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Regeneration method for deactivated transition metal catalyst

A deactivated catalyst, transition metal technology, applied in catalyst regeneration/reactivation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve permanent catalyst deactivation, metal particle growth Large sintering and other problems, to achieve the effect of removing carbon deposits, eliminating carbon deposits, and excellent catalytic performance

Inactive Publication Date: 2019-04-19
LANGFANG INST OF PROCESS ENG CAS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the transition metal catalyst in the prior art realizes the regeneration process, it is easy to cause the metal particles to grow and sinter, resulting in the permanent deactivation of the catalyst. The purpose of the present invention is to provide a regeneration method for the transition metal deactivated catalyst. The method It can realize the regeneration of transition metal catalysts deactivated by carbon deposition and metal sintering at the same time. The regeneration method has the characteristics of simple operation and high regeneration efficiency. life span

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  • Regeneration method for deactivated transition metal catalyst
  • Regeneration method for deactivated transition metal catalyst
  • Regeneration method for deactivated transition metal catalyst

Examples

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Embodiment 1

[0060] The present embodiment provides a kind of regeneration method of transition metal deactivated catalyst, described method comprises the following steps:

[0061] (1) Ni / Al that will be deactivated 2 o 3 The catalyst is calcined in the air, the gas space velocity is 2000h -1 , the calcination temperature is 1000°C, and the calcination time is 12h;

[0062] (2) The catalyst after the roasting treatment is purged with nitrogen for 0.5h, and the gas space velocity of nitrogen is 500h -1 ;

[0063] (3) Introduce hydrogen as a reducing gas, and the gas space velocity is 800h -1 , a reduction reaction occurs, the reduction temperature is 1000° C., and the reduction time is 1 h to obtain a regenerated catalyst.

[0064] Fresh Ni / Al that did not participate in the reaction 2 o 3 Catalyst, Ni / Al deactivated after reaction 2 o 3 Catalyst and the regenerated Ni / Al that this embodiment obtains 2 o 3 The catalyst was tested by a transmission electron microscope with an acce...

Embodiment 2

[0068] The invention provides a kind of regeneration method of transition metal deactivated catalyst, described method comprises the following steps:

[0069] (1) Ni / Al that will be deactivated 2 o 3 The catalyst is calcined in the air, the gas space velocity is 2000h -1 , the calcination temperature is 1000°C, and the calcination time is 12h;

[0070] (2) The catalyst after the roasting treatment is purged with nitrogen for 0.5h, and the gas space velocity of nitrogen is 500h -1 ;

[0071] (3) Feed hydrogen and nitrogen mixed gas as reducing gas, wherein the volume percentage of hydrogen is 20%, and the gas space velocity is 1000h -1 , a reduction reaction occurs, the reduction temperature is 900° C., and the reduction time is 2 hours to obtain a regenerated catalyst.

[0072] The regenerated Ni / Al that this embodiment obtains 2 o 3 The catalyst was tested by a transmission electron microscope with an accelerating voltage of 200kV, and its TEM image is shown in Figur...

Embodiment 3

[0075] The present embodiment provides a kind of regeneration method of transition metal deactivated catalyst, described method comprises the following steps:

[0076] (1) Ni / Al that will be deactivated 2 o 3 The catalyst is calcined in a mixed gas of oxygen and nitrogen, wherein the volume percentage of oxygen is 50%, and the gas space velocity is 500h -1 , the calcination temperature is 600°C, and the calcination time is 15h;

[0077] (2) The catalyst after the roasting treatment is purged with nitrogen for 0.1h, and the gas space velocity of nitrogen is 1500h -1 ;

[0078] (3) Introduce hydrogen as a reducing gas, and the gas space velocity is 300h -1 , a reduction reaction occurs, the reduction temperature is 700° C., and the reduction time is 5 hours to obtain a regenerated catalyst.

[0079] The regenerated Ni / Al that this embodiment obtains 2 o 3 The catalyst was used in the methanation reaction under the same reaction conditions as in Example 1, and its catalyti...

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Abstract

The invention provides a regeneration method for a deactivated transition metal catalyst. The method includes the steps of (1) roasting the deactivated catalyst in an oxygen-containing gas; (2) carrying out purging with a protective gas to replace the oxygen-containing gas; (3) introducing a reducing gas for a reduction reaction to obtain a regenerated catalyst. By adopting the high-temperature solid-phase reaction and controlled reduction strategies, carbon deposition can be eliminated to realize regeneration of the catalyst deactivated by carbon deposition, and meanwhile agglomerated metal nanoparticles can be dispersed again to realize regeneration of the catalyst deactivated by metal sintering. The method is easy and convenient to implement and high in regeneration efficiency, the catalyst can be repeatedly regenerated, the carbon deposition and sintering resistance of the regenerated catalyst is improved, and the service life of the regenerated catalyst is prolonged.

Description

technical field [0001] The invention belongs to the field of catalyst regeneration, and relates to a regeneration method for a transition metal deactivated catalyst, in particular to a regeneration method for a transition metal catalyst deactivated due to carbon deposition and / or sintering of metal particles. Background technique [0002] Catalyst deactivation is a problem faced by almost all industrial catalysts during use. At present, transition metal supported catalysts are widely used in important industries such as F-T synthesis, reforming, methanation and hydrogenation because of their high activity, low cost and easy availability. There are two main reasons for the deactivation of such catalysts in industrial applications. One is carbon deposition deactivation, which causes the catalyst pores to be blocked and the pressure drop of the catalyst bed to increase due to the accumulation of carbon; the other is metal particle sintering deactivation, which manifests as The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/94B01J23/755B01J38/02B01J38/10C07C1/04C07C9/04
CPCB01J23/755B01J23/94B01J38/02B01J38/10C07C1/0435C07C1/045C07C9/04Y02P20/584
Inventor 苏发兵古芳娜谭强强
Owner LANGFANG INST OF PROCESS ENG CAS
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