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Catalyst for catalytic hydrodechlorination, and preparation method and application thereof

A catalytic hydrogenation and catalyst technology, which is applied in the field of preparation of hydrodechlorination catalysts, can solve the problems of poor catalyst stability, low conversion rate, and short service life, and achieve the effects of good stability, low cost, and high selectivity

Active Publication Date: 2020-04-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the above CFC-113 hydrodechlorination preparation CTFE process in the prior art, although the catalyst has been improved to a certain extent, there are still high cost and conversion low efficiency, poor catalyst stability, short life and many other problems

Method used

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  • Catalyst for catalytic hydrodechlorination, and preparation method and application thereof
  • Catalyst for catalytic hydrodechlorination, and preparation method and application thereof
  • Catalyst for catalytic hydrodechlorination, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of Ru-Ni-Li / AC Catalyst

[0039] Configure a certain amount of RuCl 3 ·3H 2 O and NiCl 2 ·6H 2 O mixed solution, the mass fractions were 5.0wt% and 10.0wt%, followed by equal volume impregnation of the pretreated activated carbon, and dried at 90°C for 6h. The dried catalyst precursor was placed in a tube furnace, fed with He gas, the temperature was raised to 320 °C at a rate of 5 °C / min, calcined for 8 h, and then naturally cooled to room temperature to form a Ru-Ni / AC catalyst precursor. An equal volume of 5.2 wt% LiCl solution was impregnated into the Ru-Ni / AC catalyst precursor and dried at 60 °C for 8 h. The dried material was placed in a tube furnace, fed with Ar gas, the temperature was raised to 420°C at a rate of 5°C / min, calcined for 9h, and then naturally cooled to room temperature. The obtained catalyst was Ru-Ni-Li / AC catalyst.

Embodiment 2

[0041] Preparation of Ru-Ti-Pt-Sm / AC Catalyst

[0042] Configure a certain amount of RuCl 3 ·3H 2 O, TiCl 4 and PtCl 2 Mix the solution, the mass fractions are 3.6wt%, 9.6wt% and 1.3wt%, then impregnate the pretreated activated carbon with equal volume, and dry at 105°C for 12h. The dried catalyst precursor was put into a tube furnace, fed with He gas, the temperature was raised to 500°C at 5°C / min, calcined for 7h, and then naturally cooled to room temperature to form a Ru-Ti-Pt / AC catalyst precursor . 0.8wt% SmCl 3 An equal volume of the solution was impregnated into the Ru-Ti-Pt / AC catalyst precursor, and dried at 75 °C for 10 h. The dried material was placed in a tube furnace and fed with N 2 Gas, the temperature was raised to 480°C at 5°C / min, calcined for 13 hours, and then naturally cooled to room temperature. The obtained catalyst was Ru-Ti-Pt-Sm / AC catalyst.

Embodiment 3

[0044] Preparation of Ru-Co-Cs-Sc Catalyst

[0045] Configure a certain amount of RuCl 3 ·3H 2 O and Co(NO3) 2 ·6H 2 O mixed solution, the mass fractions were 2.7wt% and 8.4wt%, followed by an equal volume impregnation of the pretreated activated carbon, and dried at 110 °C for 11 h. The dried catalyst precursor was placed in a tube furnace and fed with N 2 / He mixed gas, the temperature was raised to 385 °C at 5 °C / min, calcined for 16 h, and then naturally cooled to room temperature to form a Ru-Co / AC catalyst precursor. 2.8wt% CsNO3 and 9.8wt% ScCl 3 An equal volume of the mixed solution was impregnated into the Ru-Ni / AC catalyst precursor, and dried at 95 °C for 16 h. Put the dried material into a tube furnace, feed Ar gas, raise the temperature to 360°C at 5°C / min, calcinate for 7h, and then naturally cool to room temperature. The obtained catalyst is Ru-Co-Cs-Sc / AC catalyst .

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Abstract

The invention discloses a catalyst for catalytic hydrodechlorination, and a preparation method and an application thereof. The catalyst for catalytic hydrodechlorination comprises an alloy catalyst, an auxiliary agent and a carrier, the alloy catalyst takes element Ru as a main body, and any one or more of specified alloy elements Re, Ti, Cr, Ni, Al, Co, Cu, Nb, Ta, Ru, Pt and Ag are selected to form an alloy with Ru; and the auxiliary agent is alkali metal or rare earth metal, and the carrier is an activated carbon carrier. The catalyst is simple in preparation method and convenient to operate, and has the advantages of low cost, high activity, high selectivity, good stability, mild reaction conditions and the like; the catalyst is applied to a reaction for preparing chlorotrifluoroethylene through catalytic hydrodechlorination of trichlorotrifluoroethane; and the catalyst is good in catalytic hydrodechlorination reaction temperature, instant in reaction at the temperature of 200-550DEG C, high in activity and high in chlorotrifluoroethylene selectivity, the activity of the catalyst reaches 85% or above, the maximum conversion rate of the catalyst reaches 95.7%, and the maximum selectivity of the catalyst reaches 95.6%.

Description

technical field [0001] The invention relates to the technical field of preparation of a hydrodechlorination catalyst, in particular to a catalyst for catalytic hydrodechlorination and its preparation method and application. Background technique [0002] Chlorotrifluoroethylene (CTFE) is an important fluorine-containing polymer monomer, which can be used to prepare a series of chemical products such as fluorine-containing coatings, fluorine-containing resins, fluorine-containing rubber and fluorine-chlorine lubricating oil. In addition, chlorotrifluoroethylene can also be used to prepare downstream products such as trifluoroethylene, bromotrifluoroethylene, hexafluorobutadiene, trifluorostyrene, 2,3,3,3-tetrafluoropropene, fluorobrominated oil, etc. . 1,1,2-Trifluoro-1,2,2-trichloroethane (CFC-113) is an important chemical raw material and is also used to prepare chlorotrifluoroethylene (CTFE) and trifluoroethylene (HFC- 1123) common raw materials. [0003] Using CFC-113 a...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/63B01J23/648B01J23/66C07C17/23C07C21/18
CPCB01J23/8946B01J23/63B01J23/8993B01J23/894B01J23/6486B01J23/6484B01J23/66C07C17/23C07C21/18
Inventor 李利春张武剑杜傲侠张歌珊刘宗健
Owner ZHEJIANG UNIV OF TECH
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