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Metal organic framework compound catalyst as well as preparation method and application thereof

A technology of metal-organic frameworks and compounds, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, catalytic reactions, etc. Effect

Active Publication Date: 2021-12-28
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is still a great challenge to develop new highly dispersed and effective selective aromatization catalysts to improve the selectivity of p-xylene

Method used

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  • Metal organic framework compound catalyst as well as preparation method and application thereof
  • Metal organic framework compound catalyst as well as preparation method and application thereof
  • Metal organic framework compound catalyst as well as preparation method and application thereof

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Embodiment 1

[0060] In order to realize the above-mentioned technical purpose, the invention provides a kind of Cr based on metal organic framework compound, Fe, the preparation method of Al ternary homogeneous catalyst, this preparation method comprises the following steps:

[0061] Disperse a certain molar ratio of aluminum salt, chromium salt, iron salt and organic ligand in a solvent to form a mixed solution; wherein, the molar ratio of aluminum salt to chromium salt is 1:0.02, or 1:0.1, or 1:0.15 , or a certain ratio within the interval, the molar ratio range of aluminum salt to iron salt is 1:0.005, or 1:0.01, or 1:0.04, or 1:0.08, or a certain ratio within the interval, the total metal ions and The ratio range of the organic ligand is 1:3, or 1:1, or 3:1, or a certain ratio within the range. The molar ratio of the aluminum salt to the solvent is 0.0001:1, or 0.0002:1, or 0.0005:1, or 0.001:1, or a certain ratio within the range. The aluminum salt includes one or more combinations o...

Embodiment 2

[0072] This embodiment provides a method for preparing a metal-organic framework compound catalyst, which includes the following steps:

[0073] Preparation of metal organic framework compound catalyst:

[0074] The schematic diagram of the synthesis of metal-organic framework compound catalysts is shown in figure 1 As shown, first, the three metal sources and organic ligands are dispersed in a solvent to form a mixed solution, which is then transferred to a reaction kettle for crystallization, and finally the metal-organic framework compound catalyst is obtained by roasting. details as follows:

[0075] Disperse 8mmol aluminum nitrate nonahydrate, 0.4mmol chromium nitrate nonahydrate, 0.24mmol iron nitrate nonahydrate and 4mmol terephthalic acid in 50mL deionized water to form a mixed solution; stir evenly at room temperature and transfer to a 100mL reaction kettle for 180 ℃ crystallization for 24 hours, solid-liquid separation after cooling to obtain MOF (Al, Cr, Fe); in a...

Embodiment 3

[0082] The present embodiment provides the preparation method of the metal-organic framework compound derived CAT (Al, Cr) catalyst, which comprises the following steps:

[0083] Disperse 8mmol aluminum nitrate nonahydrate, 0.4mmol chromium nitrate nonahydrate and 4mmol terephthalic acid in 50mL deionized water to form a mixed solution; stir evenly at room temperature and transfer to a 100mL reactor for crystallization at 180°C for 24h, after cooling MOF (Al, Cr) was obtained by solid-liquid separation; in a static air atmosphere, the temperature of MOF (Al, Cr) was raised to 450 °C at a rate of 3 °C / min and kept at a constant temperature for 3 h to obtain CAT (Al , Cr) catalyst. Tested by the nitrogen physical low-temperature adsorption method, the catalyst has a double pore structure, the micropore size is 0.3-0.5nm, the mesopore size is 4-50nm, and the specific surface area calculated by the BET method is 180m 2 / g. The loading amount of chromium in the catalyst is 5% by ...

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Abstract

The invention discloses a metal organic framework compound catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: crystallizing a mixed reaction system containing an aluminum salt, a chromium salt, an iron salt, an organic ligand and a solvent at 150-220 DEG C for 4-36 hours to prepare a metal organic framework compound; and carrying out heat treatment on the metal organic framework compound at 400-600 DEG C for 1-12 hours to prepare the metal organic framework compound catalyst. The metal organic framework compound catalyst prepared by the invention can be used for selective aromatization of hydrocarbons, and shows relatively high catalytic activity and stability.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous catalysis, and in particular relates to a metal-organic framework compound catalyst and its preparation method and application, in particular to a preparation method of a metal-organic framework compound catalyst using aluminum salt, chromium salt and iron salt as metal sources And applications, for example in the selective preparation of p-xylene from diisobutene. Background technique [0002] As an important organic chemical raw material, p-xylene is the most valuable chemical in aromatic hydrocarbons. It is usually oxidized to terephthalic acid and then condensed with ethylene glycol to form polyethylene terephthalate (PET ), that is, polyester, which is widely used in many aspects such as electronic devices, packaging bags, plastics and synthetic fibers. In addition, p-xylene can also be used as a solvent to produce medicines, spices, etc. [0003] At present, the sources of p-xylene i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J35/10C07C5/41C07C15/08C08G83/00
CPCB01J31/1691C07C5/41C07C15/08C08G83/008B01J2531/842B01J2531/62B01J2531/31B01J2531/0213B01J2231/52B01J2231/766B01J35/643B01J35/615B01J35/647Y02P20/52
Inventor 朱刚利曾德红夏春谷
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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