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In-situ monatomic Pd/mesoporous Al2O3 catalyst as well as preparation method and application thereof

A catalyst and atomic technology, applied in the field of in-situ single-atom Pd/mesoporous alumina catalyst and its preparation and application, can solve the problems of reducing activity and service life, poisoning, affecting the quality of polyethylene products, etc., to improve atomic efficiency , high activity, and the effect of reducing the aggregation of metal atoms

Active Publication Date: 2019-11-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ethylene gas obtained through this process often contains about 0.3%-3% of acetylene; this small amount of acetylene will poison the Ziegler-Natta catalyst in the subsequent production of polyethylene, reduce its activity and service life, and affect the Product quality of polyethylene

Method used

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  • In-situ monatomic Pd/mesoporous Al2O3 catalyst as well as preparation method and application thereof
  • In-situ monatomic Pd/mesoporous Al2O3 catalyst as well as preparation method and application thereof
  • In-situ monatomic Pd/mesoporous Al2O3 catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0027] According to the material ratio in Table 1, a certain amount of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800) was weighed and slowly added dropwise to 40 mL of After adding water and ethanol, stir to fully dissolve P123. Add 3.2mL67wt% nitric acid and 4g aluminum isopropoxide (ISO-AL), drop a certain amount of PdCl under vigorous stirring 2 hydrochloric acid solution, sealed with polyethylene film, and continued to stir until completely dissolved. The solution was transferred to a Petri dish, covered with a polyethylene film with holes, and dried in an oven at 60°C for 48 hours to evaporate the absolute ethanol solvent to obtain a sponge-like sample. Transfer the sample to a porcelain crucible and put it in a muffle furnace for 4 hours at 400°C to obtain the single-atom Pd / mesoporous Al 2 o 3 catalyst.

Embodiment 4-6

[0029] Weigh a certain amount of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800), slowly add 40mL of absolute ethanol dropwise in a beaker, stir to fully dissolve P123 . Add 3.2mL of 67wt% nitric acid and 4g of aluminum isopropoxide (ISO-AL), drip a certain amount of tetraammine palladium nitrate aqueous solution under vigorous stirring, seal with a polyethylene film, and continue stirring until completely dissolved. The solution was transferred to a Petri dish, covered with a polyethylene film with holes, and dried in an oven at 60°C for 48 hours to evaporate the absolute ethanol solvent to obtain a sponge-like sample. Transfer the sample to a porcelain crucible and put it in a muffle furnace for 4 hours at 400°C to obtain the single-atom Pd / mesoporous Al 2 o 3 catalyst.

Embodiment 7

[0031] Weigh 2.2g of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800), slowly add 40mL of absolute ethanol dropwise in a beaker, stir to fully dissolve P123 . Add 3.2mL of 37wt% hydrochloric acid + 1g of salicylic acid and 4g of aluminum isopropoxide (ISO-AL), drip a certain amount of tetraammine palladium nitrate aqueous solution under vigorous stirring, seal with a polyethylene film, and continue stirring until completely dissolved. The solution was transferred to a Petri dish, covered with a polyethylene film with holes, and dried in an oven at 60°C for 48 hours to evaporate the absolute ethanol solvent to obtain a sponge-like sample. Transfer the sample to a porcelain crucible and put it in a muffle furnace for 4 hours at 400°C to obtain the single-atom Pd / mesoporous Al 2 o 3 catalyst.

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Abstract

The invention provides an in-situ monatomic Pd / mesoporous Al2O3 catalyst as well as a preparation method and application thereof. The catalyst is prepared by the following method: dissolving P123 intoabsolute ethyl alcohol; adding an acid and aluminum isopropoxide, dropwise adding a palladium solution while stirring, continuously stirring until the palladium solution is completely dissolved, thendrying at 50-80 DEG C to obtain a spongy sample, putting the sample into a muffle furnace, heating to 300-700 DEG C, and roasting for 4-9 hours to obtain the in-situ monatomic Pd / mesoporous Al2O3 catalyst. Palladium single atoms on the surface of a carrier can be better anchored through strong chemical bonds by an in-situ synthesis method; the catalyst has the advantages of reduction of highly dispersed metal atom aggregation, improvement of the atom efficiency, maximum utilization of precious metals, reduction of the cost of the catalyst, maintenance of a high acetylene conversion rate in anacetylene hydrogenation process, and great improvement of the selectivity and the stability of ethylene in the reaction.

Description

[0001] (1) Technical field [0002] The invention relates to an in-situ single-atom Pd / mesoporous Al 2 o 3 Catalyst and its preparation method, and its application in the reaction of acetylene selective hydrogenation to ethylene. [0003] (2) Background technology [0004] Industrial ethylene is mainly produced by cracking raw materials such as naphtha and diesel. However, the ethylene gas obtained by this process often contains about 0.3%-3% of acetylene; this small amount of acetylene will poison the Ziegler-Natta catalyst in the subsequent production of polyethylene, reduce its activity and service life, and affect the Polyethylene product quality. Therefore, it is of great industrial significance to remove a small amount of acetylene in ethylene feed gas. [0005] Among the commonly used methods for removing acetylene, the selective hydrogenation method is widely used because of its advantages of no pollution, low energy consumption, and simple process. The preparation...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J35/10C07C5/09C07C11/04
CPCB01J23/44C07C5/09C07C2523/44B01J35/647C07C11/04Y02P20/52
Inventor 张群峰周静黄伟民马磊卢春山丰枫李小年
Owner ZHEJIANG UNIV OF TECH
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