Catalyst for selective hydrogenation reaction of aromatic nitrocompound and preparation method of catalyst

A technology for aromatic nitro groups and catalysts, which is applied in the field of catalysts and preparations for selective hydrogenation of aromatic nitro compounds, and can solve problems such as difficulty in realizing catalyst reuse, increasing catalyst preparation costs, and limiting the practical application of catalysts. No degradation in performance, easy separation, and easy operation

Inactive Publication Date: 2015-11-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, there have been quite a few reports on the selective hydrogenation of substituted aromatic amines. The heterogeneous catalysts reported in the literature are mainly divided into two categories: 1) noble metal catalysts, such as supported gold (WO2007116111-A1; Journal of Catalysis, 265 (2009) , 19; GreenChem., 14(2012), 3164) and platinum catalysts (WO2009071727; CN201210468132.8; JournalofCatalysis, 321(2015), 7), etc. These noble metal catalysts are costly, need to add additives to regulate selectivity, and the product There are problems such as metal residues in the catalyst, which greatly limits the practical application of thi

Method used

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  • Catalyst for selective hydrogenation reaction of aromatic nitrocompound and preparation method of catalyst
  • Catalyst for selective hydrogenation reaction of aromatic nitrocompound and preparation method of catalyst
  • Catalyst for selective hydrogenation reaction of aromatic nitrocompound and preparation method of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1. Catalyst based on Co and nanographitic carbon

[0036] Take 20ml of distilled water, add 1.875g of tartaric acid under stirring, then add 1.819g of Co(NO3 ) 2 ·6H 2 O, then add 60ml glycerin aqueous solution (glycerin: water = 4:1, volume ratio) and 5.0g polyethylene glycol PEG6000, finally add 0.5g nano-graphite carbon, after stirring evenly, place in a hydrothermal kettle at 150°C for 13h, After the obtained solid was dried, it was transferred to a tube furnace and calcined at 800° C. for 2.0 h under argon to obtain a carbon layer-coated Co catalyst dispersed on nano-graphitic carbon, with a Co content of 29.2 wt%.

[0037] figure 1 The X-ray diffraction pattern of the carbon-coated cobalt-based catalyst shows that the active metal cobalt is in a reduced state.

Embodiment 2

[0038] Example 2. Catalysts based on Ni and nanographitic carbon

[0039] Take 20ml of distilled water, add 1.875g of tartaric acid under stirring, then add 1.818g of Ni(NO 3 ) 2 ·6H 2 O, then add 60ml glycerin aqueous solution (glycerin: water = 4:1, volume ratio) and 5.0g polyethylene glycol PEG6000, finally add 0.5g nano-graphite carbon, after stirring evenly, place in a hydrothermal kettle at 150°C for 13h, After the obtained solid was dried, it was transferred to a tube furnace and calcined at 800° C. for 2.0 h under argon to obtain a carbon layer-coated Ni catalyst dispersed on nano-graphitic carbon, and the Ni content was 28.0 wt%.

[0040] figure 2 The transmission electron microscope image of the cobalt-based catalyst coated with the carbon layer shows that the active metal cobalt nanoparticles are coated with a carbon layer of about 2-5nm.

Embodiment 3

[0041] Example 3. Catalysts based on Cu and nanographitic carbon

[0042] Take 20ml of distilled water, add 1.875g of tartaric acid under stirring, then add 1.51g of Cu(NO 3 ) 2 ·3H 2 O, then add 60ml glycerin aqueous solution (glycerin: water = 4:1, volume ratio) and 5.0g polyethylene glycol PEG6000, finally add 0.5g nano-graphite carbon, after stirring evenly, place in a hydrothermal kettle at 150°C for 13h, After the obtained solid was dried, it was transferred to a tube furnace and calcined at 800° C. for 2.0 h under argon to obtain a carbon layer-coated Cu catalyst dispersed on nano-graphitic carbon, with a Cu content of 30.1 wt%.

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Abstract

The invention relates to a catalyst for selective hydrogenation reaction of an aromatic nitrocompound and a preparation method of the catalyst. The catalyst consists of a catalyst carrier and active metal coated with carbon, wherein the catalyst carrier includes a carbon-base carrier, SiO2, TiO2 or Al2O3; the active metal is selected from Co, Fe, Ni or Cu and other poor and noble metals. The catalyst is prepared by adopting a Pechini type sol-gel process which comprises the steps of dispersing an active metal precursor to water containing a coordination compound, adding a polyhydric alcohol solution and a macromolecule auxiliary, then adding the carrier, stirring for dispersion, carrying out hydrothermal reaction, separating out solid on the lower layer, and calcining in the inert atmosphere to obtain the catalyst in which carbon coats the active metal. Compared with the prior art, the catalyst can realize the hydrogenation reaction of a substituted aromatic nitrocompound in the mild condition; substrate conversion rate and production selectivity are high; the catalyst has recyclable economy and good application prospect.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a catalyst for selective hydrogenation of aromatic nitro compounds and a preparation method thereof. Background technique [0002] Functionalized aromatic amines are a class of important chemical raw materials transformed from substituted aromatic nitro compounds, which are widely used in the synthesis of pharmaceuticals, dyes, polymers, pesticides, spices and surfactants, biomass fuels, etc. Chemical Products. The hydrogenation of nitro compounds to prepare aromatic amines is a common catalytic hydrogenation reaction, which can be realized by many commercial catalysts, such as Pd / C, Pt / C or RaneyNi, etc., and these catalysts are relatively selective in the hydrogenation reaction of substituted nitro compounds. Low. Therefore, the key to successfully realize the selective hydrogenation of substituted aromatic nitro compounds to prepare functional aromatic amines lies in the ...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J23/755B01J23/72C07B43/04C07C209/36C07C211/46C07C211/52C07C211/51C07C213/02C07C215/76C07C217/84C07C225/22C07C221/00C07C237/30C07C231/12C07C229/60C07C227/04C07C255/58C07C253/30C07D215/40
CPCY02P20/584
Inventor 陈兵峰袁国卿李峰波黄志军
Owner INST OF CHEM CHINESE ACAD OF SCI
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