Size-controlled Synthesis of MFI Metallosilicate and Their Catalytic Performance on Acetone to Olefins Reaction
Size-controlled Synthesis of MFI Metallosilicate and Their Catalytic Performance on Acetone to Olefins Reaction
复制标题
MFI金属硅酸盐的尺寸控制合成及其对丙酮制烯烃反应的催化性能
DOI：
10.1016/j.micromeso.2015.10.043
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发表时间：
2016
影响因子：
5.2
通讯作者：
T. Masuda
中科院分区：
文献类型：
--
作者：
T. Taniguchi;K. Yoneta;Y. Nakasaka;T. Tago;T. Masuda
采用水热法合成了一系列Al和Fe-MFI分子筛，并采用乳液法合成了纳米级MFI分子筛。UV-vis光谱和ac-NH3-TPD曲线表明，Fe原子被引入到MFI结构的骨架中，并且几乎所有的Fe 3+物种都很好地分散，没有形成大体积的氧化铁颗粒。考察了不同晶粒大小的Al-和Fe-MFI分子筛对丙酮选择性制备异丁烯的影响。与宏观尺寸的MFI沸石相比，纳米尺寸的MFI沸石表现出较长的催化剂寿命。虽然异丁烯通常是在沸石催化剂上的丙酮转化过程中的中间体，但Fe-MFI沸石的弱酸性抑制了过度反应的完成，导致异丁烯的高选择性。
A series of Al- and Fe-MFI zeolites was synthesized using a hydrothermal treatment, and nano-sized MFI zeolites were obtained by an emulsion method. UV–vis spectra andac-NH3-TPD profiles demonstrated that Fe atoms were incorporated into the frameworks of the MFI structures and that almost all of the Fe3+species were well dispersed without forming bulky iron oxide particles. The selective production of iso-butylene from acetone was examined using Al- and Fe-MFI zeolites with different crystal sizes. The nano-sized MFI zeolite exhibited a long catalyst lifetime compared with the macro-sized MFI zeolite. Although iso-butylene is normally an intermediate during acetone conversion over zeolite catalysts, the weak acidity of the Fe-MFI zeolite suppressed the completion of excessive reaction, leading to high selectivity for iso-butylene.