Diffusive Spreading in Nature, Technology and Society by Armin Bunde Jürgen Caro Jörg Kärger & Gero Vogl

Author:Armin Bunde, Jürgen Caro, Jörg Kärger & Gero Vogl
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(1)Reactants are transported into catalyst pellets from the bulk phase by overcoming external film mass transfer resistance, and subsequently diffuse into the macropore (>50 nm diameter) and mesopore (2–50 nm) network, where molecular diffusion and Knudsen diffusion dominate. In, for example, the case of zeolites, molecules further diffuse into the micropore network (pores < 2 nm diameter), where surface diffusion and configurational diffusion become dominant. Simultaneously, molecules adsorb and react on active sites on the pore walls. Products desorbed from the active sites are transported out of the catalyst pellets in the opposite direction. Intrinsically fast reactions may lead to transport limitations, meaning that the resistance to molecular transport dominates the overall rate of the combined process.

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