Li Si-Wen, Wang Wei, Zhao Jian-She
Department of Environmental Engineering, School of Water and Environment, Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Chang'an University, Xi'an 710061, China.
Department of Chemical Engineering, School of Water and Environment, Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Chang'an University, Xi'an 710054, China.
J Colloid Interface Sci. 2020 Jul 1;571:337-347. doi: 10.1016/j.jcis.2020.03.054. Epub 2020 Mar 16.
Magnetic-heteropolyacid mesoporous catalysts have been obtained, in which magnetic FeO in the center of MCM-41 mesoporous materials and APES (3-aminopropyl-triethoxysilane) used to link heteropolyacid. To noted, for the various molar ratio APES used in the synthesized process, different numbers of -OCH were exposed in the final products (zero, one and two), named Fe@MP-1, Fe@MP-2 and Fe@MP-3, respectively. Interestingly, the three kinds of catalysts exhibited the various DBT removal efficiency during the oxidative desulfurization process, mainly due to their structure variance leading to be the research focus in this work. Among them, under the oxygen in air as oxidant, Fe@MP-1, with no -OCH exposed outside, showed the excellent desulfurization activity with 100% DBT conversion in 90 min and behaved nearly no obvious decrease after at least 8 recycling times. Thus, the certain amount of APES, used to link active components with supporters, is suggested as an effective aspect to increase the oxidative desulfurization efficiency and maybe the different types of linkage also show the various influence, which will be focused on in our further researches.
已制备出磁性杂多酸介孔催化剂，其中在MCM - 41介孔材料中心的磁性FeO与用于连接杂多酸的3 - 氨丙基三乙氧基硅烷（APES）相连。值得注意的是，对于合成过程中使用的不同摩尔比的APES，最终产物中暴露的 -OCH数量不同（零个、一个和两个），分别命名为Fe@MP - 1、Fe@MP - 2和Fe@MP - 3。有趣的是，在氧化脱硫过程中，这三种催化剂表现出不同的二苯并噻吩（DBT）去除效率，主要是由于它们的结构差异，这成为了本工作的研究重点。其中，在空气中的氧气作为氧化剂的情况下，外部没有暴露 -OCH的Fe@MP - 1在90分钟内表现出优异的脱硫活性，DBT转化率达到100%，并且在至少8次循环后几乎没有明显下降。因此，用于将活性成分与载体连接的一定量的APES被认为是提高氧化脱硫效率的一个有效方面，并且不同类型的连接方式可能也会产生不同的影响，这将是我们进一步研究的重点。
