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Stable hydrogen production from ethanol through steam reforming reaction over nickel-containing smectite-derived catalyst.

Yoshida H, Yamaoka R, Arai M - Int J Mol Sci (2014)

Bottom Line: The former is initially active, but significant catalyst deactivation occurs during the reaction due to carbon deposition.Side reactions of the decomposition of CO and CH4 are the main reason for the catalyst deactivation, and these reactions can relatively be suppressed by the use of the Ni-containing smectite.The Ni-containing smectite-derived catalyst contains, after H2 reduction, stable and active Ni nanocrystallites, and as a result, it shows a stable and high catalytic performance for the steam reforming of ethanol, producing H2.

View Article: PubMed Central - PubMed

Affiliation: . yoshida@chem.kumamoto-u.ac.jp.

ABSTRACT
Hydrogen production through steam reforming of ethanol was investigated with conventional supported nickel catalysts and a Ni-containing smectite-derived catalyst. The former is initially active, but significant catalyst deactivation occurs during the reaction due to carbon deposition. Side reactions of the decomposition of CO and CH4 are the main reason for the catalyst deactivation, and these reactions can relatively be suppressed by the use of the Ni-containing smectite. The Ni-containing smectite-derived catalyst contains, after H2 reduction, stable and active Ni nanocrystallites, and as a result, it shows a stable and high catalytic performance for the steam reforming of ethanol, producing H2.

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Time profiles of total conversion (a) and H2 yield (b) over different Ni catalysts at 500 °C.
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ijms-16-00350-f006: Time profiles of total conversion (a) and H2 yield (b) over different Ni catalysts at 500 °C.

Mentions: Figure 6 gives the time profiles of the total conversion and H2 yield over SM(Ni35) and other Ni-loaded catalysts prepared by impregnation. For the Ni35/SM catalyst, remarkable catalyst deactivation was observed within a first 100 min, and the deactivation continued to occur gradually after 100 min. Such catalyst deactivation was not observed for Ni05/SM and Ni10/SM, which have small Ni nanoparticles, as shown in Table 1, implying that a rapid catalyst deactivation due to carbon deposition is unlikely to occur on a small Ni nanoparticle. For SM(Ni35), the formation of Ni nanoparticle in SM(Ni35) may be responsible for its relatively stable catalytic performance for both conversion and H2 yield during the reaction.


Stable hydrogen production from ethanol through steam reforming reaction over nickel-containing smectite-derived catalyst.

Yoshida H, Yamaoka R, Arai M - Int J Mol Sci (2014)

Time profiles of total conversion (a) and H2 yield (b) over different Ni catalysts at 500 °C.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4307250&req=5

ijms-16-00350-f006: Time profiles of total conversion (a) and H2 yield (b) over different Ni catalysts at 500 °C.
Mentions: Figure 6 gives the time profiles of the total conversion and H2 yield over SM(Ni35) and other Ni-loaded catalysts prepared by impregnation. For the Ni35/SM catalyst, remarkable catalyst deactivation was observed within a first 100 min, and the deactivation continued to occur gradually after 100 min. Such catalyst deactivation was not observed for Ni05/SM and Ni10/SM, which have small Ni nanoparticles, as shown in Table 1, implying that a rapid catalyst deactivation due to carbon deposition is unlikely to occur on a small Ni nanoparticle. For SM(Ni35), the formation of Ni nanoparticle in SM(Ni35) may be responsible for its relatively stable catalytic performance for both conversion and H2 yield during the reaction.

Bottom Line: The former is initially active, but significant catalyst deactivation occurs during the reaction due to carbon deposition.Side reactions of the decomposition of CO and CH4 are the main reason for the catalyst deactivation, and these reactions can relatively be suppressed by the use of the Ni-containing smectite.The Ni-containing smectite-derived catalyst contains, after H2 reduction, stable and active Ni nanocrystallites, and as a result, it shows a stable and high catalytic performance for the steam reforming of ethanol, producing H2.

View Article: PubMed Central - PubMed

Affiliation: . yoshida@chem.kumamoto-u.ac.jp.

ABSTRACT
Hydrogen production through steam reforming of ethanol was investigated with conventional supported nickel catalysts and a Ni-containing smectite-derived catalyst. The former is initially active, but significant catalyst deactivation occurs during the reaction due to carbon deposition. Side reactions of the decomposition of CO and CH4 are the main reason for the catalyst deactivation, and these reactions can relatively be suppressed by the use of the Ni-containing smectite. The Ni-containing smectite-derived catalyst contains, after H2 reduction, stable and active Ni nanocrystallites, and as a result, it shows a stable and high catalytic performance for the steam reforming of ethanol, producing H2.

Show MeSH