Low temperature chemisorption of CO on supported molybdena-alumina catalysts

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1220· OSTI ID:6859166

Sazo, V; Scott, C; Perez Zurita, M J; Eljuri, E J; Goldwasser, J ^[1]

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1. Universidad Central de Venezuela, Caracas (Venezuela)

Molybdena-alumina catalysts have been widely used in the petroleum industry. Site-selective chemisorption of carbon monoxide is one of several techniques use for monitoring the surface cover of these catalysts. Based on the IR results, Knoezinger and co-workers showed that CO adsorption, at 77 K on alumina, gave rise to a strong band at 2152 cm[sup [minus]1] and a shoulder at 2188 cm[sup [minus]1]. The former band, assigned to hydrogen bonded CO molecules, disappeared upon evacuation at the same temperature. The latter band was attributed to carbon monoxide held by coordinatively unsaturated Al[sup 3+], and it was modified to a weak band ([approximately]2198cm[sup [minus]1]) upon evacuation at 77 K. The absence of the high frequency band for a 12% MoO[sub 3]-alumina catalyst suggested an almost unrestricted spreading of the supported molybdates over the support. The main purpose of this work is to re-evaluate the low temperature chemisorption of CO as a method of assaying surface coverage in molybdena-alumina catalysts. In order to achieve this goal, the data obtained in this work, using a simple BET system, is compared to that shown in the work of Diaz and Bussell. 21 refs., 1 fig., 1 tab.

• OSTI ID: 6859166
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 148:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS