Preparation method of catalyst for difluoromethane

Abstract

The invention discloses a preparation method of a catalyst for difluoromethane, and relates to the technical field of chemical catalysts. The method comprises the steps of material taking, precipitation, separation, drying, drying treatment, molding and detection, and has the beneficial effects that after the technical scheme is adopted, the gas chromatography-mass spectrometry method is used as apreparation basic method, and a detection process is added, so that the content of substances obtained after the catalyst is prepared can be detected, and whether the content reaches the standard ornot can be detected; the reaction performance of the catalyst is fully guaranteed, and the catalytic efficiency and the performance stability after the catalyst is put into use are guaranteed; and resources are saved, waste is reduced, the working cost is reduced, and the method is suitable for large-batch industrial production.

Description

technical field [0001] The invention relates to the technical field of chemical catalysts, in particular to a method for preparing a catalyst for difluoromethane. Background technique [0002] Difluoromethane (HFC-32) has a low boiling point, a large refrigeration coefficient, almost zero depletion value for the atmospheric ozone layer, and a small greenhouse effect coefficient. It is recognized as an ideal ODS substitute and has been developed and accepted at home and abroad. Applied to various refrigerants. One of the ways to produce HFC-32 is to produce difluoromethane by gas-phase catalytic fluorination of dichloromethane. At present, the commonly used catalyst for this method is Cr-based catalyst. Specifically, Al2O3 or AlF3 or MgF2 and other Al sources and Mg sources are used as the carrier to support active components such as Cr or Cr2O3 catalysts with additives. [0003] At present, most of the catalyst preparation processes used for difluoromethane are gas-phase p...

AI Technical Summary

Problems solved by technology

When the gas phase method is used to prepare the catalyst for the production of difluoromethane, most of them are directly put into use after the preparation is completed, and the quality of the catalyst content is not tested, so the performance stability of the catalyst after being put into use cannot be guaranteed, which may lead to mediocre catalytic effect and may cause Fluoride to be catalyzed is wasted, which increases production costs and wastes resources, and is not suitable for large-scale industrial production of catalysts