Dehydration of methanol to light olefins upon zeolite/alumina catalysts: Effect of reaction conditions, catalyst support and zeolite modification

•The reaction of methanol to propene was studied over ZSM-5 zeolite catalyst.•Olefin production was favoured by high temperature up to 400°C.•Low pressure of 1bar led to highest propene selectivity.•ZSM-5 zeolite impregnated with Cs led to the highest selectivity to propene.•The selectivity was clos...

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Bibliographic Details
Published in:Chemical engineering research & design 2015-01, Vol.93, p.541-553
Main Authors: Hajimirzaee, Saeed, Ainte, Mohammed, Soltani, Behdad, Behbahani, Reza Mosayyebi, Leeke, Gary A., Wood, Joseph
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysis
Catalysts
Conversion
Ion exchangers
Methanol to propene
Methyl alcohol
Modification
MTP
Olefins
Selectivity
Support
Wet impregnation
Zeolites
ZSM-5
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Summary:•The reaction of methanol to propene was studied over ZSM-5 zeolite catalyst.•Olefin production was favoured by high temperature up to 400°C.•Low pressure of 1bar led to highest propene selectivity.•ZSM-5 zeolite impregnated with Cs led to the highest selectivity to propene.•The selectivity was closely related to the acid site distribution of the catalyst. The reaction of methanol to propene was studied in a fixed bed reactor using a pelleted zeolite in alumina matrix support catalyst. The effect of reaction conditions (temperature, pressure, space velocity, feed composition), as well as the effect of support to ZSM-5 zeolite ratio on the conversion of methanol to light olefins (C2–C4) was studied. The best catalyst and optimum reaction conditions leading to a maximum yield of C2–C4 were determined. Use of γ-alumina as support improved the catalyst selectivity to propene and light olefins. Zeolite/alumina catalyst with 25wt.% ZSM-5 dispersed in a matrix containing 75% alumina led to highest selectivity to propene and light olefins. ZSM-5 zeolite was modified with phosphorus, Cs, Ca and Fe. The effect of their impregnation on the conversion of methanol and selectivity to light olefins was studied. Modification in all cases increased the shape-selectivity to light olefins. ZSM-5 zeolite ion exchanged by Cs led to highest selectivity to light olefins and particularly propene by changing the acid sites distribution.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2014.05.011