| dc.description.abstract | Due to the increase in greenhouse gas effects and PM2.5 emissions, global warming and rising sea levels have become pressing issues. Reducing carbon dioxide emissions has become a crucial goal for the coming decades. In addition to reducing emissions and promoting alternative energy sources, utilizing carbon dioxide to produce products or new materials is a more effective and promising approach.
This study employs the reaction between carbon dioxide and ethane to produce ethylene and syngas (H2 and CO) through dry reforming and oxidative dehydrogenation reactions. During the catalyst synthesis phase, a one-step Evaporation-Induced Self-Assembly (EISA) method was used to successfully synthesize ordered mesoporous materials with a two-dimensional hexagonal structure. Catalysts synthesized by this method have the advantages of high surface area and thermal stability, allowing the metal to be highly dispersed in the ordered mesoporous channels, effectively delaying the migration and aggregation of metal particles. The catalysts were analyzed using XRD, nitrogen adsorption-desorption experiments, HR-TEM, H2-TPR, CO2-TPD, NH3-TPD, and XPS, confirming the successful synthesis of the expected mesoporous materials. Fe and Ni were selected as the supported metals for this study, where Fe exhibits good redox properties, and Ni demonstrates excellent catalytic activity. γ-Al2O3, with its good thermal stability, was chosen as the support. Through the one-step EISA method, xFe-yNi/Al2O3 ordered mesoporous metal-oxide catalysts with different Fe and Ni loading ratios were synthesized.
This study mainly investigates the impact of different Fe-Ni ratios in xFe-yNi/Al2O3 ordered mesoporous metal-oxide catalysts under various reaction conditions. In activity tests, it was observed that higher Ni loading promotes the dry reforming reaction, producing more syngas, while higher Fe loading increases the catalyst′s resistance to coking. However, at higher reaction temperatures, ethylene formation was observed even in the absence of a catalyst, indicating that temperature is a major factor influencing ethane conversion to ethylene. The activity test results show that by adjusting the Fe and Ni ratios, the proportion of the produced products can be controlled to some extent.
In summary, we developed mesoporous materials using the EISA method and investigated the effects of Fe-Ni loading ratios and amounts on the reaction. These results will help us gain a deeper understanding of the catalyst′s impact on the reaction, thereby optimizing the catalyst′s performance. | en_US |