Date of Graduation
Statler College of Engineering and Mineral Resources
Chemical and Biomedical Engineering
Edwin L. Kugler.
The performance of cobalt tungsten carbide material was investigated for CH4/CO2 reforming. The catalyst was found to convert to a very stable, very active, form when heated in CH4/CO 2 at 850°C and 5 atm. Even after 90 hours on stream, CH4 and CO2 rates of 1.3 and 1.25 mmol/min/g respectively are obtained, with CO yields of 76% and H2/CO ratio close to unity. XRD patterns suggest a phase transformation to WC+Co+C. SEM images suggest formation of encapsulated carbon and whisker carbon.;The kinetics of CH4/CO2 reforming was studied under differential conditions over 500--600°C. The observed rates seem to follow a Langmuir-Hinshelwood type of reaction mechanism. A scheme consisting of four reactions was considered: methane reforming, reverse water gas shift, carbon deposition and reverse boudouard. Carbon deposition and carbon removal are generally disregarded in most of the reported kinetic-models. The parameters of the model were successfully estimated. The comparison plots of the observed data and the predicted model show a good fit.
Iyer, Mahesh Venkataraman, "New catalysts for syngas production from carbon dioxide and methane" (2001). Graduate Theses, Dissertations, and Problem Reports. 1196.