Hydrocracking Of C-10 Hydrocarbons Over A Sulfided Nimo/Y Zeolite Catalyst.
STUDIES IN SURFACE SCIENCE AND CATALYSIS(1997)
摘要
The transformation of different C-10 model molecules (n-decane, n-butyl cyclohexane, t-butyl cyclohexane, n-butyl benzene and tetralin) was studied on a sulfided NiMo/Y zeolite catalyst under industrial conditions : 380 degrees C, 5.7 MPa hydrogen pressure, presence of hydrogen sulfide and ammonia. Depending on the molecule, different reactions were observed, catalyzed either by the acid sites, or by the hydrogenating sites, or by both sites (bifunctional mechanism). Isomerization could concern the chain or the cycle, and occurred always through a bifunctional mechanism. The formation of the light products was mainly consecutive to isomerization, and consequently occurred also through the bifUnctional mechanism. However, some light products were formed through condensation-cracking reactions. Purely acid-catalyzed dealkylation of the alkyl aromatics was also observed, whereas the hydro-dehydrogenating function of the catalyst was responsible for the hydrogenation of the aromatics and the aromatization of the naphthenes.
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