CATEGORY: OCTANE
Fuel
processing technology 2012, vol. 104, pp. 128-135 [8 page(s) (article)] (37
ref.)
Composite catalysts
of Pt/SO2―4―ZrO2 and Pt/WO3―ZrO2
for producing high octane isomerizate by isomerization-cracking of long
paraffins
Busto
M.; Dosso L. A.; Vera C. R.; Grau J. M.
Instituto de Investigaciones en Catálisis y Petroquímica―INCAPE-(FIQ-UNL,
CONICET), Santiago del Estero 2654, 3000 Santa Fe, ARGENTINE
Abstract
Isomerization-cracking of
long paraffins to produce octane enhancers for the gasoline pool is a complex
refinery operation that needs simultaneous adjustment of the molecular size of
the feed and skeletal branching. Since both reactions are acid-catalyzed,
adjusting the acidity distribution of a single catalyst to have a proper
balance is a challenge.
Authors report use of a
catalyst which is a mixture of an isomerization catalyst (Pt/WO3―ZrO2)
(PtWZ) and a cracking catalyst (Pt/SO2―4―ZrO2)
(PtSZ), working at the same reaction conditions. The tests were performed using
n-hexadecane as a model feedstock. The screening of pressure and temperature
conditions indicates that the best match for both catalysts is 20 atm and 225
°C. Stable activity levels for both catalysts can only be achieved at a H2/n-C16
ratio of 10. An adequate space velocity for increasing the yield to iC5―9
and preventing consecutive cracking is 18.4 h―1.
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