Download e-book for kindle: Catalysis by Acids and Bases by B. Imelik

By B. Imelik

ISBN-10: 0080960545

ISBN-13: 9780080960548

ISBN-10: 0444424490

ISBN-13: 9780444424495

As a result of the nice value of acid catalysis within the petrochemical undefined, vast examine has been performed over the last 30 years about the primary and utilized features of catalysis by means of acids. by contrast, base-catalyzed reactions have acquired little consciousness in heterogeneous catalysis. the purpose of this symposium was once to judge our wisdom of the $64000 region of acid and base catalysis and to hide a huge variety of solids, zeolite chemistry being just one element of heterogeneous catalysis.

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Another possibility i s the participation of acidic centres In some side reactions of hydrocarbons, analogous to those observed on typical acidic catalysts, which invoke formation of carbocations and Lad to undesirabk for selective oxidation destruction processes. In spite of numerous works no general correlation between acid-basic properties and performance in oxidation reaction h a s been so f a r formulated. 5-5 m 1% in most cases) makes difflcult classical or s p e c t ral sorption measurements, hlgh reaction temperature 623 K) may change the state of easily reducible oxide systems ( with respect to that at which the acidity measurements are performed, > ( b ) the presence of reactive adsorbed oxygen which can react with acid or base probe molecules obscuring the real sorption processes, (c) participation of other but acldo-basic reaction in the rate determining step of the oxidation.

Faraday I, 80, (1984) 1239. Lercher, Ch. Colornbier and H. Chern. SOC. Faraday I , 80, 949. H. Vinek, Z. Chern. F. 120,(1980) 119. H. Pines and J. Advan. Catal. Relat. Subj. 16,(1966) 49. H. Knozinger, H. Buhl and K. , 24,(1972) 57. A. G, Pearson, Kinetics and Mechanism, John Wiley & Sons New York, 1961. 15 K. Tanabe and Y. Fukuda, React. Kinet. Catal. , 1,(1974) 21. 16 H. M. Res. Inst. Catal. ) 95. 17 H. Noller, Acta Chirn. Acad. Scient. , Tornus 109 (41, (1982) 429. 18 V. Gutrnann, The Donor-Acceptor Approach to Molecular Interactions, Plenum Press, New York 1978.

D. t h e enhancement o f t h e (220) l i n e o f alumina on heated samples seemed t o be i n agreement w i t h t h e l o c a t i o n o f potassium on t e t r a h e d r a l s i t e s a t t h e s u r f a c e o f alumina. However t h e study o f t h e decomposition p r o d u c t s o f KA1C03(0H)2 i n m i x t u r e w i t h alumina 42 shows an i m p o r t a n t s i g n a l due t o an amorphous phase m a i n l y i n t h e range 4 A 2 . For - h i g h K-content samples t h e c o n t r i b u t i o n o f t h e s e decomposition p r o d u c t s i s t h e main probable e x p l a n a t i o n t o t h e enhancement o f t h e (220) compared t o t h e o t h e r l i n e s .

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