0000000000955461
AUTHOR
Przemysław J. Jodłowski
Topography and morphology of multicomponent catalytic materials based on Co, Ce and Pd oxides deposited on metallic structured carriers studied by AFM/Raman interlaced microscopes
A system of interfaced AFM and Raman microscopes was used to study heterogeneity of complex cat- alytic materials providing information on both the topography and the chemical composition of the surface in one measurement. The catalysts surface was examined at various stages of their preparation: precalcination of steel, washcoating, impregnation and doping. It has been shown that the surface of the precalcined steel sheets is covered mostly by -Al 2 O 3 although there are places where -Fe 2 O 3 and Fe 3 O 4 are also present. Washcoating of the precalcined sheets gives only partly uniform grain distribution of CeO 2 . Impregnation with cobalt leads to formation of uniform coverage of Co 3 O…
Heat transfer and flow resistance for stacked wire gauzes: Experiments and modelling
Abstract The study deals with the flow resistance and heat transport properties of woven and knitted wire gauzes stacked in a tubular apparatus. The experimental programme included flow resistance and heat transfer experiments performed for air flow ( Re = 2–300) using three woven gauzes and one knitted gauze. During the heat transfer experiments, the gauzes were heated by electric current flowing directly through them. The models describing the flow resistance and the heat transfer were put forward. Both the models base on the concept of the laminar flow developing in a short capillary channel (i.e. the gauze mesh). The model describing the flow resistance does not contain the experimenta…