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Hydroconversion of n ‐heptane on platinum/H‐Mordenite catalysts prepared via different routes
Author(s) -
AboulGheit Ahmed K.,
Menoufy Mohammed F.,
ElMorsi Akila K.
Publication year - 1991
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280500208
Subject(s) - mordenite , catalysis , heptane , calcination , chemistry , activation energy , zeolite , thiele modulus , isomerization , propane , arrhenius equation , butane , arrhenius plot , inorganic chemistry , organic chemistry
Abstract Two Pt/H‐mordenite catalysts were prepared via different routes: (a) by impregnating H 2 PtCl 6 in H‐mordenite (HM) (catalyst 1) and (b) in NH 4 HM (catalyst II), followed by drying, calcination and reduction. Catalyst I was found (i) to be more active for n‐heptane hydroconversion, (ii) to be more selective for its isomerisation, (iii) to encounter more diffusion limitation as it yields a larger Thiele modulus, (iv) to give a lower effectiveness factor and (v) to give lower activation energy, E a , values than catalyst II. A study of the pressure effect between 1·5 and 5·5 MNm −2 showed an increase of the catalytic activities to a maximum at 3·0 MNm −2 , followed by a decrease. A compensation effect plot gave a linear relationship between In A (pre‐exponential factor in the Arrhenius equation) and E a at various pressures for n‐heptane hydroconversion and its hydrocracking. High selectivities for central hydrocracking of heptane components and high iso‐butane to n‐butane ratios were obtained on both catalysts.