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A catalyst for converting HFC-245FA into trans-1,3,3,3-tetrafluoropropene and its preparation method

A technology of hfc-245fa and tetrafluoropropene is applied in the field of dehydrofluorination catalysts and their preparation, which can solve the problems of easy coking and deactivation of catalysts, low selectivity and low conversion rate, and achieve high conversion rate and selectivity and catalyst life. High and easy-to-operate effect

Active Publication Date: 2018-06-22
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems in the process of dehydrofluorination of 1,1,1,3,3-pentafluoropropane into trans-HFO-1234ze, such as low selectivity, low conversion rate, easy coking and deactivation of the catalyst, etc.

Method used

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  • A catalyst for converting HFC-245FA into trans-1,3,3,3-tetrafluoropropene and its preparation method
  • A catalyst for converting HFC-245FA into trans-1,3,3,3-tetrafluoropropene and its preparation method
  • A catalyst for converting HFC-245FA into trans-1,3,3,3-tetrafluoropropene and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1)MgCr 2 o 4 Preparation:

[0021] According to MgO and Cr 2 o 3 The molar ratio is 1:1, respectively weigh 8.0g MgO, 30.4g Cr 2 o 3 , add 40ml of water to mix, dry at 120°C, and then bake at 800°C for 4 hours to get MgCr 2 o 4 .

[0022] (2) Ag-Ni / MgCr 2 o 4 Preparation:

[0023] According to the total mass of Ag and Ni is MgCr 2 o 4 10% of the mass, where the Ag / Ni ratio (mass) is: 1:1, weigh 10g MgCr respectively 2 o 4 , 2.48gNi(NO 3 ) 2 ·6H 2 O and 0.79gAgNO 3 , then add 20ml of water to stir and impregnate, dry at 120°C, bake at 500°C for 4 hours, and then reduce in hydrogen atmosphere at 400°C for 4 hours to obtain Ag-Ni / MgCr 2 o 4 .

[0024] (3)Na 2 CO 3 / Ag-Ni / MgCr 2 o 4 Catalyst preparation method:

[0025] According to Na 2 CO 3 The load is Ag-Ni / MgCr 2 o 4 1% of mass, weigh 0.1gNa 2 CO 3 and 10gAg-Ni / MgCr 2 o 4 , and then add 20ml of water to stir and impregnate, dry, and roast at 500°C for 4 hours in a nitrogen atmosphere to ...

Embodiment 2

[0029] MgCr 2 o 4 with Ag-Ni / MgCr 2 o 4The preparation method is the same as in Example 1, except that the Ag / Ni ratio (mass) is: 1:4, Na 2 CO 3 / Ag-Ni / MgCr 2 o 4 The preparation method of catalyst is with embodiment 1, Na 2 CO 3 The load is Ag-Ni / MgCr 2 o 4 1% of mass.

[0030] The reaction conditions and analysis and detection conditions are the same as in Example 1. The conversion rate of HFC-245fa and the selectivity of HFO-1234ze are shown in Table 1.

Embodiment 3

[0032] MgCr 2 o 4 with Ag-Ni / MgCr 2 o 4 The preparation method is the same as in Example 1, except that the Ag / Ni ratio (mass) is: 1:8, Na 2 CO 3 / Ag-Ni / MgCr 2 o 4 The preparation method of catalyst is with embodiment 1, Na 2 CO 3 The load is Ag-Ni / MgCr 2 o 4 1% of mass.

[0033] The reaction conditions and analysis and detection conditions are the same as in Example 1. The conversion rate of HFC-245fa and the selectivity of HFO-1234ze are shown in Table 1.

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Abstract

The invention provides a catalyst for converting HFC-245fa into trans 1,3,3-tetrafluoropropene and a preparation method thereof. MgCr2O4 as a carrier is used to load Ag-Ni and Na2CO3, the total weight of Ag and Ni is 10% of that of MgCr2O4, the mass ratio of Ag / Ni is 1:1-15, load amount of Na2CO3 is 1-5% of the weight of Ag-Ni / MgCr2O4. The preparation method of the catalyst is as below: preparing MgCr2O4, preparing Ag-Ni / MgCr2O4, and finally preparing the catalyst according to the load weight of the Na2CO3 being 1-5% of that of the Ag Ni / MgCr2O4. The preparation process of the catalyst is simple and easy to operate; the catalyst has high conversion rate reaction and high selectivity for conversion of 1,1,1,3,3-pentafluoropropane into HFO-1234ze, and has long service life.

Description

technical field [0001] The invention relates to a dehydrofluorination catalyst and a preparation method thereof. Specifically relates to a catalyst for converting 1,1,1,3,3-pentafluoropropane (HFC-245fa) into trans-1,3,3,3-tetrafluoropropene (E-HFO-1234ze) and its Preparation. Background technique [0002] 1,3,3,3-Tetrafluoropropene (HFO-1234ze), with zero ozone potential (ODP) and low global warming potential (GWP), is considered to be the most promising alternative to 1,1,1 , 2-Tetrafluoroethane (HFC-134a), one of the new generation of ODS substitutes, is widely used as a refrigerant, blowing agent, aerosol propellant, etc. HFO-1234ze has cis and trans isomers, among which, trans 1,3,3,3-tetrafluoropropene (E-HFO-1234ze) has a boiling point of -19°C, has excellent refrigeration performance, and is more and more popular focus on. [0003] At present, there are many synthetic methods of known trans-1,3,3,3-tetrafluoropropene. For example, the patent US2005 / 0020862 disclo...

Claims

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Application Information

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IPC IPC(8): B01J27/232C07C17/25C07C21/18
CPCB01J27/232C07C17/25C07C21/18
Inventor 罗孟飞罗建伟王月娟汪云宋通洋王会杰
Owner ZHEJIANG NORMAL UNIVERSITY
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