NEW APPROACH TO ACID CATALYSIS AND HYDROCARBON ZEOLITE INTERACTIONS
IR@IIP: CSIR-Indian Institute of Petroleum, Dehradun
View Archive InfoField | Value | |
Creator |
Dixit,Lalji
Prasada,Rao |
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Date |
2009-07-15T11:10:12Z
2009-07-15T11:10:12Z 2009-07-15T11:10:12Z |
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Identifier |
Recent Advances in Basic and Applied Aspects of Industrial Catalysis Studies in Surface Science and Catalysis, Vol. 113
http://hdl.handle.net/123456789/345 |
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Description |
Adsorption of hydrocarbons on zeolites has been the subject of serious concern
owing to its important catalytic consequences in petroleum refining, cracking, fuel synthesis
and processing. Besides thermodynamic links between zeolites and hydrocarbons during
adsorption, diffusion, and cracking, the inclusion of framework and surface parameters, e.g.,
genus of periodic minimal surface and atomic connectivity, have been postulated in
establishing nonspecific type interactions. Keeping this in view, the earlier proposed model
that establishes the concept of atomic polarizabilities in zeolite science and acid catalysis
(Dixit and Rao, Zeolites, 16, 4, 287-293, 1996) has been extended to examine heats of
adsorption of paraffins, naphthenes, olefins and aromatics on the zeolite surfaces. The
formalism thus developed has been used to evaluate heats of adsorption and activation
energies of hydrocarbon species on the surfaces of faujasites, ZSM-5, mordenite and
silicalite by proposing a new relation that reads: L'1H= aM . ~.y + 9r; where aM is the average
polarizability, ~and 9r are the constants, and y the average curvature of the zeolite surface.
The agreement between theoretical and experimental values of heats of adsorptions of C1-
C20paraffins have been found to be very good in the case of ZSM-5 and relates well with
their activation energies for cracking.
Key words: Zeolites, Heats of adsorption, Activation Energies
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Language |
en_US
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Subject |
Heterogeneous Catalysis
Zeolites |
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Title |
NEW APPROACH TO ACID CATALYSIS AND HYDROCARBON ZEOLITE INTERACTIONS
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Type |
Article
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