A catalyst for selective hydrogenation of aromatic nitro compounds and preparation method thereof
A compound and catalyst technology, which is applied in the field of catalysts and preparations for selective hydrogenation of aromatic nitro compounds, can solve the problems of difficult to realize catalyst reuse, limit the practical application of catalysts, increase the cost of catalyst preparation, etc., and achieve excellent catalytic performance. Reduced weight, easy separation, and easy operation
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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 PEG 6000, finally add 0.5g nano-graphite carbon, after stirring evenly, place in a hydrothermal kettle at 150°C for 13h After drying the obtained solid, it was transferred to a tube furnace for calcination at 800° C. for 2.0 h under argon to obtain a carbon-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 PEG 6000, 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 PEG 6000, 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 for calcination 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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