Catalyst for catalytic conversion of impurities in octafluorocyclobutane, and preparation method and application thereof

An octafluorocyclobutane, catalytic conversion technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of poor catalyst effect and difficult conversion and other problems, to achieve the effect of improving activity, simplifying process and good activity

Active Publication Date: 2020-05-12
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. CN104529691A discloses a method for catalytic conversion of impurities in perfluoroalkanes, the catalyst is AlF 3 A mixture of high-valent metal fluorides, the catalyst can convert most of the hydrogen-containing fluorocarbons and / or olefinic fluorocarbon impurities, but it is difficult to convert completely, especially after a period of reaction, the catalyst effect is significantly worse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The catalyst is prepared by the following steps:

[0030] (1) Activated carbon pretreatment: mix activated carbon with 5wt% nitric acid aqueous solution at a mass ratio of 1:3, stir evenly, treat at 60°C for 4h, wash with deionized water until neutral, and dry at 120°C for 5h to obtain Pretreated activated carbon.

[0031] (2) Preparation of catalyst precursor: add cobalt nitrate and yttrium nitrate to distilled water, stir and heat to 80°C, and after they are completely dissolved and cooled, a solution containing auxiliary components is obtained for use; In dilute hydrochloric acid with a fraction of 2%, a solution containing the active component is obtained. After mixing the solution containing the active component and the solution containing the auxiliary component, adjust the pH value of the solution to 6 with sodium carbonate to obtain a mixed solution. The pretreated activated carbon was added into the solution for equal volume impregnation for 3 hours, and after...

Embodiment 2

[0036] The catalyst is prepared by the following steps:

[0037] (1) Activated carbon pretreatment: mix activated carbon with 2wt% nitric acid aqueous solution at a mass ratio of 1:5, stir evenly, treat at 90°C for 2h, wash with deionized water until neutral, and dry at 100°C for 4h to obtain Pretreated activated carbon.

[0038] (2) Preparation of catalyst precursor: Silver nitrate and cerium nitrate are added to distilled water, stirred and heated to 90°C, and after they are completely dissolved and cooled, a solution containing auxiliary components is obtained for use; the active component palladium chloride Dissolve it in dilute hydrochloric acid with a mass fraction of 4% to obtain a solution containing the active component. After mixing the solution containing the active component and the solution containing the auxiliary component, adjust the pH value of the solution to 5 with sodium carbonate to obtain a mixed solution , add the pretreated activated carbon to the mixe...

Embodiment 3

[0043] The catalyst is prepared by the following steps:

[0044] (1) Activated carbon pretreatment: mix activated carbon with 8wt% nitric acid aqueous solution at a mass ratio of 1:4, stir evenly, treat at 70°C for 3h, wash with deionized water until neutral, and dry at 120°C for 8h to obtain Pretreated activated carbon.

[0045] (2) Prepare the catalyst precursor: add molybdenum nitrate and yttrium nitrate to distilled water, stir and heat to 80°C, and after they are completely dissolved and cooled, a solution containing auxiliary components is obtained for use; the active component palladium chloride Dissolved in dilute hydrochloric acid with a mass fraction of 6% to obtain a solution containing the active component, after mixing the solution containing the active component with the solution containing the auxiliary component, adjust the pH value of the solution to 6.5 with sodium carbonate to obtain a mixed solution , add the pretreated activated carbon to the mixed soluti...

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Abstract

The invention discloses a catalyst for catalytic conversion of impurities in octafluorocyclobutane, and a preparation method and an application thereof. The catalyst is composed of an active carbon loaded active component and auxiliary agents, the active component is palladium, the auxiliary agents are X1 and X2, the content of the active component palladium is 0.2-1.5 wt%, the content of the auxiliary agent X1 is 0.1-2.5 wt%, and the content of the auxiliary agent X2 is 0.05-0.8 wt%. The content of alkene-containing fluorocarbon impurities in octafluorocyclobutane can be reduced to 1 ppmv orbelow. The catalyst has the advantages of good performances, high separation efficiency and simplicity in operation.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a catalyst for catalytic conversion of impurities in octafluorocyclobutane, a preparation method and application thereof. Background technique [0002] Perfluorocycloalkanes are widely used in high-voltage insulation, aerosols, sprays, VLSI etchant, heat pump working fluid, among which octafluorocyclobutane (also known as perfluorocyclobutane) is particularly important. Octafluorocyclobutane has stable chemical properties, is non-toxic, has zero ozone depletion index, and has low greenhouse effect. It is a green and environmentally friendly special gas. With the implementation of the Montreal Protocol and the rapid growth of the electronics industry, the role of octafluorocyclobutane is becoming more and more important, and its usage is increasing year by year. Has a wide range of applications. [0003] Octafluorocyclobutane is one of the etching or cleaning gases comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/66B01J23/652B01J37/02B01J37/18C07C17/38C07C17/383C07C17/395C07C23/06
CPCB01J23/894B01J23/66B01J23/6525B01J37/0201B01J37/18C07C17/38C07C17/383C07C17/395C07C2601/04C07C23/06
Inventor 马利勇刘华平张坚文王金明郑佳
Owner JUHUA GROUP TECH CENT
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