Cheng Ming, Zhao Huahua, Yang Jian, Zhao Jun, Yan Liang, Song Huanling, Chou Lingjun
State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences Lanzhou 730000 PR China
University of Chinese Academy of Sciences Beijing 100049 PR China.
RSC Adv. 2019 Mar 28;9(17):9828-9837. doi: 10.1039/c9ra00217k. eCollection 2019 Mar 22.
Ordered mesoporous Zn/AlO materials with varying Zn content were simply prepared an evaporation-induced self-assembly (EISA) method. Dehydrogenation of isobutane to isobutene was carried out on these materials; an isobutane conversion of 45.0% and isobutene yield of 39.0% were obtained over the 10%Zn/AlO catalyst at 580 °C with 300 h GHSV. The obtained materials with Zn content up to 10% possess large specific surface area and big pore volume and zinc species can be highly dispersed on the surface or incorporated into the framework. The acidity of these catalysts was changed by the introduction of Zn, the decrease of strong acid sites is conducive to the promotion of isobutene selectivity and the weak and medium acidic sites played an important role in isobutane conversion. In addition, these catalysts exhibited good catalytic stability, due to the effective inhibition of coke formation by the ordered mesoporous structure.
通过蒸发诱导自组装（EISA）方法简单制备了具有不同锌含量的有序介孔Zn/AlO材料。在这些材料上进行了异丁烷脱氢制异丁烯的反应；在580℃、300 h GHSV条件下，10%Zn/AlO催化剂上异丁烷转化率为45.0%，异丁烯产率为39.0%。所制备的锌含量高达10%的材料具有较大的比表面积和孔体积，锌物种能够高度分散在表面或掺入骨架中。通过引入锌改变了这些催化剂的酸度，强酸位点的减少有利于异丁烯选择性的提高，弱酸和中强酸位点在异丁烷转化中起重要作用。此外，由于有序介孔结构有效抑制了焦炭形成，这些催化剂表现出良好的催化稳定性。
