Intrinsic kinetics of steam methane reforming on a thin, nanostructured and adherent Ni coating

Methane steam reforming reaction in solid oxide fuel cells: Influence of electrochemical reaction and anode thickness

“…To evaluate the influence of operating conditions on the MSR reaction rates in direct internal reforming SOFCs, a reliable kinetic model is required. Two kinetic models, the Power-Law and the Langmuir-Hinshelwood kinetic models which are the most commonly used in SOFC modeling studies been chosen to investigate the influence of the electrochemical reaction and the anode thickness on the reforming kinetic parameters [1,[18][19][20]25,27,28,28,29,[35][36][37][38][38][39][40][41]. A Matlab script has been developed to calculate the kinetic parameters for both models.…”

“…The Power-Law kinetic model which has been intensively studied previously provides a straightforward and convenient method to describe the reaction rate without considering the complex surface chemistry [13,[18][19][20][27][28][29][35][36][37][38][39][40][45][46][47][48][49]. The reaction orders can take any value, with −2.0 to 2.0 being a common range according to previously published data [18][19][20]25,[27][28][29][35][36][37][38][39][40].…”

“…The direct internal reforming makes the SOFC systems more efficient and cost-effective [17]. Studies of MSR reactions have been widely conducted during the last decades, and most were conducted on nickel-based catalytic materials with appropriate ranges of temperature and steam to carbon ratio for safe operations [1,[18][19][20][21][22][23][24][25]. These studies yielded various CH 4 reaction orders and activation energies varying from 19 kJ/mol to 240 kJ/mol [1,21,26].…”

“…Various approximations are made including single layer adsorption, no diffusion limitation, and only the reactants influence the reaction rates [2,10,24,26,[29][30][31][32]. The proposed rate expressions vary among various kinetic models including First-Order [21,24,33,34], Power-Law [18][19][20]25,[27][28][29][35][36][37][38][39][40], Langmuir-Hinshelwood [1,28,38,41], and Langmuir-Hinshelwood-Hougen-Watson [22,38]. The authors of this paper have conducted modeling studies using the most widely used rate expression, the Power-Law expression reported by Achenbach and Riensche [15,16,18].…”

A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

“…criteria used to reduce intra-reactor limitations. L is the length of the bed, 𝑑 𝑝 is the particle diameter, 𝑑 𝑡 is the internal diameter of the tube, 𝑏 𝑚𝑎𝑥 is the maximum volumetric dilution ratio (inert volume/total volume of solids), ∆𝑥 𝑟𝑒𝑙 is the acceptable relative deviation of the conversion (e.g., 0.05), and 𝑥 𝑑𝑖𝑙 is the conversion obtained with the diluted bed 27. …”