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Wire mesh loaded nano composite catalyst, preparation method thereof, and application of wire mesh loaded nano composite catalyst in alcoholic preparation of aldehyde ketone

A wire mesh and nano-composite technology, applied in the field of catalysis, can solve the problems of many by-products, poor low-temperature activity, and increased resistance of the reaction bed, and achieve the effects of low production cost, high low-temperature activity, and good stability

Active Publication Date: 2017-05-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking silver-based catalysts as an example, due to their relatively low price and good stability, silver-based catalysts have been industrially used in the gas-phase selective oxidation of methanol, ethanol and ethylene glycol, but their low-temperature activity is poor. Macromolecular alcohols (such as benzyl alcohol) are prone to carbon deposition and deep oxidation, and silver microcrystals are prone to rapid agglomeration under high temperature conditions, resulting in a decrease in catalytic activity and selectivity and an increase in reaction bed resistance
Oxide-supported silver catalysts catalyze the oxidation of alcohols to prepare aldehydes and ketones. The supported silver catalyst reported in the US patent [US 1067665] is simple to prepare and has high silver loading. However, the specific surface area of ​​the catalyst is small and the activity is not ideal.
Chinese patent adopts sol-gel method to prepare a kind of supported silver catalyst [CN 1262348C] for methanol dehydrogenation to produce anhydrous formaldehyde, but preparation process is loaded down with trivial details, and by-product is more
The main reason for the above problems is that the silver particles are too large (the particle size is tens to hundreds of nanometers), which makes the catalytic performance of the catalyst poor; on the other hand, a single silver particle is used as the active component without adding additives. To regulate the catalytic performance

Method used

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  • Wire mesh loaded nano composite catalyst, preparation method thereof, and application of wire mesh loaded nano composite catalyst in alcoholic preparation of aldehyde ketone
  • Wire mesh loaded nano composite catalyst, preparation method thereof, and application of wire mesh loaded nano composite catalyst in alcoholic preparation of aldehyde ketone
  • Wire mesh loaded nano composite catalyst, preparation method thereof, and application of wire mesh loaded nano composite catalyst in alcoholic preparation of aldehyde ketone

Examples

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preparation example Construction

[0025] The present invention provides a method for preparing a metal wire mesh-supported nanocomposite catalyst, which comprises the following steps:

[0026] 1) Soak the wire mesh at room temperature for 0.1-20 hours with 0.02-5 mol / L acid (hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid or acetic acid) aqueous solution, and then soak it in octadecylamine at 60-200°C for 0.1-20 hours , then washed with ethanol, dried for later use;

[0027] 2) The "metal-metal oxide" nanocomposite is synthesized by the octadecylamine synthesis method, 1-50 ml of octadecylamine is weighed, heated to 100-300 ° C, and then the metal salt raw materials are added for stirring, and finally the "metal-metal oxide" is obtained. - Metal oxides" nanocomposites;

[0028] 3) Disperse the "metal-metal oxide" nanocomposite in cyclohexane, and then load it on the wire mesh processed in step 1) by an equal volume dipping method, and dry it at 50-150 ° C, Finally, the catalyst is obtained.

...

Embodiment 1

[0032] This example provides wire mesh supported "Ag nanoparticles and Cu with equal particle size" 2 Preparation of O-nanoparticle composites" catalysts.

[0033] Ag nanoparticles and Cu with equal particle size 2 The preparation method of the O nanoparticle composite is: weigh 10 ml of octadecylamine, heat it to 200 ° C, and then add a certain amount of AgNO 3 and Cu(NO 3 ) 2 , stirred at this temperature for 10 minutes, and finally obtained Ag nanoparticles and Cu nanoparticles with the same particle size. 2 O nanoparticle complexes.

[0034] The prepared nanocomposites are supported on a wire mesh by an equal volume impregnation method, and the wire mesh can be: stainless steel (SS-Gauze), aluminum (Al-Gauze), brass (HT-Gauze) or cupronickel ( BT-Gauze) wire mesh, wire diameter 0.1 to 2 mm.

[0035] Wire mesh supports "Ag nanoparticles and Cu with equal particle size" 2 O nanoparticle composite" catalysts are denoted as Ag-Cu, respectively 2 O / SS-Gauze, Ag-Cu 2 O / ...

Embodiment 2

[0037] This example provides the preparation of a "large CoO nanoparticle and small Ag nanoparticle composite" catalyst supported on a wire mesh.

[0038] The preparation method of the large CoO nanoparticle and small Ag nanoparticle composite is: weigh 10 ml of octadecylamine, heat it to 120 ° C, and then add a certain amount of Co(NO 3 ) 2 , heat up to 250°C, stir at this temperature for 10 minutes, then cool down to 120°C, add a certain amount of AgNO 3 , heated to 190 °C, and stirred at this temperature for 10 minutes to finally obtain a composite of large CoO nanoparticles and small Ag nanoparticles.

[0039] The prepared nanocomposites are supported on a wire mesh by an equal volume impregnation method, and the wire mesh can be: stainless steel (SS-Gauze), aluminum (Al-Gauze), brass (HT-Gauze) or cupronickel ( BT-Gauze) wire mesh, wire diameter 0.1 to 2 mm.

[0040] Wire mesh supported "large CoO nanoparticles and small Ag nanoparticles composite" catalysts are denote...

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Abstract

The invention discloses a wire mesh loaded 'metal-metal oxide' nano composite catalyst, and an application thereof in catalytic alcoholic preparation of aldehyde ketone. The catalyst is prepared by using a wire mesh subjected to surface pretreatment to load a 'metal-metal oxide' nano composite. The wire mesh loaded 'metal-metal oxide' nano composite catalyst is simple and convenient in preparation, easy to amplify, low in preparation cost, good in heat conductivity, high in low-temperature activity, high in selectivity and good in stability; and moreover, the wire mesh loaded 'metal-metal oxide' nano composite catalyst is applied to a reaction for preparing aldehyde ketone by catalyzing selective oxidation of alcohol, so that the efficiency is high, the reaction is environment-friendly, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of catalysis, in particular to a metal wire mesh-supported "metal-metal oxide" nano-composite catalyst and its application in the gas-phase selective catalytic oxidation of alcohols to produce aldehydes and ketones. [0002] technical background [0003] The selective oxidation of alcohols to aldehydes and ketones is an important functional group transformation reaction in the organic synthesis industry. The traditional synthesis of aldehydes and ketones is generally achieved by oxidizing alcohols in organic solvents using stoichiometric oxidants (such as toxic and harmful Cr salts, dangerous and expensive organic peroxides, etc.). There are also aldehydes or ketones (eg, benzaldehyde) that can be prepared by hydrolysis of organic halides. These processes not only have low efficiency, high energy consumption, and serious pollution, but also have problems such as high residues of toxic components in products....

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/68C07C45/38C07C47/54C07C47/12C07C49/403C07C47/02C07C49/04C07C49/78C07C47/228
CPCB01J23/688B01J23/8913B01J23/892B01J23/8926C07C45/38C07C47/54C07C47/12C07C49/403C07C47/02C07C49/04C07C49/78C07C47/228
Inventor 李亚栋赵国锋牛志强纪永军王定胜彭卿
Owner TSINGHUA UNIV
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