In-reactor activation of a high chloride aromatization catalyst
Processes for activating a high-chlorine content aromatization catalyst in a reactor system include the steps of contacting the aromatization catalyst with an inert gas stream in the reactor system at a drying temperature of 300-400° C. to form a treated catalyst, and then contacting the treated catalyst with a reducing gas stream in the reactor system to form an activated catalyst. Subsequently, a hydrocarbon feed can be contacted with the activated catalyst under reforming conditions in the reactor system to produce an aromatic product.
1 . A reforming process comprising:
(i) contacting a supported aromatization catalyst with an inert gas stream in a reactor system at a drying temperature in a range from 300° C. to 400° C. to form a treated catalyst, the supported aromatization catalyst comprising;
a bound zeolite base;
from 0.3 wt. % to 3 wt. % of platinum;
from 1.8 wt. % to 4 wt. % of chlorine; and
from 0.4 wt. % to 1.5 wt. % of fluorine;
(ii) contacting the treated catalyst with a reducing gas stream in the reactor system to form an activated catalyst; and
(iii) contacting a hydrocarbon feed with the activated catalyst under reforming conditions in the reactor system to produce an aromatic product.
2 . The process of claim 1 , wherein the process further comprises a step of cooling the treated catalyst after step (i) and before step (ii) to a temperature in a range from 150° C. to 280° C.
3 . The process of claim 2 , wherein the step of cooling the treated catalyst is performed in an inert gas.
4 . The process of claim 2 , wherein the step of cooling the treated catalyst is performed in a mixture of an inert gas and a reducing gas.
5 . The process of claim 1 , wherein:
the bound zeolite base comprises a silica-bound K/L-zeolite; and
the supported aromatization catalyst comprises:
from 0.5 wt. % to 2.5 wt. % of platinum;
from 2.2 wt. % to 3.6 wt. % of chlorine; and
from 0.5 wt. % to 1.3 wt. % of fluorine.
6 . The process of claim 1 , wherein the hydrocarbon feed comprises C 6 -C 8 alkanes and/or cycloalkanes.
7 . The process of claim 1 , wherein:
the inert gas stream comprises nitrogen; and
the drying temperature is in a range from 315° C. to 385° C.
8 . The process of claim 1 , wherein:
the reducing gas stream comprises molecular hydrogen; and
step (ii) is conducted at a peak reducing temperature in a range from 200° C. to 600° C.
9 . The process of claim 1 , wherein the treated catalyst comprises:
from 0.30 wt. % to 2.3 wt. % chlorine; and
from 0.05 wt. % to 0.7 wt. % nitrogen.
10 . The process of claim 1 , wherein:
the activated catalyst is characterized by a T EOR less than that of an otherwise identical catalyst in which step (i) is performed at a temperature of less than 275° C., under the same aromatization reaction conditions; and
the activated catalyst is characterized by a T SOR less than that of an otherwise identical catalyst in which step (i) is performed at a temperature of less than 275° C., under the same aromatization reaction conditions.
11 . The process of claim 1 , wherein the hydrocarbon feed contains less than or equal to 750 ppm of sulfur, based on the weight of the hydrocarbon feed.