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Application method of aFe(OH)xOy/Pt catalyst as hydrogenation reaction catalyst

An application method, hydrogenation reaction technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of low catalytic efficiency and high hydrogen pressure, and achieve High conversion rate of nitro group, low reaction temperature, good amination selectivity

Active Publication Date: 2020-05-15
厦门嘉氢科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the following shortcomings: (1) only to 3-nitrobenzene, 4-nitrobenzene, nitrobenzaldehyde, nitrobenzonitrile, chloronitrobenzene, bromonitrobenzene several Nitrobenzene compounds are effective; (2) The catalyst needs to be reduced in hydrogen at high temperature for several hours before use. High, up to 4MPa

Method used

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  • Application method of aFe(OH)xOy/Pt catalyst as hydrogenation reaction catalyst
  • Application method of aFe(OH)xOy/Pt catalyst as hydrogenation reaction catalyst
  • Application method of aFe(OH)xOy/Pt catalyst as hydrogenation reaction catalyst

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Experimental program
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Effect test

Embodiment approach

[0031] aFe(OH) x o y / Pt catalyst is used as the application method of hydrogenation reaction catalyst, in container, add organic solvent, the nitrobenzene compounds shown in general formula (1) and aFe(OH) x o y / Pt catalyst, mix evenly, raise the temperature to 50-75°C, pass in hydrogen to react, the reaction time is 30-200min, stop the flow of hydrogen, and lower the temperature;

[0032]

[0033] Among them, the catalyst is incompletely modified Fe(OH) on the surface of Pt x o y , that is, part of the exposed surface of the catalyst is Pt, and the other part is Fe(OH) x o y ;

[0034] a is the molar ratio of Fe and Pt, 0.01≤a≤0.5, x+2y=3, x / y=0.34-0.89, R is H or a substituent, and R is not an amino group.

[0035] Preferably, the aFe(OH) x o y The / Pt catalyst is loaded on the carrier to form a supported catalyst.

[0036] More preferably, the mass percentage of Pt in the supported catalyst is 0.5-5%. More preferably, the mass percentage of Pt in the support...

Embodiment 1

[0045] Add 1.5 mg of iron acetylacetonate to 10 mg of Pt nanoparticles protected by oleylamine, react at 240° C. for 1 h in 1 atmosphere of CO, cool down to room temperature, and wash to obtain Catalyst 1. figure 1 It is the XPS spectrum of catalyst 1. attached figure 1 The peak positions and peak areas are shown in Table 1.

[0046] Table 1

[0047]

[0048] Therefore, the expression for Catalyst 1 is 0.07Fe(OH) 0.44 o 1.28 / Pt.

Embodiment 2

[0050] Add 2.8 mg iron acetylacetonate to 10 mg Pt nanoparticles protected by oleylamine, react at 240 degrees, 1 atmospheric pressure of CO for 1 h, drop to room temperature, wash, and load on activated carbon according to the mass fraction of Pt as 2%, to obtain Supported Catalyst 2. The expression for catalyst 2 is 0.19Fe(OH) 0.7 o 1.15 / Pt.

[0051] attached figure 2 It is the low-energy ion scattering spectrum of catalyst 2. There are three elements of O, Fe and Pt on the surface of catalyst 2. After the particles of catalyst 2 are sputtered by 5keV ion beam for 5min, the peak intensity of Pt is obviously enhanced, which proves that the Fe on the surface of catalyst 2 particles is The ion beam is bombarded to expose the internal Pt. The above shows that the structure of catalyst 2 is that the surface of Pt is not completely modified with Fe(OH) x o y .

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Abstract

The invention discloses an application method of an aFe(OH)xOy / Pt catalyst as a hydrogenation reaction catalyst; the aFe(OH)xOy / Pt catalyst catalyzes hydrogenation of nitrobenzene compounds at a low temperature and under normal pressure to obtain an aminobenzene compound. According to the application method, unsaturated groups such as vinyl and carbonyl and groups such as halogen and haloalkyl ona reaction substrate of a nitrobenzene compound are not influenced, the conversion rate is high, the selectivity is good, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to the application of a catalyst in a hydrogenation reaction, specifically a Fe(OH) x o y / Pt catalyst as the application method of hydrogenation reaction catalyst. Background technique [0002] Aromatic amine-based compounds, as important organic intermediates, are widely used in the production of high value-added fine chemicals such as dyes, pigments, pharmaceuticals, and pesticides. Catalytic hydrogenation of nitrobenzene compounds is an important method for the preparation of aniline. There have been some public reports, such as CN1081620C, CN1207264C, CN1199935C, CN100436404C, CN1935777A. Simultaneously, CN106146232B also discloses the method for the selective hydrogenation of aromatic nitro compounds to prepare aromatic amine compounds, using Pt-Sb / TiO 2 As a catalyst, it has high selectivity for the hydrogenation of nitro groups, and is inert to the hydrogenation of easil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C209/36C07C221/00C07D235/26C07C211/45C07C211/52C07C223/06C07C225/22C07B43/04
CPCB01J23/8906C07C209/36C07C209/365C07C221/00C07D235/26C07B43/04B01J35/394C07C211/45C07C211/52C07C223/06C07C225/22
Inventor 郑南峰王瑜刘圣杰陈洁
Owner 厦门嘉氢科技有限公司
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