Catalyst for compounding fluorine-containing halohydrocarbon and preparation method of catalyst

Abstract

The invention discloses a catalyst for compounding fluorine-containing halohydrocarbon and a preparation method of the catalyst and aims at solving problems that the specific surface area is small, the hole channel size is non-adjustable, an existing preparation method is expensive and complex, and the like in an existing preparation process. According to the catalyst disclosed by the invention, an active component comprises one or more of II group elements, VIII group elements, Cr or Cu; and a metal fluoride active carrier comprises one or more of aluminum fluoride, zirconium fluoride or magnesium fluoride. The preparation method of the metal fluoride-based catalyst which is large in specific surface area and has a mesoporous structure comprises the following steps: (1) preparing a turbid liquid solution of a metallic oxide which is large in specific surface area and has the mesoporous structure, and an organic polymeric additive, and backflowing at 0-100 DEG C; (2), dropwise adding an aqueous solution of a fluorinated reagent into the turbid liquid solution obtained in the step (1) for fluorination; and (3) dipping an aqueous solution of the active component into a metal fluoride base body obtained in the step (2), and roasting at 350-400 DEG C to obtain the catalyst.

Description

technical field [0001] The invention belongs to the field of refrigerants and relates to a metal fluoride catalyst, in particular to a large specific surface area and mesoporous metal fluoride catalyst used for synthesizing fluorine-containing halogenated hydrocarbons and a mild and simple preparation method thereof. Background technique [0002] In the gas-phase catalytic synthesis of fluorine-containing halogenated hydrocarbons, such as the preparation of the third-generation refrigerant hydrofluorocarbons (HFCs) and the fourth-generation refrigerant hydrofluoroolefins (HFOs), strong corrosive HF or one of the reactants 1. It may be generated during the reaction, so the catalyst used must be a material that can exist stably in a high-temperature HF atmosphere. So far, metal fluorides are the only substances that can exist stably in the above-mentioned strong corrosive atmosphere for a long time. However, metal fluorides must have a large specific surface area to obtain con...

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Problems solved by technology

[0004] Above-mentioned report prepares the catalyzer that fluorine-containing halogenated hydrocarbon is used, still exists following problem at least: (1) anhydrous sol-gel fluorination method is that the organic solvent of metal source and anhydrous HF is fluorine with expensive organometallic source, and this method must be operated under anhydrous conditions, the process is complicated, and it is difficult to apply to industrial production. At the same time, the metal fluorides obtained are all amorphous structures, unstable at high temperatures, and will quickly crystallize into low specific surface area and inactive fluorides. (2) Although the raw materials of carbonation and fluorination are easy to get, the technological process is complicated, and high-temperature carbonization and carbon removal processes need to be carried out repeatedly, and the energy consumption is high, and its preparation method does not see the regulation and control of the metal fluoride pore structure, so it is difficult to obtain the pore High specific surface area metal fluorides whose size is concentrated in the mesoporous structure, and the temperature is greater than 350°C, and the catalyst is less than 50m 2 / g

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