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

OP-I-12honeycomb monolith matrices [3,4]. The simulation was fulfilled for all range of temperaturesand gas velocities given above. The analysis of inter-phase mass transfer influence on thereaction rate in this structured reactor was performed on the base of a one-dimensional modelwith evaluated mass transfer correlations and the restrictions on the catalyst activity forstudied operation conditions were defined, while the reaction occurs in the chemical orchemical-diffusion- controlled regime.POM reactionA number of experimental runs with variation of contact time, temperature and feedcomposition was fulfilled to study the dependence of the reagent (CH 4 and O 2 ) and product(H 2 , CO, CO 2 ) concentrations on the operation conditions. In all cases, the rise of temperatureand/or contact time leads to the increase of product selectivity. At high temperatures, whenoxygen is absent in the gas phase, such impact reveals the importance of indirect pathway ofmethane oxidation as well as the rise of CH 4 conversion and CO selectivity indicates themethane transformation through reforming reactions following the deep oxidation. At contacttime of 4.7 ms and temperatures below 750 °С, syngas is formed in the presence of oxygen. Itcould be supposed that the syngas generation can proceed by the direct selective oxidation ofmethane.The data were processed to estimate the rates and its kinetic parameters of the mainindependent reaction pathways on the catalyst developed. The experimental points for dataprocessing were selected with minimal influence of mass transfer according to the analysisgiven above as well as with minimal temperature gradients. The kinetic characteristics of deepmethane oxidation as well as steam and dry reforming were determined, and the contributionof the direct route of partial oxidation of methane was evaluated.Thus, the studies performed show that the suggested construction of the small scalereactor with separate structured element of a real catalyst is promising for the kinetic studiesunder severe conditions. This reactor can be used also as effective tool to predict thecharacteristics of catalyst behavior for real industrial conditions.References1. G. Groppi, W. Ibashi, E. Tronconi, P. Forzatti, CEJ, 82 (2001) 57-71.2. S. Pavlova, N. Sazonova, V. Sadykov, S. Pokrovskaya, V. Kuzmin, G. Alikina, A. Lukashevich,E. Gubanova, Catalysis Today, 105 (2005) 367-371.3. R.D. Hawthorn, AIChE Symp. Ser. 70 (137) (1974) 428-438.4. E. Tronconi, P. Forzatti, AIChE J. 38 (1992) 201-210.49