交叉射流燃烧制备TiO2/Al2O3表面异质结负载CoMoS纳米复合材料及催化性能

Supported CoMoS catalysts have exhibited excellent hydrodesulfurization activity for removal of sulfur from heavy oil for protecting the environment from SO2. The effect coupling between nano-oxides composites support and controlled dispersion of active CoMoS components can significantly enhance their catalytic activities. Based on the design of surface heterojunctions of TiO2 embedded in Al2O3 and highly effective dispersion of CoMoS clusters on TiO2, this project plans to design and prepare TiO2/Al2O3 with surface-heterojunctions supported CoMoS nanocomposites by a facile intersecting-jet flame approach and study their catalytic performance. By intersecting of two spraying flame and enhanced jet, the tailoring of surface heterojunctions of TiO2/Al2O3 supports and the highly dispersing of CoMo clusters on TiO2 could be realized effectively. For the precise control in the intersecting-jet flame process, the corresponding temperature, velocity, concentration profiles as well as the characteristics of heat and mass transfer will be revealed. And the control method of the morphology structure and interface interaction of Ti-Al surface heterojunctions supported CoMoS will be built as well as the formation mechanism of binary TiO2/Al2O3 oxides with tunable surface heterojunctions. Moreover, the relationship of micostructure and catlaytic performance of as-synthesized nanocomposites will be established. Finally, this study will provide a new insight and promising route for constructing highly efficient supported catalysts.

负载型CoMoS催化剂在重质原油的脱硫加氢反应中具有优异的催化性能，而CoMoS组分与载体间的界面结构设计可以提高催化活性。本项目将利用活性TiO2组分嵌入Al2O3表面形成Ti-Al异质结构，并采用交叉射流燃烧技术实现CoMo组分在TiO2上的分散沉积，设计制备具有表面异质结构TiO2/Al2O3负载CoMoS纳米复合材料，并研究其催化性能。明确交叉射流燃烧过程中射流强度、温度、浓度、速度及热质传递特征对组分间界面作用的影响规律，建立TiO2/Al2O3表面异质结负载CoMoS纳米复合材料的形态与界面控制方法。揭示Al2O3、活性TiO2与CoMoS间的协同耦合效应，建立TiO2/Al2O3负载CoMoS材料与催化性能间的关系，为制备高效、稳定的HDS用催化材料提供新思路。

高效催化材料的开发一直以来是负载型催化剂的研究热点。但是催化剂负载过程中焙烧会使活性组分容易团聚且出现烧结相，造成催化活性与稳定性较差。射流喷雾燃烧技术是一项快速高温反应技术，将其与负载催化剂的制备结合起来，探究如何在火焰反应中引入多功能性的晶态氧化物组分设计异质结构载体，并实现活性组分在功能氧化物表面的分散沉积，增强材料组分间的协同耦合是一个重要的研究方向。本项目采用射流燃烧技术制备了MoO3/Mo6+-TiO2和MoS2/TiO2，石墨烯/Fe3O4，Pt/TixCe(1-x)O2，双金属型Pt-Au/TiO2，Mg-doped TiO2等纳米异质结构催化材料，研究了射流高温反应过程，并考察了了其电化学性能和催化性能，研究了相应的催化机理。.1. 基于高温射流喷雾火焰反应及Mo和Ti离子半径差异，制备了MoO3簇修饰Mo6+掺杂TiO2异质结构材料，应用于锂离子电池负极材料，MoO3/Mo6+-TiO2材料表现出优异的电化学性能。.2. 制备了中空结构石墨烯/Fe3O4纳米异质结构材料和多孔TiO2纳米微球，在石墨烯含量为30%时，具有最高的比饱和磁化强度，且在Fenton催化反应和电催化Fenton反应过程中表现出较高的催化活性，实现了24min 97%的颜色有机污染物的脱色效率。.3. 采用射流喷雾火焰燃烧技术，以钛酸四异丙酯、2-乙基己酸铈为混合载体前驱体，制备出Pt/TixCe(1-x)O2纳米颗粒，H2-TPR结果和CO催化性能结果表明，Pt/Ti0.9Ce0.1O2的还原性最强，在6000 mL/g/h的空速下，可使占1%体积比的CO在70 ℃完全转化。.相关研究成果发表期刊论文6篇，专利2篇，其中标注发表的期刊论文5篇。在此期间，完成了博士后基金面上二等资助基金项目。锻炼了核心技术骨干，合作培养硕士研究生2名。