摘要
采用CO和NO作为探针分子,应用原位红外光谱法(in-situ FT-IR)和程序升温还原(H2-TPR)对Mo/γ-Al2O3和Co-Mo/γ-Al2O3加氢催化剂进行表征,并对催化剂进行了加氢脱硫(HDS)活性评价。实验结果表明,在Co-Mo/γ-Al2O3催化剂表面存在三个吸附位;在Mo/γ-Al2O3催化剂中加入助剂钴对钼吸附位起到显著的改性作用,并且引入新的活性中心,提高了催化剂的催化活性;随着钼含量的增加,活性中心数目逐渐增多;用CO-NO共吸附原位红外光谱研究了Co-Mo/γ-Al2O3催化剂表面活性中心的信息,证明不同的Mo中心分别吸附CO和NO,并将它们区分开来,解决了不同活性中心的光谱互相重叠的问题。
The active sites of reduced Mo/γ-Al2O3 and Co-Mo/γ-Al2O3 hydrotreating catalysts were studied by in-situ FT-IR using CO and NO as probe molecules;the results were correlated with their activity in hydrodesulfurization（HDS） and behavior in temperature programmed reduction（H2-TPR）.The results indicate that there exist three main adsorption sites on the surface of Co-Mo/γ-Al2O3 catalysts.The addition of cobalt to Mo/γ-Al2O3 is able to modify Mo sites and to introduce active Co sites;an increase of the molybdenum content may also increase the number of active sites and improve the catalytic activity of Co-Mo/γ-Al2O3.FT-IR spectra of CO and NO co-adsorption is able to distinguish the spectra overlapping of different active sites,which reveals that CO and NO are actually adsorbed on different Mo active sites.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2013年第6期710-714,共5页
Journal of Fuel Chemistry and Technology
