Preparation method of catalyst for gas phase fluorination reaction

A gas-phase fluorination and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, halogen substitution preparation, etc., can solve the problems of difficulty in improving the activity, easy carbon deposition catalyst life, and production benefits that are not worth the gain, and achieve high response Active and selective effects

Inactive Publication Date: 2015-08-12
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The catalyst prepared by the above method has the following deficiencies: (1) the single-component chromium-based catalyst has a relatively high conversion rate for gas-phase fluorination, but it is difficult to improve the activity due to thermodynamic limitations, and it is easy to deposit carbon during the reaction process, which shortens the life of the catalyst. Not long, (2) Although the activity of the supported catalyst has been improved, there is a lack of innovation in the catalyst preparation process, and the addition of some precious metals increases the production cost, which is not worth the candle in terms of production efficiency

Method used

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Embodiment 1

[0022] ① According to the total mass ratio of SBA-15 template agent to chromium nitrate nonahydrate and sucrose is 1:4, the mass ratio of chromium nitrate nonahydrate and sucrose is 100:3. Weigh the SBA-15 template agent, chromium nitrate nonahydrate and sucrose respectively. Mix chromium nitrate nonahydrate, sucrose and deionized water evenly to prepare a solution, then add the mixed solution to SBA-15, stir at room temperature for 4 hours, and then heat in a water bath to remove water;

[0023] ②After drying in an oven at 100°C for 12 hours, then calcined at 600°C for 4 hours in a nitrogen atmosphere, and then calcined in an air atmosphere at 450°C for 4 hours, and the carbon was burned to obtain Cr filled 2 o 3 SBA-15;

[0024] ③According to La 2 o 3 The mass percentage is the filled Cr obtained in ② 2 o 3 0.1% of SBA-15, weighed La(NO 3 ) 3 ·6H 2 O, add distilled water, stir to dissolve, form a solution, add to the filled Cr obtained in ② 2 o 3 Immerse in SBA-15...

Embodiment 2

[0027] ① According to the total mass ratio of SBA-15 template agent to chromium nitrate nonahydrate and sucrose is 1:4, the mass ratio of chromium nitrate nonahydrate and sucrose is 100:5. Weigh the SBA-15 template agent, chromium nitrate nonahydrate and sucrose respectively. Mix chromium nitrate nonahydrate, sucrose and deionized water evenly to prepare a solution, then add the mixed solution to SBA-15, stir at room temperature for 4 hours, and then heat in a water bath to remove water;

[0028] ②After drying in an oven at 100°C for 12 hours, then calcined at 600°C for 4 hours in a nitrogen atmosphere, and then calcined in an air atmosphere at 450°C for 4 hours to obtain Cr-filled 2 o 3 SBA-15;

[0029] ③According to La 2 o 3 The mass percentage is the filled Cr obtained in ② 2 o 3 0.2% of SBA-15, weighed La(NO 3 ) 3 ·6H 2 O, add distilled water, stir to dissolve, form a solution, add to the filled Cr obtained in ② 2 o 3 Immerse in SBA-15 for 4 hours, dry at 100°C,...

Embodiment 3

[0032]① According to the total mass ratio of SBA-15 template agent to chromium nitrate nonahydrate and sucrose as 1:4, the mass ratio of chromium nitrate nonahydrate and sucrose as 100:8. Weigh the SBA-15 template agent, chromium nitrate nonahydrate and sucrose respectively. Mix chromium nitrate nonahydrate, sucrose and deionized water evenly to prepare a solution, then add the mixed solution to SBA-15, stir at room temperature for 4 hours, and then heat in a water bath to remove water;

[0033] ②After drying in an oven at 100°C for 12 hours, then calcined at 600°C for 4 hours in a nitrogen atmosphere, and then calcined in an air atmosphere at 450°C for 4 hours to obtain Cr-filled 2 o 3 SBA-15;

[0034] ③According to La 2 o 3 The mass percentage is the filled Cr obtained in ② 2 o 3 0.3% of SBA-15, weighed La(NO 3 ) 3 ·6H 2 O, add distilled water, stir to dissolve, form a solution, add to the filled Cr obtained in ② 2 o 3 Immerse in SBA-15 for 4 hours, dry at 100°C, ...

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Abstract

The invention discloses a preparation method of a catalyst for a gas phase fluorination reaction. The preparation method comprises dipping a SBA-15 template in chromium nitrate and cane sugar, carrying out roasting on SBA-15 filled with Cr2O3 so that the SBA-15 filled with Cr2O3 is loaded with lanthanum nitrate, carrying out roasting, removing the SBA-15 template by hydrofluoric acid and transforming La2O3 into LaF3 so that the catalyst is obtained. The catalyst has high activity and selectivity to a gas phase fluorination reaction.

Description

technical field [0001] The invention relates to a method for preparing a chemical catalyst, in particular to a method for preparing a catalyst for gas-phase fluorination reaction. Background technique [0002] In the field of fluorine chemical industry, since the ozone depletion potential (ODP) of hydrofluorocarbons (HFCs) is 0, the global warming potential (GWP) is small, and the refrigeration performance is similar to that of chlorofluorocarbons (CFCs), it is an ideal substitute for CFCs It is widely used in large-scale commercial refrigerants, foaming agents, fire extinguishing agents, etc. Gas-phase fluorine-chlorine exchange reaction is the key reaction for the selective synthesis of fluorine-containing compounds. It has been widely used in the industrial production process of hydrofluorocarbons due to its simplicity, economy and practicality, less pollution and easy operation. Common gas phase fluorination reactions such as: [0003] CF 3 CH 2 Cl+HF→CF 3 CH 2 F(H...

Claims

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Application Information

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IPC IPC(8): B01J27/132C07C17/20C07C19/08
Inventor 罗孟飞梁艳张文霞王芳
Owner ZHEJIANG NORMAL UNIVERSITY
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