Studies On Supported Cobalt Catalysts For Carbon Dioxide Reforming Of Methane To Syngas

The catalytic reforming of CH₄ with CO₂ has received extensive attention of industrial and academic circles all over the world. It converts two cheapest carbon-containing materials into useful feed stock (syngas) with H₂/CO ratio around 1, which is suitable for the production of high hydrocarbons and oxygenated derivatives. This reaction has also important environmental implications because both CH₄ and CO₂ are regarded as the main factors leading to the green-house effect. Furthermore, this process exhibits certain potential to be used as thermochemical heat-pipe for recovery, storage and transmission of solar and other renewable energy sources. At present, one of the key problems for the application of this process is the development of practical catalysts with high activity and high stability. My major work is focused on the study of Co-based catalysts including deactivation mechanism, carbon deposition behavior, catalyst preparation, Co-Pt/Pd and Co-Ni bimetallic catalyst systems. The principal results are summarized as follows:In chapter 2, The effect of support on the texture and performance of Co-based catalyst was studied. The results showed that the magnitude of metal-support interaction was an important factor affecting catalyst performance. The Co catalysts supported different support such as SiO₂, γ -Al₂O₃ and HZSM-5 exhibited great difference in activity, stability and deactivation mechanism. It was first found that HZSM-5 was an excellent support of Co catalysts for reforming of CH₄ with CO₂. In comparison with Co/HZSM-5 catalyst, Co/γ-Al₂O₃ with Co loading below 6% and Co/SiO₂ catalysts showed poor activity and fast...