Method for preparing polymolecularity metal catalyst in load type from plasma

A metal catalyst, high dispersion technology, applied in the field of catalysis, to achieve the effect of saving cost, improving catalytic activity and improving economic effect

Inactive Publication Date: 2004-10-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the choice of metal precursors is a big problem. It requires easy gasification, good thermal stability during transportation, easy preparation, high purity, and easy and thorough thermal decomposition. The most commonly used metal precursors are metal carbonyl compounds. (M(CO)x), it is still difficult to apply to the actual industrial production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 2% palladium was loaded onto HZSM-5 molecular sieve by impregnation method, and then dried at 110°C for 4 hours. The catalyst is placed between two electrodes in a glow discharge plasma device. After sealing, start vacuuming to 10Pa, adjust the flow rate of argon to maintain the pressure of the vacuum system at 100Pa, and then continuously apply a DC voltage of 1000V between the electrodes, and the treatment time is 60 minutes. After taking out the catalyst, put it into a roasting furnace at 500°C for 4 hours to get Pd / HZSM-5. Through high-resolution transmission electron microscopy, it can be seen that the particle diameter of the active component Pd is about 5nm.

Embodiment 2

[0018] 4% Mo was loaded onto activated alumina by impregnation method, and then dried. The catalyst is placed between two electrodes in a glow discharge plasma device. After sealing, start vacuuming to 10Pa, adjust the nitrogen flow rate to maintain the pressure of the vacuum system at 50Pa, and then continuously apply a DC voltage of 500V between the electrodes, and the treatment time is 50 minutes. After taking out the catalyst, put it in a roaster at 500°C for 7 hours to get Mo / Al 2 o 3 , through a high-resolution transmission electron microscope, it can be seen that the particle diameter of the active component Mo is about 1-10 nm.

Embodiment 3

[0020] For the catalyst obtained in Example 2, cobalt nitrate solution was added to make the Co content on the catalyst 3%, stirred for 30 minutes, left to stand for 12 hours, and then dried. The catalyst is placed between two electrodes in a glow discharge plasma device. After sealing, start vacuuming to 10Pa, adjust the nitrogen flow rate to maintain the pressure of the vacuum system at 50Pa, and then continuously apply a DC voltage of 500V between the electrodes, and the treatment time is 50 minutes. After taking out the catalyst, put it into a roaster at 500°C for 7 hours to get CoMo / Al 2 o 3 , through a high-resolution transmission electron microscope, it can be seen that the particle diameters of the active components Mo and Co are about 1-10nm.

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Abstract

A process for preparing the high-dispersing carried catalyst by plasma includes carrying active components by dipping method or ion exchange method, drying, putting the catalyst in discharging tube, vacuumizing to 10-20 Pa, filling N2, O2, H2, or inertial gas to 10-1000 Pa, applying 200-5000 V across two electrodes for plasma treating for 10-500 min, and calcining at 300-600 deg.C for 3-7 hrs.

Description

technical field [0001] The invention belongs to the technical field of catalysis, in particular to a method for preparing a high-dispersion supported metal catalyst by plasma. Background technique [0002] Supported catalyst is a commonly used catalyst in the chemical industry. It can evenly disperse expensive metal active components on the surface of the catalyst, thereby saving the amount of metal used and improving the activity of the catalyst. The commonly used methods for preparing supported catalysts include impregnation method, ion exchange method, sol-gel method and co-precipitation method, etc., and these methods have been successfully applied in industrial production. However, with the emphasis on environmental protection and the demand for energy, more and more attention has been paid to catalysts with high activity and low price, so more and more new catalyst preparation methods have emerged. As mentioned in 1998, 14 (9): 769 "Act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/02B01J37/34
Inventor 刘昌俊于开录张月萍
Owner TIANJIN UNIV
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