System, apparatus, and methods are disclosed for treating a reduction catalyst that has been exposed to an amount of sulfur. The treating of the reduction catalyst includes providing a fluid stream at a position upstream of the reduction catalyst. The fluid stream includes a temperature and a reductant amount, and the reductant amount includes an amount of urea, ammonia, or hydrocarbons.

The present invention relates to the use, in a method for in-situ activation of at least one hydrotreating, in particular hydrocracking, catalyst, of at least one nitrogen compound having at least one of the following characteristics: a) a nitrogen content by weight in the range from 15 to 35 wt %, relative to the total weight of the nitrogen compound; b) a number of nitrogen atoms in the range from 2 to 20; c) a boiling point in the range from 140 C. to 300 C.; and d) said nitrogen compound being in liquid form at room temperature and atmospheric pressure.

The present invention also relates to the method for in-situ activation of at least one hydrotreating catalyst comprising at least one step of sulphiding said hydrotreating catalyst in the presence of a sulphiding agent, and a step of passivation of said hydrotreating catalyst in the presence of said at least one nitrogen compound.

Method for the preparation of a metal exchanged crystalline microporous metalloaluminophosphate or mixtures containing metal exchanged microporous metalloaluminophosphates materials comprising the steps of providing a dry mixture containing a) one or more metalloaluminophosphates starting materials that exhibit ion exchange capacity, and b) one or more metal compounds; heating the mixture in a gaseous atmosphere containing ammonia to a temperature and for a time sufficient to initiate and perform a solid state ion exchange of ions of the metal compound and ions of the crystalline microporous material; and obtaining the metal-exchanged microporous metalloaluminophosphate material or mixtures containing the metal-exchanged microporous metalloaluminophosphate material.

Method for the preparation of a metal-exchanged zeolites or mixtures of metal-exchanged zeolites, such as Cu-SSZ-13, Cu-ZSM-S, Cu-beta, or Fe-beta, comprising the steps of providing a dry mixture of a) one or more microporous zeotype materials that exhibit ion exchange capacity and b) one or more metal compounds; heating the mixture in a gaseous atmosphere containing ammonia to a temperature lower than 300 C. for a time sufficient to initiate and perform a solid state ion exchange of ions of the metal compound and ions of the zeolite material; and obtaining the metal-exchanged zeolitematerial.

Disclosed is a method for preparing diamino-dicyclohexyl methane (H.sub.12MDA) by hydrogenation of diamino-diphenyl methane (MDA). In the process, 4,4-MDA used as the starting material is firstly hydrogenated to prepare 4,4-H.sub.12MDA. When the activity of the catalyst is reduced, the feed is switched from 4,4-MDA to the mixture of 2,4-MDA and 4,4-MDA, and then when the conversion is stabilized, the feed is switched to 4,4-MDA again. The deactivated catalyst is activated on line by switching the feed to the mixture of 2,4-MDA and 4,4-MDA. 4,4-H.sub.12MDA having the trans-trans isomer content of 1624 wt % is produced, and the mixture of 2,4-H.sub.12MDA and 4,4-H.sub.12MDA is also produced, wherein the content of 2,4-H.sub.12MDA in the mixture is 415 wt %.

Disclosed is a method for preparing diamino-dicyclohexyl methane (H.sub.12MDA) by hydrogenation of diamino-diphenyl methane (MDA). In the process, 4,4-MDA used as the starting material is firstly hydrogenated to prepare 4,4-H.sub.12MDA. When the activity of the catalyst is reduced, the feed is switched from 4,4-MDA to the mixture of 2,4-MDA and 4,4-MDA, and then when the conversion is stabilized, the feed is switched to 4,4-MDA again. The deactivated catalyst is activated on line by switching the feed to the mixture of 2,4-MDA and 4,4-MDA. 4,4-H.sub.12MDA having the trans-trans isomer content of 1624 wt % is produced, and the mixture of 2,4-H.sub.12MDA and 4,4-H.sub.12MDA is also produced, wherein the content of 2,4-H.sub.12MDA in the mixture is 415 wt %.

The present invention relates to a method for preparing, activating and regenerating a metal supported catalyst, comprising: treating a M.sub.a-M.sub.b-M.sub.c metal supported catalyst at 10-700 C. by using an ammonia or nitrogen-containing organic matter, wherein the M.sub.a metal is an active metal selected from one or more of a noble metal atom or a transition metal, the support is a common industrial porous catalyst, and the M.sub.a metal is dispersed on the support in a state of single atomic site. According to the M.sub.a-M.sub.b-M.sub.c metal supported noble metal/zinc catalyst treated by the method of the present invention, the direct dehydrogenation conversion rate and selectivity of catalyzing light alkanes are remarkably improved; the method for preparing the catalyst is simple in process, the catalytic activity after regeneration is still kept, and the catalyst can be industrially produced on a large scale.

The present invention relates to a method for preparing, activating and regenerating a metal supported catalyst, comprising: treating a M.sub.a-M.sub.b-M.sub.c metal supported catalyst at 10-700 C. by using an ammonia or nitrogen-containing organic matter, wherein the M.sub.a metal is an active metal selected from one or more of a noble metal atom or a transition metal, the support is a common industrial porous catalyst, and the M.sub.a metal is dispersed on the support in a state of single atomic site. According to the M.sub.a-M.sub.b-M.sub.c metal supported noble metal/zinc catalyst treated by the method of the present invention, the direct dehydrogenation conversion rate and selectivity of catalyzing light alkanes are remarkably improved; the method for preparing the catalyst is simple in process, the catalytic activity after regeneration is still kept, and the catalyst can be industrially produced on a large scale.

A regeneration method of a nitrogen-containing carbon catalyst includes the following steps: roasting the nitrogen-containing carbon catalyst in a nitrogen-containing atmosphere to obtain a regenerated nitrogen-containing carbon catalyst. The method is a universal method, which is suitable for nitrogen-doped carbon catalysts and can be used to regenerate a nitrogen-containing carbon catalyst for producing vinyl chloride (VC) through 1,2-dichloroethane cracking. The method can greatly reduce the production cost of the catalyst and increase the service life of the catalyst, and a regeneration process thereof is fast, simple, and controllable, and does not require high temperatures.

A regeneration method of a nitrogen-containing carbon catalyst includes the following steps: roasting the nitrogen-containing carbon catalyst in a nitrogen-containing atmosphere to obtain a regenerated nitrogen-containing carbon catalyst. The method is a universal method, which is suitable for nitrogen-doped carbon catalysts and can be used to regenerate a nitrogen-containing carbon catalyst for producing vinyl chloride (VC) through 1,2-dichloroethane cracking. The method can greatly reduce the production cost of the catalyst and increase the service life of the catalyst, and a regeneration process thereof is fast, simple, and controllable, and does not require high temperatures.