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Method for preparing supported palladium catalyst from carbonate solution

A supported palladium and carbonate technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical recovery, etc., can solve the problems of long catalyst preparation time, long process, poor reproducibility, etc., and save experiments The effect of cost, simple process and short preparation time

Active Publication Date: 2022-05-17
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional impregnation and roasting method has a long process, poor reproducibility, long catalyst preparation time, difficult operation, and increased cost
[0007] The second method is to prepare nanoparticles first, and then load them on a suitable carrier by some means. The challenge is to inhibit the aggregation of nanoparticles and control the effective combination of nanoparticles and carriers. This method has rarely been reported.

Method used

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  • Method for preparing supported palladium catalyst from carbonate solution
  • Method for preparing supported palladium catalyst from carbonate solution
  • Method for preparing supported palladium catalyst from carbonate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Pipette 0.5ml PdCl 2 solution, add 19.5ml of ethylene glycol, mix evenly to form a light yellow solution, and put it into No. 1 syringe; put dodecane into No. 2 syringe as the carrier phase. The flow rate of the solution in No. 1 and No. 2 syringes is controlled by a micro-injection pump. The flow rate of the No. 1 syringe solution is 0.5ml / min, and the flow rate of the No. 2 syringe solution is 1ml / min. The No. 1 and No. 2 syringes are connected by a tee. One end is connected to the Teflon tubing in the oil bath of the heating unit. The light yellow solution and dodecane pass through the tee of the continuous flow reactor at the same time to form a segment flow, and the liquid part separated by dodecane rolls forward in the small diameter reaction channel of the continuous flow reactor and enters the 122 Reaction in an oil bath at ℃, PdCl 2 Restored by ethylene glycol, the light yellow solution gradually turns gray, and palladium crystals nucleate and grow. The react...

Embodiment 2

[0033] Pipette 0.5ml PdCl 2 solution, add 19.5ml of ethylene glycol, mix evenly to form a light yellow solution, and put it into No. 1 syringe; put dodecane into No. 2 syringe as the carrier phase. The flow rate of the solution in the No. 1 and No. 2 syringes is controlled by a micro-injection pump, the flow rate of the No. 1 syringe solution is 0.7 ml / min, and the flow rate of the No. 2 syringe solution is 1.5 ml / min. The No. 1 and No. 2 syringes are connected by a tee, and the other end is connected with the polytetrafluoroethylene tube in the oil bath of the heating unit. The light yellow solution and dodecane pass through the tee of the continuous flow reactor at the same time to form a segment flow, and the liquid part separated by dodecane rolls forward in the small diameter reaction channel of the continuous flow reactor and enters the 123 Reaction in an oil bath at ℃, PdCl 2 Restored by ethylene glycol, the light yellow solution gradually turns gray, and palladium cr...

Embodiment 3

[0036] Pipette 0.5ml PdCl 2 solution, add 19.5ml of ethylene glycol, mix evenly to form a light yellow solution, and put it into No. 1 syringe; put dodecane into No. 2 syringe as the carrier phase. The flow rate of the solution in No. 1 and No. 2 syringes is controlled by a micro-injection pump, the flow rate of the solution in No. 1 syringe is 1 ml / min, and the flow rate of the solution in No. 2 syringe is 2 ml / min. The No. 1 and No. 2 syringes are connected by a tee, and the other end is connected with the polytetrafluoroethylene tube in the oil bath of the heating unit. The light yellow solution and dodecane pass through the tee of the continuous flow reactor at the same time to form a segment flow, and the liquid part separated by dodecane rolls forward in the small diameter reaction channel of the continuous flow reactor and enters the 125 Reaction in an oil bath at ℃, PdCl 2Restored by ethylene glycol, the light yellow solution gradually turns gray, and palladium cryst...

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Abstract

The invention discloses a method for preparing a supported palladium catalyst from a carbonate solution, that is, on the basis of preparing palladium nanoparticles in a continuous flow device and combining an adsorption method to prepare a supported palladium catalyst, the addition of a carbonate solution can effectively regulate the supported palladium catalyst. The method comprises the following steps: using a continuous flow device to prepare palladium nanoparticles, adding a corresponding oxide carrier, enabling the palladium nanoparticles to be loaded on the catalyst carrier by a simple adsorption method, and introducing a carbonate solution can significantly increase the loading capacity of palladium , The load rate can reach more than 90%. Compared with the traditional impregnation method, this method is easy to operate, takes less time, has good reproducibility, and has a simple catalyst preparation process. It can continuously and efficiently produce supported palladium catalysts, which not only saves production costs, but also greatly improves the preparation efficiency of catalysts.

Description

technical field [0001] The invention relates to a preparation method of a supported palladium catalyst, in particular to a method for preparing a supported palladium catalyst from a carbonate solution. Background technique [0002] Palladium catalysts are of great practical value in catalytic hydrogenation, dehydrogenation, and oxidation reactions because of their excellent activity and selectivity. Palladium catalysts are generally divided into two categories: unsupported catalysts and supported catalysts. [0003] Unsupported palladium catalysts mainly include palladium black, colloidal palladium, palladium oxide and palladium hydroxide, which are mainly used to catalyze hydrogenation reactions. Compared with unsupported catalysts, supported catalysts (such as Pd / Al 2 o 3 , Pd / C, Pd / TiO 2 ) improves the dispersibility of palladium through the effect of the carrier and then reduces the consumption of palladium, so the price is more affordable, and can be widely used in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/232
CPCB01J27/232Y02P20/584
Inventor 王川李静柳翔
Owner NANJING TECH UNIV