Preparation method of catalyst for fluorine-chlorine exchange

The invention provides the preparation method of the catalyst for fluorine-chlorine exchange, gas-phase gel is used for preparing the catalyst which has the advantages of high specific surface area, high dispersity and high void, and one or two or more substances of chromium chloride, magnesium chloride and aluminum chloride are complexed in an organic solvent to obtain the catalyst for fluorine-chlorine exchange. And freezing and drying at low temperature to prepare the aerogel catalyst with regular shape, uniform particle size and good performance. And the granules are not required to be arranged after being directly cut. The catalyst prepared by the invention is used for preparing hexafluoroethane from pentafluoromonochloroethane, and has high selectivity and good stability. 本发明提供了一种用于氟氯交换的催化剂制备方法，使用气相凝胶制备具有比表面积高、高分散性、高空隙的优点，使用氯化铬、氯化镁、氯化铝的一种或者两种或者多种物质在有机溶剂下进行络和，低温冷冻干燥制备出形状规则且粒径均一、性能良好的气凝胶催化剂。直接分割使用无需在进行整粒。本发明所制备的催化剂用于五氟一氯乙烷生成六氟乙烷的制备，其具有高选择性以及良好的稳定性。