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Hydrodealkylation catalyst and preparation method thereof

A hydrodealkylation and catalyst technology, applied in the direction of catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of little research on transition metal sulfides, and achieve high dealkylation activity and BTX selection performance, improving accessibility, and shortening the diffusion distance

Pending Publication Date: 2021-07-27
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above research work, precious metals, non-noble metals and their oxides are used as the active components in the catalysts to perform hydrogenation and hydrogenolysis functions, and there are few studies on transition metal sulfides as active components.

Method used

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  • Hydrodealkylation catalyst and preparation method thereof
  • Hydrodealkylation catalyst and preparation method thereof
  • Hydrodealkylation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Alkali treatment: put HZSM-5 in 0.2mol / L NaOH aqueous solution at a liquid-solid ratio of 30mL / g, and stir at 65°C for 1h. Filter, wash until neutral, and dry at 120°C for 4 hours to obtain an alkali-treated sample. Ammonium exchange: put the alkali-treated sample in a 1mol / L ammonium chloride solution at a solid-to-liquid ratio of 10ml / g, stir at 70°C for 4h, filter and wash the product, dry at 120°C for 4h, and roast at 550°C for 4h. Repeat the ammonium exchange step once to obtain micro-mesoporous ZSM-5, press the micro-mesoporous ZMS-5 into tablets, and sieve to obtain 20-40 mesh particles, which are used as catalyst carrier AKZ-1.

[0027] Contains 1.4g MoO in 16mL 3 The ammonium molybdate solution was used as the impregnating solution, and 20g of AKZ-1 was impregnated, left at room temperature for 24 hours, dried at 120°C for 4 hours, and calcined at 550°C for 4 hours to obtain Mo / AKZ-1.

[0028] The above Mo / AKZ-1 was impregnated with 16 mL of nickel acetate so...

Embodiment 2

[0030] The preparation method is the same as that of Example 1, except that the alkali treatment time is 2 hours during the alkali treatment. The obtained micro-mesoporous ZSM-5 carrier is marked as AKZ-2, and the catalyst is marked as NiMoAKZ-2. The catalyst contains AKZ-2 92wt%, MoO 3 6.5wt%, NiO 1.5wt%.

Embodiment 3

[0032] The preparation method is the same as that of Example 1, except that the alkali treatment time is 3 hours during the alkali treatment. The obtained micro-mesoporous ZSM-5 carrier is marked as AKZ-3, and the catalyst is marked as NiMoAKZ-3. The catalyst contains AKZ-3 92wt%, MoO 3 6.5wt%, NiO 1.5wt%.

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Abstract

The invention discloses a micro-mesoporous ZSM-5 supported NiMo hydrodealkylation catalyst and a preparation method of the micro-mesoporous ZSM-5 supported NiMo hydrodealkylation catalyst. The method comprises the following steps: putting HZSM-5 into alkali liquor according to a liquid-solid ratio of 20-40 mL / g, treating at 50-80 DEG C for 0.5-4 hours, cooling, washing, filtering and drying to obtain an alkali treatment sample; putting the alkali treated sample into an ammonium solution according to a solid-to-liquid ratio of 5-15 mL / g, treating at 50-90 DEG C for 2-6 hours, cooling, washing, filtering, drying and roasting to obtain primary ammonium exchange ZSM-5; carrying out ammonium exchange, cooling, washing, filtering, drying and roasting on the obtained ZSM-5 to obtain the micro-mesoporous ZSM-5; tabletting and screening the micro-mesoporous ZSM-5 to obtain the micro-mesoporous ZSM-5 carrier, and loading a metal active component on the micro-mesoporous ZSM-5 carrier, and drying and roasting to obtain the target catalyst. The micro-mesoporous ZSM-5 supported NiMo catalyst provided by the invention shows relatively high activity and benzene, toluene and xylene (BTX) selectivity in a hydrogenation dealkylation reaction of a heavy aromatic model compound trimethylbenzene.

Description

technical field [0001] The invention relates to a catalyst for hydrodealkylation of heavy aromatics and a preparation method thereof. Background technique [0002] With the construction and capacity expansion of reforming and ethylene units, the output of heavy aromatics is increasing. The mixture of light aromatic hydrocarbons benzene, toluene, and xylene is the basic raw material for the production of rubber, fiber, polyester, detergent, medicine, etc., and is in huge demand. Therefore, the preparation of BTX from heavy aromatics through catalytic hydrodealkylation has become the focus of research. Xiao Huan et al. (Xiao Huan, Zhang Weimin, Ma Jinghong, Li Ruifeng, Acta Petroleum Sinica (Petroleum Processing), 35(2019) 369-375) studied the effect of five zeolite catalysts on 1,3,5-trimethylbenzene (1,3,5- TMB) conversion performance, the results show that the pore structure of zeolite is the main factor affecting its dealkylation performance, the disproportionation react...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01J37/30B01J37/02B01J37/08C10G45/64
CPCB01J29/48B01J37/30B01J37/0201B01J37/082C10G45/64B01J2229/186C10G2400/30
Inventor 单书峰周如金吴世逵陈菲菲曾兴业李凝林存辉王丽谢颖李德培刘旭彬李锦梅
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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