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Catalyst for preparing HFO-1234ze through cracking HFC-245fa and preparation method for catalyst

A technology of hfc-245fa and catalyst is applied in the field of chemical catalyst and its preparation, and can solve the problems of environmental pollution, complex preparation process, poor stability and the like

Active Publication Date: 2017-08-15
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to prepare 1,3,3,3-tetrafluoropropene (HFO-1234ze) by existing gas-phase catalytic 1,1,1,3,3-pentafluoropropane (HFC-245fa) dehydrofluorination The disadvantages such as complex preparation process, serious environmental pollution and poor stability provide a kind of 1,1,1,3 which can show high conversion rate, high selectivity and good stability at a lower temperature , Catalyst for producing 1,3,3,3-tetrafluoropropene by cracking 3-pentafluoropropane and preparation method thereof

Method used

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  • Catalyst for preparing HFO-1234ze through cracking HFC-245fa and preparation method for catalyst
  • Catalyst for preparing HFO-1234ze through cracking HFC-245fa and preparation method for catalyst
  • Catalyst for preparing HFO-1234ze through cracking HFC-245fa and preparation method for catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1)Cr 2 o 3 -NiO-MgF 2 Preparation of vector

[0020] According to the molar ratio of Cr / Ni is 1:1, its Cr 2 o 3 The mass percentage of the mixture with NiO is Cr 2 o 3 -NiO-MgF 2 2wt% of the total mass. Take 0.53gCr(NO 3 ) 3 9H 2 O and 0.38gNi(NO 3 ) 2 ·6H 2 O, dissolved in 20mL deionized water to obtain Ni(NO 3 ) 2 ·6H 2 O, Cr(NO 3 ) 3 9H 2 O mixed solution. Ni(NO 3 ) 2 ·6H 2 O, Cr(NO 3 ) 3 9H 2 O mixed solution added 9.8gMgF 2 In the powder, mix and impregnate for 2 hours, then pass through, dry at 100°C for 8 hours and bake in air atmosphere at 500°C for 4 hours to obtain the catalyst carrier Cr 2 o 3 -NiO-MgF 2 powder.

[0021] (2)V 2 o 5 -ZnO / Cr 2 o 3 -NiO-MgF 2 preparation of

[0022] Fixed V / Zn molar ratio of 4:1, according to V 2 o 5 The mass percentage of -ZnO composite oxide is carrier (Cr 2 o 3 -NiO-MgF 2 ) of 2wt%. Take 0.44gVOC 2 o 4 ·5H 2 O and 0.13gZn(NO 3 ) 2 ·6H 2 O dissolved in 20mL deionized water to pr...

Embodiment 2

[0027] (1)Cr 2 o 3 -NiO-MgF 2 The preparation of the carrier is the same as in Example 1.

[0028] (2)V 2 o 5 -ZnO / Cr 2 o 3 -NiO-MgF 2 preparation of

[0029] Fixed V / Zn molar ratio is 4:1, according to V 2 o 5 The mass percentage of -ZnO composite oxide is carrier (Cr 2 o 3 -NiO-MgF 2 ) of 3.5wt%. 0.77gVOC 2 o 4 ·5H 2 O and 0.23gZn(NO 3 ) 2 ·6H 2 O dissolved in 20mL deionized water to prepare VOC 2 o 4 ·5H 2 O and Zn(NO 3 ) 2 ·6H 2 O mixed solution. 9.65g carrier Cr 2 o 3 -NiO-MgF 2 Add to VOC 2 o 4 ·5H 2 O and Zn(NO 3 ) 2 ·6H 2 O mixed solution, soaked for 2 hours after mixing, then passed through, dried at 100°C for 8 hours and N 2 Calcined at 500°C for 4 hours in the atmosphere to obtain V 2 o 5 -ZnO / Cr 2 o 3 -NiO-MgF 2 powder.

