Regeneration method of metal catalyst

Abstract

The invention relates to a regeneration method of a metal catalyst, and belongs to the technical field of regeneration of deactivated catalyst. The regeneration method comprises the following steps: evenly mixing a deactivated catalyst with a nitrogen-containing compound, which can be degraded into nitrogen-containing gas at a high temperature; then placing the obtained mixture into a tubular furnace, and burning the mixture at a high temperature under the protection of inert gas so as to obtain the regenerated metal catalyst. The used nitrogen-containing compound can be degraded into nitrogen-containing gas at a high temperature, the nitrogen-containing gas can interact with metal particles so as to disperse metal particles and reduce the particle size of metal particles, thus the surface utilization rate of metal is improved; the used nitrogen-containing compound is degraded into gas at a high temperature, no other impurity is introduced; furthermore, the operation is simple, the method can be easily applied to the industrial production; and the method can effectively regenerate deactivated catalyst to obtain regenerated catalyst with recovered activity.

Description

technical field [0001] The invention relates to the technical field of deactivated catalyst regeneration, in particular to a metal catalyst regeneration method. Background technique [0002] The activity and selectivity of the catalyst will gradually decrease during the use process, and even the use value of the catalyst will be lost. This is the deactivation process of the catalyst. Catalyst deactivation is a complex physical and chemical process, and deactivation is usually divided into three types: catalyst deactivation such as carbon deposition, catalyst poisoning deactivation, catalyst thermal deactivation and sintering deactivation. Catalyst regeneration refers to an operation means and method in which the activity and selectivity of the catalyst drop to a certain extent after use, and the activity and selectivity of the catalyst can be recovered through appropriate treatment. It is to prolong the service life of the catalyst and reduce the production cost. an importa...

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Problems solved by technology

The regeneration method adopted in the early stage is to use solvent (such as acetone, cyclohexane and other organic solvents) extraction method (such as Ind.Eng.Chem.Res.1998,37,882-886, etc.), and use the method of oxidizing acid to wash the catalyst to remove the catalyst Surface deposits (such as Environ.Sci.Technol.2006, 40, 2030-2036, etc.), due to the unsatisfactory effect of extraction and pickling methods, researchers use reducing gas high-temperature reduction method and oxidizing gas high-temperature oxidation method (such as Appl.Catal.B, Environ.1997, 13, 265-274; CN201180047091, etc.)

However, these treatment methods can only change the catalyst surface deposits, and do not change the problems such as sintering of catalyst particles.

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