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Anti-Zn loss aromatization catalyst as well as preparation method and application thereof

A technology of aromatization and composite catalysts, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as shortened catalyst life, high reaction temperature, and reduced reaction stability

Active Publication Date: 2021-12-31
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during the aromatization reaction of light hydrocarbons, the reaction temperature is high, and ethylene and hydrogen are used as the reducing atmosphere. life

Method used

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  • Anti-Zn loss aromatization catalyst as well as preparation method and application thereof
  • Anti-Zn loss aromatization catalyst as well as preparation method and application thereof
  • Anti-Zn loss aromatization catalyst as well as preparation method and application thereof

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preparation example Construction

[0031] In the present invention, the ZnGa 2 o 4 The preparation method preferably comprises the following steps:

[0032] Mix the zinc source, the gallium source, the complexing agent and water, adjust the pH value of the resulting mixed solution to 1-14, and heat to obtain a wet gel; the molar ratio of the zinc element in the zinc source to the gallium element in the gallium source is 10:1~1:10;

[0033] The wet gel is dried and calcined in sequence to obtain ZnGa 2 o 4 .

[0034] The invention mixes the zinc source, the gallium source, the complexing agent and water, adjusts the pH value of the obtained mixed solution to 1-14, and heats to obtain the wet gel. In the present invention, the zinc source preferably includes one or more of zinc nitrate, zinc acetate, zinc sulfate, zinc hydroxide, zinc chloride, zinc oxide and zinc sulfide; the gallium source preferably includes gallium nitrate, One or more in gallium sulfate, gallium hydroxide, gallium chloride, gallium oxi...

Embodiment 1

[0053] 1mol Zn(NO 3 ) 2 ·6H 2 O, 2molGa(NO 3 ) 3 ·6H 2 O is dissolved in water to form a metal salt solution. After dissolving 6 mol of citric acid in water, add dropwise to the gained metal salt solution, add ammonia water with a mass concentration of 30% to adjust the pH of the resulting mixed solution to 3, and dissolve the water in a water bath at 90°C. Evaporate to dryness to obtain a wet gel, dry the wet gel overnight at 120°C, and then bake at 900°C for 8h to obtain ZnGa 2 o 4 ;

[0054] 0.2g ZnGa 2 o 4 Put 1.8g of HZSM-5 in a beaker, add 2mL of deionized water to form a paste, stir for 30min, filter with suction, dry overnight, and roast at 560°C for 8h to obtain a composite catalyst, which is recorded as 10% ZnGa 2 o 4 / HZSM-5.

Embodiment 2

[0056] 1mol Zn(NO 3 ) 2 ·6H 2 O, 2molGa(NO 3 ) 3 ·6H 2 O is dissolved in water to form a metal salt solution, and 6mol citric acid is dissolved in water and then added dropwise to the resulting metal salt solution, adding ammonia water with a mass concentration of 30% to adjust the pH of the resulting mixed solution to 1, and the water is mixed under 90°C in a water bath Evaporate to dryness to obtain a wet gel, dry the wet gel overnight at 120°C, and then bake at 350°C for 24h to obtain ZnGa 2 o 4 ;

[0057] 0.002g ZnGa 2 o 4 Put 1.998g of HZSM-5 in a beaker, add 2mL of deionized water to form a paste, stir for 30min, filter with suction, dry overnight, and roast at 560°C for 2h to obtain a composite catalyst, which is recorded as 0.1% ZnGa 2 o 4 / HZSM-5.

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Abstract

The invention provides a anti-Zn loss aromatization catalyst as well as a preparation method and an application thereof, and belongs to the technical field of aromatization catalysts. In the method, ZnGa2O4 and HZSM-5 form an aromatization composite catalyst, Zn is stabilized in the catalyst and is not easy to be reduced, sublimated and lost by H2 at a high temperature, and ZnGa2O4 spinel increases surface defect sites, so that Zn and Ga are more beneficial to synergism with HZSM-5; therefore, the catalyst enhances the dehydrogenation capacity, inhibits an H transfer path, facilitates dehydrogenation to form aromatic hydrocarbon, and improves the selectivity of the aromatic hydrocarbon, and furthermore, the stability and the service life of the catalyst are improved.

Description

technical field [0001] The invention relates to the technical field of aromatization catalysts, in particular to a Zn loss-resistant aromatization catalyst and its preparation method and application. Background technique [0002] Aromatics mainly include benzene, toluene and xylene (BTX), which are important components of gasoline and are widely used as important chemical raw materials in the fields of energy, transportation, materials, medicine and daily chemicals. With the shortage of petroleum resources, there is an urgent need to develop non-petroleum routes to aromatics. Currently, the aromatization of light hydrocarbons is considered to be an ideal conversion path. Aromatization of light hydrocarbons is a process in which C2-C6 alkanes or olefins are converted into aromatics through complex reactions such as cracking, dehydrogenation, oligomerization, hydrogen transfer, cyclization, and isomerization under the action of a catalyst. Because HZSM-5 has a very unique th...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J23/08C07C2/76C07C15/02
CPCB01J23/005B01J23/08B01J29/405B01J29/40C07C2/76B01J2229/18C07C15/02
Inventor 董梅冯鹏程樊卫斌李柏超王建国焦卫勇吴志伟王森
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI