Chemical Engineering

Advances in Catalysis, Vol. 31 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)

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By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)

Particular medical advantage and a wealth of knowledge make the publication super worthy, like different volumes within the series.(from preface)A major a part of the hassle in catalysis learn relies on an realizing extra whole wisdom of the character and behaviour of reactive intermediates or chemisorbed complexes will permit us to supply higher catalysts for commercial strategies. The aiding funds circulation is definitely in response to this assumption. This quantity of Advances in Catalysis provides completely written money owed of 4 assorted sectors of this attempt.

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In particular, a correlation was observed between the turnover number for benzene hydrogenation and the CO stretching frequency. The shift toward higher frequency with increasing support acidity was considered as evidence for increased electron acceptor properties of the support. Further studies will, however, be required to provide a more detailed understanding of this phenomenon. Other recent studies have included zeolites containing copper (106), nickel (107-110), rhodium (111, 112), rhenium (113), and ruthenium (114, 115).

Under milder conditions (20”C, 200 Torr ethylene) other workers (140) found PdY (also prepared via ion exchange with [Pd(NH,),]CI,) to be inactive for ethylene dimerization. In general, the active homogeneous palladium complexes contain a halide ion (133), typically chloride, in the coordination sphere. The influence of halide ions on the Pd zeolite catalysts would therefore seem worthy of study. d. Other Metal Zeolites. , NiY, RhY, PdY), Yashima et al. (140)also examined C r y , RuY, COY, Fey, MnY, CdY, and ZnY for catalytic activity under mild conditions (20”C, 200 Torr ethylene).

2. Other Metal Zeolites Nefedov et al. 5 wt. % metal) onto NaX. With the exception of rhodium none of these metal ions showed significant methanol carbonylation activity. B. ETHANOLAND HIGHER ALCOHOLS Carbonylation activity of ethanol using ethyl iodide as a promoter has been investigated using RhNaX as a catalyst (208,211). Some carbonylation activity does occur, with formation of ethyl propionate; however, ether and also olefin formation results in rather poor selectivities to the ester. The selectivity decreases with increasing ethanol conversion.

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