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Method for reducing carbon deposition of catalyst in resource utilization of HFC-23

A technology of HFC-23 and catalyst, which is applied in the field of HFC-23 resource utilization, can solve the problems of reduced product selectivity, etc., and achieve the effects of improving stability, good synergy and prolonging service life

Active Publication Date: 2021-06-18
ZHEJIANG RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method improves the stability of the catalyst, the selectivity of the by-product CFC-12 is greatly improved, reaching 2% to 8%, and the product selectivity decreases

Method used

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  • Method for reducing carbon deposition of catalyst in resource utilization of HFC-23
  • Method for reducing carbon deposition of catalyst in resource utilization of HFC-23

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Catalyst preparation: pretreat the chromium trioxide catalyst (the main catalyst), the pretreatment process includes: 1) 250 ° C fluorination treatment for 2 hours under a mixed atmosphere of 10% hydrogen fluoride and 90% nitrogen; 2) under a hydrogen fluoride atmosphere, Treat at 300°C for 5 hours; 3) Purge nitrogen to lower the temperature. Pour the fluorinated pretreated catalyst into n-hexane, stir and disperse evenly, add the Ru nanocolloid dispersion drop by drop, control the mass content of the Ru load to 0.1%, keep stirring continuously for 4 hours, and the upper layer of the solution becomes transparent After clarification, transfer it to a rotary evaporator, evaporate to dryness at 80°C, dry in an oven at 110°C overnight, and roast in a muffle furnace at 400°C for 6 hours to obtain a shaped catalyst, which is designated as Catalyst 1.

[0035] Recycling of HFC-23: Pass trifluoromethane, chloroform and hydrogen into a reactor containing 50ml of catalyst 1 at a ra...

Embodiment 2

[0037] Catalyst preparation: pretreat the chromium trioxide catalyst (the main catalyst), the pretreatment process includes: 1) 250 ° C fluorination treatment for 2 hours under a mixed atmosphere of 10% hydrogen fluoride and 90% nitrogen; 2) under a hydrogen fluoride atmosphere, Treat at 300°C for 5 hours; 3) Purge nitrogen to lower the temperature. Pour the fluorinated pretreated catalyst into n-hexane, stir and disperse evenly, add the Pt nano-colloid dispersion drop by drop, control the Pt loading at 0.1wt%, keep stirring continuously for 4 hours, and the upper layer of the solution becomes transparent and clear After that, it was transferred into a rotary evaporator, evaporated to dryness at 80°C, dried in an oven at 110°C overnight, and calcined in a muffle furnace at 400°C for 6 hours to obtain a shaped catalyst, which was designated as Catalyst 2.

[0038] Recycling of HFC-23: Pass trifluoromethane, chloroform and hydrogen into a reactor containing 50ml of catalyst 2 at...

Embodiment 3

[0040] Catalyst preparation: pretreat the chromium trioxide catalyst (the main catalyst), the pretreatment process includes: 1) 250 ° C fluorination treatment for 2 hours under a mixed atmosphere of 10% hydrogen fluoride and 90% nitrogen; 2) under a hydrogen fluoride atmosphere, Treat at 300°C for 5 hours; 3) Purge nitrogen to lower the temperature. Pour the fluorinated pretreated catalyst into n-hexane, stir and disperse evenly, add the Pd nano-colloid dispersion drop by drop, control the mass loading of Pd at 0.1%, keep stirring continuously for 4 hours, and the upper layer of the solution becomes transparent and clear After that, it was transferred into a rotary evaporator, evaporated to dryness at 80°C, dried in an oven at 110°C overnight, and calcined in a muffle furnace at 400°C for 6 hours to obtain a shaped catalyst, which was designated as Catalyst 3.

[0041] Recycling of HFC-23: Pass trifluoromethane, chloroform and hydrogen into a reactor containing 50ml of catalys...

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Abstract

The invention discloses a method for reducing carbon deposition of a catalyst in resource utilization of HFC-23. The resource utilization is realized by performing a fluorine-chlorine exchange reaction on HFC-23 and halogenated hydrocarbon; the catalyst for the fluorine-chlorine exchange reaction comprises a main catalyst and a noble metal; the noble metal is at least one selected from Pt, Pd, Ru, Au and Rh, and the addition amount of the noble metal is 0.01-2 wt%; and hydrogen is introduced in the process of the fluorine-chlorine exchange reaction. The catalyst used in the invention has the advantages of good stability, long service life and the like.

Description

technical field [0001] The invention relates to HFC-23 resource utilization, in particular to a method for reducing catalyst surface area carbon and improving catalyst stability during HFC-23 resource utilization. Background technique [0002] HFC-23 (CHF 3 , trifluoromethane, R23) is the industrial production of HFC-22 (HCFC-22, difluorochloromethane, R22 or CHClF 2 ) is an inevitable by-product, has a strong greenhouse effect, and its global warming potential (GWP, Global Warming Potential) is CO 2 14800 times. According to statistics, my country's HFC-23 emissions accounted for 68% of the world's emissions in 2013, with an output of more than 20,000 tons, equivalent to CO 2 Annual emissions reached 296 million tons. Therefore, the resource utilization of HFC-23 is an important topic in realizing energy saving and emission reduction. [0003] At present, in the industry, the by-product HFC-23 produced in the production process of HCFC-22 is generally treated by direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652B01J23/89B01J27/13B01J37/26B01J38/10C07C17/20C07C19/10
CPCB01J38/10B01J37/26B01J23/6522B01J27/13B01J23/8993C07C17/202C07C19/10B01J23/462B01J27/132B01J23/42B01J23/44B01J27/12B01J35/23C07C17/204C07C17/206
Inventor 周飞翔韩文锋王术成刘武灿张建君李西良
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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