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

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...

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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

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