Reforming catalyst and a process for preparation thereof

Patent metadata

Field	Value
Publication number	US-10751703-B2
Application number	US-201615740904-A
Country	US
Kind code	B2
Filing date	Jun 30, 2016
Priority date	Jun 30, 2015
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

The present disclosure relates to a reforming catalyst and a process for preparing the same. The acidic functionality of the catalyst is suppressed by using a chloride free alumina and coating the chloride free alumina with Group V B metal oxide in the catalyst, which helps in minimizing the cracking reactions and achieving higher selectivity for liquid hydrocarbons and aromatic hydrocarbons.

First claim

The invention claimed is:

1. A reforming catalyst comprising
i) a chloride-free alumina support; and
ii) a coating on said support,
wherein said coating comprising at least one Group V B metal oxide in an amount in the range of 0.01 wt % to 0.5 wt %, at least one Group VII B metal in an amount in the range of 0.01 wt % to 0.5 wt % and at least one Group VIII B metal in an amount in the range of 0.01 wt % to 0.5 wt %.

2. The catalyst as claimed in claim 1 , wherein said at least one Group V B metal oxide is selected from the group consisting of niobium (V) oxide and tantalum (V) oxide.

3. The catalyst as claimed in claim 1 , wherein said at least one Group VII B metal is rhenium (Re).

4. The catalyst as claimed in claim 1 , wherein said at least one Group VIII B metal is selected from the group consisting of platinum (Pt) and palladium (Pd).

5. A process for preparing the reforming catalyst as claimed in claim 1 , said process comprising the following steps:
a) charging a vessel with a predetermined amount of a Group V B metal salt and an aqueous base while stirring to obtain a Group V B metal oxide gel;
b) introducing a predetermined amount of chloride-free alumina in said metal oxide gel to obtain a first mixture;
c) heating said first mixture at a temperature in the range of 100 to 300° C. for a time period in the range of 20 to 100 hours to obtain a heated first mixture comprising a coated alumina support;
d) separating said coated alumina support from said heated first mixture followed by drying and calcining to obtain a calcined coated alumina support; and
e) impregnating the coating of said calcined coated alumina support with a Group VII B metal and a Group VIII B metal to obtain the reforming catalyst.

6. The process as claimed in claim 5 , wherein said at least one Group V B metal oxide is selected from the group consisting of niobium (V) oxide and tantalum (V) oxide; said at least one Group VII B metal is rhenium (Re); and said at least one Group VIII B metal is selected from the group consisting of platinum (Pt) and palladium (Pd).

7. The process as claimed in claim 5 , wherein said at least one Group V B metal oxide, said at least one Group VII B metal and said at least one Group VIII B metal are each in an amount in the range of 0.01 wt % to 0.5 wt % of the reforming catalyst.

8. The process as claimed in claim 5 , wherein said impregnation step (e) comprises the following sub-steps:
i. providing an aqueous solution of at least one Group VII B metal salt and an aqueous solution of at least one Group VIII B metal salt;
ii. mixing a predetermined amount of said aqueous solution of Group VII B metal salt, a predetermined amount of said aqueous solution of Group VIII B metal salt and a predetermined amount of concentrated HCl to form a second mixture;
iii. immersing at least a portion of said calcined coated alumina support in said second mixture while stirring to form a first dispersion comprising a first supernatant liquid and a first residue; and
iv. removing said first supernatant liquid from said dispersion followed by drying said first residue at a temperature in the range of 100 to 140° C. and calcining to obtain the reforming catalyst.

9. The process as claimed in claim 8 , wherein said at least one Group VII B metal salt is HReO 4 and said at least one Group VIII B metal salt is H 2 PtCl 6 .(H 2 O) 6 .

10. The process as claimed in claim 8 , wherein the ratio of the amount of the calcined coated alumina support and the amount of said second mixture is 1:5.

11. The process as claimed in claim 8 , wherein said calcination step (iv) is carried out at a temperature in the range of 500° C. to 600° C. for a time period in the range of 4 to 15 hours.

12. The process as claimed in claim 5 , wherein said calcination step (d) is carried out at a temperature in the range of 500° C. to 600° C. for a time period in the range of 4 to 15 hours.

13. A process for preparing the reforming catalyst as claimed in claim 1 , said process comprising the following steps:
i. charging a reactor with a predetermined amount of Group V B metal oxide, a predetermined amount of an aqueous solution of Group VII B metal salt, a predetermined amount of an aqueous solution of Group VIII B metal salt and at least one fluid medium to obtain a mixture;
ii. introducing a predetermined amount of chloride-free alumina in said mixture under stirring to obtain a slurry;
iii. terminating the stirring to obtain a dispersion comprising a supernatant liquid and a residue; and
iv. removing said supernatant liquid from said dispersion followed by drying said residue at a temperature in the range of 100 to 140° C. and calcining at a temperature in the range of 500° C. to 600° C. for a time period in the range of 4 to 15 hours to obtain the reforming catalyst.

14. The process as claimed in claim 13 , wherein said at least one fluid medium is selected from the group consisting of water, ethyl alcohol, n-butyl amine, and tetrabutylammonium hydroxide.

15. The process as claimed in claim 13 , wherein said at least one Group V B metal oxide is selected from the group consisting of niobium (V) oxide and tantalum (V) oxide; said at least one Group VII B metal salt is HReO 4 and said at least one Group VIII B metal salt is H 2 PtCl 6 .(H 2 O) 6 .

16. The process as claimed in claim 13 , wherein said at least one Group V B metal oxide, said at least one Group VII B metal and said at least one Group VIII B metal are each in an amount in the range of 0.01 wt % to 0.5 wt % of the reforming catalyst.

Assignees

• Reliance Industries Ltd

Inventors

• Sharma Nagesh
• Katravulapalli Veera Venkata Satya Bhaskara Sita Rama Murthy
• Kumar Ajay
• Gopalakrishnan Kalpana
• Jasra Raksh Vir

Classifications

• B01J37/20

  Sulfiding · CPC title

• B01J37/0244

  Coatings comprising several layers · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J21/04

  Alumina · CPC title

• B01J23/6567 Primary

  Rhenium · CPC title