Download Mass Transfer in Heterogeneous Catalysis by Charles N. Satterfield PDF

By Charles N. Satterfield

Mass move in Heterogeneous Catalysis

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7. I Diffusion in Fine Pores Knudsen Diffusion If the is low, or if the p ores are q uite small, or both, the collide with the pore wall much more frequently than w i t h each o ther. " The molecules hitting the wall are momentarily adsorbed and then g i ve n off in random directio ns (diffusively reflected). The gas flux is reduced b y the wall " resistance " which causes a delay because of both the dif­ fuse reflection and the finite time the molecule is adsorbed. Knudsen diffusion is n o t observed in liquids.

5 and Table 1 . 6 gather together d a t a reported on bulk diffusion in c a fa ly s t p e l le t s under a v ar i e t y of c ond i t io n s . Amberg and Echigoya [5] studied catalyst pellets prepared by pressing to various den s i t i e s po wd e rs of various sizes of a si l ve r alloy c ont ai ning 8 . 5 per cent calci um and the same material after " activation " in which most of the calcium w a s removed by ste am and acid treatment. (A catal yst of this co mp o s it i o n is reportedly used for the c o mme rc ia l oxidation of ethylene to ethylene o x i d e.

23 for the es timation of D1 2 in aqueous systems is about I 0- I 5 per cent ; considerably greater errors are commo n i n t he case of and all organic solvents. 23 is not dimensional l y consistent ; the variables with the must be employed. Furthermore , Equation 1 . 23 does not hold for the diffusion of large molecules, for which the Stokes-Einstein specified units equation gives D12 Values of D1 2 c alc u l at e d used by = 1 . s 1 . 23 should not Equation 1 . 24 , i. e. 27 Diffusion Coefficient i n a Liquid System Esti ma te D 1 2 for thi o p h ene in dilute solution in hexane at 4 0 °C.

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