Yuan Hui, Zhang Yun-hong, Li Hui-feng, Xu Guang-tong
The Institute for Chemical Physics, Beijing Institute of Technology, Beijing, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 Jul;31(7):1752-7.
Improvement of the selectivity of hydrodesulfurization (HDS) for hydrogenation (HYD) of olefins is crucial to produce sulfur-free (S < 0.001%) gasoline from fluid catalytic-cracked (FCC) gasoline. A series of sulfided CoMo/Al2O3 catalysts with different metal loading were prepared by pore-filling impregnation. MoS2 and COMoS active phases on the surface of sulfided COMo/Al2O3 catalyst were identified and analyzed quantitatively by XPS and in-situ FTIR of adsorbed CO. The results reveal that the increase in COMoS phase on the catalyst surface improves the HDS activity and selectivity. And the HDS selectivity correlates linearly with the ratio of active site number of CoMoS and MoS2, the higher the ratio of active site number of CoMoS and MoS2, the better the HDS selectivity. In situ variable temperature FTIR analysis shows that CoMoS phase has stronger electron accepting ability than MoS2. The strong electron deficient property of CoMoS active sites is the main reason for its excellent HDS activity and selectivity.
提高加氢脱硫（HDS）对烯烃加氢（HYD）的选择性对于从流化催化裂化（FCC）汽油生产无硫（S < 0.001%）汽油至关重要。通过孔填充浸渍法制备了一系列具有不同金属负载量的硫化CoMo/Al2O3催化剂。采用X射线光电子能谱（XPS）和吸附CO的原位傅里叶变换红外光谱（FTIR）对硫化CoMo/Al2O3催化剂表面的MoS2和COMoS活性相进行了定性和定量分析。结果表明，催化剂表面COMoS相的增加提高了HDS活性和选择性。并且HDS选择性与CoMoS和MoS2活性位点数之比呈线性相关，CoMoS和MoS2活性位点数之比越高，HDS选择性越好。原位变温FTIR分析表明，CoMoS相比MoS2具有更强的电子接受能力。CoMoS活性位的强缺电子性质是其优异的HDS活性和选择性的主要原因。
