PMID- 21240451 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20110609 LR - 20110203 IS - 1463-9084 (Electronic) IS - 1463-9076 (Linking) VI - 13 IP - 7 DP - 2011 Feb 21 TI - 'Shape effects' in metal oxide supported nanoscale gold catalysts. PG - 2517-27 LID - 10.1039/c0cp02009e [doi] AB - We report the activity of shape-controlled metal oxide (CeO(2), ZnO and Fe(3)O(4)) supported gold catalysts for the steam reforming of methanol (SRM) and the water gas shift (WGS) reactions. Metal oxide nanoshapes, prepared by controlled hydrolysis and thermolysis methods, expose different crystal surfaces, and consequently disperse and stabilize gold differently. We observe that similar to gold supported on CeO(2) shapes exposing the 110 and 111 surfaces, gold supported on the oxygen-rich ZnO 0001 and Fe(3)O(4) 111 surfaces shows higher activity for the SRM and WGS reactions. While the reaction rates vary among the Au-CeO(2), Au-ZnO and Au-Fe(3)O(4) shapes, the apparent activation energies are similar, indicating a common active site. TPR data further indicate that the reaction lightoff coincides with the activation of Au-O-M species on the surface of all three oxide supports evaluated here. Different shapes contain a different number of binding sites for the gold, imparting different overall activity. FAU - Boucher, Matthew B AU - Boucher MB AD - Department of Chemical and Biological Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA. FAU - Goergen, Simone AU - Goergen S FAU - Yi, Nan AU - Yi N FAU - Flytzani-Stephanopoulos, Maria AU - Flytzani-Stephanopoulos M LA - eng PT - Journal Article DEP - 20110117 PL - England TA - Phys Chem Chem Phys JT - Physical chemistry chemical physics : PCCP JID - 100888160 EDAT- 2011/01/18 06:00 MHDA- 2011/01/18 06:01 CRDT- 2011/01/18 06:00 PHST- 2011/01/18 06:00 [entrez] PHST- 2011/01/18 06:00 [pubmed] PHST- 2011/01/18 06:01 [medline] AID - 10.1039/c0cp02009e [doi] PST - ppublish SO - Phys Chem Chem Phys. 2011 Feb 21;13(7):2517-27. doi: 10.1039/c0cp02009e. Epub 2011 Jan 17.