Reforming catalyst and a method of preparation thereof

Patent metadata

Field	Value
Publication number	US-10596551-B2
Application number	US-201515507679-A
Country	US
Kind code	B2
Filing date	Aug 26, 2015
Priority date	Aug 29, 2014
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

The present disclosure relates to a reforming catalyst composition comprising a spherical gamma AI2O3 support; at least one Group VB metal oxide sheet coated on to the AI2O3 support; and at least one active metal and at least one promoter metal impregnated on the AI2O3 coated support. The reforming catalyst composition of the present disclosure has improved activity, better selectivity for total aromatics during naphtha reforming and results in less coke formation. The reforming catalyst composition has improved catalyst performance with simultaneous modification of acidic sites as well as metallic sites through metal support interaction. The acid site cracking activity of the catalyst is inhibited because of the use of chloride free alumina support modified with solid acid such as Group VB metal oxide and impregnated with active metals. The present disclosure provides a process for naphtha reforming in the presence of the reforming catalyst composition of the present disclosure to obtain reformates of naphtha.

First claim

The invention claimed is:

1. A reforming catalyst composition comprising:
a. a spherical gamma Al 2 O 3 support;
wherein the spherical gamma Al 2 O 3 support is a chloride free spherical gamma Al 2 O 3 support;
b. at least one Group VB metal oxide sheet coated on to said Al 2 O 3 support;
wherein:
the Group VB metal is at least one selected from a group consisting of niobium (Nb) and tantalum (Ta) having a concentration in the range of 0.01 to 0.5 wt % of the catalyst composition;
the metal oxide sheet coating has a thickness in the range of 100 to 250 μm; and
c. at least one active metal and at least one promoter metal impregnated on said Al 2 O 3 coated support.

2. The catalyst composition as claimed in claim 1 , wherein said active metal is at least one Group VIII metal selected from the group consisting of Platinum (Pt) and Palladium (Pd) having a concentration in the range of 0.01 to 0.5 wt % of the catalyst composition.

3. The catalyst composition as claimed in claim 1 , wherein said promoter metal is at least one Group IVA, VIIB and VIIIB metal selected from a group consisting of Tin (Sn) and Germanium (Ge) having a concentration in the range of 0.01 to 0.5 wt % of the catalyst composition.

4. A method for preparing the reforming catalyst composition as claimed in claimed 1 , said process comprising the following steps:
a. dissolving at least one Group VB metal chloride in a predetermined amount of alcohol and aqueous ammonia in a flask to obtain a Group VB metal oxide gel;
b. adding a predetermined amount of Al 2 O 3 to said flask containing the Group VB metal oxide gel to obtain a first mixture;
c. hydrothermally treating said first mixture at a predetermined temperature for a predetermined time period to obtain a second mixture comprising modified Al 2 O 3 coated with Group VB metal oxide sheet;
d. filtering said second mixture comprising modified Al 2 O 3 to obtain a first residue and a first filtrate;
e. drying said first residue at a temperature in the range of 100° C. to 150° C. for a time period in the range of 10 hours to 15 hours and calcining said first residue at a temperature in the range of 530° C. to 560° C. for a time period in the range of 4 to 8 hours to obtain a calcined modified Al 2 O 3 ;
f. dissolving a predetermined amount of at least one active metal salt selected from Group VIII metal salt and a predetermined amount of at least one promoter metal salt selected from Group IVA in water, in a second flask to obtain a third mixture;
g. adding a predetermined amount of concentrated HCl to said third mixture to obtain a dark red colored fourth mixture;
h. introducing a predetermined amount of calcined modified Al 2 O 3 to said fourth mixture and stirring it for a time period in the range of 8 to 16 hours at a temperature in the range of 25° C. to 35° C., followed by removing water under reduced pressure to obtain a second residue; and
i. drying and calcining said second residue to obtain the reforming catalyst composition.

5. The method as claimed in claim 4 , wherein said predetermined temperature is in the range of 160° C. to 200° C. and said predetermined time period is in the range of 40 hours to 50 hours.

6. The method as claimed in claim 4 , wherein the concentration of said active metal and promoter metal ranges from 0.01 to 0.5 wt % of the catalyst composition.

7. A process for naphtha reforming comprising the following steps:
a. charging a fixed bed reactor with the reforming catalyst composition of claim 1 under inert atmosphere;
b. introducing H 2 in said reactor till a pressure of 7.3 kg/cm 2 is achieved;
c. heating the catalyst composition at a temperature in the range of 440 to 540° C.; and
d. contacting naphtha having LHSV of 1.95 hour −1 with said heated catalyst composition to obtain reformates of naphtha.

Assignees

• Reliance Industries Ltd

Inventors

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

Classifications

• B01J21/04 Primary

  Alumina · CPC title

• B01J23/6484

  Niobium · CPC title

• B01J37/10

  in the presence of water, e.g. steam · CPC title

• B01J27/13

  Platinum group metals · CPC title

• B01J37/24

  Chlorinating · CPC title