By Charles N. Satterfield
Mass move in Heterogeneous Catalysis
Read Online or Download Mass Transfer in Heterogeneous Catalysis PDF
Similar chemical books
Chemical Mutagens: Environmental results on organic structures brings jointly correct proof approximately man made and of course taking place mutagenic chemical substances. geared up into components, this booklet starts off with an easy dialogue at the smooth techniques of the gene on the molecular and biochemical degrees. the 1st half additionally seems into the differing kinds of mutations and the way they shape, in addition to the organic structures used for his or her detection.
Mesoscale Modeling in Chemical Engineering, a quantity within the Advances in Chemical Engineering sequence presents the reader with own perspectives of professionals within the box. topics coated should not constrained to the classical chemical engineering disciplines, with contributions connecting chemical engineering to comparable medical fields, therefore supplying new principles for added concept.
- The Alkaloids: A Review of Chemical Literature: v. 6 (Specialist Periodical Reports)
- Chemical Warfare Secrets Almost Forgotten: A Personal Story of Medical Testing of Army Volunteers
- The UNSCOM Saga: Chemical and Biological Weapons Non-Proliferation
- Chemical Waste: Handling and Treatment
- Chemical Engineering [Coulson and Richardson's] (Solutions Manual - Vol 2, 3)
Additional info for Mass Transfer in Heterogeneous Catalysis
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  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.