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Self-assembly of fibrous ZSM-5 zeolites in the presence of sodium alginate
Particuology ( IF 3.5 ) Pub Date : 2017-05-02 , DOI: 10.1016/j.partic.2017.01.002
Jinlong Jiang , Shoupeng Ji , Chuansong Duanmu , Yichang Pan , Jie Wu , Mei Wu , Jing Chen

ZSM-5 zeolites with a fibrous morphology were successfully self-assembled in the presence of sodium alginate. The effect of the sodium alginate concentration, Si/Al molar ratio in the synthesis gel, crystallization temperature and time, and the addition order of the sodium alginate on the morphology of the ZSM-5 zeolites was investigated. The possible formation mechanism of fibrous ZSM-5 zeolite crystals was also proposed. The results indicated that the carboxyl and hydroxyl groups of sodium alginate synergistically induced the self-stacking of ZSM-5 nanocrystals and thus the formation of the fibrous ZSM-5 zeolites. The Si/Al molar ratio of the fibrous ZSM-5 zeolites could be adjusted by controlling the amount of the NaAlO2 additive; however, high Si/Al molar ratios also hindered the self-stacking of ZSM-5 nanocrystals. A high crystallization temperature (180 °C), a moderate sodium alginate concentration (8.33 g/L), and the addition of sodium alginate prior to tetraethoxysilane were necessary for the formation of fibrous ZSM-5 zeolites.



中文翻译:

藻酸钠存在下ZSM-5纤维状沸石的自组装

在海藻酸钠存在下,具有纤维形态的ZSM-5沸石可成功地自组装。研究了藻酸钠浓度,合成凝胶中Si / Al摩尔比,结晶温度和时间以及藻酸钠的添加顺序对ZSM-5沸石形态的影响。还提出了纤维状ZSM-5沸石晶体的可能形成机理。结果表明,藻酸钠的羧基和羟基协同诱导了ZSM-5纳米晶体的自堆积,从而形成了ZSM-5纤维状沸石。可以通过控制NaAlO 2的量来调节ZSM-5纤维状沸石的Si / Al摩尔比添加剂; 然而,高的Si / Al摩尔比也阻碍了ZSM-5纳米晶体的自堆叠。高结晶温度(180°C),适度的海藻酸钠浓度(8.33 g / L)和在四乙氧基硅烷之前添加海藻酸钠对于形成ZSM-5纤维状沸石是必需的。

更新日期:2017-05-02
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