SiO2 supported nanometer silver catalyst, preparing method and applications thereof

A silicon dioxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, preparation of amino compounds, etc., can solve the problems of inconvenient transportation, difficult storage, environmental pollution, etc. Reduced catalyst cost, mild reaction conditions, improved production process effects

Inactive Publication Date: 2008-07-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The metal powder-acid chemical reduction method produces a large amount of inorganic salt waste, which pollutes the environment and does not meet the requirements of green chemistry
Electrochemical reduction method has high requirements on electrodes, electrolyte and electrolytic cell, and is not suitable for mass production
[0005] 2. The catalysts used in the catalytic hydrogenation method are Raney nickel and platinum. During

Method used

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  • SiO2 supported nanometer silver catalyst, preparing method and applications thereof
  • SiO2 supported nanometer silver catalyst, preparing method and applications thereof

Examples

Experimental program
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Effect test

specific Embodiment 1

[0022] In the stainless steel reactor of 100ml, add 0.5g p-chloronitrobenzene, 30ml ethanol and 0.05g catalyst (Ag loading capacity 4.0%), seal autoclave, fill H 2 Inflate to a pressure of 2.0MPa, then vent. Repeat the operation three times to remove the air in the kettle. Finally H 2 Charge to 2.0MPa, heat to 140°C, and react for 3.0 hours. During the reaction process, mechanical stirring was carried out at a speed of 900 revolutions per minute (900 r.p.m.). After the reaction was over, the reactor was naturally cooled to room temperature, and N 2 The gas is purged twice to remove the H in the kettle 2 . The catalyst was recovered from the reaction solution by centrifugation at a speed of 12000 r.p.m. The catalyst was washed three times with ethanol (3*5ml), and dried in vacuum at 60°C for recycling. The organic clear liquid was diluted with methanol and then analyzed and identified by GCMS-QP2010 (SHIMADZU) mass spectrometer. The results showed that the conversion rate...

specific Embodiment 2

[0023] In a 100ml stainless steel reaction kettle, add 0.5g p-chloronitrobenzene, 30ml ethanol and 0.10g catalyst (Ag loading capacity 1.0%), seal the autoclave, fill with H 2 Inflate to a pressure of 2.0MPa, then vent. Repeat the operation three times to remove the air in the kettle. Finally H 2 Charge to 3.0MPa, heat to 140°C, and react for 3.0 hours. During the reaction process, mechanical stirring was carried out at a speed of 900 revolutions per minute (900 r.p.m.). After the reaction was over, the reactor was naturally cooled to room temperature, and N 2 The gas is purged twice to remove the H in the kettle 2 . The catalyst was recovered from the reaction solution by centrifugation at a speed of 12000 r.p.m. The catalyst was washed three times with ethanol (3*5ml), and dried in vacuum at 60°C for recycling. The organic clear liquid was diluted with methanol and then analyzed and identified by GCMS-QP2010 (SHIMADZU) mass spectrometer. The results showed that the con...

specific Embodiment 3

[0024] In a 100ml stainless steel reaction kettle, add 0.5g p-chloronitrobenzene, 30ml ethanol and 0.05g catalyst (8.0% Ag loading), seal the autoclave, and fill with H 2 Inflate to a pressure of 2.0MPa, then vent. Repeat the operation three times to remove the air in the kettle. Finally H 2 Charge to 2.0MPa, heat to 140°C, and react for 3.0 hours. During the reaction process, mechanical stirring was carried out at a speed of 900 revolutions per minute (900 r.p.m.). After the reaction was over, the reactor was naturally cooled to room temperature, and N 2 The gas is purged twice to remove the H in the kettle 2 . The catalyst was recovered from the reaction solution by centrifugation at a speed of 12000 r.p.m. The catalyst was washed three times with ethanol (3*5ml), and dried in vacuum at 60°C for recycling. The organic clear liquid was diluted with methanol and then analyzed and identified by GCMS-QP2010 (SHIMADZU) mass spectrometer. The results showed that the conversi...

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PUM

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Abstract

The invention discloses a catalyst for loading silver on SiO2, a preparation method and application in a selective catalytic hydrogenation of chloro-aromatic compounds, nitryl-aromatic ene, nitryl-aromatic aldehydes, nitryl-aromatic ketone, and nitryl-aromatic polyamide. The synthetic method is that tetraethoxysilane and aminopropyl-triethoxysilane are added by weight proportion of 1: 0.1-1: 25 into an ammonia solution containing definite AgNO3, then the solution is stirred to form gelatinate under room temperature and dried under 100-200 DEG C for about 4-12 hours, thus obtaining the catalyst. The synthetic catalyst of the invention solves two problems of current catalytic hydrogenation of aromatic nitro-compounds: (1) a secondary reaction of dechlorination is generated during the hydrogenation of chloronitrobenzenes of aromatic nitro-compounds; (2) the selectivity of reaction is poor when alkene, aldehydes, ketone, nitrile and amide groups coexist.

Description

technical field [0001] The invention relates to a silicon dioxide-supported nano-silver catalyst, a preparation method of the catalyst and its application in the selective hydrogenation of nitroaromatic compounds to prepare aminoaromatic compounds. Background technique [0002] Efficient and selective catalytic hydrogenation of aromatic nitro compounds is of great significance in the industrial field. Aminoaromatic compounds are very important chemical intermediates, which can be used to synthesize various fine chemicals such as pesticides, drugs, and photoelectric functional molecules. At present, the preparation methods of aminoaromatic compounds include: metal powder-acid chemical reduction method, electrochemical reduction method, and catalytic hydrogenation method. [0003] The main problems with these methods are: [0004] 1. The metal powder-acid chemical reduction method produces a large amount of inorganic salt waste, which pollutes the environment and does not me...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J21/08C07C209/36
Inventor 徐正李保军
Owner NANJING UNIV
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