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A kind of anti-zn loss aromatization catalyst and preparation method and application thereof

An aromatization and composite catalyst technology, which can be used in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., and can solve the problems of reducing reaction stability, Zn sublimation loss, and high reaction temperature.

Active Publication Date: 2022-07-29
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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  • A kind of anti-zn loss aromatization catalyst and preparation method and application thereof
  • A kind of anti-zn loss aromatization catalyst and preparation method and application thereof
  • A kind of anti-zn loss aromatization catalyst and 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] The zinc source, the gallium source, the complexing agent and the water are mixed, the pH value of the obtained mixed solution is adjusted to 1-14, and heated 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 successively dried and calcined to obtain ZnGa 2 O 4 .

[0034] In the present invention, the zinc source, the gallium source, the complexing agent and the water are mixed, the pH value of the obtained mixed solution is adjusted to 1-14, and heated 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 of gallium sulfate, galli...

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, 6mol of citric acid is dissolved in water and then added dropwise to the obtained metal salt solution, 30% ammonia water is added to adjust the pH=3 of the obtained mixed solution, and the water Evaporate to dryness to obtain a wet gel, which is dried at 120 °C overnight, and then calcined at 900 °C for 8 hours to obtain ZnGa 2 O 4 ;

[0054] 0.2g ZnGa 2 O 4 Put 1.8g HZSM-5 in a beaker, add 2mL deionized water to form a paste, stir for 30min, suction filtration, dry overnight, calcinate at 560°C for 8h to obtain a composite catalyst, denoted 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, 6 mol of citric acid is dissolved in water, and the obtained metal salt solution is added dropwise, and 30% ammonia water is added to adjust the pH=1 of the obtained mixed solution. Evaporate to dryness to obtain a wet gel, which is dried at 120°C overnight, and then calcined at 350°C for 24 hours to obtain ZnGa 2 O 4 ;

[0057] 0.002g ZnGa 2 O 4 and 1.998g HZSM-5 were placed in a beaker, 2mL of deionized water was added to form a paste, stirred for 30min, suction filtered, dried overnight, and calcined at 560°C for 2h to obtain a composite catalyst, denoted as 0.1% ZnGa 2 O 4 / HZSM-5.

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Abstract

The invention provides an aromatization composite catalyst with resistance to Zn loss, a preparation method and application thereof, and belongs to the technical field of aromatization catalysts. In the present invention, ZnGa 2 O 4 It forms an aromatization composite catalyst with HZSM‑5, and Zn is stabilized in the catalyst and is not easily affected by H 2 High temperature reduction sublimation loss, and ZnGa 2 O 4 Spinel increases surface defect sites, making Zn and Ga more favorable to synergize with HZSM-5, enhancing dehydrogenation ability, inhibiting H transfer path, favoring dehydrogenation to form aromatics, improving the selectivity of aromatics, enhancing the Stability and longevity of catalysts.

Description

technical field [0001] The invention relates to the technical field of aromatization catalysts, in particular to an aromatization catalyst with resistance to Zn loss, and a preparation method and application thereof. Background technique [0002] Aromatic hydrocarbons mainly include benzene, toluene and xylene (BTX), etc., which are an important part of gasoline. As important chemical raw materials, they are widely used in the fields of energy, transportation, materials, medicine and daily chemicals. With the shortage of petroleum resources, it is urgent to develop non-petroleum routes to produce aromatics. Currently, aromatization of light hydrocarbons is considered to be an ideal conversion route. Aromatization of light hydrocarbons is a process in which C2-C6 alkanes or olefins are converted into aromatic hydrocarbons through complex reactions such as cracking, dehydrogenation, oligomerization, hydrogen transfer, cyclization and isomerization under the action of a cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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