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

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Energy & Environmental Science Vol - 3 Issue - 5

Energy & Environmental Science Vol - 3 Issue - 4

Energy & Environmental Science Vol - 3 Issue - 3

Energy & Environmental Science Vol - 3 Issue - 2

Energy & Environmental Science Vol -2

Energy & Environmental Science Vol -1

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

Content Provider	Royal Society of Chemistry (RSC)
Author	Si, Rui Yi, Nan Flytzani-Stephanopoulos, Maria Saltsburg, Howard
Copyright Year	2010
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.
Starting Page	831
Ending Page	837
Page Count	7
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	3
Issue Number	6
Journal	Energy & Environmental Science
DOI	10.1039/b924051a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SRM Cerium(IV) oxide Steam reforming Methanol Water gas Transmission electron microscopy Methyl formate
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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