Understanding preparation variables in the synthesis of Au/Al 2O3 using EXAFS and electron microscopy

J. H. Yang, J. D. Henao, C. Costello, M. C. Kung*, H. H. Kung, J. T. Miller, A. J. Kropf, J. G. Kim, J. R. Regalbuto, M. T. Bore, H. N. Pham, A. K. Datye, J. D. Laeger, K. Kharas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

The catalytic performance of Au/Al2O3 catalyst is highly sensitive to preparation procedure. EXAFS and TEM characterization of key steps in the preparation in conjunction with activity measurements result in deeper insights into precautions needed and the complex manner residual chloride impacts catalytic activity. Chloride affects the morphological (Au particle size), chemical (reducibility) as well as the catalytic (poisoning) properties of Au. Alternate preparation procedures to the conventional calcination of a catalyst prepared with deposition-precipitation at neutral pH were explored to increase Au loadings. It was found that low temperature H2 reduction of a catalyst prepared at low pH but washed with NaOH is an effective preparation method.

Original languageEnglish (US)
Pages (from-to)73-84
Number of pages12
JournalApplied Catalysis A: General
Volume291
Issue number1-2
DOIs
StatePublished - Sep 12 2005

Funding

Use of the Advanced Photon Source was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. W-31-109-Eng-38. Work performed at MR-CAT is supported, in-part, by funding from the Department of Energy under grant number DE-FG02-04ER46106. The support of the National Science Foundation (CTS-9908181) is also gratefully acknowledged. Portions of this work were was performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) at Sector 5 of the Advanced Photon Source, which is supported by the E.I. DuPont de Nemours & Co., The Dow Chemical Company, the NSF through Grant DMR-9304725 and the State of Illinois through the Department of Commerce and the Board of Higher Education Grant IBHE HECA NWU 96. Use of the Advanced Photon Source was supported by the US Department of Energy, Basic Energy Sciences, Office of Energy Research under Contract No. W-31-102-Eng-38. Support of the work done at Northwestern University was provided by NSF-CTS-0121619. Support for the work done at UNM was provided by NSF grant CTS02-10835 and CTS 99-11174.

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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