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Ethene oligomerization on Ni-SiO2-Al2O3: Experimental investigation and Single-Event MicroKinetic modeling

Paper ID Volume ID Publish Year Pages File Format Full-Text
39422 45822 2015 13 PDF Available
Title
Ethene oligomerization on Ni-SiO2-Al2O3: Experimental investigation and Single-Event MicroKinetic modeling
Abstract

•Ethene oligomerization is adequately modeled using Single-Event MicroKinetics.•Anderson Schulz Flory product distribution independent of reaction conditions.•Nickel-ethene species identified as the actual active site in ethene oligomerization.

An experimental investigation of the intrinsic ethene oligomerization kinetics on an amorphous 1.8 wt.% Ni-SiO2-Al2O3 was performed. The temperature ranged from 443 to 503 K, the total pressure from 1.5 to 3.5 MPa, the inlet ethene partial pressure from 0.15 to 0.35 MPa and the space time was between 4.8 and 14.4 kgcat s molC2−1. Due to the absence of strong acid sites, the catalytic activity toward oligomerization originated solely from the nickel ion sites at the investigated conditions and resulted in an Anderson Schulz Flory product distribution. The oligomerization rate amounted from 0.007 to 0.027 mol s−1 kgcat−1 with butene selectivities of 80–90%. A Single-Event MicroKinetic (SEMK) model for ethene oligomerization, based upon an insertion-termination mechanism, was constructed. The kinetic parameter estimates were all statistically significant with a precise physical meaning. The model was found to be globally significant and adequate, that is, it was able to describe all experimental data without any systematic deviation. Using the model, it was determined that mainly ethene, because of its abundance, and octene, because of its higher carbon number, were physisorbed. The corresponding catalyst occupancy by physisorbed species typically ranged between 10% and 50%. Coordination of the alkenes at the active nickel ions resulted in about 90% of these ions being present under the form of a nickel-ethene species.

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Keywords
Ethene oligomerization; Heterogeneous catalyst; Single-Event MicroKinetic modeling
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Ethene oligomerization on Ni-SiO2-Al2O3: Experimental investigation and Single-Event MicroKinetic modeling
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 489, January 2015, Pages 292–304
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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