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Preparation method of bagasse pith-based modified polysaccharide-loaded palladium nanoparticle catalyst

A palladium nano-catalyst technology is applied in the field of preparation of a sucrose base-modified polysaccharide-supported palladium nano-particle catalyst, which can solve the problems of low selectivity of the palladium catalyst, and achieve the effects of practicable principle, simple process operation, and environmentally friendly process.

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

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Problems solved by technology

[0004] The invention provides a preparation method of a sugarcane pith-based modified polysaccharide-loaded palladium nanoparticle catalyst, which overcomes the drawbacks of the current low selectivity of palladium catalysts

Method used

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  • Preparation method of bagasse pith-based modified polysaccharide-loaded palladium nanoparticle catalyst

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Embodiment 1

[0026] A preparation method for a sucrose-based modified polysaccharide-loaded palladium nanoparticle catalyst for catalyzing the semihydrogenation of acetylene, comprising the following steps:

[0027] (1) The preparation method of sugarcane pith polysaccharide is as follows: add 20.0 g of sugarcane pith into 400 mL of 9% sodium hydroxide solution as a solvent, react in a water bath at 25 °C for 30 min at 300 rpm, and add the extract to into dehydrated ethanol, the volume ratio of the extract to dehydrated ethanol is 1:9, set aside for precipitation, filter, and freeze-dry for 48 hours to obtain sucrose pith polysaccharide solid;

[0028] Preparation of polysaccharide-based porous carrier: Take 1.0g sucrose polysaccharide and add it to a flask filled with 10mL of 4% sodium hydroxide solution, heat to 60°C to dissolve, cool to room temperature, add 0.05g potassium peroxodisulfate and 0.05g sodium thiosulfate (as a redox initiator), stirred for about 15min to initiate free radi...

Embodiment 2

[0033] A preparation method for a sucrose-based modified polysaccharide-loaded palladium nanoparticle catalyst for catalyzing the semihydrogenation of acetylene, comprising the following steps:

[0034] (1) The preparation method of sugarcane pith polysaccharide is as follows: add 20.0 g of sugarcane pith into 400 mL of 9% sodium hydroxide solution as a solvent, react in a water bath at 25 °C for 30 min at 300 rpm, and add the extract to into dehydrated ethanol, the volume ratio of the extract to dehydrated ethanol is 1:9, set aside for precipitation, filter, and freeze-dry for 48 hours to obtain sucrose pith polysaccharide solid;

[0035] Preparation of polysaccharide-based porous carrier: Take 1.0g sucrose polysaccharide and add it to a flask filled with 10mL of 4% sodium hydroxide solution, heat to 60°C to dissolve, cool to room temperature, add 0.06g potassium peroxodisulfate and 0.06g sodium thiosulfate (as a redox initiator), stirred for about 12min to initiate free radi...

Embodiment 3

[0040] A preparation method for a sucrose-based modified polysaccharide-loaded palladium nanoparticle catalyst for catalyzing the semihydrogenation of acetylene, comprising the following steps:

[0041] (1) The preparation method of sugarcane pith polysaccharide is as follows: add 20.0 g of sugarcane pith into 400 mL of 9% sodium hydroxide solution as a solvent, react in a water bath at 25 °C for 30 min at 300 rpm, and add the extract to into dehydrated ethanol, the volume ratio of the extract to dehydrated ethanol is 1:9, set aside for precipitation, filter, and freeze-dry for 48 hours to obtain sucrose pith polysaccharide solid;

[0042] Preparation of polysaccharide-based porous carrier: Take 1.0g sucrose polysaccharide and add it to a flask filled with 15mL of 4% sodium hydroxide solution, heat to 60°C to dissolve, cool to room temperature, add 0.06g potassium peroxodisulfate and 0.05g sodium thiosulfate (as a redox trigger), stirred for about 15min to trigger free radical...

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Abstract

The invention discloses a preparation method of a bagasse pith-based modified polysaccharide-loaded palladium nanoparticle catalyst. The preparation method comprises the following steps: modifying bagasse pith polysaccharide by using a modifier to obtain modified polysaccharide with amino sites on molecular chains, and preparing a polysaccharide-based porous carrier by using a cross-linking agent;pulverizing the polysaccharide-based porous carrier into powder, and performing sieving; and weighing the sieved carrier powder into ethanol, then dropwise adding a palladium solution, carrying out mixing, and then carrying out stirring, filtering, washing and vacuum drying to obtain the bagasse pith-based modified polysaccharide-loaded palladium nanoparticle catalyst. The nano particles has ethylene selectivity of up to 99.9% in catalyzing an acetylene semi-hydrogenation reaction, and the defects of high acetylene conversion rate and low ethylene selectivity of the traditional palladium-based catalyst are overcome. The method develops a new way is developed for high-value utilization of bagasse resources; the used solvent ethanol is cheap, is easy to obtain and is green and clean; and the preparation process of the catalyst is simple and convenient.

Description

technical field [0001] The method relates to the fields of utilization of petrochemical and agricultural and forestry waste resources, in particular to a method for preparing a palladium nanoparticle catalyst supported by sugarcane pith-based modified polysaccharides. Background technique [0002] Ethylene is an important intermediate in the petrochemical industry and is mainly used to produce polyethylene materials. my country's traditional ethylene industry uses liquid petroleum as raw material to obtain ethylene products through high-temperature steam cracking. However, 0.5-2% of acetylene will be produced during the cracking process, and a small amount of acetylene will cause side reactions during the synthesis of polyethylene materials and produce "green oil". "Green oils" are deactivated by "poisoning" with acetylene hydrogenation catalysts. In order to prevent the occurrence of side reactions, it is necessary to reduce the acetylene content in ethylene to PPM level....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C07C5/09C07C11/04
CPCB01J31/06C07C5/09B01J2231/645C07C2531/06C07C11/04Y02P20/52
Inventor 何亮陈冬杨世波关清卿陈佳静
Owner KUNMING UNIV OF SCI & TECH
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