Catalyst for preparing 1,3,3,3-tetrafluoropropene from 1,1,1,3,3-pentafluoropropane

Abstract

The invention discloses a catalyst for preparing 1,3,3,3-tetrafluorohydrazine propylene from 1,1,1,3,3-perfluoropropane. The composition is MxOy / AlF3, wherein a carrier AlF3 is an active carrier which is of an alpha phase structure, has the specific surface area greater than 150 m<2>.g<-1> and has the aperture distribution concentrated at 15 to 40 nm; MxOy is one of MgO, Fe2O3, Co2O3 or CuO; the mole ratio of MxOy to AlF4 is 1: (5 to 50). A preparation method of the catalyst comprises the following steps: carrying soluble salt of any element of Mg, Fe, Co or Cu through active alpha-phase AlF3 which has a large specific surface area and a mesoporous structure and serves as the carrier via an equivalent immersion method, and preparing the catalyst through drying and high temperature roasting. The catalyst disclosed by the invention is excellent in performance; in a preparation process, no expensive noble metal compounds are needed, the cost is low, and the activity is high; during reaction at 280 DEG C, the conversion ratio of the 1,1,1,3,3-perfluoropropane is 70 percent or above, and the catalyst is long in service life and can stably work for 360 hours; meanwhile, no diluting gas is fed in the reaction process, and the catalyst has industrial application value.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for preparing 1,3,3,3-tetrafluoropropene from 1,1,1,3,3-pentafluoropropane. Background technique [0002] 1,3,3,3-Tetrafluoropropene (HFO-1234ze) has an ozone depletion potential (ODP) of zero and a global warming potential (GWP) of only 6. As a green product, it is widely used in blowing agents and aerosols Propellant and other industries. HFO-1234ze is also a polymerization monomer for synthesizing high-stability and high-elastic rubber plastics, and is widely used in fire protection, aviation and aerospace and other fields. Catalytic cracking and dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to prepare HFO-1234ze is an economical and feasible route. [0003] Patent CN103537305B reported Ni-Ag-Cr 2 o 3 -AlF 3 As a catalyst for the cracking of HFC-245fa to co-produce HFO-1234ze and 2,3,3,3-tetrafluoropropene (HFO-1234yf), in the presence of diluent gas nitrogen, re...

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Problems solved by technology

[0004] Patent US5986151A reports that 1% Pd / C is used as a catalyst for preparing HFO-1234ze from HFC-245fa, reacting at 471 °C, the conversion rate of HFC-245fa is 92.4%, the selectivity of HFO-1234ze is 97.2%, the reaction temperature is high, and the catalyst used For Pd / C, the cost is high

[0005] At present, the catalyst for preparing HFO-1234ze from HFC-245fa needs to use expensive noble metal compounds in the preparation process, which is costly, and dilute gas needs to be introduced during the reaction process, which increases the cost of separation in the later stage.