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A method for preparing a palladium catalyst supported by chitosan-carboxymethyl cellulose composite nanoparticles

A technology of nano-microspheres and palladium catalysts, which is applied in the field of catalysis, can solve the problems of selectivity decline, etc., and achieve the effects of short reaction time, mild reaction conditions and high catalytic efficiency

Active Publication Date: 2019-03-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the conversion of acetylene is high, the generated ethylene and ethylene feed gas are usually overhydrogenated, resulting in a sharp drop in selectivity

Method used

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  • A method for preparing a palladium catalyst supported by chitosan-carboxymethyl cellulose composite nanoparticles
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  • A method for preparing a palladium catalyst supported by chitosan-carboxymethyl cellulose composite nanoparticles

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Embodiment 1

[0022] A kind of preparation method of chitosan and cellulose composite nano microsphere supported palladium catalyst, concrete steps are as follows:

[0023] (1) According to the ratio of mass volume ratio g:mL of 1:100, mix chitosan and absolute ethanol, stir magnetically for 20 minutes, and the stirring speed is 500r / min to obtain solution A; according to the mass volume ratio g:mL is The ratio of 1:100 is mixed with carboxymethyl cellulose and alkaline solution, the alkaline solution is a KOH solution with a pH value of 11, magnetically stirred for 2 hours, and the stirring speed is 500r / min to obtain solution B;

[0024] (2) According to the volume ratio of 1:1, add the solution A of step (1) into the solution B dropwise at a rate of 0.1mL / s, stir and react at room temperature for 4h, and the magnetic stirrer rotates at 500r / min. After filtering, washing with absolute ethanol for 3 times, the composite nano-microspheres of chitosan and carboxymethyl cellulose are obtained...

Embodiment 2

[0028] A kind of preparation method of chitosan and cellulose composite nano microsphere supported palladium catalyst, concrete steps are as follows:

[0029] (1) According to the ratio of mass volume ratio g:mL of 2:100, mix chitosan and absolute ethanol, stir magnetically for 25 minutes, and the stirring speed is 480r / min to obtain solution A; according to the mass volume ratio g:mL The ratio of 2:100 is mixed with carboxymethyl cellulose and alkaline solution, the alkaline solution is NaOH solution with a pH value of 12, magnetically stirred for 1.5h, and the stirring speed is 480r / min to obtain solution B;

[0030] (2) According to the volume ratio of 1:1.5, add solution A of step (1) dropwise to solution B at a rate of 0.2mL / s, stir and react at room temperature for 3h, and the magnetic stirrer rotates at 480r / min, Washing with absolute ethanol twice after filtering to obtain chitosan and carboxymethyl cellulose composite nano-microspheres;

[0031] (3) Add the nano-micr...

Embodiment 3

[0033] A kind of preparation method of chitosan and cellulose composite nano microsphere supported palladium catalyst, concrete steps are as follows:

[0034] (1) According to the ratio of mass volume ratio g:mL of 3:100, mix chitosan and absolute ethanol, stir magnetically for 30 minutes, and the stirring speed is 450r / min to obtain solution A; according to the mass volume ratio g:mL The ratio of 3:100 is mixed with carboxymethyl cellulose and alkaline solution, the alkaline solution is ammonia water with a pH value of 11, magnetically stirred for 1 hour, and the stirring speed is 450r / min to obtain solution B;

[0035] (2) According to the volume ratio of 1:2, add the solution A of step (1) into the solution B dropwise at a rate of 0.5mL / s, stir and react at room temperature for 4h, and the magnetic stirrer rotates at 450r / min. After filtering, washing with absolute ethanol for 3 times, the composite nano-microspheres of chitosan and carboxymethyl cellulose are obtained;

...

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PUM

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Abstract

A method for preparing a palladium catalyst supported by chitosan-carboxymethyl cellulose composite nanoparticles is disclosed. The method includes mixing chitosan with absolute alcohol to obtain a solution A; mixing carboxymethyl cellulose with an alkaline solution to obtain a solution B; adding the solution A dropwise into the solution B; reacting the mixture at room temperature under stirring;performing filtration and then absolute alcohol washing to obtain chitosan-carboxymethyl cellulose composite nanoparticles; adding the nanoparticles into absolute alcohol, then adding a palladium saltsolution, and reacting the liquid mixture at room temperature under magnetic stirring; performing filtration and washing with absolute alcohol, and vacuum drying to obtain the palladium catalyst supported by chitosan-carboxymethyl cellulose composite nanoparticles. The catalyst has good catalytic effects, a simple preparation process, a high catalytic efficiency, convenient separation and a low cost and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of palladium catalyst supported by chitosan and carboxymethyl cellulose composite nano microspheres. Background technique [0002] Ethylene is the most important basic raw material in petrochemical industry, known as "the mother of petrochemical industry". Selective hydrogenation of acetylene is a hot topic at present, and there are many reports at home and abroad, but its research content is mainly used to remove trace amounts of acetylene in the process of producing ethylene from petroleum hydrocarbon cracking. The process and catalysts of hydrogen to ethylene are rarely explored, and the corresponding large-scale industrial application has not been reported. Polymer-supported metal catalysts have become a research hotspot because of their high catalytic activity and stereoselectivity, good stability and reusability. [0003] In recent years...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J35/08C07C11/04C07C5/09
CPCC07C5/09B01J31/28C07C2531/28B01J35/23B01J35/399B01J35/51C07C11/04Y02P20/52
Inventor 何亮陈佳静关清卿宁平胡柠檬杨成寰
Owner KUNMING UNIV OF SCI & TECH
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