Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2019-10-12 , DOI: 10.1016/j.micromeso.2019.109789 Lianggang Zeng , Zhichao Yu , Zhongtian Sun , Yide Han , Yan Xu , Junbiao Wu , Zhiqiang Liang , Zhuopeng Wang
The crystallization time of SSZ-13 was shortened from several days to 6 h without seeding or pre-aging at conventional synthetic temperature. The fast synthesis was realized by converting a clear-sol derived dry gel with the assistance of steam at 160 °C with a high yield (86%). The crystals of fast synthesized SSZ-13 appeared much smaller in size (333 ± 52 nm) compared to its bulk conventional counterpart. The effects of synthetic parameters such as silica sources, water to dry-gel ratio, aluminum content and inorganic cations were investigated. It was concluded that appropriate chosen of silica source and water to dry-gel ratio was the key to accelerate the formation of SSZ-13. The fast-synthesized SSZ-13 was tested with the reaction of methanol to olefins and showed a more than twofold increase in catalyst lifetime and higher selectivity to olefins than that of the conventional SSZ-13.
中文翻译:
蒸汽辅助结晶法快速合成SSZ-13分子筛
SSZ-13的结晶时间从几天缩短到6小时,而无需在常规合成温度下进行晶种或预老化。快速合成是通过在160°C的蒸汽辅助下以高产率(86%)转化透明溶胶衍生的干凝胶而实现的。快速合成的SSZ-13晶体看上去比其体积较大的常规对应物小得多(333±52 nm)。研究了诸如二氧化硅来源,水与干凝胶之比,铝含量和无机阳离子等合成参数的影响。得出的结论是选择硅石源和水,以干凝胶比率适当是加速SSZ-13形成的键。