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Pt-Sn supported hydrotalcite dehydrogenation catalyst and preparation method and application thereof

A dehydrogenation catalyst, hydrotalcite technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve a simple preparation process, enhanced dehydrogenation activity, and excellent performance. Effect

Active Publication Date: 2017-11-24
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the fact that the aromatics hydrogenation process is relatively perfect in the current organic liquid hydrogen storage technology, but there are many problems to be solved in the dehydrogenation process, the present invention provides a platinum-tin-supported hydrotalcite dehydrogenation catalyst (Pt-Sn / Mg-Al -O) and its preparation method and application, the prepared catalyst is used in cycloalkane dehydrogenation reaction, and can have high selectivity and conversion rate at lower temperature

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  • Pt-Sn supported hydrotalcite dehydrogenation catalyst and preparation method and application thereof
  • Pt-Sn supported hydrotalcite dehydrogenation catalyst and preparation method and application thereof

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Effect test

Embodiment 1

[0025] Weigh 3.84g of magnesium nitrate and 1.88g of aluminum nitrate, dissolve them together in 40mL of deionized water, and configure them as Mg 2+ / Al 3+ Metal salt solution A with a molar ratio of 3; weigh 2.4g sodium hydroxide and 0.4g anhydrous sodium carbonate, dissolve them in 50mL of deionized water together, configure alkali solution B, and pour A and B solutions into Two constant pressure titration funnels are connected with a three-necked flask and a constant speed stirrer. Under the conditions of room temperature and high-speed stirring, slowly drop the A and B solutions in the constant pressure titration funnel into the three-necked flask at a speed of 3mL / min, make them fully mixed, and control the pH of the suspension at 9.5~ 10.5, and then continue to stir at high speed for 30 minutes. Then transfer the suspension to a 200mL hydrothermal reaction kettle, crystallize at 95°C for 10h, take it out for suction filtration, wash with water and alcohol three times ...

Embodiment 2

[0028] According to the preparation method and reaction conditions of catalyst in embodiment 1, Mg 2+ / Al 3+ The molar ratio is adjusted to 1:1, the loading amount of platinum is adjusted to 5%, the loading amount of tin is adjusted to 2wt%, the calcination temperature is adjusted to 600 ° C, and other conditions are unchanged, the dehydrogenation reaction of methylcyclohexane is carried out, The dehydrogenation conversion rate of methylcyclohexane after continuous reaction for 10 h was 91.0%, the selectivity of toluene was 99.9%, and the hydrogen release rate of the catalyst was 263.5 mmol H 2 g -1 cat. h -1 .

Embodiment 3

[0030] According to the preparation method and reaction conditions of catalyst in embodiment 1, Mg 2+ / Al 3+ The molar ratio of the molar ratio is adjusted to 4:1, the loading of platinum is adjusted to 0.5%, the loading of tin is changed to 0.1wt%, and other conditions are unchanged, the dehydrogenation reaction of methylcyclohexane is carried out, and the formazan after continuous reaction 10h The dehydrogenation conversion rate of cyclohexane was 65.0%, the selectivity of toluene was 99.9%, and the hydrogen release rate of the catalyst was 188.2 mmol H 2 g -1 cat. h -1 .

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Abstract

The invention discloses a Pt-Sn supported hydrotalcite dehydrogenation catalyst and a preparation method and application thereof. Firstly, a Mg-Al hydrotalcite carrier is prepared by an alkali precipitation method, then an incipient-wetness impregnation method is adopted to load active components of Pt and Sn, the loading capacity of Pt is 0.5-5%, the loading capacity of Sn is 0.1-2%, finally, reduction is performed by a hydrogen temperature programming part to obtain the Pt-Sn supported hydrotalcite dehydrogenation catalyst, and the reduction temperature is 250-380 DEG C. The Pt-Sn supported hydrotalcite dehydrogenation catalyst is simple in preparation process, is not involved with repeated calcining or activating, and in a cycloparaffin dehydrogenation reaction, the obtained catalyst has the advantages of mild reaction condition, high catalytic activity, high hydrogen release rate and the like, and has a good industrial hydrogen storage application prospect.

Description

technical field [0001] The invention belongs to the field of chemical hydrogen storage, and in particular relates to a platinum-tin-loaded hydrotalcite dehydrogenation catalyst (Pt-Sn / Mg-Al-O) and a preparation method and application thereof. Background technique [0002] As a renewable, pollution-free, storable, transportable, and efficient green energy, hydrogen energy has undoubtedly become a research hotspot in the 21st century for its development and utilization. In the utilization of hydrogen energy, the large-scale storage and transportation of hydrogen is a major problem. Compared with traditional high-pressure compression hydrogen storage and metal hydride hydrogen storage, organic liquid hydrides are safe and stable, have a large hydrogen storage capacity, and are hydrogenation-degassing. The hydrogen reaction has the advantage of being highly reversible. Organic liquid hydrogen storage technology mainly uses the hydrogenation-dehydrogenation reversible reaction b...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J37/03B01J37/02B01J37/08B01J37/18C07C5/367C07C15/06C07C15/14C07C15/04
Inventor 杨运泉颜景王威燕苗磊李文松
Owner XIANGTAN UNIV
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