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Method for preparing loading type nano Pd/C catalyst from colloidal solution

A colloidal solution and catalyst technology, applied in the field of catalysis, can solve problems such as short service life, poor stability of supported nano-palladium catalyst, complicated preparation process, etc., and achieve the effects of reducing production costs, avoiding organic pollution, and good repeatability

Inactive Publication Date: 2007-05-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation process is still very complicated, and the obtained supported nano-palladium catalyst has poor stability and short service life.

Method used

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  • Method for preparing loading type nano Pd/C catalyst from colloidal solution
  • Method for preparing loading type nano Pd/C catalyst from colloidal solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 0.1673gPdCl 2 After adding 10ml of water, add 0.6178g of concentrated hydrochloric acid, and dissolve it completely under ultrasound in a water bath at 50°C. After dissolving, add it into 150mL water containing 0.0534g of Brij35 and 0.0601g of Tween20, and add 1.5g / L NaBH dropwise 4 75mL aqueous solution, the orange solution quickly turned black to obtain a palladium colloidal solution, then added 2g of activated carbon and stirred for 1h, filtered, fully washed with water, and rinsed with THF to obtain 5% Pd / C.

Embodiment 2

[0021] Take by weighing the catalyst 0.25g that makes in the embodiment 1, join in the autoclave of 70ml, then add respectively reaction substrate o-nitrochlorobenzene, m-nitrochlorobenzene and p-nitrochlorobenzene 3.0g, solvent THF30ml, Seal the kettle, check for leaks, replace the air with nitrogen for 3 times, then replace the nitrogen with hydrogen for 3 times, start heating, when the temperature reaches 80°C, pressurize to 2.5MPa, and the reaction time is 1 hour, repeat the reaction operation, the reaction As a result, all 100% conversion of o-nitrochlorobenzene, m-nitrochlorobenzene and p-nitrochlorobenzene from the second time, the selectivity of o-nitroaniline, m-nitroaniline and p-nitroaniline is more than 99.7%. And after the catalyst is recycled for 40 times, the activity does not decrease significantly.

Embodiment 3

[0023] Take by weighing the catalyst 0.2g that makes in the embodiment 1, join in the autoclave of 70ml, add reaction substrate α-olefin polymer 8g, solvent cyclohexane 15ml, solution color is brownish yellow, seal kettle, check for leaks, Replace the air with nitrogen for 3 times, then replace the nitrogen with hydrogen for 3 times, start heating, when the temperature reaches 160°C, pressurize to 3.0MPa, after 2 hours of reaction, the brownish yellow color of the solution fades and turns into water white.

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Abstract

The invention relates to a method for using colloid solution to prepare carrier nanometer Pd / C catalyst, wherein said method comprises that using chemical reduction to process palladium salt to prepare the nanometer palladium colloid solution with stable surface activity, then using some carrier to absorb it to obtain the palladium colloid, to obtain the nanometer palladium catalyst with different loaded amounts. The inventive catalyst can be used in hydrogenation.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and specifically relates to a preparation method of a loaded nano-precious metal catalyst used in the hydrogenation process of various organic compounds in industries such as petrochemical, pharmaceutical, dyestuff, pesticide and rubber additives. Selective hydrogenation of radicals, aromatic rings, alkynes, alkenes, ketones, aldehydes, etc. Background technique [0002] Nano-metals have special physical and chemical properties different from metal atoms and bulk metals, so they are widely used in optical materials, microelectrode reactions, bioengineering and medicine, microelectronics industry, and catalytic industry. Nano-metals have attracted great attention in the field of catalysis because of their large specific surface area and specific activity, especially supported noble metal catalytic systems, which can control the activity of catalysts by adjusting the size of nano-metal particles....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J21/18B01J32/00B82B3/00
Inventor 吕连海辛俊娜杜文强荣泽明王越
Owner DALIAN UNIV OF TECH
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