Preparation method of Pt/C catalyst, Pt/C catalyst and application of Pt/C catalyst

A kind of catalyst and technology, applied in the field of preparing Pt/C catalyst, can solve problems such as unfavorable large-scale production, deactivation, catalyst activity decline, etc., and achieve the effects of being conducive to large-scale production, long service life and complete morphology

Inactive Publication Date: 2019-10-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although the above-mentioned method of adding a poisoning agent to the entire reaction system to reduce the activity of the catalyst can achieve high selectivity to hydroxylamine aromatics, the partially poisoned catalyst will usually experience a decrease in activity or even complete deactivation after one operation cycle, and then make the catalyst unrecyclable
In addition, the poisoning agent added in the reaction system may have compatibility with the product hydroxylamine aromatics, which makes subsequent processing difficult
[0007] Therefore, in 2016, Chen et al. published a method of adding ethylenediamine to the platinum precursor solution to synthesize ethylenediamine chelated Pt nanowires, which has a selectivity of up to 100% for the hydrogenation of nitrobenzene to phenylhydroxylamine. Sex (Interfacialelectronic effects control the reaction.2016.G.Chen,C.Xu,X.Huang,J.Ye,L.Gu,G.Li, Z.Tang,B.Wu,H.Yang,Z.Zhao, Z.Zhou, G.Fu, and N.Zheng.Nature Materials. 15:564-569), those skilled in the art should know that organic amines can cause Pt nano-catalysts to be poisoned and inhibit activity, so Pt nano-catalysts will not be directly Direct post-modification, in addition, this in-situ method of preparing organic amine-modified Pt nanocatalysts, the noble metal precursor platinum acetylacetonate used is not easy to obtain, the preparation process is complicated, and toxic gases and solvents such as CO and DMF are used, so it is difficult to prepare in batches , not conducive to large-scale industrial production

Method used

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  • Preparation method of Pt/C catalyst, Pt/C catalyst and application of Pt/C catalyst
  • Preparation method of Pt/C catalyst, Pt/C catalyst and application of Pt/C catalyst
  • Preparation method of Pt/C catalyst, Pt/C catalyst and application of Pt/C catalyst

Examples

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Embodiment 1

[0076] Preparation of organic amine-modified Pt / C catalyst (the molar ratio of organic amine to Pt is 100:1)

[0077] According to the method provided by the present invention, take 2g of 2% Pt / C catalyst in a 250mL beaker, add 100mL of ethanol, stir until the Pt / C is uniformly dispersed, add 1.23g of ethylenediamine (Ethylenediamine, EDA) dropwise to the beaker, Ethylenediamine: Pt=100:1 (molar ratio), forming a precursor mixture; continue to stir the precursor mixture for 3 hours; filter the precursor mixture and wash 3 times with ultrapure water and dry to obtain the organic compound of the present invention. Amine-modified Pt / C catalyst, the modified catalyst obtained in this example is EDA-2%Pt / C (100:1).

[0078] figure 1 (a) is the TEM figure of the Pt / C catalyst (comparative example 1) before modification; figure 1 (b) TEM image of the modified EDA-2%Pt / C catalyst prepared by the method provided by the present invention. figure 2 In order to provide the method wi...

Embodiment 2

[0088] Preparation of organic amine-modified Pt / C catalyst (the molar ratio of organic amine to Pt is 100:1)

[0089] This example adopts the preparation reaction conditions similar to Example 1, and the only difference from Example 1 is that the organic amine used in the reaction is tris(2-aminoethyl)amine [Tris(2-aminoethyl)amine, TAEA]. The amine mixed solution is an aqueous solution, and the organic amine-modified Pt / C catalyst of the present invention is obtained. The modified catalyst obtained in this example is TAEA-2%Pt / C (100:1). The catalytic reaction conditions of this embodiment are also the same as that of Embodiment 1.

Embodiment 3

[0091] Preparation of organic amine-modified Pt / C catalyst (the molar ratio of organic amine to Pt is 100:1)

[0092] This example adopts the preparation reaction conditions similar to Example 1, and the only difference from Example 1 is that the organic amine used in the reaction is N-methylmorpholine (N-Methylmorpholine, NMM), and the organic amine mixed solution is an ethanol solution. The organic amine-modified Pt / C catalyst of the present invention was obtained, and the modified catalyst obtained in this example was NMM-2%Pt / C (100:1). The catalytic reaction conditions of this embodiment are also the same as that of Embodiment 1.

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Abstract

The invention provides a method for preparing a modified Pt/C catalyst. The method comprises the steps that the Pt/C catalyst is immersed in an organic amine mixed solution to form a precursor mixture; the organic amine mixed solution comprises a component A and a component B, the component A is organic amine, and the component B is at least one solvent mutually solved with the organic amine; theprecursor mixture is stirred; and the precursor mixture is filtered through suction, a filter object is washed, and thus the modified Pt/C catalyst is obtained.

Description

technical field [0001] The invention relates to a method for preparing a Pt / C catalyst, in particular to a method for modifying a Pt / C catalyst with an organic amine. Background technique [0002] Hydroxylamine aromatic hydrocarbon is an organic intermediate used in the synthesis of important fine chemical products such as pesticides and medicines, and has broad market application prospects. Hydroxylamine aromatics are generally synthesized from corresponding nitroaromatic compounds through stoichiometric reaction, electrochemical reduction or catalytic hydrogenation. [0003] The stoichiometric reaction includes the metal reduction method and the alkali sulfide reduction method. Metal iron, tin and sodium sulfide are used as reducing agents to reduce the nitro group through the stoichiometric reaction. Disabled. The electrochemical reduction method has mild operating conditions and controllable products, but the current utilization rate is not high, and the requirements f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28C07C213/02C07C215/76C07D231/20
CPCB01J31/28B01J2231/641C07C213/02C07D231/20C07C215/76
Inventor 郑南峰徐佳园刘圣杰陈洁
Owner XIAMEN UNIV
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