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Hydrogen production by reforming of acetic acid using La–Ni type perovskites partially substituted with Sm and Pr

Paper ID Volume ID Publish Year Pages File Format Full-Text
53821 46986 2015 9 PDF Available
Title
Hydrogen production by reforming of acetic acid using La–Ni type perovskites partially substituted with Sm and Pr
Abstract

•LaNiO3, LaPrNiO3 and LaSmNiO3 perovskites were tested as catalyst precursors for steam and oxidative reforming of acetic acid.•All samples presented good selectivity for hydrogen formation in both reactions.•The presence of O2 improved catalyst stability without reducing the amount of hydrogen produced.

The condensation of gases from the pyrolysis of biomass leads to a liquid compound called bio-oil. This oil can be divided into two fractions: one aqueous and another non-aqueous. The aqueous fraction does not have a high market value and it is usually discarded. However, this mixture has considerable amounts of organic compounds, which can be potential renewable sources of hydrogen. Steam reforming has been the most studied reaction to produce hydrogen from the aqueous fraction of bio-oil. Due to the diversity of organic compounds found in this aqueous fraction, model compounds have usually been used to study this mixture. Among the compounds used to represent the aqueous fraction of bio-oil, acetic acid is the most popular. Nickel-based catalysts are traditionally used for reforming reactions. An alternative to combine high Ni content employed in catalysts, this kind of process with desirable values of dispersion is to use perovskite-type precursors (LaNiO3). Therefore, the objective of this study was to investigate the production of hydrogen from the aqueous fraction of bio-oil. More specifically, in this work, LaNiO3, LaPrNiO3 and LaSmNiO3 were tested as precursors for catalysts in the reaction of steam and oxidative reforming of acetic acid. During the reaction, the catalysts showed the formation of the same products: H2, CO, CH4, CO2, C3H6O, but with different selectivities. All samples presented good selectivity for hydrogen formation, and the presence of Pr and Sm just slightly affected the catalytic performance. Due to the large accumulations of coke observed during the reaction of steam reforming, a small amount of O2 was added to the mixture. The presence of this oxidant improved catalytic activity without reducing the amount of hydrogen produced. Furthermore, it helped to reduce the deposits of coke, maintaining the catalytic activity during 24 h of reaction.

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Keywords
Bio-oil aqueous fraction; Perovskite; Nickel; Acetic acid and hydrogen
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Hydrogen production by reforming of acetic acid using La–Ni type perovskites partially substituted with Sm and Pr
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 242, Part A, 15 March 2015, Pages 71–79
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