[0030] (3)Ag 2 O / V 2 o 5 -ZnO / Cr 2 o 3 -NiO-MgF 2 Catalyst preparation

[0031] According to Ag 2 O mass percentage content is carrier (Cr 2 o 3 -NiO-MgF 2 ) of 0.15wt%. 0.0213gAgNO 3 Add to 20...

Embodiment 3

[0034] (1)Cr 2o 3 -NiO-MgF 2 The preparation of the carrier is the same as in Example 1.

[0035] (2)V 2 o 5 -ZnO / Cr 2 o 3 -NiO-MgF 2 preparation of

[0036] Fixed V / Zn molar ratio of 4:1, according to V 2 o 5 The mass percentage of -ZnO composite oxide is carrier (Cr 2 o 3 -NiO-MgF 2 ) of 5wt%. 1.10gVOC 2 o 4 ·5H 2 O and 0.33gZn(NO 3 ) 2 ·6H 2 O dissolved in 20mL deionized water to prepare VOC 2 o 4 ·5H 2 O and Zn(NO 3 ) 2 ·6H 2 O mixed solution. 9.5g carrier Cr 2 o 3 -NiO-MgF 2 Add to VOC 2 o 4 ·5H 2 O and Zn(NO 3 ) 2 ·6H 2 O mixed solution, soaked for 2 hours after mixing, then passed through, dried at 100°C for 8 hours and N 2 Calcined at 500°C for 4 hours in the atmosphere to obtain V 2 o 5 -ZnO / Cr 2 o 3 -NiO-MgF 2 powder.

[0037] (3)Ag 2 O / V 2 o 5 -ZnO / Cr 2 o 3 -NiO-MgF 2 Catalyst preparation

[0038] According to Ag 2 O mass percentage content is carrier (Cr 2 o 3 -NiO-MgF 2 ) of 0.20wt%. 0.0279gAgNO 3 Add to 20mL d...

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Abstract

The invention relates to a catalyst for preparing HFO-1234ze through cracking HFC-245fa and a preparation method for the catalyst. A support is Cr2O3-NiO-MgF2, the mole ratio of Cr / Ni is (0.5 to 2): 1, and the mass percent of a mixture of Cr2O3 and NiO is 2wt% the total mass of Cr2O3-NiO-MgF2; an active ingredient is a mixture of a V2O5-ZnO composite oxide and Ag2O, and the mole ratio of V / Zn is 4: 1, and the mass percent of the V2O5-ZnO composite oxide is 2wt% to 7wt% the mass of the support; the mass percent of the Ag2O is 0.05wt% to 0.35wt% the mass of the support. The preparation method comprises the steps of firstly, preparing the support by adopting a dipping method, and then, separately loading the V2O5-ZnO composite oxide and the Ag2O successively. The catalyst has relatively high activity, selectivity and stability under the condition of relatively low reaction temperatures.

Description

technical field [0001] The invention relates to a chemical catalyst and a preparation method thereof, in particular to a catalyst used for cracking HFC-245fa to produce HFO-1234ze and a preparation method thereof. Background technique [0002] CFCs are currently the third generation of refrigerants with superior physical and chemical properties such as non-toxic, non-corrosive, good refrigeration effect, mutual solubility and stable chemical properties, and are relatively widely used in practical applications. However, the ODP and GWP required by other countries such as the European Union are limited, resulting in a certain impact on third-generation refrigerants. Therefore, it is particularly important to prepare compounds that do not contain chlorine substitution and only contain elements such as C, H, and F. In this regard, 1,3,3,3-tetrafluoropropene (HFO-1234ze) has the advantages of zero ozone depletion value (ODP) and low global warming potential value (GWP). It is w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J23/06B01J23/50B01J32/00B01J37/02B01J37/08C07C17/25C07C21/18
Inventor 罗孟飞宋建冬汪云王月娟
Owner ZHEJIANG NORMAL UNIVERSITY