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A method for reducing catalyst carbon deposition in hfc-23 resource utilization

A technology of HFC-23 and catalyst is applied in the field of HFC-23 resource utilization, which can solve the problems of reduced product selectivity, and achieve the effects of improving stability, inhibiting carbon deposition, and improving stability and life.

Active Publication Date: 2022-06-28
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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  • A method for reducing catalyst carbon deposition in hfc-23 resource utilization
  • A method for reducing catalyst carbon deposition in hfc-23 resource utilization

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Experimental program
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Effect test

Embodiment 1

[0034] Preparation of catalyst: Pretreatment of chromium trioxide catalyst (main catalyst), the pretreatment process includes: 1) 10% hydrogen fluoride and 90% nitrogen mixed atmosphere, 250 ℃ fluorination treatment for 2 hours; 2) hydrogen fluoride atmosphere, Treat at 300°C for 5 hours; 3) Purge with nitrogen to cool down. Pour the fluorinated pretreated catalyst into n-hexane, stir and disperse evenly, add Ru nano-colloid dispersion drop by drop, control the mass content of Ru loading to 0.1%, continue stirring for 4 hours and then let stand, the upper layer of the solution becomes transparent After clarification, it was transferred to a rotary evaporator, rotary 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 recorded as catalyst 1.

[0035] HFC-23 resource utilization: pass trifluoromethane, chloroform and hydrogen at 1:1.5:0.2 (molar ratio) into the reactor e...

Embodiment 2

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

[0038] HFC-23 resource utilization: pass trifluoromethane, chloroform and hydrogen at 1:1.5:0.2 (molar ratio) into the reactor equipped with 50ml of catalyst 2, the reaction...

Embodiment 3

[0040] Preparation of catalyst: Pretreatment of chromium trioxide catalyst (main catalyst), the pretreatment process includes: 1) 10% hydrogen fluoride and 90% nitrogen mixed atmosphere, 250 ℃ fluorination treatment for 2 hours; 2) hydrogen fluoride atmosphere, Treat at 300°C for 5 hours; 3) Purge with nitrogen to cool down. Pour the fluorinated pretreated catalyst into n-hexane, stir and disperse evenly, add 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 Then transferred to a rotary evaporator, rotary evaporated to dryness at 80 °C, dried overnight at 110 °C in an oven, and calcined in a muffle furnace at 400 °C for 6 h to obtain a shaped catalyst, which was recorded as catalyst 3.

[0041] HFC-23 resource utilization: pass trifluoromethane, chloroform and hydrogen into a reactor equipped with 50ml of catalyst 3 at 1:1.5:0.2 (molar ratio)...

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Abstract

The invention discloses a method for reducing catalyst carbon deposition in resource utilization of HFC-23. The resource utilization adopts HFC-23 and halogenated hydrocarbon to carry out fluorine-chlorine exchange reaction, and the catalyst of the fluorine-chlorine exchange reaction includes a main body Catalyst and noble metal, the noble metal is selected from at least one of Pt, Pd, Ru, Au or Rh, and the addition amount is 0.01-2wt%. During the process of the fluorine-chlorine exchange reaction, hydrogen gas is introduced. The invention has the advantages of good catalyst stability, long service life and the like.

Description

technical field [0001] The invention relates to the resource utilization of HFC-23, in particular to a method for reducing the carbon on the surface of the catalyst and improving the stability of the catalyst during the resource utilization of HFC-23. 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 with a strong greenhouse effect, and its Global Warming Potential (GWP, Global Warming Potential) is CO 2 14800 times. According to statistics, in 2013, my country's HFC-23 emissions accounted for 68% of the world's emissions, 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 issue in realizing energy saving and emission reduction. [0003] At present, the by-product HFC-23 produced in the production process of HCFC-22 is gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652B01J23/89B01J27/13B01J37/26B01J38/10C07C17/20C07C19/10
CPCB01J38/10B01J37/26B01J23/6522B01J27/13B01J23/8993C07C17/202C07C19/10B01J23/462B01J27/132B01J23/42B01J23/44B01J27/12B01J35/45C07C17/204C07C17/206
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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