III International Conference

PP-III-78calculating kinetics of particles oxidation in the case when process of particles oxidation dueto a contact and remote operation does not submit to the linear law. Thus the aspect ofdependences of kinetic constants from time, obtained, for example, experimentally can beincluded for calculations.The data received as a result of modeling show time dependence of a mass loss of carbonparticles for particles with the given initial dimensions. The solution of the received equationsin program package Maple 9, allows determining the time of a full combustion of particles(fig.). The comparison of calculated and experimental data on oxidation of carbon on catalystbased on lanthanum - cesium vanadate showed their good correlation. During experiments,the gravimetrical method and microscopic observations of a change of carbonaceous subjectform were also used.Fig. Calculation curves of a mass loss(Δm/m 0 ) at catalytic oxidation of quasicylindricalparticles of carbon on a surface of thecatalyst (t - time in second). The radius andheight of particles are 1 micron; kinetic constantsH and C are equal to 0.033 microns/second.It is shown; that Cs x La 1-x VO 4 promotedCs 2 SO 4 has high activity at oxidation of soot. However, this activity for CO oxidation at lowtemperatures is concerning low in comparison with perovskites M x La 1-x MnO 3 . The hypothesisthat vanadate at low temperatures accelerates mainly the first stage of oxidation of carbon upto CO is confirmed. The kinetics of oxidation on air at presence Cs x La 1-x VO 4 of soot samplesis investigated. It is established, that process of oxidation at small degrees of fractionalconversion proceeds in a kinetic mode. The kinetics is described by the equation of thecompressed cylinder. Then there are diffusive difficulties, burning of soot is well describedmathematically by Yander equation. It is concerned with accumulation on a catalyst surfaceof the unburnt inorganic compounds.Besides it is immediately shown promoter action on covering catalysts M x La 1-x MnO 3 ofunderlying phases Al 2 O 3 and MnAl 2 O 4 at catalytic CO oxidation. Phase MnAl 2 O 4 arises atinteraction of perovskit with Al 2 O 3 . Measurements carried out by means of a reactor offlowing-circulating type Katakon 1.1 and electronic gas analyzer Testo-350 XL.617