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A kind of supported catalyst and its preparation method, the method for catalytic synthesis of n-ethylaniline

A supported catalyst and catalyst technology, applied in the field of catalysis, can solve problems such as low selectivity of N-ethylaniline, and achieve the effects of high selectivity, improved selectivity and improved catalytic efficiency

Active Publication Date: 2021-05-28
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

However, the selectivity of N-ethylaniline obtained by the above synthetic route is low, being about 70% to 90%.

Method used

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  • A kind of supported catalyst and its preparation method, the method for catalytic synthesis of n-ethylaniline
  • A kind of supported catalyst and its preparation method, the method for catalytic synthesis of n-ethylaniline
  • A kind of supported catalyst and its preparation method, the method for catalytic synthesis of n-ethylaniline

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preparation example Construction

[0033] The present invention also provides a preparation method of the supported catalyst described in the above technical scheme, comprising the following steps:

[0034] Soluble Cu salt, organic solvent and Al 2 o 3 After mixing, dry to obtain solid product;

[0035] After mixing the solid product, tetraethyl silicate and ethanol, mixing with an alkaline pH regulator, and adjusting the pH value, a catalyst precursor is obtained;

[0036] The catalyst precursor is calcined to obtain the supported catalyst.

[0037] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in this field.

[0038] The present invention combines soluble Cu salt, organic solvent and Al 2 o 3 After mixing, drying afforded a solid product.

[0039] In the present invention, the soluble Cu salt preferably includes one or more of copper nitrate, copper acetate and copper chloride. In the present invention, the organic solvent ...

Embodiment 1

[0059] Take by weighing 241mg copper nitrate trihydrate (1mmol), join in 128g acetone, after stirring and dissolving in the round bottom flask, weigh 128gAl 2 o 3 Add it into a round bottom flask, stir at 35°C for 12h until the acetone evaporates, then dry at 120°C for 3h to obtain a solid product;

[0060] Mix 1.6g tetraethyl silicate and 198mL ethanol to obtain a tetraethyl silicate ethanol solution with a mass concentration of 1.0wt%, add the obtained solid product to the tetraethyl silicate ethanol solution, and stir thoroughly Finally, add ammonia water dropwise, adjust to pH=7.5, make tetraethyl silicate hydrolyze completely, the drip rate of ammonia water is 1mL / min, in Cu(OH) 2 / Al 2 o 3 Surface precipitation forms SiO 2 Thin film, obtain catalyst precursor;

[0061] The obtained catalyst precursors were washed with water in turn until neutral, filtered, and the filter residue was dried at 120°C for 3 hours, then placed in a muffle furnace, heated from room temper...

Embodiment 2

[0065] Take by weighing 400mg copper acetate (2mmol), join in 128g acetone, after stirring and dissolving in the round bottom flask, weigh 128gAl 2 o 3 Add it into a round bottom flask, stir at 35°C for 8h until the acetone volatilizes, then dry at 120°C for 3h to obtain a solid product;

[0066] Mix 3.2g tetraethyl silicate and 196mL ethanol to obtain a tetraethyl silicate ethanol solution with a mass concentration of 2.0wt%, add the obtained solid product to the tetraethyl silicate ethanol solution, and stir thoroughly Finally, add ammonia water dropwise, adjust to pH=7.5, make tetraethyl silicate hydrolyze completely, the drip rate of ammonia water is 1mL / min, in Cu(OH) 2 / Al 2 o 3 Surface precipitation forms SiO 2 Thin film, obtain catalyst precursor;

[0067] The obtained catalyst precursors were washed with water in sequence to neutrality, filtered, and the filter residue was dried at 120°C for 3 hours, then placed in a muffle furnace, heated from room temperature t...

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Abstract

The invention provides a supported catalyst, a preparation method thereof, and a method for catalytically synthesizing N-ethylaniline, which relate to the technical field of catalysis. The supported catalyst provided by the invention, with Cu / Al 2 o 3 As the core, with SiO 2 For the shell, the Cu / Al 2 o 3 including Al 2 o 3 and loaded at the Al 2 o 3 Cu in the pores and on the surface. In the present invention, SiO 2 For the shell not only can strengthen Cu / Al 2 o 3 In the process of catalyzing the synthesis of N-ethylaniline, it can also limit the further collision between the target product N-ethylaniline and unreacted ethanol on the active site of Cu to generate N,N-di The rate of ethylaniline, thereby improving the selectivity of N-ethylaniline.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a supported catalyst, a preparation method thereof, and a method for catalytically synthesizing N-ethylaniline. Background technique [0002] N-Ethylaniline is a yellow-brown transparent oily liquid with aniline smell and a boiling point of 204°C. It is insoluble in water but soluble in most organic solvents; it is mainly used as a dye for various dyes, such as azo dyes and triphenylmethane dyes. Intermediates can also be used as raw materials for pesticides, medicines, rubber additives, and photosensitive materials. In recent years, many companies have used them as antiknock agents and antioxidants in the gasoline industry. It is a very important chemical product. . [0003] In the prior art, there are mainly four routes for the synthesis of N-ethylaniline: the reductive amination method of aniline and acetaldehyde, the reaction method of aniline and haloethane, the liquid ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72B01J35/10B01J37/08C07C209/18C07C211/48
CPCB01J23/002B01J23/72B01J35/0086B01J35/10B01J37/088C07C209/18C07C211/48
Inventor 袁航空黄永吉石峰赵祥涛陈旭亮
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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