CO hydrogenation over PdNi sub x alloys encaged in NaY zeolite

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90117-Z· OSTI ID:7107097

Feeley, J S; Stakheev, A Yu; Cavalcanti, F A.P.; Sachtler, W M.H. ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

Bimetallic (Pd + Ni)/NaY samples were studied and compared with monometallic Pd/NaY and Ni/NaY samples and their physical mixture. Samples were characterized by XRD, XPS, and CO hydrogenation. The formation of PdNi, alloy particles encaged in NaY zeolite was found for the bimetallic samples. Under conditions of CO hydrogenation, significant changes in sizes and distributions of Pd, Ni, and PdNi{sub x}, particles take place. Metal particle growth is accompanied by local collapse of the zeolite lattice. The selectivity of PdNi{sub x} alloys for methane formation was significantly higher than that of monometallic Pd or Ni particles or of their physical mixtures. On mixed PdNi{sub x} ensembles the rate of CO dissociation and/or CH{sub x} hydrogenation appears to be enhanced with respect to monometallic ensembles. Acid leaching of Ni by zeolite protons from alloy particles restores a metal surface rich in Pd, leading to an enhanced with respect to monometallic ensembles. Acid leaching of Ni by zeolite protons from alloy particles restores a metal surface rich in Pd, leading to an enhanced selectivity to methanol and its consecutive products, dimethyl ether and higher hydrocarbons.

• DOE Contract Number: FG02-87ER13654
• OSTI ID: 7107097
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 136:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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