Abstract
Methane steam reforming experiments were carried out at atmospheric pressure for temperatures between 873 and 1073 K and by varying the partial pressure of methane and steam to achieve S:C between 0.5 and 2.5. Mechanistic considerations for Methane steam reforming (MSR) were derived on the basis of Langmuir–Hinshelwood and Eley–Rideal reaction mechanisms based on single- and dual-site associative and dissociative adsorption of one or both reactants. However, discrimination of these models on statistical and thermodynamic grounds revealed that the model representing a single-site dissociative adsorption of methane and steam most adequately explained the data. However, the product formation rates from these experiments were reasonably captured by power-law model. The parameter estimates from the power-law model revealed an order of 0.94 with respect to methane and −0.16 for steam with activation energy of 49.8 kJ mol−1 for MSR. The negative order with respect to steam for methane consumption was likely due to steam inhibition.
Highlights
Methane steam reforming (MSR) is the most important, well-established and economical route which currently accounts to 48 % of the global hydrogen production [1, 2]
The kinetic analysis of reaction rate data for methane steam reforming over Ce-promoted Ni/SBA catalyst has been carried out
The Langmuir–Hinshelwood model involving single-site and dissociative adsorption of both methane and steam was adequate in explaining the variability in the experimental data while satisfying statistical significance and thermodynamic constraints
Summary
Methane steam reforming (MSR) is the most important, well-established and economical route which currently accounts to 48 % of the global hydrogen production [1, 2]. Mechanistic considerations for Methane steam reforming (MSR) were derived on the basis of Langmuir–Hinshelwood and Eley–Rideal reaction mechanisms based on single- and dual-site associative and dissociative adsorption of one or both reactants.
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