Download e-book for kindle: Catalysis in application: [proceedings of the International by S.D. Jackson, J.S.J. Hargreaves, D. Lennon

By S.D. Jackson, J.S.J. Hargreaves, D. Lennon

ISBN-10: 0854046089

ISBN-13: 9780854046089

Catalysis in program offers a photograph of the main updated advancements within the box of utilized catalysis. assurance is mainly within the components of hydrogenation, dehydrogenation, chiral catalysis, environmental catalysis and catalyst deactivation, combining a special mixture of chemistry and chemical engineering.With its wide-ranging insurance, this booklet can be a great addition to the cabinets of each practitioner in catalysis, either in and academia.

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Yet, the aromatics yield only started to decrease in run 12. The change in feed may have accentuated these changes, but these changes were not caused by the change in feed. 30 Catalysis in Application It has already been noted that ZdZSM-5 catalysts have higher benzene selectivity than H/ZSM-5 catalysts and that the decrease in the benzene to C;r/Cg-aromatics ratio can be seen as indication of permanent metal site loss. The simultaneous decrease of the paraffin to olefin ratio is probably not a coincidence and lends further support to such an interpretation.

This was not the case and aromatic selectivity decreased with time on stream. Since aromatisation is primarily promoted by the metal sites and cracking conversion by the acid sites, these observations tend to indicate a preferential deactivation of the metal sites in agreement with the observations by Cumming and Woj~iechowski'~ for reforming catalysts. The decrease in paraffin to olefin ratio can partly be explained by noting that ZdZSM-5 is sensitive to the hydrogen partial pressure with respect to selectivity and c o n v e r s i ~ n .

Pittman and A. T. Bell, Catal. , 1994,24, 1. J. Miciukiewicz, T. Mang, and H. Knoezinger, Appl. , A , 1995, 122, 151. G. J. Hutchings, A. Desmartin-Chomel, R. Oller, and J. C. Volta, Nature (London), 1994,368,41. M. Scheithauer, H. Knozinger, and M. A. Vannice, J. , 1998, 178, 701. J. P. Dunn, H. G. , and I. E. Wachs, J. , 1999,181, 233. C. Li and P. C. Stair, Stud. Surf: Sci. , 1996, 101, 881. C. Li and P. C. Stair, Catal. , 1996,36, 119. C. Li and P. C. Stair, Stud. Surf: Sci. , 1997, 105A, 599.

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Catalysis in application: [proceedings of the International Symposium on Applied Catalysis to be held at the University of Glasgow on 16-18 July 2003] by S.D. Jackson, J.S.J. Hargreaves, D. Lennon


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