NiAl2O4 spinel-type catalysts for deoxygenation of palm oil to green diesel

[Display omitted] •NiAl2O4 spinels have been developed for deoxygenations of palm oil to green diesel.•XRD and XANES analyses confirmed the formation of metallic Ni after pre-reduction.•NiAl2O4 catalyst reduced at 923 K exhibited the highest product yield (>94%).•The decarbonylation and/or decarb...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2018-08, Vol.345, p.107-113
Main Authors: Srifa, Atthapon, Kaewmeesri, Rungnapa, Fang, Cheng, Itthibenchapong, Vorranutch, Faungnawakij, Kajornsak
Format: Article
Language:English
Subjects:
Bio-hydrogenated diesel
Deoxygenation
Green diesel
NiAl2O4 spinel catalyst
Palm oil
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Summary:[Display omitted] •NiAl2O4 spinels have been developed for deoxygenations of palm oil to green diesel.•XRD and XANES analyses confirmed the formation of metallic Ni after pre-reduction.•NiAl2O4 catalyst reduced at 923 K exhibited the highest product yield (>94%).•The decarbonylation and/or decarboxylation were dominant reaction pathways. NiAl2O4 spinel-type catalyst was successfully prepared by an incipient wetness impregnation method accompanied with high-temperature calcination at 1273 K for 10 h. The effect of reduction temperatures (773, 923, and 1073 K) on the catalytic activity for palm oil deoxygenations to green diesel was investigated at 573 K and 5 MPa in a trickle bed reactor. The XRD and XANES analyses confirmed the formation of metallic Ni after pre-reduction, which exhibited a variation of reduction degree at different temperatures. The TEM analysis revealed the formation of large particle size of the catalysts reduced at higher temperature. The highest product yield (94.3%) was achieved for the NiAl2O4 reduced at 923 K. Interestingly, the spinel-type catalyst was highly stable for 24 h on-stream, while the fast degradation was found over a reference catalyst, Ni supported on γ-Al2O3. The decarbonylation and/or decarboxylation (DCO/DCO2) reactions were dominant over the hydrodeoxygenation (HDO) pathway over all the catalysts. The high performance of NiAl2O4 spinel-type catalyst could be attributed to the characteristic feature of the well-dispersed metallic Ni species with highly stable spinel structure.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2018.03.118