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US 2023/0249166 A1Published application
Catalyst for Producing C8 Aromatic Hydrocarbon Having Reduced Ethylbenzene Content and Preparation Method Therefor
AssigneeSK Innovation Co., Ltd.
InventorsSang Il Lee, Ji Hoon Lee, Young Eun Cheon, Yeon Ho Kim
Life of this patent
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Abstract
Disclosed are a catalyst and a preparation method therefor, the catalyst being able to maintain a high production yield of C8 aromatic hydrocarbons in the process of converting a feedstock containing alkyl aromatics to C8 aromatic hydrocarbons such as mixed xylene through disproportionation/transalkylation/dealkylation while reducing a content of ethylbenzene in the products.
Claims18
A catalyst, comprising:
- (A) a mixed support comprising (i) an MFI-type first zeolite having a silica-alumina ratio (SAR) of 10 to 200 and containing a reduced form of palladium (Pd) inside the pores thereof, and (ii) a second zeolite having a silica-alumina ratio of 10 to 200 and a pore size of 6 to 9 Å;
- and
- (B) at least one first metal supported onto the mixed support and selected from the group consisting of platinum (Pt), rhenium (Re), and molybdenum (Mo);
- wherein the first metal is used in an amount of 0.01 to 5% by weight, based on the total weight of the catalyst.
1 more element
A method for preparing a catalyst, comprising the steps of:
- a) subjecting an MFI-type first zeolite having a silica-alumina ratio (SAR) of 10 to 200 to ion exchange with a palladium (Pd) precursor to form an MFI-type first zeolite containing palladium (Pd) in the pores thereof;
- b) forming a mixed support comprising:
- the palladium-containing MFI-type first zeolite;
- and a second zeolite having a silica-alumina ratio (SAR) of 10 to 200 and a pore size of 6 to 9 Å;
- c) introducing to the mixed support at least one first metal selected from the group consisting of platinum (Pt), rhenium (Re) and molybdenum (Mo);
- and
- d) reducing the mixed support to afford a reduced form of palladium, followed by additionally reducing or sulfiding the first metal to form a reduced form of palladium and a reduced form of the first metal, or a reduced form of palladium and a sulfide form of the first metal in the mixed support;
- wherein, the first metal is used in an amount of 0.01 to 5% by weight, based on the total weight of the catalyst.
5 more elements
A method for preparing a catalyst, comprising the steps of:
- a1) subjecting an MFI-type first zeolite having a silica-alumina ratio (SAR) of 10 to 200 to ion exchange with a palladium (Pd) precursor to form an MFI-type first zeolite containing palladium (Pd) in the pores thereof;
- b1) introducing at least one first metal selected from the group consisting of platinum (Pt), rhenium (Re), and molybdenum (Mo) to a second zeolite having a silica-alumina ratio (SAR) of 10 to 200 and a pore size of 6 to 9 Å to form a first metal-containing second zeolite;
- c1) combining the palladium (Pd)-containing MFI-type first zeolite and the first metal-containing second zeolite to form a metal-containing mixed support;
- and
- d1) reducing the metal-containing mixed support to give a reduced form of palladium, followed by further reducing or sulfiding the first metal to form a reduced form of palladium and a reduced form of the first metal, or a reduced form of palladium and a sulfide form of the first metal in the mixed support;
- wherein, the first metal is used in an amount of 0.01 to 5% by weight, based on the total weight of the catalyst.
3 more elements
A method for preparing a catalyst, comprising the steps of:
- a2) subjecting an MFI-type first zeolite having a silica-alumina ratio (SAR) of 10 to 200 to ion exchange with a palladium (Pd) precursor to form an MFI-type first zeolite containing palladium (Pd) in the pores thereof;
- b2) providing a second zeolite having a silica-alumina ratio (SAR) of 10 to 200 and a pore size of 6 to 9 Å;
- c2) combining the palladium (Pd)-containing MFI-type first zeolite, the second zeolite, and at least one first metal selected from the group consisting of platinum (Pt), rhenium (Re), and molybdenum (Mo) to form a metal-containing mixed support;
- and
- d2) reducing the metal-containing mixed support to form a reduced form of palladium, followed by further reducing or sulfiding the first metal to form a reduced form of palladium and a reduced form of the first metal, or a reduced form of palladium and a sulfide form of the first metal in the mixed support;
- wherein, the first metal is used in an amount of 0.01 to 5% by weight, based on the total weight of the catalyst.
3 more elements
Dependencies are inferred from the claim text.