Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-I-26coefficients of the equation (3). Uniqueness of this stationary state is provided with positivityof last coefficient σ 4 . In work [4] it is established that for the reactions of a kind (1) consistingof any number of intermediate substances and bimolecular and linear stages on intermediatesubstances coefficient σ 1 of the characteristic equation cannot be negative. Thus instability ofthe reactions proceeding under five-stage schemes will mean negativity of one of coefficientsσ 2 or σ 3 a characteristic multinominal (3).With application of these conditions in language Maple the program of the analysis ofself-oscillations has been developed. With its help the mechanisms describing self-oscillatoryregimes have been selected from set of the generated five-stage schemes. Generation of allpossible five-stage schemes was carried out by program specially developed by us inlanguage Delphi. The received schemes have been grouped on number of stages included inthem various molecularity: schemes containing 3 linear and 2 bimolecular stages and schemesconsisting from 2 linear and 3 bimolecular stages.The examples of the elementary schemes describing self-oscillations in reactions ofcatalytic oxidation СО and Н 2 are below resulted1. CO + O 2 + 2K ↔ KO + KCO 2 ,2. O 2 + KCO 2 ↔ KO 2 + CO 2 ,3. CO + KO 2 ↔ KO + CO 2 ,4. CO + KCO 2 → KCO + CO 2 ,5. KO + KCO ↔ KCO 2 + K;1. H 2 + 2K ↔ 2KH,2. O 2 + K ↔ KO 2 ,3. H 2 + KO 2 ↔ KO + H 2 O,4. O 2 + H 2 + KH ↔ KOH + H 2 O,5. KO + KOH ↔ 2K + H 2 O;1. H 2 + 2K ↔ 2KH,2. O 2 + K ↔ KO 2 ,3. H 2 + KO 2 ↔ KO + H 2 O,4. KO + KH ↔ KOH + K,5. KO + KOH ↔ 2K + H 2 O.Thus we computerize process of construction of the five-stage schemes describing selfoscillationsin kinetics of catalytic reactions. The examples confirming applicability ofsimplest received schemes for reproduction of self-oscillations in reactions of catalyticoxidation of carbon monoxide and hydrogen are considered.References1. Fedotov V.Kh., Alexeev B.V., Koltsov N.I., Kiperman S.L. News of High Schools. Chemistry and Chem.Technology. 1985. V.28. № 5. P. 66-68.2. Alexeev B.V., Fedotov V.Kh., Koltsov N.I. Reports of Rus. Acad. Sci. 1994. V. 337. № 6. P. 761-764.3. Koltsov N.I., Fedotov V.Kh., Alexeev B.V. Kinetics and Catalysis. 1995. V.36. №1. P. 51-59.4. Alexeev B.V., Fedotov V.Kh., Koltsov N.I. Reports of Rus. Acad. Sci. 1989. V. 306. № 4. P. 884-888.258