Preparation method and applications of PtCu monatomic alloy nano-catalyst

Abstract

The invention discloses a preparation method and applications of a PtCu monatomic alloy nano-catalyst. According to the preparation method, CuMgAl ternary hydrotalcite is used as a precursor, and high-dispersion and high-stability supported metal Cu nanoparticles are obtained through roasting reduction by utilizing the topological transformation characteristic of hydrotalcite; PtCl6<2-> is used asa platinum source, the potential difference between Cu<2+> / Cu and PtCl6<2-> / Pt is utilized, Pt is used for replacing Cu atoms on the surface, and Pt is dispersed on the Cu surface in a monatomic formto form the PtCu monatomic alloy nano-catalyst by regulating and controlling the content of Pt. The catalyst has an enhanced double-active-site synergistic catalytic effect, and shows good catalyticperformance when applied to a glycerol hydrogenolysis reaction, wherein the conversion rate of glycerol reaches 80-99%, the selectivity of 1,2-PDO reaches 96-99%, the catalyst has good stability in the reaction, and the activity and the selectivity are only reduced by 5-10% after continuous reaction 5 times.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a PtCu single-atom alloy nano-catalyst and the application of the catalyst in the hydrogenolysis reaction process of glycerin. Background technique [0002] With the depletion of petrochemical resources and the seriousness of environmental pollution, biodiesel, as an environmentally friendly and renewable energy, has attracted widespread attention. However, for every 9 tons of biodiesel produced, 1 ton of by-product glycerol will be produced, and the utilization of glycerol has become one of the important factors restricting the development of biodiesel industry. Different glycerol conversion pathways produce different products, among which the hydrogenolysis product 1,2-propanediol (1,2-PDO) is widely used in polyester resins, food and medicine, etc., so glycerol is converted into 1,2- The response of PDO has become a hotspot of ...

AI Technical Summary

Problems solved by technology

However, there are still many challenges in the preparation of PtCu single-atom alloys with excellent properties, such as: low Pt loading; easy to form PtCu alloys containing Pt clusters or Pt particles; Pt falls on the support instead of forming an alloy with copper; Cu is easy to agglomerate cause structural changes, etc.

Therefore, these technical difficulties become one of the factors restricting the preparation and application of PtCu single-atom alloy catalysts.

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