The Fabrication And Catalytic Performance Study Of Novel Catalysts For Co Preferential Oxidation

CO preferential oxidation (CO PROX) is considered to be the most direct and effective method for remove CO in the hydrogen-rich gas. Non-noble metal Co-based catalysts instead of noble metal catalysts for CO preferential oxidation (PROX) have practical application value. This paper tries to design and structure novel Co-based catalysts in order to improve the low-temperature activity of non-noble metal-based catalysts and broaden temperature for reaction and improve the ability to resist water and carbon dioxide, thus this lay the foundation for non-noble metals development of CO preferential oxidation.In this paper, the supported Co-based catalysts on AC are prepared for CO preferential oxidation. The modification effect of active carbon, different loading methods of active components, interface effect between cerium oxide and active components, the catalytic performance of new structure of carrier and the introduction of H2O and CO2in the feed gas are studied. The physicochemical properties characterizations of catalysts were employed to reveal the relationship between the catalyst structure and catalytic properties. Research contents included the following aspects:1. Co3O4-CeO2/AC catalysts were prepared, the effects of support modification by H2O2oxidation treatment, catalyst calcination temperature, Ce/Co atomic ratio (nCe/Co), Co3O4-CeO2loading and reaction parameters on catalytic properties of the Co3O4-CeO2/AC catalysts were investigated.2. Based on the above study, Mn-modified Co-based catalysts were prepared. Compared to the different impregnation methods, catalyst which prepared by DP method demonstrate the best catalytic performance for CO PROX.100%CO conversion can be achieve at125-200℃, and the catalyst has a good repeating performance.3. Through control of the microstructure, a novel structure of Ce/Co-Mn/Ce-AC catalyst was builded. Based on the high storage of oxygen properties of CeO2and diversification promoting effect of active component on cobalt-based catalyst, the sandwich-like structure of the catalyst was designed and constructed. Moreover, the catalytic performance is obtained by increasing the contact interface between Ce and Co-Mn. Finally, complete CO transformation takes place in temperature range of100-200℃, and100%CO conversion in temperature range of165-225℃in the presence of H2O and CO2simulation in syngas.