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Catalyst for removing HF from HFC-245fa as well as preparation method and application of catalyst

A technology of hfc-245fa and catalyst, applied in the field of chemical catalyst and its preparation, to achieve the effect of convenient preparation process, high catalytic activity and low price

Pending Publication Date: 2020-06-30
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no catalyst for HFC-245fa to remove HF and co-produce TFP, HFO-1234yf and HFO-1234yf

Method used

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  • Catalyst for removing HF from HFC-245fa as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1)Cr(OH) 3 Preparation of solid powder

[0024] Cr(OH) 3 The solid powder is prepared by precipitation method: first weigh 50g Cr(NO 3 ) 3 ·9H 2 O crystals are placed in a beaker, add 250mL deionized water, stir to dissolve to form Cr(NO 3 ) 3 Solution; take another 50mL concentrated NH 3 ·H 2 O in a beaker, add 200mL deionized water to dilute. Then the Cr(NO 3 ) 3 The solution is dropped into dilute NH 3 ·H 2 In the O solution, after 2 hours of stirring, the precipitate was separated by precipitation and centrifugation, washed three times with 50 mL of distilled water, the precipitate was dried in an oven at 100°C for 8 hours, and ground to obtain Cr(OH) 3 Solid powder

[0025] (2) ZnO-NiO / Al 2 O 3 -Cr 2 O 3 Preparation

[0026] The fixed Zn / Ni molar ratio is 4:1, and the carrier Al is based on the mass percentage of ZnO-NiO composite oxide 2 O 3 -Cr 2 O 3 1.5wt% of Al 2 O 3 -Cr 2 O 3 The molar ratio of Al to Cr is 1:30. Take 0.2038g Zn(NO 3 ) 2 ·6H 2 O and 0.0498g Ni(NO 3 ...

Embodiment 2

[0031] (1)Cr(OH) 3 The preparation of the solid powder is the same as in Example 1.

[0032] (2) ZnO-NiO / Al 2 O 3 -Cr 2 O 3 Preparation

[0033] The fixed Zn / Ni molar ratio is 4:1, and the carrier Al is based on the mass percentage of ZnO-NiO composite oxide 2 O 3 -Cr 2 O 3 1.5wt% of Al 2 O 3 -Cr 2 O 3 The molar ratio of Al to Cr is 1:25. Take 0.1705g Zn(NO 3 ) 2 ·6H 2 O and 0.0417g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 10mL deionized water to prepare Zn(NO 3 ) 2 ·6H 2 O and Ni (NO 3 ) 2 ·6H 2 O mixed solution. Weigh 5.0470g of Cr(OH) obtained in step (1) 3 Solid powder and 0.1176g AlOOH (alumina monohydrate) are added to Zn(NO 3 ) 2 ·6H 2 O and Ni (NO 3 ) 2 ·6H 2 O mixed solution, soak for 4 hours after mixing, dry at 100℃ for 8 hours, 2 Fired at 500°C for 4 hours in the atmosphere, then lowered to room temperature, switched to air and heated to 500°C for 4 hours to produce ZnO-NiO / Al 2 O 3 -Cr 2 O 3 Solid powder.

[0034] (3)ZnF 2 -NiF 2 / AlF 3 -Cr 2 O 3 The catalyst preparation is...

Embodiment 3

[0037] (1)Cr(OH) 3 The preparation of the solid powder is the same as in Example 1.

[0038] (2) ZnO-NiO / Al 2 O 3 -Cr 2 O 3 Preparation

[0039] The fixed Zn / Ni molar ratio is 4:1, and the carrier Al is based on the mass percentage of ZnO-NiO composite oxide 2 O 3 -Cr 2 O 3 1.5wt% of Al 2 O 3 -Cr 2 O 3 The molar ratio of Al to Cr is 1:20. Take 0.1373g Zn(NO 3 ) 2 ·6H 2 O and 0.0336g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 10mL deionized water to prepare Zn(NO 3 ) 2 ·6H 2 O and Ni (NO 3 ) 2 ·6H 2 O mixed solution. Weigh 4.0376g of Cr(OH) obtained in step (1) 3 Solid powder and 0.1176g AlOOH (alumina monohydrate) are added to Zn(NO 3 ) 2 ·6H 2 O and Ni (NO 3 ) 2 ·6H 2 O mixed solution, soak for 4 hours after mixing, dry at 100℃ for 8 hours, 2 Fired at 500°C for 4 hours in the atmosphere, then lowered to room temperature, switched to air and heated to 500°C for 4 hours to produce ZnO-NiO / Al 2 O 3 -Cr 2 O 3 Solid powder.

[0040] (3)ZnF 2 -NiF 2 / AlF 3 -Cr 2 O 3 The catalyst preparation is...

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Abstract

The invention discloses a catalyst for removing HF from HFC-245fa and a preparation method and application of the catalyst, wherein a precursor of the catalyst is composed of a carrier and an active component, the carrier is Al2O3-Cr2O3, and the molar ratio of Al to Cr is 1:(30-10); the active component is ZnO-NiO, and the molar ratio of Zn to Ni is (2-6):1; the content of the active component is0.5 to 2.5 wt% of the carrier; the preparation method of the catalyst adopts an impregnation-fluorination method, ZnO-NiO is firstly loaded on the carrier Al2O3-Cr2O3, and then fluorination is carriedout in an anhydrous HF atmosphere, so that the obtained catalyst has relatively high catalytic activity and selectivity of TFP, HFO-1234yf and HFO-1234ze.

Description

Technical field [0001] The invention relates to a chemical catalyst and a preparation method thereof, in particular to a chemical catalyst used for 1,1,1,3,3-pentafluoropropane (HFC-245fa) to produce 3,3,3-trifluoropropyne by removing HF (TFP), 2,3,3,3-tetrafluoropropene (HFO-1234yf) and 1,3,3,3-tetrafluoropropene (HFO-1234ze) catalysts and preparation methods thereof. Background technique [0002] At present, the third-generation refrigerant hydrofluoroalkanes (HFCs) 1,1,1,2-tetrafluoroethane (HFC-134a), due to its zero ozone depletion potential (ODP), is widely used in modern society Refrigerant. However, HFC-134a has a high greenhouse effect potential (GWP=1300), stays in the atmosphere for a long time, and large-scale use will cause global warming. Therefore, it is urgent to develop a new generation of more environmentally friendly refrigerants. of. Hydrofluoroolefins (HFO-1234ze and HFO-1234yf) have the advantages of short atmospheric life, ODP=0, and low GWP. They are co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86C07C17/25C07C21/18
CPCB01J23/866C07C17/25C07C21/18
Inventor 罗孟飞方秀秀王月娟方晨涛
Owner ZHEJIANG NORMAL UNIVERSITY
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