Cycloalkane dehydrogenation catalyst, preparation method thereof and application

A dehydrogenation catalyst and naphthenic technology, which are applied in the field of chemical hydrogen storage, can solve the problems of difficulty in controlling dispersion, the limitation of carrier acidity regulation, etc., and achieve the effects of promoting dispersion, simple preparation process, excellent catalytic reaction activity and hydrogen production rate.

Active Publication Date: 2017-05-10
XIANGTAN UNIV
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  • Abstract
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Problems solved by technology

[0004] However, it is still difficult to control its dispersion on the surface of the support

Method used

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  • Cycloalkane dehydrogenation catalyst, preparation method thereof and application

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Experimental program
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Example Embodiment

[0026] Example 1

[0027] Weigh 1.88g of aluminum nitrate, and then press Al 3+ / Mg 2+ / Ce 3+ The molar ratio is 5:15:1. Weigh a certain amount of magnesium nitrate and cerium nitrate and dissolve them in 40 mL of deionized water to prepare a metal salt mixed solution A; weigh 2.40 g NaOH and 0.4 g anhydrous Na 2 CO 3 Dissolve it in 50 mL of deionized water and prepare the alkali mixed solution B. Under room temperature and vigorous stirring, use a constant pressure titration funnel to drop the alkali mixed solution B into the three-necked flask containing the metal salt mixed solution A at a rate of 4 mL / min, and control the pH value of the suspension in the three-necked flask at 9.5 ~ Within the range of 10.5, stop adding alkali mixed solution B, continue the reaction for 30 minutes, transfer the suspension to a hydrothermal reactor, crystallize at 95ºC for 10 h, and then suction filter the suspension to wash the filtered solid , Drying to obtain Ce-Mg-Al hydrotalcite. Take 1g...

Example Embodiment

[0029] Example 2

[0030] According to the catalyst preparation process and activity test conditions in Example 1, only the dehydrogenation reaction temperature was adjusted to 325°C to catalyze the dehydrogenation of methylcyclohexane. The dehydrogenation conversion rate of the catalyst was 99.1% after 8 hours of continuous reaction. The hydrogen production rate is 139 mmolH 2 g -1 cat. h -1 .

Example Embodiment

[0031] Example 3

[0032] According to the catalyst preparation process and activity test conditions in Example 1, only the dehydrogenation reaction temperature was adjusted to 325℃ to catalyze the dehydrogenation of cyclohexane. The dehydrogenation conversion rate of the catalyst was 99.3% when the reaction was continued for 8 h, and hydrogen production The rate is 139 mmol H 2 g -1 cat. h -1 .

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Abstract

The invention discloses a cycloalkane dehydrogenation catalyst, a preparation method thereof and an application. The preparation method includes steps of preparing a catalyst carrier Ce-Mg-Al or Zr-Mg-Al hydrotalcite by an alkali coprecipitation method; after drying the carrier, directly applying the carrier to immerse the load active component Pt or Pd or Ru; then drying, roasting and performing hydrogen reduction; acquiring the composite oxide dehydrogenation catalyst. The catalyst is applied to the cycloalkane dehydrogenation reaction, and can present excellent catalytic reaction activity and hydrogen producing rate under relatively gentle reaction condition; moreover, the preparation method is simple and has good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of chemical hydrogen storage, and in particular relates to a cycloalkane catalytic dehydrogenation catalyst and a preparation method and application thereof. Background technique [0002] With the increasing depletion of fossil energy, hydrogen energy, as a clean, efficient, safe, storable, and transportable environmentally friendly energy, is regarded as the energy with the most development potential in the 21st century, and its development and utilization have become a global research hotspot . The technical principle of liquid organic hydride hydrogen storage is to use the hydrogenation-dehydrogenation reversible reaction pair between unsaturated liquid aromatics and corresponding naphthenes to realize the storage and release of hydrogen. The hydrogen storage capacity of liquid organic hydride is much higher than that of high-pressure compression hydrogen storage and metal hydride hydrogen storage methods. Therefo...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/42C07C5/367C07C15/06C07C15/04C07C15/073
CPCY02P20/52B01J23/63B01J23/002B01J23/58B01J2523/00C07C5/367B01J2523/22B01J2523/31B01J2523/3712B01J2523/828B01J2523/824B01J2523/821B01J2523/48C07C15/06C07C15/04C07C15/073
Inventor 杨运泉王威燕余荣洪颜景仵奎刘文英
Owner XIANGTAN UNIV
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