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Catalyst for greenly synthesizing halogenated arylamine by means of high-efficiency catalytic hydrogenation of halogenated aromatic nitro compound and preparation method thereof

An aromatic nitro group and catalytic hydrogenation technology, which is applied in the field of catalysts for the catalytic hydrogenation of halogenated aromatic nitro compounds to synthesize halogenated aromatic amines, can solve problems such as high activity, and achieve good performance, high raw material utilization, and stability. Good results

Inactive Publication Date: 2010-03-03
CHINA WEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this catalyst is that it has higher activity at higher temperature

Method used

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  • Catalyst for greenly synthesizing halogenated arylamine by means of high-efficiency catalytic hydrogenation of halogenated aromatic nitro compound and preparation method thereof
  • Catalyst for greenly synthesizing halogenated arylamine by means of high-efficiency catalytic hydrogenation of halogenated aromatic nitro compound and preparation method thereof
  • Catalyst for greenly synthesizing halogenated arylamine by means of high-efficiency catalytic hydrogenation of halogenated aromatic nitro compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of TiO by urea deposition-precipitation method 2 Supported Au and Pt bimetallic catalysts. According to the weight ratio of metal to carrier and two metal elements Au and Pt, 2.5×10 -5 mol / L HAuCl 4 And 1×10 -5 mol / L H 2 PtCl 6 Aqueous solution, add 2.0mL HAuCl 4 Aqueous solution (2.5×10 -5 mol / L) and 0.5mL H 2 PtCl 6 Aqueous solution (1×10 -5 mol / L) was added to 47.5mL of distilled water, 2 grams of carrier and 1.5 grams of urea were added to it, and the temperature was raised to 85°C under constant stirring and kept at this temperature for 2 to 5 hours. In this example, 4 hours were used, at room temperature Aging for 5-10 hours, 5 hours in this embodiment, washing with deionized water until no chlorine ions, drying at 50-110°C, drying at 110°C and roasting at 200-500°C for 2-5 hours in this embodiment, In this embodiment, calcination at 200°C for 5 hours is used to obtain a supported catalyst with an Au loading of 0.5 wt% and a Pt loading of 0.05 wt%.

Embodiment 2

[0020] Preparation of TiO by ammonia precipitation-precipitation method 2 Supported Au and Pt bimetallic catalyst. According to the weight ratio of metal to carrier and two metal elements Au and Pt, 2.5×10 -5 mol / L HAuCl 4 And 1×10 -5 mol / L H 2 PtCl 6 Aqueous solution, add 2.0mLHAuCl 4 Aqueous solution (2.5×10 -5 mol / L) and 0.5mL H 2 PtCl 6 Aqueous solution (1×10 -5 mol / L) was added to 47.5mL of distilled water, under constant stirring, 0.3% (w) ammonia was added dropwise to adjust the pH to 9.0, then 2 g of carrier was added, and ammonia was added dropwise to re-adjust the pH to 9.0, stirring for 5 hours , Aging at room temperature for 10 hours, washing with deionized water until there is no chloride ion, washing, drying at 110°C, and calcining at 200°C for 5 hours to obtain 0.5wt% Au loading and 0.05wt% Pt loading Supported catalyst.

Embodiment 3

[0022] Preparation of ZrO by urea deposition-precipitation method 2 Supported Au and Pt bimetallic catalysts. The preparation steps are the same as in Example 1.

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Abstract

The invention discloses a catalyst for greenly synthesizing halogenated arylamine by means of catalytic hydrogenation of a halogenated aromatic nitro compound. The catalyst comprises a carrier and anactive component and is characterized in that TiO2, ZrO2, neutral Al2O3 or active carbon is used as the carrier, and a bi-component metal consisting of Au and Pt, Pd, Ir or Ru is used as the active component, wherein the metal accounts for 0.1-2.0% of the carrier in terms of weight percent and the two metal elements (the Au and the Pt, Pd, Ir or Ru) in the bi-component metal keep a weight ratio of1.0:0.1-0.5. The catalyst is highly active and selective during the preparation of the halogenated arylamine by means of catalyzing the hydrogenation of the halogenated aromatic nitro compound, can achieve 100% of raw material conversion rate and 100% of target product selectivity in conditions of normal temperature, 1MPa and H2 and causes no dehalogenation reaction. In addition, the catalyst hasstable activity, can be repeatedly used for a plurality of times and can conveniently cause the catalyst to be separated from a product after the reaction. The adoption of the process for preparing the halogenated arylamine can lead to low cost and zero pollution, and has relatively great implementing value and social and economic benefits.

Description

Technical field [0001] The invention relates to a catalyst for the catalytic hydrogenation of halogenated aromatic nitro compounds to synthesize halogenated aromatic amines, in particular to a catalyst for green synthesis of halogenated aromatic amines by the efficient catalytic hydrogenation of halogenated aromatic nitro compounds and a preparation method thereof . Background technique [0002] Halogenated aromatic amines are raw materials and intermediates for the production of important chemical products such as medicines, pesticides, pigments and dyes, rubber additives, resins, photosensitive materials and petroleum solvents. Most halogenated aromatic amines are obtained by reduction of halogenated aromatic nitro compounds. The catalytic hydrogenation reduction method does not produce harmful by-products, emits very little waste gas and waste liquid, does not involve strong acid or alkali media, and has the advantages of advanced technology, high yield, good product quality,...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J37/03C07C209/36C07C211/52
Inventor 何代平焦向东江平
Owner CHINA WEST NORMAL UNIVERSITY
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