Catalyst For A Naphtha Reforming Process

Abstract

The present disclosure relates to a catalyst for a naphtha reforming process. The catalyst comprises a chloride free zeolite coated alumina support impregnated with 0.01 wt % to 0.5 wt % active metal and 0.01 wt % to 0.5 wt % promoter metal, characterized in that the thickness of the zeolite coating on the alumina support ranges from 100 m to 200 m.

Claims

1. A catalyst comprising a chloride free zeolite coated alumina support impregnated with 0.01 wt % to 0.5 wt % active metal and 0.01 wt % to 0.5 wt % promoter metal, wherein the thickness of said zeolite coating on said chloride free alumina support ranges from 100 m to 200 m.

2. The catalyst as claimed in claim 1, wherein said zeolite is at least one selected from a group consisting of ZSM-5, mordenite, USY, H-Beta, MCM-22, and ZSM-12.

3. The catalyst as claimed in claim 1, wherein said zeolite is ZSM-5 comprising SiO.sub.2 and Al.sub.2O.sub.3.

4. The catalyst as claimed in claim 3, wherein said zeolite is ZSM-5 having the ratio of SiO.sub.2 to Al.sub.2O.sub.3 ranging from 10:1 to 20:1, preferably 15:1.

5. The catalyst as claimed in claim 1, wherein said active metal is at least one selected from the group consisting of platinum (Pt), palladium (Pd) and nickel (Ni).

6. The catalyst as claimed in claim 1, wherein said active metal is platinum (Pt).

7. The catalyst as claimed in claim 1, wherein said promoter metal is at least one selected from the group consisting of tin (Sn), rhenium (Re) and Iridium (Ir).

8. The catalyst as claimed in claim 1, wherein said promoter metal is tin (Sn).

Description

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0027] The disclosure will now be described with reference to the accompanying non-limiting drawings:

[0028] FIG. 1 illustrates the SEM micrograph of a catalyst in accordance with the present disclosure; wherein the catalyst depicts the thickness of the zeolite coating of size 135 microns.

DETAILED DESCRIPTION

[0029] The present disclosure provides a catalyst for a naphtha reforming process. The catalyst of the present disclosure is used for reforming of naphtha.

[0030] In a first aspect, the present disclosure provides a catalyst that comprises of a chloride free zeolite coated alumina support impregnated with 0.01 wt % to 0.5 wt % active metal and 0.01 wt % to 0.5 wt % promoter metal. The thickness of the zeolite coating on the chloride free alumina support ranges from 100 m to 200 m.

[0031] The zeolite is at least one selected from a group consisting of ZSM-5, mordenite, USY, H-Beta, MCM-22, and ZSM-12.

[0032] In accordance with one embodiment, the zeolite is ZSM-5 comprising SiO.sub.2 and Al.sub.2O.sub.3.

[0033] In accordance with one embodiment, the ratio of SiO.sub.2 to Al.sub.2O.sub.3 in ZSM-5 ranges from 10:1 to 20:1.

[0034] In accordance with another embodiment, the ratio of SiO.sub.2 to Al.sub.2O.sub.3 in ZSM-5 is 15:1.

[0035] Examples of the active metals impregnated in the catalyst include platinum (Pt), palladium (Pd) and nickel (Ni).

[0036] In accordance with one embodiment, the active metal impregnated in the catalyst is platinum (Pt).

[0037] In accordance with another embodiment, the concentration of the platinum (Pt) ranges from 0.01 wt % to 0.75 wt %.

[0038] Examples of the promoter metals impregnated in the catalyst include tin (Sn), rhenium (Re) and Iridium (Ir).

[0039] In accordance with one embodiment, the metal impregnated in the catalyst is tin (Sn).

[0040] In accordance with another embodiment, the concentration of the tin (Sn) ranges from 0.01 wt % to 0.75 wt %.

[0041] The alumina support of the conventional catalyst contains chloride which makes the catalyst highly acidic. Due to this, undesired C.sub.1 to C.sub.4 gaseous products are formed by cracking reaction during the reforming process.

[0042] The catalyst of the present disclosure comprises a chloride free alumina support coated with the zeolite and impregnated with 0.01 wt % to 0.5 wt % active metal and 0.01 wt % to 0.5 wt % promoter metal, which provides optimum acidity to the catalyst resulting into lower cracking during the reforming process. This leads in the reduction in formation and accumulation of coke on the catalyst surface, and sintering of metals on the catalyst surface during the reforming process. Due to this, the selectivity and the yield of desired hydrocarbons including desired aromatic compounds are improved.

[0043] The present disclosure is further illustrated herein below with the help of the following examples. The examples used herein are intended merely to facilitate an understanding of the ways in which the embodiments herein may be practiced and to further enable those of skilled in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

[0044] The catalyst of the present disclosure comprises a chloride free zeolite coated alumina support impregnated with 0.01 wt % to 0.5 wt % active metal and 0.01 wt % to 0.5 wt % promoter metal. The thickness of the zeolite coating on the chloride free alumina support is illustrated in the following example:

EXAMPLE

[0045] FIG. 1 illustrates the SEM micrograph of a catalyst in accordance with the present disclosure; wherein the catalyst depicts the thickness of the zeolite coating of size 135 microns.

[0046] The catalyst of the present disclosure described herein above shows that it overcomes the problems faced by the conventional catalyst.

Technical Advancement

[0047] The present disclosure relates to the catalyst. The catalyst has several technical advancements: [0048] the alumina support of the catalyst does not contain chloride; [0049] the catalyst has optimum acidity due to presence of chlorine free zeolite layer on the catalyst surface which results into less chain cracking and reduced coke formation during the reforming process. [0050] the selectivity of desired hydrocarbons is improved; and [0051] the yield of desired aromatic compounds is improved.

[0052] Throughout this specification the word comprise, or variations such as comprises or comprising, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

[0053] The use of the expression at least or at least one suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the invention to achieve one or more of the desired objects or results. While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Variations or modifications to the formulation of this invention, within the scope of the invention, may occur to those skilled in the art upon reviewing the disclosure herein. Such variations or modifications are well within the spirit of this invention.

[0054] The numerical values given for various physical parameters, dimensions and quantities are only approximate values and it is envisaged that the values higher than the numerical value assigned to the physical parameters, dimensions and quantities fall within the scope of the invention unless there is a statement in the specification to the contrary.