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Heterogeneous Catalysis and Fine Chemicals II: Proceedings by M. Guisnet, J. Barrault, C. Bouchoule, D. Duprez

By M. Guisnet, J. Barrault, C. Bouchoule, D. Duprez

The recession within the conventional heavy industries besides the improvement of complex applied sciences in the entire commercial nations has intended that the impression of heterogeneous catalysis within the synthesis of excellent chemical compounds is turning into more and more seen. the second one overseas Symposium on Heterogeneous Catalysis and wonderful chemical substances is to be obvious during this standpoint. Organised by means of the Laboratory of Catalysis in natural Chemistry of the college of Poitiers in the framework of the foreign Symposia of the `Centre nationwide de los angeles Recherche Scientifique' (CNRS), the symposium supplied a chance for touch among educational researchers and brands, clients (or capability clients) of good catalysts for fantastic chemical synthesis. The publication offers an total view of the issues encountered by means of educational and commercial researchers. a wide number of reactions are defined, the emphasis being on selectivity: chemo-, regio-, stereoselectivity (even enantioselectivity) and at the switch of those selectivities as a functionality of the features of the outside websites (nature, distribution, etc.).The 3 topics of the symposium, hydrogenation, oxidation and acid-base catalysis have been brought in 4 plenary lectures and invited communications, retaining a stability among the commercial and the educational issues of view. a few 60 learn papers chosen by means of the clinical Committee have been awarded. All are reproduced in complete during this court cases quantity.

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D1 molecular diffusivity (from first Fick law) is a function of L viscosity and temperature. Adapting the Stockes-Einstein law to real media led to WilkeChang correlation [51], among others : 1 D1 p . - = f (physical L parameters) T Direct D1 measuring remains more accurate, but expensive : we used Taylor's method [52] (pulse injections in capillary column). The rheological properties of L exert a huge influence on kl and hence must be apprehended in the model. A s a striking example, we discovered that adding a catalyst promotor made the L behavior change from ideal (Newtonian) to pseudo-plastic : viscosity p , very high at the beginning of the stirring, only goes down with increasing shear.

Jap. L. Kiperman, chapter 1 in ref. R. Westerterp, Ind. Sci. J. Madon and M. Fund. W. ) Catalysis in Organic reactions, Dekker, New york, 1990, p. Breysse, RhBne Poulenc Industrialisation, private communication This Page Intentionally Left Blank M. Guisnet et al. , Amsterdam Chemicals I1 STRUCTURE-REACTIVITY IN THE HYDROGENATION OF ALKENES. COMPARISONS WITH REDUCTIONS BY DIIMIDE AND THE FORMATION OF A Ni(0) COMPLEX S . SIEGEL Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas, 72701 (USA) ABSTRACT The effect of structure on the rates of hydrogenations catalyzed by Pt, Pd, and Ni is compared with the effects upon the rates of reduction by diimide (diazene) (Garbisch) and the association constants with a Ni(0) complex (Tolman).

G. g. i n the production of t e r e p h t h a l i c a c i d , b e n z o i c a c i d , a c e t i c a c i d , phenol and p r o p y l e n e o x i d e . I n t h e f i n e c h e m i c a l s i n d u s t r y t h e r e i s a l s o c u r r e n t l y much i n t e r e s t i n t h e use o f c a t a l y t i c o x i d a t i o n a s an e n v i r o n m e n t a l l y more a c c e p t a b l e a l t e r n a t i v e f o r o x i d a t i o n s e m p l o y i n g c l a s s i c a l s t o i c h i o m e t r i c o x i d a n t s such a s p e r m a n g a n a t e and d i c h r o m a t e .

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