Kinetic studies of the oxidative coupling of methane over a NaOH/CaO catalyst

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90048-M· OSTI ID:7189371

Lehmann, L; Baerns, M ^[1]

---

1. Ruhr-Univ. Bochum (Germany)

The effects of the partial pressures of oxygen and methane as well as temperature on the rates of C[sub 2] hydrocarbon formation, carbon oxide formation, and total methane conversion in the oxidative coupling of methane over a NaOH/CaO catalyst were studied at differential operating conditions in a microcatalytic fixed-bed reactor. Temperature and partial pressures of the reactants were varied within the following ranges: 933 K [le] T [le] 1,033 K, 5 kPa [le] P[sub CH[sub 4]] [le] 80 kPa, 0.3 kPa [le] P O[sub 2] [le] 20 kPa. The rate of CO[sub x] formation was of 0.5 order in methane as well as in oxygen; the rate of C[sub 2] hydrocarbon formation was first order in methane while it passed through a maximum with respect to oxygen partial pressure. The rate of methane conversion was well described by a power-law rate equation. Mechanistic assumptions derived from these kinetic results and corroborated by kinetic isotope effects are presented. In addition, kinetic equations for C[sub 2] hydrocarbon formation, carbon oxide formation, and methane conversion as reported in the literature were scrutinized for their applicability to describing the experimental data obtained in this work.

• OSTI ID: 7189371
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 135:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
10 SYNTHETIC FUELS
100200* -- Synthetic Fuels-- Production-- (1990-)
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBON OXIDES
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
EQUATIONS
ETHANE
ETHYLENE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
KINETIC EQUATIONS
KINETICS
METHANE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTIAL PRESSURE
PRESSURE DEPENDENCE
REACTION KINETICS
REFORMER PROCESSES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K