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-tetrafluoropropene from 1,1,1,3,3-pentafluoropropane, the composition of which is M x O y / AlF 3 , where the carrier AlF 3 It has an alpha phase structure and a specific surface area greater than 150m 2 ·g ‑1 , active carrier with pore size distribution concentrated in 15nm~40nm, M x O y For MgO, Fe 2 O 3 ,Co. 2 O 3 Or one of CuO, M x O y and AlF 3 The molar ratio is 1:5~50. The preparation method of the catalyst is: using active α-phase AlF with large specific surface area and mesoporous structure 3 As a carrier, the soluble salt of any element such as Mg, Fe, Co or Cu is loaded with equal amounts of impregnation method, and then dried and roasted at high temperature to form a catalyst. The catalyst in the present invention has excellent performance, does not need to use expensive precious metal compounds in the preparation process, has low cost and high activity. When reacting at 280°C, the conversion rate of 1,1,1,3,3-pentafluoropropane can reach 70%. Above, the catalyst has a long life, can operate stably for 360 hours, and does not need to introduce diluent gas during the reaction process, so it 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...

AI Technical Summary

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.