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Catalyst for preparing low carbon aromatic hydrocarbon by hydrodealkylation of C10+ heavyweight aromatic hydrocarbon and preparation method of catalyst

A technology for hydrodealkylation and low-carbon aromatics, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of poor processing capacity of heavy aromatics, reduce production costs, and improve utilization rate effect

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

[0005] 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 low-carbon aromatics 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 preparing low carbon aromatic hydrocarbon by hydrodealkylation of C10+ heavyweight aromatic hydrocarbon and preparation method of catalyst
  • Catalyst for preparing low carbon aromatic hydrocarbon by hydrodealkylation of C10+ heavyweight aromatic hydrocarbon and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mix 1.2 g of MOR molecular sieve and 0.3 g of β molecular sieve into a composite molecular sieve carrier, and stir for 5 minutes. (The content of MOR molecular sieve and β molecular sieve in the composite molecular sieve carrier is 80% and 20%, respectively; the specific surface area, pore volume and most probable pore size of the composite molecular sieve are 302.5 m, respectively 2 / g, 0.25cm 3 / g and 6.3nm)

[0029] (2) 0.06g of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and 0.03 g of Co(NO 3 ) 2 ·6H 2O and 0.03 g 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 0.5 h.

[0030] (3) The molecular sieve obtained in step (1) was immersed in the precursor mixed solution obtained in step (2) for 24 hours, dried at 110° C. for 8 hours, and calcined at 400° C. for 4 hours in an air atmosphere to obtain a finished catalyst 1. (MoO in the catalyst 3 The content is 3%, Co 3 O 4 Content is 0....

Embodiment 2

[0032] (1) Mix 0.9 g of MOR molecular sieve, 0.3 g of β molecular sieve and 0.3 g of ZSM-5 molecular sieve into a composite molecular sieve carrier, and stir for 6 minutes. (The content of MOR molecular sieve, β molecular sieve and ZSM-5 molecular sieve in the composite molecular sieve carrier is 60%, 20% and 20%, respectively; the specific surface area, pore volume and most probable pore size of the composite molecular sieve are 321.2 m 2 / g, 0.35cm 3 / g and 5.4nm)

[0033] (2) 0.12 g of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and 0.12 g of Ni (NO 3 ) 2 ·6H 2 O and 0.005g 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 1 h.

[0034] (3) The molecular sieve obtained in step (1) was immersed in the precursor mixed solution obtained in step (2) for 30 hours, dried at 120° C. for 10 hours, and calcined at 450° C. for 6 hours in an air atmosphere to obtain finished catalyst 2. (MoO in the catalyst ...

Embodiment 3

[0036] (1) Mix 0.9 g of MOR molecular sieve, 0.3 g of Y molecular sieve and 0.3 g of ZSM-5 molecular sieve into a composite molecular sieve carrier, and stir for 7 minutes. (The content of MOR molecular sieve, Y molecular sieve and ZSM-5 molecular sieve in the composite molecular sieve carrier is 60%, 20% and 20%, respectively; the specific surface area, pore volume and most probable pore size of the composite molecular sieve are 385.6 m 2 / g, 0.37cm 3 / g and 7.0nm)

[0037] (2) 0.18 g of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and 0.045g of Bi (NO 3 ) 3 ·5H 2 O and 0.015g 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 1.5 h.

[0038] (3) The molecular sieve obtained in step (1) was immersed in the precursor mixed solution obtained in step (2) for 36 hours, dried at 130° C. for 12 hours, and calcined at 500° C. for 6 hours in an air atmosphere to obtain finished catalyst 3. (MoO in the catalys...

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Abstract

The invention provides a catalyst for preparing low carbon aromatic hydrocarbon by hydrodealkylation of C10+ heavyweight aromatic hydrocarbon. The catalyst is characterized in that the catalyst takesa composite molecular sieve as a carrier and a transition metal oxide and a rare earth oxide as active components, wherein the transition metal oxide is MoO3, and one or more of NiO, Bi2O3, Co3O4 or CuO; the rare earth oxide is one or two of La2O3 and CeO2; a content of MoO3 is 3-12% of the mass of the carrier; a content of NiO, Bi2O3 or Co3O4 is 0.5-2% of the mass of the carrier; and a content ofthe rare earth oxide is 0.2-1% of the mass of the carrier. A method of preparing low carbon aromatic hydrocarbon by the hydrodealkylation of C10+ heavyweight aromatic hydrocarbon has stronger processing capacity of C10+ heavyweight aromatic hydrocarbon (greater than or equal to 40wt%); a conversion rate of C10+ heavyweight aromatic hydrocarbon can be increased; and selectivity of low carbon aromatic hydrocarbon can be improved.

Description

technical field [0001] The invention relates to a heavy aromatic hydrocarbon catalyst and a preparation method thereof, in particular to a C 10 + A catalyst for preparing low-carbon aromatics by hydrodealkylation of heavy aromatics and a preparation method thereof. Background technique [0002] Heavy aromatics are aromatic compounds with carbon number ≥ 9 (C 9 ) in general, especially C 10 and C 10 The above aromatic compounds (hereinafter referred to as C 10 + ). The characteristics of heavy aromatic hydrocarbons are complex composition, large proportion of polycyclic aromatic hydrocarbons, only C 10 Aromatic hydrocarbons have more than 100 components. Heavy aromatics mainly come from catalytic reforming units in refineries, wide-cut catalytic reforming units in polyester raw material plants, pyrolysis gasoline and ethylene tar by-products from ethylene units, and coal tar by-products from high-temperature coal coking. With the successive commissioning of millions ...

Claims

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Application Information

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IPC IPC(8): B01J29/78B01J35/10C10G47/20
CPCB01J29/005B01J29/7815C10G47/20C10G2300/1096C10G2400/30B01J35/60
Inventor 管国锋赵远王磊万辉
Owner NANJING UNIV OF TECH
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