Supported magnetite catalysts for the water-gas shift surface titration using nitric oxide

Conference · Sun Jan 01 04:00:00 UTC 1978 · 71st AIChE Annu. Meet. Pap.; (United States)

OSTI ID:6873121

Lund, C R.F.; Schorfheide, J J; Dumesic, J A

The adsorption of NO was successfully used in measuring the surface area of unsupported magnetite samples pretreated in a flowing CO/sub 2//CO mixture (7:1 molar ratio) at 650/sup 0/K for five hours and evacuated (the Critical step) at 650/sup 0/K and 0.0001 Pa for one hour. The adsorption isotherm for 273/sup 0/K obeyed the Freundlich equation at 0.133-27 kPa and consistent values of NO uptake were obtained. These values, normalized by the nitrogen BET monolayer capacity, were then used to estimate the surface cation density, in good accord with model calculations based on various low index faces of magnetite. Long magnetite evacuation times, e.g., 25 hr, reduced the adsorbent surface, increased the NO uptake, and partially reduced NO to N/sub 2/O, and the titration could be performed only by combining the static adsorption measurements with gas-phase analysis. SiO/sub 2/ and Al/sub 2/O/sub 3/ did not adsorb significant amounts of NO, thus making the technique well suited for supported samples. The attempts to use CO as a titrant were unsuccessful.

• Research Organization: Univ. of Wisconsin, Madison
• OSTI ID: 6873121
• Report Number(s): CONF-781110-
• Conference Information: Journal Name: 71st AIChE Annu. Meet. Pap.; (United States) Journal Volume: 62e
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
CATALYST SUPPORTS
CHALCOGENIDES
HIGH TEMPERATURE
IRON COMPOUNDS
IRON ORES
IRON OXIDES
MAGNETITE
MATHEMATICAL MODELS
MEASURING METHODS
MINERALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SURFACE AREA
SURFACE PROPERTIES
TITRATION
TRANSITION ELEMENT COMPOUNDS