THE EFFECT OF ALKALINE EARTH METAL ADDITIVES ON THE PROPERTIES OF CuO/ZnO/Al2O3 CATALYSTS

The paper investigates the effect of alkaline earth metal additives on the formation of the active phase and the physico-chemical properties of CuO/ZnO/Al2O3 catalysts. Based on a comprehensive analysis of properties performed using X-ray phase and X-ray diffraction analysis, as well as temperature adsorption-desorption of gases, the processes occurring at the stage of mechanochemical activation and further heat treatment were studied. It was found that the optimal amount of the promotional additive is 1-2% by weight. Alkaline earth metals play the role of a textural promoter and have a positive effect on strength properties. The introduction of this additive makes it possible to increase the strength by 15-20% compared with non-motorized catalysts. It is shown that the introduction of magnesium and calcium oxides into the catalyst composition is more than 2% by weight (in terms of metal) leads to a sharp decrease in the specific surface area of the catalyst, while maintaining the pore distribution characteristic of non-motorized and industrial samples. The content of additives leads to a broadening of the recovery peak profile and the formation of additional maxima on it, in addition, it was found that the method of obtaining samples also has a significant effect on reduction. For citation: Rumyantsev R.N., Smirnova A.A., Severgina E.S., Afineevsky A.V., Papulova E.L., Markelova T.A. The effect of alkaline earth metal additives on the properties of CuO/ZnO/Al2O3 catalysts. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 3. P. 76-85. DOI: 10.6060/ivkkt.20256803.7103.