(600q) Methane Combustion Over MnOx-Based Catalysts At Low Temperatures : Operando Raman and Kinetic Study

Jing Xu, Like Ouyang, Wei Mao, Xin-Chao Xu,Jun-Jie Su, Yi-Fan Han*^,†

^†State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China.

*To whom correspondence should be adressed. E-mail: yifanhan@ecust.edu.cn. Tel: +86-21-64251928, Fax: +86-21-64251928

Abstract: We here report on a mechanistic study of low-temperature methane combustion over Mn-based catalysts via operando Raman and kinetic measurements in a pressure range from 0.01 to 0.1MPa and temperature range from 298 to 753K. The variation of catalyst structure with temperature, pressure and ratio of CH₄/O₂ was thoroughly characterized. In addition, other techniques such as in situ diffuse reflectance infrared Fourier transform spectroscopy of CO adsorption (DRIFTS), X-rays photon spectroscopy (XPS) were also used. We believe in situ/operando spectroscopies in combination with kinetics is a convenient and versatile technique for the investigation of the relationship of the catalyst structure and activity.