College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China.
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane 4072, Australia.
J Colloid Interface Sci. 2018 Nov 1;529:432-443. doi: 10.1016/j.jcis.2018.06.031. Epub 2018 Jun 15.
A solvothermal-assisted evaporation-induced self-assembly (SA-EISA) approach has been developed for the synthesis of ordered mesoporous alumina (OMA) materials with high thermal stability and improved performance in catalysis. In conventional EISA process, the evaporation step is accompanied by the hydrolysis of organic aluminum precursors, thus the evaporation conditions have significant influences on the reaction and the final structure of OMA. In our approach, the solvothermal treatment step promotes the complete hydrolysis of aluminum precursors and produces partially condensed cluster-like aluminum hydroxyl species, which allows the formation of OMA in a broad range of evaporation conditions. Compared to mesoporous alumina obtained by conventional EISA process, OMA materials prepared by SA-EISA approach exhibit higher specific surface area, pore volume and thermal stability. When used as supporting materials for vanadium oxide catalyst, OMA materials obtained by the SA-EISA approach exhibit excellent activity, selectivity and stability for ethylbenzene dehydrogenation with carbon dioxide as a mild oxidant. Our contribution has provided new understanding in the synthesis of OMA materials with improved performance for catalytic applications.
一种溶剂热辅助蒸发诱导自组装（SA-EISA）方法已被开发用于合成具有高热稳定性和改进催化性能的有序介孔氧化铝（OMA）材料。在传统的 EISA 过程中，蒸发步骤伴随着有机铝前体的水解，因此蒸发条件对反应和 OMA 的最终结构有显著影响。在我们的方法中，溶剂热处理步骤促进了铝前体的完全水解，并产生部分缩合的类铝羟基物种，这使得在广泛的蒸发条件下形成 OMA。与通过传统 EISA 过程获得的介孔氧化铝相比，通过 SA-EISA 方法制备的 OMA 材料表现出更高的比表面积、孔体积和热稳定性。当用作氧化钒催化剂的支撑材料时，通过 SA-EISA 方法获得的 OMA 材料在以二氧化碳为温和氧化剂的乙苯脱氢反应中表现出优异的活性、选择性和稳定性。我们的贡献为合成具有改进催化性能的 OMA 材料提供了新的认识。
