An In Situ Synthesis of PD-IL/Mesoporous Al 2 o 3 Catalyst methods and their applications

An in-situ synthesis, catalyst technology, applied in the direction of organic compound/hydride/coordination complex catalyst, carbon compound catalyst, physical/chemical process catalyst, etc., can solve the problem of low ethylene selectivity, achieve large specific surface area, The effect of improving selectivity and superior catalytic performance

Active Publication Date: 2021-10-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional catalysts used in industry have very low selectivity to ethylene when the conversion of acetylene is high.

Method used

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  • An In Situ Synthesis of PD-IL/Mesoporous Al <sub>2</sub> o <sub>3</sub> Catalyst methods and their applications
  • An In Situ Synthesis of PD-IL/Mesoporous Al <sub>2</sub> o <sub>3</sub> Catalyst methods and their applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0028] Weigh 2.1 g of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800), dissolve it in 25 mL of absolute ethanol, and stir vigorously to make it evenly mixed. Measure 3 mL of 67% concentrated nitric acid and dissolve it in 25 mL of absolute ethanol, then add 4.2 g of aluminum isopropoxide, and stir vigorously to completely dissolve the aluminum isopropoxide. After the dissolution was complete, the resulting solution was slowly dropped into the ethanol solution containing P123. Add a certain amount of PdCl dropwise under vigorous stirring 2 Hydrochloric acid solution (see Table 1), the large beaker was sealed with PE film, and stirred vigorously at room temperature for 2 days. After the stirring was completed, the solution was transferred to an oven at a temperature of 60° C., and the ethanol solvent was evaporated in the oven for 3 days. The spongy sample obtained by evaporation to dryness was put into a muffle furnace and calcined...

Embodiment 6-9

[0031] Weigh 2.1 g of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800), dissolve it in 25 mL of absolute ethanol, and stir vigorously to make it evenly mixed. Measure 3 mL of 67% concentrated nitric acid and dissolve it in 25 mL of absolute ethanol, then add 4.2 g of aluminum isopropoxide, and stir vigorously to completely dissolve the aluminum isopropoxide. After the dissolution was complete, the resulting solution was slowly dropped into the ethanol solution containing P123. A certain amount of tetraammine palladium nitrate aqueous solution (see Table 1) was added dropwise under vigorous stirring, the large beaker was sealed with PE film, and vigorously stirred at room temperature for 2 days. After the stirring was completed, the solution was transferred to an oven at a temperature of 60° C., and the ethanol solvent was evaporated in the oven for 3 days. The spongy sample obtained by evaporation to dryness was put into a muffle fu...

Embodiment 10-12

[0034]Weigh 3 g of P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, Mr=5800), dissolve it in 25 mL of absolute ethanol, and stir vigorously to make it evenly mixed. Measure 5.0 mL of 67% concentrated nitric acid and dissolve it in 25 mL of absolute ethanol, then add 4.08 g of aluminum isopropoxide, and stir vigorously to completely dissolve the aluminum isopropoxide. After the dissolution was complete, the resulting solution was slowly dropped into the ethanol solution containing P123. A certain amount of tetraammine palladium nitrate aqueous solution (see Table 1) was added dropwise under vigorous stirring, the large beaker was sealed with PE film, and vigorously stirred at room temperature for 2 days. After the stirring was completed, the solution was transferred to an oven at a temperature of 60° C., and the ethanol solvent was evaporated in the oven for 3 days. The spongy sample obtained by evaporation to dryness was put into a muffle fu...

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Abstract

The invention discloses an in-situ method for synthesizing Pd-IL / Al 2 o 3 Methods and applications of mesoporous catalysts. The method comprises: (1) preparing an ethanol solution of P123; (2) dissolving concentrated nitric acid in absolute ethanol, then adding weighed aluminum isopropoxide, stirring vigorously so that the aluminum isopropoxide is completely dissolved, and dissolving the obtained solution Slowly drop into the ethanol solution of P123; (3) drop a certain concentration of palladium solution into the solution obtained in step (2), and stir vigorously at room temperature for 1-3 days; (4) after the stirring is completed, the solution is transferred to Evaporate the solvent in an oven to obtain a sponge-like sample; (5) put the sponge-like sample in a muffle furnace and bake it at 300-700°C for 3-6h to obtain the Pd / mesoporous Al 2 o 3 ; (6) in Pd / mesoporous Al 2 o 3 Ionic liquid loaded on the surface, that is, Pd-IL / mesoporous Al was prepared 2 o 3 catalyst. Pd-IL / mesoporous Al prepared by the present invention 2 o 3 The catalyst is applied in the selective hydrogenation reaction of acetylene, and exhibits excellent catalytic performance, wherein the conversion rate of acetylene is ≥99.0%, and the ethylene selectivity is ≥90%.

Description

(1) Technical field [0001] The invention relates to an in-situ method for synthesizing Pd-IL / mesoporous Al 2 o 3 Methods of catalysts and their use in the selective hydrogenation of acetylene. [0002] (2) Technical background [0003] As an important organic chemical raw material, ethylene is widely used in various fields. The ethylene raw material gas obtained from industrial production often contains 1% acetylene. The trace amount of acetylene mixed in the ethylene feed gas will poison the catalyst of the subsequent ethylene polymerization reaction and reduce the quality of polyethylene products. Therefore, it is of great significance to improve the quality of downstream products to remove acetylene in raw gas to less than 5ppm. [0004] In ethylene units, solvent absorption and selective hydrogenation are often used to remove acetylene from ethylene raw materials. Compared with the solvent absorption method, catalytic selective hydrogenation has less pollution than t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J37/08B01J37/02C07C11/04C07C5/09
CPCB01J31/28B01J37/0018B01J37/0203B01J2231/645C07C5/09C07C2531/28C07C11/04Y02P20/52
Inventor 李小年徐逸琦张群峰徐浩蒋亦舒丰枫赵佳
Owner ZHEJIANG UNIV OF TECH
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