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Kinetics modelling of 2‐butene metathesis over tungsten oxide containing mesoporous silica catalyst
Author(s) -
Bhuiyan Tazul I.,
Arudra Palani,
Hossain Mohammad M.,
Akhtar Mohammad N.,
Aitani Abdullah M.,
Abudawoud Raed H.,
AlKhattaf Sulaiman S.
Publication year - 2014
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21976
Subject(s) - metathesis , isomerization , salt metathesis reaction , butene , catalysis , chemistry , mesoporous silica , 1 butene , ring opening metathesis polymerisation , 2 butene , mesoporous material , photochemistry , organic chemistry , polymerization , ethylene , polymer
This article reports the activity, reaction mechanism and reaction kinetics of 2‐butene metathesis over tungsten oxide containing mesoporous silica (SBA‐15) catalyst. Physicochemical characterisation of the catalyst indicates that the dispersion and nature of tungsten oxide species on the catalyst are mainly responsible for the metathesis activity. The ample availability of Brønsted acid sites created by tetrahedrally co‐ordinated tungsten species also enhances the metathesis reaction. The product analysis indicates that lower temperature favours the butene isomerisation, while higher temperature is required for metathesis. The high temperature is also responsible for cracking reactions. A kinetics model is developed based on the experimental observations and the possible reactions including isomerisation, metathesis and cracking. The model parameters are estimated by fitting the experimental data implemented in MATLAB. The estimated apparent activation energy of 2‐butene isomerisation reaction was found to be the lowest (39.4 kJ/mol) among the competing reactions. The activation energy of cross metathesis of 2‐butene and 1‐butene, self‐metathesis of 1‐butene and 2‐butene cracking are 71.3, 176.9 and 73.1 kJ/mol, respectively. These results are consistent to the product selectivity and the proposed reaction scheme, which suggests that the isomerisation of 2‐butene gives 1‐butene and it further reacts (cross metathesis) with 2‐butene to produce propylene.