Nano-scale aspects in studying the kinetics of reactions over zeolite catalysts

摘要

Notwithstanding the significant interest in the performance of reactions over zeolite-type catalysts, few are the kinetic studies of these processes. The scarcity of kinetic models of reactions over this large group of catalysts is usually ascribed to the masking effect of diffusion restrictions resulting from the narrowness of the zeolite channels. In the present work, the authors focus on a more large and knotty complex of reasons. The nano-scale sizes of the zeolite pores predetermine significant specificities in the nature of the key phenomena responsible for the catalytic performance. A variety of problems associated with the mechanism of the processes are still questioned. In this connection, the present work is aimed to associate some of the problems for modeling the reaction kinetics on this type of catalysts, with effects originating from their nano-sized structure. The authors aim to bring the attention to some problems associated with the methodology of constructing the kinetic description of reactions over zeolite-type catalysts. The emphasis is focused on the diversities in the nature of the phenomena occurring inside the zeolite channels and the surface elementary steps characterizing the performance over supported catalysts.