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Pdx/Cu monatomic catalyst for selective hydrogenation of C4 and preparation method for Pdx/Cu monatomic catalyst

A selective hydrogenation and catalyst technology, applied in physical/chemical process catalysts, hydrogenation hydrocarbon production, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of multiple and complex molecules and reactions, and achieve the cost of catalysis Effects of low, selectivity improvement, and long catalyst life

Inactive Publication Date: 2019-05-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the Pd-Cu catalysts disclosed in the above patents are mainly used in the selective hydrogenation reaction of C2-C3 fractions. The selective hydrogenation reaction of C4 involves more and more complex molecules and reactions, and C2-C3 cannot be selectively hydrogenated. The hydrogenation catalyst is directly applied to the C4 system

Method used

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  • Pdx/Cu monatomic catalyst for selective hydrogenation of C4 and preparation method for Pdx/Cu monatomic catalyst
  • Pdx/Cu monatomic catalyst for selective hydrogenation of C4 and preparation method for Pdx/Cu monatomic catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Preparation of PdCu / Al by Co-impregnation 2 o 3 Catalyst, wherein Pd content 0.18%, Cu content 15%, concrete steps are as follows:

[0050] (a) Calculate the consumption of corresponding precursor copper nitrate and palladium nitrate, and configure solution according to the volume of corresponding solution impregnated with aluminum oxide equivolume;

[0051] (b) adding the solution dropwise evenly on the alumina carrier, so that the carrier just saturates and absorbs the prepared solution;

[0052] (c) aging the impregnated carrier at room temperature for 3 hours, and drying at 100° C. for 12 hours;

[0053] (d) Calcining the catalyst obtained in (c) at 500° C. for 5 h.

[0054] After the prepared catalyst was reduced at 450°C, it was characterized by EXAFS, and the obtained data was fitted to obtain the coordination number (CN, coordination number) of Pd. After the fitting, CN(Pd-Pd)=0 , CN(Pd-Cu)=11.2, which proves that Pd is surrounded by Cu and exists in the cat...

Embodiment 2

[0058] Preparation of PdCu / CeO by Galvanic displacement method 2 Catalyst, wherein Pd content 0.12%, Cu content 3.5%, concrete steps are as follows:

[0059] (a) calculate the consumption of precursor copper nitrate and palladium nitrate according to load data;

[0060] (b) Cu(acac) 2 The solution is evenly added dropwise on the catalyst carrier, so that the carrier is just saturated to absorb the prepared solution;

[0061] (c) Aging for 3 hours and drying at 80°C for 18 hours;

[0062] (d) calcining at 500°C for 4h;

[0063] (e) reducing the catalyst obtained in (d) at 300° C. for 2 hours;

[0064] (f) The catalyst obtained in (e) is subjected to metal replacement reaction in an ultrasonic reactor, and the replacement metal solution is Pd(acac) 2 solution;

[0065] (g) Vacuum drying at room temperature for 48 h.

[0066] After reducing the prepared catalyst at 450°C, perform EXAFS characterization, the obtained data is fitted to obtain the coordination number (CN) of ...

Embodiment 3

[0069] Preparation of PdCu / SiO by Step-wise Impregnation Method 2 Chemical agent, wherein Pd content 0.12%, Cu content 4.2%, concrete steps are as follows:

[0070] (a) Calculate the amount of precursor cupric chloride and palladium chloride according to the load data, and prepare the solution according to the volume corresponding to the equal volume impregnation of silicon oxide;

[0071] (b) the cupric chloride solution is evenly added dropwise on the catalyst carrier, so that the carrier is just saturated and adsorbed with the prepared solution;

[0072] (c) Aging for 3 hours and drying at 80°C for 18 hours;

[0073] (d) calcining at 450°C for 4h;

[0074] (e) palladium chloride solution is evenly added dropwise on the catalyst carrier, so that the carrier is just saturated and adsorbed with the prepared solution;

[0075] (f) Aging for 3 hours and drying at 80°C for 18 hours;

[0076] (g) Calcination at 550°C for 5h.

[0077] After reducing the prepared catalyst at 45...

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Abstract

The invention relates to an unsaturated C4 selective hydrogenation catalyst and a preparation method and application thereof. The catalyst is prepared from Pd, Cu and a carrier. The catalyst is used for selective hydrogenation removal of C4 alkynes and dienes, unsaturated C4 molecules are converted into butene through hydrogenation, and therefore the purpose of removing unsaturated C4 is achieved.

Description

technical field [0001] The invention relates to a catalyst used in a C4 selective hydrogenation process and its preparation and application. Specifically, it is a single-atom-level bimetallic catalyst and its application in the selective hydrogenation of unsaturated C4. Background technique [0002] Low-carbon olefins (C 2 -C 4 ) is an important organic raw material, which is widely used in the production of plastics by polymerization, the synthesis of three major organic materials, and the synthesis of fine chemicals. 1-butene, 2-butene and isobutene in C4 are common polymerized monomers, however, the cracked C4 fraction contains a certain amount of diolefins and alkynes, which will seriously affect the subsequent polymerization of monoolefins, such as poisoning the catalyst , affecting the reaction rate, reducing product quality, endangering production safety, etc. Therefore, it is necessary to carry out strict de-alkyne and de-diene treatment on industrial raw material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C11/08C07C5/05C07C5/09
Inventor 侯瑞君孙克宁杨秋辰简洪超
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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