A temperature-programmed reaction method for catalyst testing in the partial oxidation of methane to formaldehyde

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

OSTI ID:5645987

During the last years a large variety of unpromoted and promoted oxide catalysts has been claimed to be effective in the partial oxidation of methane (MPO) to formaldehyde. This reaction proceeds via a very complex network and requires medium-high temperatures (550 < T[sub R] < 650[degrees]C) to attain detectable rates. The unique features of the SiO[sub 2] surface in catalysing the formation of partial oxidation products have been largely documented, while the roles played by MoO[sub 3], V[sub 2]O[sub 5], Nb[sub 2]O[sub 5], WO[sub 3], Cr[sub 2]O[sub 3], and other oxides on the reactivity of the SiO[sub 2] and the nature of the active centers are still topics of debate. A number of papers have particularly addressed the importance of the reaction system and the contribution of the gas phase and/or wall reaction in getting valid and comparable reactivity data. Indeed, given the constraints of the conversion-selectivity relationship, a suitable reactor device must exploit a differential methane conversion level per pass as to ensure high selectivity to HCHO providing also finite conversion values for a reliable kinetic analysis of the data. In this note, the authors present the potentiality of the temperature-programmed reaction (TPR) method in evaluating the activity of the MPO catalysts. A preliminary comparative analysis of the catalytic performances of bare SiO[sub 2] and various silica supported oxide (MoO[sub 3], V[sub 2]O[sub 5], Nb[sub 2]O[sub 5]) catalysts is reported.

• OSTI ID: 5645987
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 143:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
100200 -- Synthetic Fuels-- Production-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
ALDEHYDES
ALKANES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
FORMALDEHYDE
HETEROGENEOUS CATALYSIS
HYDROCARBONS
METHANE
MINERALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
ORGANIC COMPOUNDS
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REDUCTION
REFRACTORY METAL COMPOUNDS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES