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New insights on the role of YSZ in a NiAl2O4/Al2O3–YSZ catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
39273 45816 2015 9 PDF Available
Title
New insights on the role of YSZ in a NiAl2O4/Al2O3–YSZ catalyst
Abstract

•YSZ's surface area and charge has a direct influence on interaction metal/support.•Zr is incorporated only in cubic or defective spinel structures, such as γ-Al2O3 and NiAl2O4.•YSZ in the NiAl2O4/Al2O3 catalysts is instrumental in diesel catalytic reforming.•Y2O3 loading in YSZ influences catalyst's activity in diesel steam reforming.•Catalytic activity reaches its max at 7% (w/w) Y2O3 in YSZ; above this max activity decreases.

Yttria stabilized zirconia (YSZ) role as co-support in alumina (Al2O3) supported Al–Ni spinel (NiAl2O4) was investigated from three perspectives: (a) influence on catalyst morphology, (b) influence on catalyst crystalline phases, and (c) role during diesel steam reforming tests.For the first objective, YSZ surface properties were related to NiAl2O4/Al2O3 morphology. The interaction between these two species was examined using scanning electron microscopy (SEM); surface properties were determined using the multipoint Brunauer, Emmet, and Teller (BET) method for the specific surface area, and mass titration for the zero point charge (PZC) of the surface.The second objective demonstrated, mainly through X-ray diffraction (XRD) analysis, that YSZ enhanced the stabilization of a single Al2O3 phase and inhibited the formation of a metastable aluminates phase.Finally, for the third objective, Y2O3% used to stabilize ZrO2 was varied. Diesel steam reforming tests, using the various YSZ formulations were performed in a fixed-bed reactor setup, with a proprietary diesel–water emulsion mixture at 760 °C. It has been shown that there is a direct dependence of the catalytic activity on the support oxygen vacancies and a maximal Y2O3% was determined.

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Keywords
Catalyst; Heterogeneous; Catalysis; Spinel; Nickel; NiAl2O4; Al2O3; YSZ; Diesel; Steam reforming
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 497, May 2015, Pages 42–50
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
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us