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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is still difficult to control its dispersion on the surface of the support by adding basic oxides or carbon coating, which limits the acidity adjustment of the support.

Method used

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  • Cycloalkane dehydrogenation catalyst, preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 1.88g of aluminum nitrate, then press Al 3+ / Mg 2+ / C 3+ The molar ratio is 5:15:1. Measure and weigh a certain amount of magnesium nitrate and cerium nitrate and dissolve them in 40 mL of deionized water to prepare metal salt mixed solution A; weigh 2.40 g of NaOH and 0.4 g of anhydrous Na 2 CO 3 Dissolve in 50 mL of deionized water to make 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 speed 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 the alkali mixed solution B dropwise, continue the reaction for 30 minutes, transfer the suspension to a hydrothermal reaction kettle, crystallize at 95ºC for 10 hours, then suction filter the suspension, and wash the filtered solid , drying to obtain Ce-Mg-Al hydrotalcit...

Embodiment 2

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

Embodiment 3

[0032] According to the preparation process and activity test conditions of the catalyst in Example 1, only the dehydrogenation reaction temperature was adjusted to 325°C to catalyze the dehydrogenation of cyclohexane, and the dehydrogenation conversion rate of the catalyst was 99.3% during the continuous reaction for 8 hours, and hydrogen production rate of 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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