Catalyst for efficiently synthesizing p-xylene through shape-selective aromatization of low-carbon hydrocarbon

A technology for p-xylene and a catalyst is applied in the field of catalysts for the efficient synthesis of p-xylene by shape-selective aromatization of low-carbon hydrocarbons, which can solve the problems of low xylene selectivity and achieve the effects of high selectivity and yield

Inactive Publication Date: 2020-01-17
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of low-carbon hydrocarbon shape-selective aromatization high-efficiency synthesis of p-xylene catalyst and its application method, to solve the p-xylene selectivity in the existing low-carbon hydrocarbon aromatization catalytic reaction proposed in the background technology low sex problem

Method used

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  • Catalyst for efficiently synthesizing p-xylene through shape-selective aromatization of low-carbon hydrocarbon

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1) Take 10g of flaky crystals with a thickness of 90nm and a nano-flaky HZSM-11 molecular sieve with a silicon-aluminum atomic molar ratio of 7 and mix them with 10g of alumina binder. After stirring evenly, add an appropriate amount of dilute nitric acid to knead and extrude. After drying at room temperature, it was calcined at 500° C. for 1 hour to obtain a strip-shaped catalyst with a cross-sectional diameter of 1.5 mm. Then the unmodified catalyst particle of above-mentioned gained molding is excessively impregnated 12 hours in the gallium nitrate aqueous solution of certain concentration, and the loading capacity of gallium trioxide is determined to be 2g by the water absorption of unmodified catalyst and solution concentration, the sample after impregnating is at 120 After drying at 500°C for 6 hours, it was baked at 500°C for 1 hour. Finally, a nanosheet-shaped HZSM-11 molecular sieve catalyst modified with 10 wt% gallium trioxide was prepared.

[0022] 2) Put 5...

Embodiment 2

[0024] 1) Weigh 19g of nano-acicular HZSM-11 molecular sieve with a silicon-aluminum atomic molar ratio of 500 and acicular crystal cut-off surface diameter of 30nm, mix it with 1g of silica binder, roll into a ball, and dry it at room temperature. Calcined at 500°C for 1 hour to obtain spherical catalyst particles with a diameter of 1.5 mm. Then the above-mentioned unmodified catalyst formed by molding is successively immersed in a certain concentration of calcium nitrate aqueous solution, lanthanum nitrate aqueous solution and ammonium dihydrogen phosphate aqueous solution for 12 hours in excess, and the water absorption and solution concentration of the unmodified catalyst are determined. Calcium oxide, The loads of lanthanum oxide and phosphorus pentoxide were 1.0g, 1.0g and 4.0g respectively, and the impregnated samples were dried at 120°C for 6 hours and then calcined at 500°C for 1 hour. Finally, a nanoacicular HZSM-11 molecular sieve catalyst compositely modified with ...

Embodiment 3

[0027]1) Weigh 8g of nano-flaky HZSM-11 molecular sieves with a silicon-aluminum atomic molar ratio of 2 and a flaky crystal thickness of 350nm, and 8g of nano-needle-shaped molecular sieves with a silicon-aluminum atomic molar ratio of 40 and acicular crystal cut-off diameter of 450nm. HZSM-11 molecular sieves were mixed, and then 4g of silica binder was added, kneaded, extruded, dried at room temperature, and calcined at 500°C for 1 hour to obtain strip-shaped catalyst particles with a cross-sectional diameter of 1.5mm. Then the unmodified catalyst particle of above-mentioned gained molding is excessively impregnated 12 hours in the zinc nitrate aqueous solution of certain concentration, and the loading capacity of zinc oxide is determined to be 0.04g by the water absorption of unmodified catalyst and solution concentration, the sample after impregnating is at 120 After drying at 500°C for 6 hours, it was baked at 500°C for 1 hour. Finally, a 0.2wt% ZnO-modified hybrid molec...

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Abstract

The invention relates to a catalyst for efficiently synthesizing p-xylene through shape-selective aromatization of low-carbon hydrocarbon, wherein the catalyst comprises 50-95 wt% of a special-morphology short-pore HZSM-11 molecular sieve, 5-50 wt% of a binder and a modifying aid, and the content of the modifying aid is 0.1-30 wt% of the total weight of the molecular sieve and the binder. According to the invention, the catalyst is prepared on the basis of molding of a short-pore HZSM-11 molecular sieve with a special morphology and modifying of at least an oxide auxiliary agent, and is used in a reaction for producing p-xylene through low-carbon hydrocarbon aromatization; and compared with the catalyst in the prior art, the catalyst provided by the invention is a short-pore-channel shape-selective catalyst, especially has high aromatization efficiency, can effectively inhibit the generation of byproducts such as benzene, toluene, o / m-xylene, C9+ aromatic hydrocarbons and the like, andshows extremely high p-xylene selectivity and high yield.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for efficiently synthesizing p-xylene through shape-selective aromatization of low-carbon hydrocarbons and an application method thereof. Background technique [0002] Paraxylene (PX) is one of the most demanded basic aromatic raw materials today. It can be oxidized to obtain terephthalic acid, which can be further synthesized into important polymer materials polyester fibers and plastics. In addition, it is also widely used in the fields of medicine, pesticides, dyes and solvents. In recent years, with the sustained and rapid development of the polyester industry and fine chemical industry, the demand for PX is growing rapidly year by year. According to statistics, the current annual demand for PX in my country is more than 20 million tons, and about 12 million tons need to be imported. Its main commercial production methods are toluene disproportionat...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/46B01J29/48C07C2/84C07C15/08
CPCB01J29/405B01J29/46B01J29/48B01J2229/186C07C2/84C07C2529/40C07C2529/46C07C2529/48C07C15/08Y02P20/52
Inventor 李军辉龚清宋剑红方婷谢阳利
Owner XIANGTAN UNIV
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