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Catalyst for producing tetrafluoromethane with gas-phase fluoridation and production method

A tetrafluoromethane, gas phase fluorination technology, applied in the direction of halogen substitution preparation, etc., can solve the problems of poor activity and low stability, and achieve the effects of fast price, high catalytic activity or selectivity, and high application value

Inactive Publication Date: 2008-09-24
ZHEJIANG NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to provide a catalyst with high activity, high selectivity, high stability and easy regeneration for the disadvantages of poor activity and low stability of existing catalysts for gas-phase fluorination reactions. Catalyst and preparation method for producing tetrafluoromethane by gas-phase fluorination

Method used

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  • Catalyst for producing tetrafluoromethane with gas-phase fluoridation and production method
  • Catalyst for producing tetrafluoromethane with gas-phase fluoridation and production method
  • Catalyst for producing tetrafluoromethane with gas-phase fluoridation and production method

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Experimental program
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Effect test

Embodiment 1

[0029] First, weigh CrCl according to the loading amount of Cr as 70wt%. 3 and Y(OH) 3 , mix well with an appropriate amount of water, add a certain amount of Na with a concentration of 2mol / L 2 CO 3 After the precipitation is complete, it is separated and washed until the filtrate is neutral, and then the precipitate is dried at 90°C. The dried precipitate was molded and then heated at 400°C under N 2Calcination was carried out in the atmosphere for 12 hours to obtain a fluorinated catalyst precursor. The fluorination catalyst precursor was treated with anhydrous HF at 600° C. for 2 hours to obtain a fluorination catalyst. Its reactivity or selectivity are shown in Table 1, Table 2, Table 3, Table 4.

Embodiment 2

[0031] First, weigh Cr according to the loading amount of Cr being 20wt%, and the doping amount of Fe being 2wt%. 2 o 3 , FeCl 3 and Y 2 o 3 , mix evenly with an appropriate amount of water, add a certain amount of ammonia water with a concentration of 2mol / L until the precipitation is complete, then separate and wash until the filtrate is neutral, and then dry the precipitate at 140°C. After drying, the precipitate was molded at 650°C and N 2 Calcination was carried out in the atmosphere for 2 hours to obtain a fluorinated catalyst precursor. The fluorination catalyst precursor was treated with anhydrous HF at 380° C. for 24 hours to obtain a fluorination catalyst. Its reactivity or selectivity are shown in Table 1, Table 2, Table 3, Table 4.

Embodiment 3

[0033] First, weigh Cr(OH) according to the loading amount of Cr being 50wt%, and the doping amount of Ga being 3wt%. 3 , Ga 2 o 3 and Y(NO 3 ) 3 , mix well with an appropriate amount of water, add a certain amount of 2mol / L (NH 4 ) 2 CO 3 After the precipitation is complete, it is separated and washed until the filtrate is neutral, and then the precipitate is dried at 120°C. After the dried precipitate was molded, it was heated at 250°C and H 2 Calcined in the atmosphere for 48 hours to obtain a fluorinated catalyst precursor. The fluorination catalyst precursor was treated with anhydrous HF at 500° C. for 8 hours to obtain a fluorination catalyst. Its reactivity or selectivity are shown in Table 1, Table 2, Table 3, Table 4.

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Abstract

The invention relates to a catalyst used for making tetrafluoromethane through gas-phase fluorination and a preparation method thereof, and aims at providing a catalyst used for making tetrafluoromethane through gas-phase fluorination characterized by high activity and high stability and a preparation method thereof in consideration of poor activity and low stability existing in the existing gas-phase fluorination catalyst. The preparation method of the catalyst of the invention is as follows: one or more than one compound of Y, compound of Cr, compound of magnesium, aluminum, indium, gallium, zinc, scandium, strontium, iron, cobalt, nickel and cadmium are measured according to a certain proportion; the precipitator adopts one among ammonia, sodium hydroxide, ammonium carbonate, sodium carbonate and potassium hydroxide, and sediments are obtained by a coprecipitation method, and the precursor of the catalyst is obtained by baking and roasting the sediments then the catalyst is obtained after being treated with anhydrous hydrogen fluoride.

Description

technical field [0001] The invention relates to a catalyst for gas-phase fluorination reaction, in particular to a catalyst and a preparation method for gas-phase fluorination to produce tetrafluoromethane. Background technique [0002] Tetrafluoromethane (hereinafter referred to as FC-14) can be used as, for example, plasma etching gas and cleaning gas in the microelectronics industry and semiconductor manufacturing industry, and also has applications in low-temperature refrigeration, but the production cost of FC-14 is limited There has been widespread commercial interest in using this compound. [0003] To produce FC-14, the following methods have been disclosed so far: (1) A method of reacting carbon with fluorine gas; (2) A method of reacting hydrofluoromethane with fluorine gas; (3) A method of thermally decomposing tetrafluoroethylene ; (4) gas phase fluorination of chlorofluoromethane and anhydrous hydrogen fluoride. The disadvantages of the above methods (1) and (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J23/887C07C17/20C07C19/08
Inventor 罗孟飞钱林鲁继青何军谢冠群周黎旸陈科峰张学良张彦苏利红
Owner ZHEJIANG NORMAL UNIVERSITY
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