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Methane Steam Reforming over a Ni/NiAl 2 O 4 Model Catalyst—Kinetics
Author(s) -
Sprung Christoph,
Arstad Bjørnar,
Olsbye Unni
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402017
Subject(s) - methane , nial , steam reforming , catalysis , methane reformer , chemistry , kinetics , thermodynamics , kinetic energy , chemical kinetics , water gas shift reaction , activation energy , atmospheric temperature range , hydrogen production , intermetallic , organic chemistry , physics , alloy , quantum mechanics
The steam reforming reaction of methane to synthesis gas (CO and H 2 ) was investigated in a very broad steam‐to‐carbon (S/C) ratio range (0.2–7.1) over a Ni/NiAl 2 O 4 catalyst at 843, 858, and 873 K. The dataset includes 179 data points at each temperature giving a detailed insight in the gradual change of kinetic orders in both methane and steam with changing S/C ratios as well as with total reactant partial pressures at differential conversion levels. At low S/C ratios, steam dominates the kinetics with high kinetic orders (low for methane) and vice versa for methane at high S/C ratios. The extent of the water gas shift reaction was assessed by 13 CO 2 co‐feed experiments and thermodynamic modelling and found to be not in equilibrium. A change in the kinetic isotope effect (i.e., inverse and normal), as well as the apparent activation energy, was observed depending on the applied S/C ratios. The experimental data were satisfactorily described by a Langmuir–Hinshelwood expression.