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Catalyst for C10+ heavy arene hydrodealkylation and preparation method thereof

A technology for hydrodealkylation and heavy aromatics, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as poor processing capacity of heavy aromatics, reduce production costs, and promote transfer. , the effect of improving utilization

Inactive Publication Date: 2019-08-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is in order to solve existing catalyst to C 10 + The problem of poor processing capacity of heavy aromatics with higher content provides a method for C 10 + A catalyst for preparing mixed xylenes by hydrodealkylation of heavy aromatics, another object of the present invention is to provide a preparation method for the above-mentioned catalyst

Method used

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  • Catalyst for C10+ heavy arene hydrodealkylation and preparation method thereof
  • Catalyst for C10+ heavy arene hydrodealkylation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Put 1.5g of β molecular sieve in 30g of 0.1mol / L hydrochloric acid solution, heat up to 60°C, stir and reflux for 2h, wash with deionized water and centrifuge until the pH is 6.6, dry at 100°C for 6h, and 400°C under air atmosphere ℃ calcination for 3 hours to obtain a modified β molecular sieve carrier with micropore-mesoporous composite structure (the specific surface area and pore volume are respectively 291.2m 2 / g and 0.30cm 3 / g).

[0030] (2) 0.12g of Ni(NO 3 )2 ·6H 2 O and 0.05g of Co(NO 3 ) 2 ·6H 2 O and 0.01g of La(NO 3 ) 3 ·6H 2 O was dissolved in 20 mL of deionized water, and a highly dispersed solution was obtained after stirring for 2 h.

[0031] (3) The molecular sieve obtained in step (1) was immersed in the precursor mixed solution obtained in step (2) for 12 hours, dried at 100° C. for 6 hours, and calcined at 400° C. for 3 hours in an air atmosphere to obtain the finished catalyst 1 . (NiO content is 2% in the catalyst, Co 3 o 4 Conten...

Embodiment 2

[0033] (1) Put 1.5g of β molecular sieve in 40g of 0.5mol / L acetic acid solution, heat up to 70°C, stir and reflux for 3h, wash with deionized water and centrifuge until the pH is 6.9, dry at 110°C for 7h, and 450°C under air atmosphere ℃ calcination for 3.5h to obtain a modified β molecular sieve carrier with a microporous-mesoporous composite structure (the specific surface area and pore volume are respectively 295.8m 2 / g and 0.32cm 3 / g).

[0034] (2) 0.24g of Ni(NO 3 ) 2 ·6H 2 O and 0.04g of (NH 4 ) 6 Mo 7 o 24 4H 2 O and 0.03g of Ce(NO 3 ) 3 ·6H 2 O was dissolved in 20 mL of deionized water, and a highly dispersed solution was obtained after stirring for 2.5 h.

[0035] (3) The molecular sieve obtained in step (1) was immersed in the precursor mixed solution obtained in step (2) for 14 hours, dried at 110°C for 8 hours, and calcined at 450°C for 3.5 hours in an air atmosphere to obtain the finished catalyst 2. (NiO content is 4% in the catalyst, MoO 3 Conte...

Embodiment 3

[0037] (1) Place 1.5g of β molecular sieve in 50g of 1.0mol / L mixed solution of nitric acid and hydrochloric acid, heat up to 85°C, stir and reflux for 3.5h, wash and centrifuge with deionized water until the pH is 7.0, and dry at 120°C for 12h. Calcined at 500°C for 4 hours in an air atmosphere to obtain a modified β molecular sieve carrier with a microporous-mesoporous composite structure (the specific surface area and pore volume are 298.0m 2 / g and 0.35cm 3 / g).

[0038] (2) 0.48g of Ni(NO 3 ) 2 ·6H 2 O and 0.08g of (NH 4 ) 6 Mo 7 o 24 4H 2 O and 0.03g of Ce(NO 3 ) 3 ·6H 2 O was dissolved in 20 mL of deionized water, and a highly dispersed solution was obtained after stirring for 3 h.

[0039] (3) The molecular sieve obtained in step (1) was immersed in the precursor mixed solution obtained in step (2) for 16 hours, dried at 120° C. for 10 hours, and calcined at 500° C. for 4 hours in an air atmosphere to obtain the finished catalyst 3 . (NiO content in the ca...

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Abstract

The invention provides a catalyst for C10+ heavy arene hydrodealkylation and a preparation method thereof. The catalyst adopts a modified beta molecular sieve with a micropore-mesoporous composite structure as a carrier, and transition metal oxide and rare earth oxides as active components, wherein the transition metal oxide is a mixture of one or more of MoO3, Bi2O3, Co3O4 or CuO and NiO; the rare earth oxide is one or two of La2O3 or CeO2; the content of NiO is 2-16% of the mass of the carrier; the content of one or more of MoO3, Bi2O3, Co3O4 or CuO is 1-5% of the mass of the carrier; the content of the rare earth oxide is 0.4-2% of the mass of the carrier. The catalyst provided by the invention adopts the micropore-mesoporous composite structure, has stronger processing capacity to C10+heavy arene (equal to or greater than 40wt%), and can improve the C10+ heavy arene conversion rate and the mixed xylene selectivity.

Description

technical field [0001] The present invention relates to a kind of heavy aromatic hydrocarbon catalyst and preparation method thereof, be specifically related to a kind of catalyst for C 10 + A catalyst for hydrodealkylation of heavy aromatics and a preparation method thereof. Background technique [0002] Heavy aromatics are aromatic compounds with carbon atoms ≥ 9 (C 9 ) in general, especially C 10 and C 10 The above aromatic compounds (hereinafter referred to as C 10 + ). The main sources are pyrolysis gasoline and ethylene tar by-products of catalytic reforming units and ethylene units of refineries, and coal tar by-products of high-temperature coal coking. [0003] At present, there are mainly two methods for the comprehensive utilization of heavy aromatics. One is to directly physically separate and utilize heavy aromatics, which generally uses rectification to extract trimethylbenzene, homo Products such as tetramethylbenzene, naphthalene, methylnaphthalene, an...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J29/78B01J35/10C07C15/08C07C4/18
CPCB01J29/7615B01J29/7815C07C4/18B01J35/615B01J35/633C07C15/08Y02P20/52
Inventor 管国锋赵远王磊万辉
Owner NANJING UNIV OF TECH
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