Catalyst used for hydrogenation ring opening reaction of polycyclic aromatic hydrocarbon, and preparation method and application thereof

A hydrogenation ring-opening and condensed-ring aromatics technology, which is applied in the direction of molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as increasing the cetane number without consideration

Inactive Publication Date: 2014-10-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

US5183556 discloses a method for producing low-aromatic diesel oil using two reaction zones. The main

Method used

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  • Catalyst used for hydrogenation ring opening reaction of polycyclic aromatic hydrocarbon, and preparation method and application thereof
  • Catalyst used for hydrogenation ring opening reaction of polycyclic aromatic hydrocarbon, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 100 g of Beta zeolite molecular sieve raw powder with a silicon-aluminum ratio of 30 and put it into a three-necked flask, then add 1000 ml of 0.4 mol / L ammonium nitrate, and exchange at 80° C. for 2 hours. After the exchange, it is dried, and then placed in a muffle furnace for calcination at 550° C. for 4 hours to obtain an acidic H-Beta zeolite molecular sieve.

[0029] Weigh 10g of acidic H-Beta molecular sieve and 3g of alumina to form it, dry it after forming, and then bake at 500°C for 4h. Using the equal-volume impregnation method, chloroplatinic acid was spray-impregnated on the calcined shaped catalyst carrier, and the Pt loading was 0.5wt%. The metal-supported molecular sieve catalyst was calcined at 500° C. for 5 hours. The calcined catalyst was reduced in a hydrogen atmosphere at a reduction temperature of 500°C for 4 hours, and the obtained catalyst was ready for use.

Embodiment 2

[0031] Preparation of acidic H-Beta zeolite molecular sieve modified by nitric acid. Weigh 30 g of the acidic H-Beta zeolite molecular sieve prepared in Example 1 and put it into a three-necked flask, then add 200 ml of 1.0 mol / L nitric acid, and exchange at 80° C. for two hours. After the exchange, it was dried, and then placed in a muffle furnace for calcination at 550° C. for 4 hours to obtain a nitric acid-modified H-Beta zeolite molecular sieve.

Embodiment 3

[0033] Citric acid modified acidic H-Beta zeolite molecular sieve. Weigh 20 g of the acidic H-Beta zeolite molecular sieve prepared in Example 1 and put it into a three-necked flask, then add 200 ml of 1.5 mol / L citric acid, and exchange at 80° C. for two hours. After the exchange, it was dried, and then put into a muffle furnace for calcination at 500° C. for 4 hours to obtain a citric acid-modified H-Beta zeolite molecular sieve.

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Abstract

The invention relates to a catalyst used for hydrogenation ring opening of polycyclic aromatic hydrocarbon and advanced hydrogenation dearomatization and isomeric pour point depression of diesel oil, and a preparation method thereof. The catalyst is formed by using modified H-Beta molecular sieve with a high silica-alumina ratio and an inorganic oxide as a carrier, and precious metal Pt, Pd or Ir as an active component. The catalyst has a high metal dispersion ability, and has suitable acid kind, acid strength and pore structure. The catalyst can inhibit advanced cracking, and promotes the selective ring opening of aromatic hydrocarbon and product isomerization. The catalyst is suitable for advanced hydrogenation saturation of diesel oil with low sulfur and nitrogen content, selective ring opening and isomerization, can reduce the aromatic hydrocarbon content in the diesel oil, can improve the cetane number of oil products, and can reduce the condensation point of the diesel oil.

Description

technical field [0001] The invention relates to a hydrogenation ring-opening catalyst for condensed-ring aromatic hydrocarbons, deep hydrogenation dearomatization of diesel oil and isomerization pour point depressing catalyst and a preparation method thereof. Background technique [0002] National III standards for diesel oil require that the mass fraction of polycyclic aromatic hydrocarbons be less than 11%, and the cetane number be higher than 49. However, in most areas such as northern my country, the temperature is low in winter, and the demand for low-condensation diesel is very strong. Therefore, it is of great significance to develop clean diesel production technology with both high cetane number and low freezing point. The main sources of diesel in my country are catalytic cracking diesel and coker diesel, which have high aromatic content and low cetane number. At present, two methods are generally used in the industry to reduce the aromatics content of diesel oil:...

Claims

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Application Information

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IPC IPC(8): B01J29/74C10G49/08
Inventor 徐仁顺田志坚马怀军曲炜李鹏王炳春
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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