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Issue 6, 2010
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Active gold species on cerium oxide nanoshapes for methanol steam reforming and the water gas shift reactions

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Abstract

We report that a small amount (<1 at%) of gold on ceria single crystals prepared as nanorods (10 ± 2.8 by 50–200 nm) of {110} and {100} crystal surfaces shows excellent catalytic activity in both the steam reforming of methanol (SRM) and the water gas shift (WGS) reactions at low temperatures (<250 °C). The ceria nanorods bind and stabilize gold as atoms and clusters (<1 nm, TEM invisible). On the other hand, gold nanoparticles (∼3 nm) are found on the {100} surfaces of ceria nanocubes. Very low rates of SRM and WGS were measured on the Au–ceria {100} cubes, while the rates on Au–ceria {110} rods were at least an order of magnitude higher. However, the apparent activation energies did not depend on the shape of ceria. Strong bonded Aun–O–Ce species are the active sites and these are present only in negligible concentrations on the {100} surfaces. Thus, both reactions are structure-insensitive on Au–ceria. SRM proceeds through the methyl formate route. The Au–ceria {110} catalyst shows both high SRM activity and high selectivity to CO2 at temperatures below 250 °C.

Graphical abstract: Active gold species on cerium oxide nanoshapes for methanol steam reforming and the water gas shift reactions

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Publication details

The article was received on 16 Nov 2009, accepted on 13 Apr 2010 and first published on 13 May 2010


Article type: Paper
DOI: 10.1039/B924051A
Citation: Energy Environ. Sci., 2010,3, 831-837
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    Active gold species on cerium oxide nanoshapes for methanol steam reforming and the water gas shift reactions

    N. Yi, R. Si, H. Saltsburg and M. Flytzani-Stephanopoulos, Energy Environ. Sci., 2010, 3, 831
    DOI: 10.1039/B924051A

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