Selectivity liquid phase hydrogenation catalyst and preparation method and use thereof

A liquid-phase hydrogenation and selective technology, applied in the direction of catalyst activation/preparation, carbon-based compound preparation, chemical instruments and methods, etc., can solve the difficulty of separating catalysts and reaction products, affect catalytic activity and selectivity, and cause large catalyst loss etc. to achieve the effects of easy separation, high activity and selectivity, and reduced catalyst loss

Inactive Publication Date: 2008-05-28
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of these methods are: it is difficult to separate the catalyst from the reaction product, and the loss of the catalyst is large.
If a fixed bed

Method used

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  • Selectivity liquid phase hydrogenation catalyst and preparation method and use thereof
  • Selectivity liquid phase hydrogenation catalyst and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: get washed, dried 10.0g cordierite ((MgO) 2 -(Al 2 o 3 ) 2 -(SiO 2 ) 5 ) type honeycomb ceramics, immersed in 0.1M nickel nitrate solution for 0.5h, taken out and dried at 120°C for 4h, roasted in air at 600°C for 4h, cooled to 570°C, and passed through 50% methane-nitrogen mixture for 3h to obtain structured composite nano carbon fiber material. Using this as a carrier, impregnate it with 0.1M palladium nitrate solution for 0.5h, take it out, dry it at 120°C for 4h, and roast it in nitrogen at 500°C for 4h to prepare a structured composite nano-carbon fiber supported palladium catalyst containing 0.5wt% palladium.

Embodiment 2

[0014] Example 2: Add 200ml of 0.1M citral-cyclohexane solution into a 500ml autoclave, add 0.3g of the catalyst prepared in Example 1, and stir for 30min at 60°C under a hydrogen pressure of 10-40 bar. The liquid phase mixture is used According to gas chromatography analysis, the conversion rate of citral is >90%, and the selectivity of citronellal is 90%.

Embodiment 3

[0015] Embodiment 3 (comparative embodiment): with commercially available 0.5%Pd / C catalyst (specific surface 850m 2 / g) instead of the catalyst prepared in Example 1, catalytic hydrogenation was carried out under the same reaction conditions as in Example 3, the conversion rate of citral was 90%, and the selectivity of citronellal was less than 60%.

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Abstract

The invention relates to a catalyst, which is applicable to the selective liquid phase catalytic hydrogenation of Alpha, Beta-unsaturated carbonyl compounds to make corresponding unsaturated carbonyl compounds or unsaturated alcohol, being especially suitable for the selective hydrogenation of citral to make citronellal and/or citronellol. The catalyst of the invention is a metal component loaded on a structured composite nano carbon fiber, wherein, the metal component is selected from one of or a plurality of nickel, ruthenium, rhodium, palladium and platinum. The components of the catalyst are: 1) structured substrate, such as metal foam, honeycomb ceramic, carbon felt and ceramic fiber; 2) nano material coating, such as nano carbon fiber; 3) metal active component, such as nickel, ruthenium, rhodium, palladium and/or platinum. The invention effectively avoids deep reaction, thus enhancing the target product selectivity. The catalyst is prefabricated into a variety of shapes and installed in a reactor, so that the catalyst, the liquid phase reactants and the solution are easy to be separated, thus meanwhile reducing the loss of the catalyst.

Description

technical field [0001] The present invention relates to a catalyst. The catalyst is suitable for selective liquid-phase catalytic hydrogenation of α, β-unsaturated carbonyl compounds to produce corresponding saturated carbonyl compounds or unsaturated alcohols. It is especially suitable for the selective hydrogenation of citral to produce citronellal and / or citronellol. Background technique [0002] The rate of heterogeneous catalytic reactions, especially gas-solid-liquid three-phase catalytic reactions, is usually limited by mass transfer. The result is a decrease in the overall package reaction rate. Mass transfer limitations can also affect target product selectivity in complex reactions. Especially for those complex reactions whose target products are the intermediate products of a series of continuous reactions, such as the selective hydrogenation of citral to produce citronellal and / or citronellol, mass transfer limitations lead to a significant decrease in target ...

Claims

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Application Information

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IPC IPC(8): B01J37/025B01J23/89B01J21/18B01J21/16C07C29/136C07C45/62
Inventor 李明时朱建军单玉华莱昂.莱佛茨
Owner JIANGSU POLYTECHNIC UNIVERSITY
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