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A Study on Mono and Mixed Nano‐supported Co‐based Catalysts for Dry Reforming of Methane
Author(s) -
AlFatesh Ahmed Sadeq
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10113
Subject(s) - calcination , catalysis , thermogravimetric analysis , carbon dioxide reforming , methane , space velocity , desorption , syngas , chemical engineering , cobalt , materials science , chemistry , adsorption , temperature programmed reduction , inorganic chemistry , selectivity , organic chemistry , engineering
Effect of calcination temperature on Co‐based catalysts was studied in order to evaluate the modifications in structural and catalytic properties for catalytic reforming of CH 4 with CO 2 . In this regard, two sets of mono ( i.e ., CeO 2 and ZrO 2 ) and mixed nano‐supported ( i.e ., CeO 2 –ZrO 2 ) cobalt‐based catalysts, calcined at two different temperatures (500 and 900 °C), were prepared. To evaluate the catalytic activity of the prepared catalysts, CO 2 –CH 4 reforming reaction was performed in a micro tubular reactor under atmospheric conditions (1 atm) and at different reaction temperatures ranging from 450 to 800 °C. For stability evaluation, the time on stream experiments, under similar reaction conditions, was conducted at 700 °C for 9 h. Furthermore, for selected catalysts the effect of reactants feed ratio ( CO 2 / CH 4 ) and gas space velocity ( GSV ) were also studied. Various techniques such as N 2 adsorption–desorption isotherm, temperature‐programmed reduction ( TPR ), temperature‐programmed desorption ( TPD ), X‐ray diffraction ( XRD ), and thermogravimetric analysis ( TGA ) were used to characterize the prepared catalysts. It was found that the use of a specific calcination temperature in the pretreatment step had a strong influence on catalytic activity, stability, and amount of carbon deposition over catalyst surface in the dry reforming of methane. Additionally, the study revealed that the catalysts calcined at 500 °C had better activity and stability than those calcined at 900 °C.