Synthesis of hierarchically porous L-KIT-6 silica-alumina material and the super catalytic performances for hydrodesulfurization of benzothiophene
Synthesis of hierarchically porous L-KIT-6 silica-alumina material and the super catalytic performances for hydrodesulfurization of benzothiophene
复制标题
多级孔L-KIT-6硅铝材料的合成及苯并噻吩加氢脱硫超催化性能
DOI：
10.1016/j.apcatb.2014.10.078
复制
发表时间：
2015-04-01
影响因子：
22.1
通讯作者：
Pan, Huifang
中科院分区：
文献类型：
--
作者：
Duan, Aijun;Li, Tianshu;Pan, Huifang
以L型沸石纳米晶为原料，采用两步水热晶化法，以低成本的固体硅铝微球为载体，成功合成了一种新型的微孔/介孔复合材料L-KIT-6（LK）。以LK为载体制备了加氢脱硫催化剂。采用XRD、FTIR、SEM、TEM、N2-吸附、Al-27 MAS NMR、吡啶-FTIR、H2-TPR、XPS和HRTEM等技术对LK微孔/介孔材料及其催化剂CoMo/LK进行了表征。将CoMo/LK催化剂的物化性能与具有不同载体材料的参比催化剂（包括沸石L、KIT-6和γ-Al 2 O3）进行了比较。表征结果表明，LK复合材料的织构和酸性性能与L型分子筛和介孔氧化硅KIT-6相比有显著改善。此外，LK对形成中等MoS 2堆叠形态和更多“边缘”活性中心具有积极影响。CoMo/LK催化剂具有良好的上级催化性能，这是由于CoMo/LK的开孔结构、优异的织构性能、适宜的酸性和MoS 2堆积形态的协同作用。提出了CoMo/LK催化剂上BT加氢脱硫的可能反应网络。(C)2014爱思唯尔有限公司版权所有。
A novel micro/mesoporous composite material L-KIT-6 (LK) was successfully synthesized from zeolite L nano-crystals using low cost solid silica-alumina microsphere via two-step hydrothermal crystallization method. LK was used as catalyst support to prepare the hydrodesulfurization (HDS) catalyst. LK micro/mesoporous material and its corresponding catalyst CoMo/LK were characterized using XRD, FTIR, SEM, TEM, N-2-adsorption, Al-27 MAS NMR, Pyridine-FTIR, H-2-TPR, XPS and HRTEM techniques. The physicochemical properties of CoMo/LK were compared with the reference catalysts with different support materials including zeolite L, KIT-6 and gamma-Al2O3. The characterization results demonstrated that the textural and acidic properties of the LK composite were dramatically improved comparing with that of zeolite L and mesoporous silica KIT-6. Furthermore, LK had a positive effect on the formation of moderate MoS2 stacking morphology and more "edge" active centers. The catalyst CoMo/LK exhibited a superior catalytic performance for HDS of BT, which could be attributed to the synergistic effects of open porous structure, excellent textural property, appropriate acidity, and MoS2 stacking morphology of CoMo/LK. Moreover, a possible reaction network for BT HDS over CoMo/LK catalyst was proposed. (C) 2014 Elsevier B.V. All rights reserved.