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Pd/mesoporous Al2O3 catalyst capable of precisely regulating number of penta-coordinated Al<3+> in Al2O3 and preparation method and application of Pd/mesoporous Al2O3 catalyst

A catalyst and precise technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, hydrogenation hydrocarbon production, etc., can solve the problem of deactivation of active components, to prevent aggregation, high acetylene Conversion rate and effect of improving atomic efficiency

Active Publication Date: 2019-12-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Palladium-based catalysts are commonly used catalysts in the hydrogenation of acetylene. The preparation of palladium nanoparticles with high dispersion can not only improve the utilization rate of palladium atoms, improve the selectivity of the reaction, but also make the adsorption mode of ethylene on palladium from the binding capacity. Strong σ bonds are transformed into relatively weak π bonds, but highly dispersed palladium nanoparticles are prone to agglomeration and deactivation of active components

Method used

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  • Pd/mesoporous Al2O3 catalyst capable of precisely regulating number of penta-coordinated Al&lt;3+&gt; in Al2O3 and preparation method and application of Pd/mesoporous Al2O3 catalyst
  • Pd/mesoporous Al2O3 catalyst capable of precisely regulating number of penta-coordinated Al&lt;3+&gt; in Al2O3 and preparation method and application of Pd/mesoporous Al2O3 catalyst
  • Pd/mesoporous Al2O3 catalyst capable of precisely regulating number of penta-coordinated Al&lt;3+&gt; in Al2O3 and preparation method and application of Pd/mesoporous Al2O3 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0032] According to the material ratio in Table 1, weigh a certain amount of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800) into the beaker and slowly drop 40mL without After water ethanol, stir to fully dissolve P123. Add 3.2mL 67wt% nitric acid and 4g aluminum isopropoxide (ISO-AL), seal with polyethylene film, and continue stirring until completely dissolved. The solution was transferred to a petri dish, covered with a perforated polyethylene film, and dried in an oven at 60°C for 48 hours to volatilize 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 2h at 400°C and 5h at 800°C to obtain mesoporous Al 2 O 3 . The mesoporous Al 2 O 3 Pour palladium into the immersion solution with a mass concentration of 0.001g / mL, immerse it at room temperature for 12h, and dry it at 110°C for 12h. After cooling, it is placed in a muffle furnace and fired...

Embodiment 4

[0034] Weigh 2.2 g of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800) into a beaker and slowly drop 40 mL of absolute ethanol, and stir to fully dissolve P123 . Add 3.2mL of 37wt% hydrochloric acid, 1g of salicylic acid and 4g of aluminum isopropoxide (ISO-AL), seal with polyethylene film, and continue to stir until completely dissolved. The solution was transferred to a petri dish, covered with a perforated polyethylene film, and dried in an oven at 60°C for 48 hours to volatilize the absolute ethanol solvent to obtain a white flake sample. Transfer the sample to a porcelain crucible and put it in a muffle furnace for 2h at 400°C and 5h at 800°C to obtain mesoporous Al 2 O 3 . The mesoporous Al 2 O 3 Pour palladium into the immersion solution with a mass concentration of 0.001g / mL, immerse it at room temperature for 12 hours, and dry it at 110°C for 12 hours. After cooling, it is placed in a muffle furnace and calcined at 500°C for...

Embodiment 5

[0036] Weigh 2.2 g of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800) into a beaker and slowly drop 40 mL of absolute ethanol, and stir to fully dissolve P123 . Add 3.2mL of 37wt% hydrochloric acid, 1g of citric acid and 4g of aluminum isopropoxide (ISO-AL), seal with polyethylene film, and continue 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 volatilize the absolute ethanol solvent to obtain a white flake sample. Transfer the sample to a porcelain crucible and put it in a muffle furnace for 2h at 400°C and 5h at 800°C to obtain mesoporous Al 2 O 3 . The obtained mesoporous Al 2 O 3 Pour palladium into the immersion solution with a mass concentration of 0.001g / mL, immerse it at room temperature for 12h, and dry it at 110°C for 12h. After cooling, it is placed in a muffle furnace and fired at 500°C for 4h to ...

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Abstract

The invention provides a Pd / mesopore Al2O3 catalyst capable of precisely regulating the number of Al<3+><penta> in Al2O3 and a preparation method and application of the Pd / mesopore Al2O3 catalyst. Thepores of mesoporous Al2O3 in the catalyst are about 10 nm, the amount of Al<3+><penta> is raised to 43% when the catalyst is compared with commercial Al2O3, and Al<3+><penta> only appears on the surface of a carrier, and can be adopted as an important anchor site for a metal-carrier interface, so that the electronic interaction between the metal and Al2O3 defects is facilitated; the number of Al<3+><penta> in Al2O3 can be regulated precisely through change of an acid in the complex and change of the firing temperature, so that highly dispersed palladium nanoparticles are synthesized, the atomic efficiency is improved, precious metal is utilized to a maximum extent, and the cost of the catalyst is reduced; and a high conversion rate of acetylene is maintained, the selectivity to ethylene in the reaction is improved greatly, and meanwhile good stability is also achieved.

Description

[0001] (1) Technical field [0002] The invention relates to a precise control Al 2 O 3 Middle Al 3+ penta Number of Pd / Mesoporous Al 2 O 3 The catalyst and its preparation method, as well as its application in the selective hydrogenation of acetylene to ethylene. [0003] (2) Background technology [0004] Ethylene is one of the most commonly used raw materials in the chemical industry. It is usually cracked from naphtha. However, a small amount of acetylene is produced during the cracking process. These traces of acetylene will poison the catalyst of the downstream polyethylene process and affect the life of the catalyst and the polyethylene product. Therefore, the removal of acetylene in the raw materials is very important. [0005] Commonly used methods for removing acetylene are: amination method, cryogenic distillation method, solvent absorption method, selective hydrogenation method, etc. Among them, the selective hydrogenation method has the advantages of no pollution, low ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44C07C11/04C07C5/09
CPCB01J23/44C07C5/09B01J35/394C07C11/04Y02P20/52
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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