Uniform 2 nm gold nanoparticles supported on iron oxides as active catalysts for CO oxidation reaction: Structure-activity relationship

Guo, Yu; Senanayake, Sanjaya; Gu, Dong; Jin, Zhao; Du, Pei -Pei; Si, Rui; Xu, Wen -Qian; Huang, Yu -Ying; Tao, Jing; Song, Qi -Sheng; Jia, Chun -Jia; Schueth, Ferdi

doi:10.1039/c4nr06967f

Title: Uniform 2 nm gold nanoparticles supported on iron oxides as active catalysts for CO oxidation reaction: Structure-activity relationship

Journal Article · Mon Jan 12 00:00:00 EST 2015 · Nanoscale

DOI:https://doi.org/10.1039/c4nr06967f· OSTI ID:1213360

Guo, Yu ^[1]; Senanayake, Sanjaya ^[2]; Gu, Dong ^[3]; Jin, Zhao ^[1]; Du, Pei -Pei ^[4]; Si, Rui ^[4]; Xu, Wen -Qian ^[2]; Huang, Yu -Ying ^[4]; Tao, Jing ^[2]; Song, Qi -Sheng ^[1]; Jia, Chun -Jia ^[1]; Schueth, Ferdi ^[3]

Shandong Univ., Jinan (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Max-Planck Institut fur Kohlenforschung (Germany)
Chinese Academy of Sciences (CAS), Beijing (China)

Uniform Au nanoparticles (~2 nm) with narrow size-distribution (standard deviation: 0.5–0.6 nm) supported on both hydroxylated (Fe_OH) and dehydrated iron oxide (Fe_O) have been prepared by either deposition-precipitation (DP) or colloidal-deposition (CD) methods. Different structural and textural characterizations were applied to the dried, calcined and used gold-iron oxide samples. The transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) described the high homogeneity in the supported Au nanoparticles. The ex-situ and in-situ X-ray absorption fine structure (XAFS) characterization monitored the electronic and short-range local structure of active gold species. The synchrotron-based in-situ X-ray diffraction (XRD), together with the corresponding temperature-programmed reduction by hydrogen (H₂-TPR), indicated a structural evolution of the iron-oxide supports, correlating to their reducibility. An inverse order of catalytic activity between DP (Au/Fe_OH < Au/Fe_O) and CD (Au/Fe_OH > Au/Fe_O) was observed. Effective gold-support interaction results in a high activity for gold nanoparticles, locally generated by the sintering of dispersed Au atoms on the oxide support in the DP synthesis, while a hydroxylated surface favors the reactivity of externally introduced Au nanoparticles on Fe_OH support for the CD approach. This work reveals why differences in the synthetic protocol translate to differences in the catalytic performance of Au/FeO_x catalysts with very similar structural characteristics in CO oxidation.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1213360

Report Number(s):: BNL-108165-2015-JA; NANOHL; R&D Project: CO009; KC0302010

Journal Information:: Nanoscale, Vol. 7, Issue 11; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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Effect of Nickel Oxide Doping to Ceria-Supported Gold Catalyst for CO Oxidation and Water-Gas Shift Reactions Shu, Miao; Wei, Shuai; Jia, Chun-Jiang Catalysts, Vol. 8, Issue 12 https://doi.org/10.3390/catal8120584	journal	November 2018
Monolithic Au/CeO ₂ nanorod framework catalyst prepared by dealloying for low-temperature CO oxidation Zhang, Xiaolong; Duan, Dong; Li, Guijing Nanotechnology, Vol. 29, Issue 9 https://doi.org/10.1088/1361-6528/aaa726	journal	January 2018
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Geometrical Structure of the Gold-Iron(III) Oxide Interfacial Perimeter for CO Oxidation Wei, Xuejiao; Shao, Bin; Zhou, Yan Angewandte Chemie, Vol. 130, Issue 35 https://doi.org/10.1002/ange.201805975	journal	July 2018

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