Mechanistic investigation of methane steam reforming over Ce-promoted Ni/SBA-15 catalyst

• Main Authors: Vo, Dai-Viet N., Arcotumapathy, Viswanathan, Alenazey, Feraih, Al-Otaibi, Raja L., Alotaibi, Faisal M., Adesina, Adesoji A.
• Format: Article
• Language: English; English
• Published: Springer 2015
• Subjects: TP Chemical technology
• Online Access: http://umpir.ump.edu.my/id/eprint/12853/1/Appl%20Petrochem%20Res_2015_Dai-Viet%20N.%20Vo.pdf; http://umpir.ump.edu.my/id/eprint/12853/7/Mechanistic%20investigation%20of%20methane%20steam%20.pdf; http://umpir.ump.edu.my/id/eprint/12853/

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.