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Catalyst for preparing aromatic amine by catalytic hydrogenation of nitrobenzene compounds and its use method

A technology for catalytic hydrogenation of nitrobenzenes, applied in the fields of nano-silver, nano-gold catalysts, and catalysts, can solve the problems that the catalytic reduction performance of supported silver catalysts has not attracted people's attention, and achieves low cost, easy preparation, Good catalytic performance

Inactive Publication Date: 2006-05-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalytic reduction performance of supported silver catalysts has not attracted people's attention.

Method used

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  • Catalyst for preparing aromatic amine by catalytic hydrogenation of nitrobenzene compounds and its use method
  • Catalyst for preparing aromatic amine by catalytic hydrogenation of nitrobenzene compounds and its use method

Examples

Experimental program
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Embodiment 1

[0029] Preparation of SiO by Equal Volume Impregnation Method 2 supported nanosilver catalysts. Dissolve 0.1575 g of silver nitrate in 8 mL of distilled water according to the weight ratio of the active component to the carrier, and add 5.0 g of SiO 2Carrier, stirred and placed at room temperature for 12h, then dried at 80°C, and finally treated at 500°C for 2h in a helium atmosphere, to obtain a supported catalyst with a silver loading of 2wt%, wherein the active component mainly consists of The form of metallic silver exists.

Embodiment 2

[0031] Preparation of Ag / SiO by Microemulsion Method 2 catalyst. Weigh 6.0g (when the concentration of the salt solution is determined, that is, the number of moles of water has been determined, and its value changes according to the W value) surfactant (C 16 h 33 (OCH 2 CH 2 ) n OH, n=2-20), add 20mL cyclohexane and 5mL n-butanol to dissolve, then add 0.06g AgNO 3 3.6mL aqueous solution (w=4), stirring to form a microemulsion; adding two drops of hydrazine hydrate (85%), reducing AgNO 3 ; Add ammonia water to adjust pH = 9; then add 3.57g TEOS, 4mL cyclohexane and water mixture, stir to hydrolyze TEOS to form SiO 2 , aged, filtered, washed to form Ag / SiO 2 sample. In addition, after the formation of the microemulsion, ready-made SiO can be added 2 carrier, stirred for 2h, then added two drops of hydrazine hydrate to deposit silver on the SiO 2 On the carrier, the rest of the operations are the same as above.

Embodiment 3

[0033] Preparation of Ag / SiO by in situ reduction method 2 catalyst. First, 2g SiO 2 And 6ml of 3-aminopropylsilane dispersed in toluene. The temperature was raised to 80°C with stirring and maintained at 80°C for 8h. Cool, filter, wash with toluene and ethanol, and then dry in an oven at 80°C. Next, mix 5ml formaldehyde, 80ml deionized water and 20ml ethanol. Put 1.0g functionalized SiO 2 Add the above solution and stir at 40°C for 30min. Filter and wash with plenty of deionized water. Dry in a 50°C oven. Finally, 1.0 g of SiO containing reducing functional groups 2 Add 0.069g AgNO 3 In the prepared 90ml silver ammonia solution, stir at 40°C for 30min. Then, the resulting yellow solution was filtered and washed with copious amounts of deionized water. After the obtained solid is oven-dried at 50°C, highly dispersed nano-Ag / SiO with a loading of 4% can be obtained. 2 . Its transmission electron microscope pictures are shown in figure 1 .

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Abstract

The present invention relates to a catalyst for preparing arylamine by utilizing catalytic hydrogenation of nitrobenzene compound and its application method, belonging to the field of catalytic synthesis technology in application chemistry. Said catalyst is formed from carrier and active component, its carrier can be metal oxide; carbon materials of active carbon, carbon nano tube and porous carbon, etc.; micropore molecular sieve with different compositions or silica-base material into which one or several kinds of hetero-atoms are added, also can be organic high-molecular polymer. The active component can be double-component (multicomponent) metal formed from metal silver and gold or silver gold and palladium, platinum and copper, etc. in which the weight percentage of active metal component and carrie.r is 0.5-30%.

Description

technical field [0001] The invention belongs to the technical field of catalytic synthesis in applied chemistry. The invention relates to a catalyst for catalyzing the reduction of unsaturated nitro groups in aromatic compounds, specifically a catalyst based on supported nano-silver and nano-gold. Background technique [0002] The catalytic reduction of the unsaturated group-nitro group in aromatic compounds is an important way to realize the interconversion of organic raw materials. At present, the catalysts used in industry are mainly based on Pd, Pt, Ru, Ir and Raney Ni catalysts. However, these existing catalysts have disadvantages such as high price, poor selectivity and cumbersome preparation process. Supported silver catalysts have been extensively studied in catalytic oxidation reactions, such as Ag / Al 2 o 3 Has been applied to the industrial production of ethylene oxide. However, the catalytic reduction performance of supported silver catalysts has not attracte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/48B01J32/00C07C209/36C07C211/43
Inventor 邱介山陈杨英王闯
Owner DALIAN UNIV OF TECH
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