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n-Dodecane reforming over nickel-based monolith catalysts: Deactivation and carbon deposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
43217 45958 2008 14 PDF Available
Title
n-Dodecane reforming over nickel-based monolith catalysts: Deactivation and carbon deposition
Abstract

The carbon deposition behavior of Ni-based monolith reforming catalysts was studied during n-dodecane autothermal reforming, partial oxidation, and steam reforming. One catalyst formulation was nickel deposited on cerium zirconium oxide (CZO) coated monolith, while the second formulation was nickel directly deposited on bare monolith. In both formulations, a series of catalysts with a range of nickel loadings (0–16 wt.%) were prepared to examine the influence of nickel loading on carbon deposition and to elucidate the benefits of the reducible oxide support CZO on carbon deposition. Carbon deposition was generally more pronounced at higher nickel loadings and on catalysts lacking CZO. Nickel supported on bare monolith suffered from excessive carbon deposition and carbon-induced monolith disintegration. The morphologies of carbon were determined by scanning electron microscopy (SEM). Temperature programmed oxidation (TPO) indicated the presence of two types of carbon. The low-temperature TPO peak can be attributed to coating carbon, while the high-temperature peak corresponds to filamentous carbon structures, including large whiskers and smaller filaments. Accumulation of whisker carbon had a deleterious effect on the monolith substrate resulting in the physical destruction of some samples. X-ray diffraction (XRD) gave no evidence for the presence of graphite or carbide species in carbon-deposited catalysts. The experimental results of this study are used to diagnose the causes for nickel catalyst deactivation during autothermal reforming and for proposing strategies to mitigate the deactivation.

Graphical abstractDeactivation of Ni-based monolith reforming catalysts from carbon deposition was studied during autothermal reforming, partial oxidation, and steam reforming of n-dodecane. The influence of Ni loading, Ni particle size, and support material on carbon formation is determined and strategies to minimize carbon deposition are proposed. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Dodecane; Carbon; ATR; Nickel; Monolith; Ceria; TPO; TGA; SEM; Jet fuel
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n-Dodecane reforming over nickel-based monolith catalysts: Deactivation and carbon deposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 334, Issues 1–2, 1 January 2008, Pages 277–290
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