High-dispersion single-atom Pd/mesoporous Al2O3 catalyst, and preparation method and application thereof

A catalyst, highly dispersed technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, carbon compound catalysts, etc., can solve problems such as poor ethylene selectivity, affecting catalyst service life, etc. Improved selectivity, high atomic utilization, and cost reduction

Active Publication Date: 2019-12-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the palladium-based catalysts traditionally used in industry have better catalytic activity, they have poor ethylene selectivity, which wil

Method used

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  • High-dispersion single-atom Pd/mesoporous Al2O3 catalyst, and preparation method and application thereof
  • High-dispersion single-atom Pd/mesoporous Al2O3 catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0033] Weigh P123 (0.2g, polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800) in a beaker, slowly add 40mL of absolute ethanol dropwise, and stir to make P123 fully dissolve. Add 0.64mL of 37wt% hydrochloric acid + 0.2g of citric acid, aluminum isopropoxide (0.4g), 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. The sample was transferred to a porcelain crucible and baked in a muffle furnace at 400 °C for 4 h to obtain mesoporous Al 2 o 3 .

[0034] Weigh a certain amount of PdCl 2 Dissolve in concentrated hydrochloric acid, transfer to a volumetric flask, add a certain amount of deionized water to the corresponding scale, and prepare a chloropalladium acid solution with a mass concentration of palladium...

Embodiment 6

[0036] With reference to the operation of embodiment 5, the only difference is that the carrier is replaced by a specific surface area of ​​60m 2 / g of alumina to prepare a simple palladium-alumina catalyst.

Embodiment 7

[0038]With reference to the operation of Example 5, the only difference is that the carrier is replaced with a specific surface area of ​​420m 2 / g of alumina to prepare a simple palladium-alumina catalyst.

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Abstract

The invention provides a high-dispersion single-atom Pd/mesoporous Al2O3 catalyst, and a preparation method and application thereof. According to the invention, mesoporous Al2O3 with more surface defects is synthesized in situ, and palladium atoms are stably loaded on the mesoporous Al2O3 with more defect sites by an atomic lamination technology, so that anchoring with the maximum number of the palladium atoms with unsaturated penta-coordinated Al<3+> in mesopores can be effectively realized, and therefore, the single-atom Pd catalyst with a higher dispersion degree can be prepared. Atomic efficiency can be effectively improved, noble metal can be utilized to the maximum extent, and cost of the catalyst can be reduced. Moreover, the high-dispersion single-atom Pd/mesoporous Al2O3 catalystcan maintain high acetylene selectivity in an acetylene selective hydrogenation process, and ethylene selectivity can be greatly improved.

Description

[0001] (1) Technical field [0002] The invention relates to a highly dispersed single-atom Pd / mesoporous Al 2 o 3 Catalyst and its preparation method, and its application in acetylene hydrogenation reaction. [0003] (2) Background technology [0004] Ethylene is one of the most important chemical products in the world and is widely used in various fields such as synthetic plastics, rubber, fibers, medicine, pesticides and dyes. Industrial ethylene is mainly produced through the cracking of raw materials such as naphtha and diesel, but in the process of preparing ethylene gas, about 0.3%-3% of acetylene is often generated; these traces of acetylene will poison the Ziegler-Natta of the downstream polyethylene process The catalyst will not only reduce the activity and service life of the catalyst, but also seriously affect the product quality of the polyethylene process. Therefore, the removal of trace acetylene in raw gas has important industrial significance. [0005] The ...

Claims

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Application Information

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