Thus, the use of zeolites in the presence of CO2 permits an intensification of the catalytic processes, a change in their selectivity, and on the whole a more complete disclosure and utilization of the potentialities of types X and Y zeolites as catalysts.
The theoretical significance of the influence of CO2 on the catalytic properties of zeolites that we detected consists of the fact that it confirms the acid nature of the catalytic action of zeolites in the reactions studied, opens up the possibility for evaluating the contribution of cations of various types to the activity of polycationic modifications of faujasites, as was noted for NdCaY, as well as the creation of new catalytic systems.
As for the practical significance of the effect, it is determined primarily by the fact that in an atmosphere of CO2, many processes on types X and Y zeolites as catalysts proceed at higher rates and at lower temperatures (75–100°C lower), while the yields of the final products and the output of the catalysts increase by no less than 2–4-fold; in a number of cases their selectivity and stability are substantially increased. It is important that in this case high activity is manifested by samples in which only 60–70% of the Na+ ions are replaced by polyvalent metal cations (Ca2+, Co2+, Mg2+, Mn2+, etc.), which substantially simplifies the technology of preparation of the catalysts (reduction of the consumption of metal salts and elimination of the steps of intermediate heating  in ion exchange). Finally, CO2 does not break down the crystal structure of zeolites, and in this respect has substantial advantages over HCl, and HBr, also used as promoters [4, 12].
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 767–779, April, 1974.
The article is published according to a resolution of the Editorial Board of the Journal, from October 23, 1973.
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Minachev, K.M., Isakov, Y.I. Influence of CO2 on the catalytic properties of types X and Y zeolites. Russ Chem Bull 23, 736–746 (1974). https://doi.org/10.1007/BF00923492
- High Activity
- Metal Cation
- Catalytic Action
- Catalytic Property