Journal
APPLIED CATALYSIS A-GENERAL
Volume 591, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2019.117371
Keywords
Bimetallic catalyst; nickel platinum; copper platinum; noble metal and base metal alloy; reduction potential; redox deposition method
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Funding
- Japan Science and Technology Agency under the CREST program [JPMJCR16P2]
- US Department of Energy, Basic Energy Sciences [DE-FG02-96ER14669]
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A one-pot redox deposition method is described to prepare silica-supported bimetallic NiPt and CuPt catalysts using differences in standard reduction potentials. The synthesis involved the initial reduction of non-noble metal ions (Ni2+ and Cu2+) by NaBH4, followed by reduction of Pt ions by these reduced metals. Alloy formation and phase purity were established by X-ray diffraction (XRD), bulk composition by X-ray fluorescence (XRF), and surface composition by X-ray photoelectron spectroscopy (XPS). Alloy formation was enhanced by increase in the amount of base metals available to reduce Pt, or through the use of excess NaBH4 after redox deposition. The catalysts were evaluated for methane oxidation at 300-400 degrees C and atmospheric pressure. Reference samples prepared using the incipient wetness impregnation (IW) method had inferior performance and characteristics. The redox deposition method provides a simple and versatile protocol for the preparation of bimetallic alloys between noble metals and base metals.
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