Support effect for nanosized Au catalysts in hydrogen production from formic acid decomposition

Catalysts with about 2.5 wt% of gold supported on Al 2 O 3 , ZrO 2 , CeO 2 , La 2 O 3 and MgO oxides and with the same mean metal particle sizes of 2.4-3.0 nm have been studied in hydrogen production via formic acid decomposition. A strong volcano-type relation of the catalytic activity on the elect...

Full description

Saved in:
Bibliographic Details
Published in:Catalysis science & technology 2016-01, Vol.6 (18), p.6853-686
Main Authors: Zacharska, Monika, Chuvilin, Andrey L, Kriventsov, Vladimir V, Beloshapkin, Sergey, Estrada, Miguel, Simakov, Andrey, Bulushev, Dmitri A
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysis
Catalysts
Cations
Decomposition
Formic acid
Gold
Hydrogen production
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Catalysts with about 2.5 wt% of gold supported on Al 2 O 3 , ZrO 2 , CeO 2 , La 2 O 3 and MgO oxides and with the same mean metal particle sizes of 2.4-3.0 nm have been studied in hydrogen production via formic acid decomposition. A strong volcano-type relation of the catalytic activity on the electronegativity of the support's cation was demonstrated with the Au/Al 2 O 3 catalyst on the top. This indicated that the activity is affected by the acid-base properties of the support. A study of the most active Au/Al 2 O 3 catalyst with aberration-corrected HAADF/STEM, XPS and EXAFS proved that gold is in metallic state. The content of single supported gold atoms/cations was negligible. Therefore, the mechanism of the reaction was related to the activation of formic acid on the catalyst's support followed by further decomposition of the formed reaction intermediate on the Au/support interface. Au catalysts with the same particle sizes demonstrate the following order of activity in formic acid decomposition: Au/Al 2 O 3 > Au/ZrO 2 ∼ Au/CeO 2 > Au/La 2 O 3 > Au/MgO.
ISSN:2044-4753
2044-4761
DOI:10.1039/c6cy00552g