Evidence for multiple CO hydrogenation pathways on Pt/Al sub 2 O sub 3

Journal Article · Thu Apr 20 04:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100345a008· OSTI ID:5063915

Robbins, J L; Marucchi-Soos, E ^[1]

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1. Exxon Corp. Research Science Labs., Annandale, NJ (USA)

The reactivity of CO toward hydrogen over 12% Pt/Al{sub 2}O{sub 3} is examined by temperature-programmed reduction of adsorbed CO (CO TPR) and infrared spectroscopy. The CO TPR spectra show two methane formation rate maxima near 490 and 613 K. The relative intensities of these peaks depend on sample pretreatment temperature with the 490 K peak dominating with higher reduction temperatures. Infrared spectra show the CO chemisorbs molecularly on Pt at 300 K, but some bound CO is converted to alumina-bound methoxy species as the sample is heated to 400 K in H{sub 2}. IR spectra recorded during CO TPR show the 490 K peak reflects hydrogenation of the surface methoxy to methane. The second CO TPR peak is due to methanation of the remaining CO on Pt.

• OSTI ID: 5063915
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:8; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ACTIVATION ENERGY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ELEMENTS
ENERGY
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
INFRARED SPECTRA
METALS
METHANATION
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
SPECTRA
SPECTROSCOPY
THERMAL ANALYSIS
TRANSITION ELEMENTS