

Description

technical field [0001] The invention relates to an organic liquid hydrogen storage technology, and mainly relates to a preparation method of a multi-component catalyst, a multi-component catalyst and an application thereof. Background technique [0002] Hydrogen storage technology has always been a bottleneck in the development of hydrogen energy applications. At present, the commercial hydrogen storage methods mainly include high-pressure gaseous hydrogen storage and low-temperature liquefied hydrogen storage. Both of these two hydrogen storage methods have obvious disadvantages: the storage equipment is expensive, the use environment and conditions are harsh, and the hydrogen loss during use is high. , the safety factor is low, the accident risk is high, the construction of large-scale infrastructure is expensive, and the distribution and transportation are difficult. In this context, organic liquid hydrogen storage technology is proposed as a new type of hydrogen storage...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/89C01B3/00C07D209/86
CPCB01J23/464B01J23/8993C01B3/0015C07D209/86Y02P20/52
Inventor 王斯瑶王斌方涛
Owner 陕西氢易能源科技有限公司
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