CN-119793449-B - Dehydrogenation catalyst and preparation method and application thereof

Abstract

The application discloses a dehydrogenation catalyst and a preparation method and application thereof, and relates to the field of dehydrogenation catalysts, comprising the following steps of taking a carrier, carrying out plasma pretreatment through reaction gas to obtain a pretreated carrier, and loading noble metal on the pretreated carrier to obtain the dehydrogenation catalyst; the reactive gas includes one or more of an oxidizing gas, a reducing gas, and a neutral gas. The application prepares the dehydrogenation catalyst by carrying out plasma treatment on the carrier and then loading noble metal, and improves the cycle stability of dehydrogenation reaction when the dehydrogenation catalyst is applied to the organic liquid hydrogen storage material.

Inventors

• DING YINGJIE
• YANG MING
• DONG YUAN

Assignees

• 中国地质大学（武汉）

Dates

Publication Date

20260508

Application Date

20241227

Claims (7)

1. 1. The preparation method of the dehydrogenation catalyst of the organic liquid hydrogen storage material is characterized by comprising the following steps of taking a carrier, carrying out plasma pretreatment on the carrier through reaction gas to obtain a pretreated carrier, and loading noble metal on the pretreated carrier to obtain the dehydrogenation catalyst; The reaction gas includes an oxidizing gas; the carrier is an activated carbon nanotube, and the activated carbon nanotube is prepared by mixing and stirring the carbon nanotube, alkali and water, drying, then placing in an inert gas atmosphere, treating at 750-850 ℃, neutralizing with acid, washing with water to be neutral, drying and grinding; the plasma pretreatment comprises the steps of ionizing a reaction gas into plasma to react with the carrier, wherein the flow rate of the reaction gas is 5-15mL/min, and the ionization voltage is 80-120V.
2. 2. The method for preparing a dehydrogenation catalyst for an organic liquid hydrogen storage material according to claim 1, characterized in that the noble metal loading comprises the step of mixing the pretreatment carrier with a precursor and then performing high-temperature treatment.
3. 3. The method for preparing a dehydrogenation catalyst for an organic liquid hydrogen storage material according to claim 2, wherein the high-temperature treatment is performed at a temperature of 200-250 ℃ for a treatment time of 1-3 hours.
4. 4. The method for preparing a dehydrogenation catalyst of an organic liquid hydrogen storage material according to claim 1, characterized in that the noble metal comprises one or more of platinum and palladium.
5. 5. A dehydrogenation catalyst characterized by being prepared by the preparation method of the dehydrogenation catalyst of the organic liquid hydrogen storage material according to any one of claims 1 to 4.
6. 6. A method of dehydrogenating an organic liquid hydrogen storage material, comprising the step of heating the organic liquid hydrogen storage material, the dehydrogenation catalyst, and a solvent in combination.
7. 7. The method according to claim 6, wherein the dehydrogenation catalyst is added in an amount of 15-25wt% of the organic liquid hydrogen storage material.

Description

Dehydrogenation catalyst and preparation method and application thereof Technical Field The application relates to the field of dehydrogenation catalysts, in particular to a dehydrogenation catalyst, a preparation method and application thereof. Background The hydrogen is used as a green fuel and an energy carrier with great potential, the application of the hydrogen is limited by the efficiency and the safety of storage and transportation, the common hydrogen storage technology comprises high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage and organic liquid hydrogen storage, wherein the organic liquid hydrogen storage utilizes an organic substance as a hydrogen storage carrier to realize the storage and release of the hydrogen through hydrogenation and dehydrogenation reactions, and the hydrogen storage technology has the advantages of high hydrogen storage density, good safety and the like. At present, when the organic liquid hydrogen storage material is used, the dehydrogenation reaction is often carried out by being matched with a catalyst. Carbon nanotubes, which are a carbon-based material having a unique structure, are widely used as catalyst carriers due to their excellent stability, high selectivity, and good metal carrier interactions. However, the catalyst has the problem of drastically reduced cycle stability after multiple cycles, which limits its application in practical production. Disclosure of Invention In view of the above-mentioned disadvantages of the related art, an object of the present application is to provide a dehydrogenation catalyst, a preparation method and application thereof, which improves the cycle stability of dehydrogenation reaction by performing plasma treatment on a carrier and then loading noble metals to prepare the dehydrogenation catalyst, and applying the dehydrogenation catalyst to an organic liquid hydrogen storage material. In a first aspect, the preparation method of the dehydrogenation catalyst provided by the application adopts the following technical scheme: the preparation method of the dehydrogenation catalyst comprises the following steps of taking a carrier, carrying out plasma pretreatment on the carrier through reaction gas to obtain a pretreated carrier, and loading noble metal on the pretreated carrier to obtain the dehydrogenation catalyst; The reactive gas includes one or more of an oxidizing gas, a reducing gas, and a neutral gas. Preferably, the reaction gas includes one or more of oxygen, hydrogen, and an inert gas. Preferably, the reaction gas comprises one or more of oxygen, hydrogen and argon Preferably, the plasma pretreatment comprises the step of ionizing a reaction gas into plasma to react with the carrier, wherein the flow rate of the reaction gas is 5-15mL/min. Preferably, the flow rate of the reaction gas is 10mL/min. Preferably, the ionization voltage is 80-120V. Preferably, the voltage of the ionization is 100V. Preferably, the noble metal loading comprises the step of mixing the pre-treated support with a precursor followed by high temperature treatment. Preferably, the temperature parameter of the high-temperature treatment is 200-250 ℃ and the treatment time is 1-3h. Preferably, the high temperature treatment is performed under a reducing atmosphere, which is realized by a mixed gas including hydrogen and argon. Preferably, the flow rate of the mixed gas is 60-80mL/min. Preferably, the flow rate of the mixed gas is 70mL/min. Preferably, the carrier comprises one or more of carbon nanotubes and activated carbon nanotubes. Preferably, the carrier is an activated carbon nanotube. Preferably, the activated carbon nanotube is prepared by mixing, stirring and drying the carbon nanotube, alkali and water, then placing the mixture in an inert gas atmosphere for treatment at the temperature of 750-850 ℃, neutralizing the mixture with acid, washing the neutralized mixture with water, and then drying and grinding the neutralized mixture. Preferably, the noble metal comprises one or more of platinum and palladium. Preferably, the noble metal is palladium. Preferably, the precursor comprises ammonia and sodium chloropalladate. Preferably, the mixing comprises mixing and stirring aqueous ammonia, sodium chloropalladate and the pretreatment carrier. In a second aspect, the present application provides a dehydrogenation catalyst employing the following technical scheme: a dehydrogenation catalyst is prepared by the preparation method of the dehydrogenation catalyst. In a third aspect, the present application provides the use of a dehydrogenation catalyst in the dehydrogenation of an organic liquid hydrogen storage material. Preferably, the method comprises the step of mixing and heating the organic liquid hydrogen storage material, the dehydrogenation catalyst and the solvent. Preferably, the solvent is mesitylene. Preferably, the dehydrogenation catalyst is added in an amount of 15-25wt% of the organic liquid hydrogen