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单分子光显微镜揭示了单个催化剂粒子孔网中的局部扩散系数

Frank C Hendriks¹, Florian Meirer¹, Alexey V Kubarev²

¹Inorganic Chemistry and Catalysis, Debye Institute of Nanomaterials Science, Utrecht University , Utrecht 3584 CG, The Netherlands.

Journal of the American Chemical Society

|September 14, 2017

概括

单分子光显微镜显示大多数探针分子在流体催化裂变 (FCC) 颗粒中是不运动的. 这种技术量化了复杂的多孔材料中的扩散异质性.

科学领域:

材料科学
化学工程
物理化学

背景情况:

流体催化裂变 (FCC) 颗粒在石油精炼中至关重要.
了解FCC巨孔中的分子扩散是优化催化过程的关键.
现实生活中的FCC粒子表现出复杂的层次性孔隙结构.

研究的目的:

为了研究探针分子在现实FCC粒子的宏孔中的自我扩散.
使用先进显微镜量化分子移动性和识别扩散状态.
开发一种用于绘制多孔材料的扩散异质性的方法.

主要方法:

使用单分子光显微镜来追踪探针分子的运动.
机器学习算法被用来将分子轨迹分类为不同的状态.
在FCC粒子孔网内重建分子运动时, 达到纳米尺度的准确性.

主要成果:

发现88%的探针分子是不运动的,可能是由于物理吸收或捕获.
一小部分分子在巨孔中表现出移动 (8%) 或混合 (4%) 的行为.
移动分子的平均扩散系数确定为8 × 10−14 ± 1 × 10−13 m2/s.
分子状态在整个FCC粒子中均分布.

结论:

这项研究成功地绘制了复杂的FCC粒子中的扩散性质.
开发的方法提供了一个强大的工具来评估层次性多孔材料的异质性.
这些发现为FCC催化剂的分子运输限制提供了洞察力,这对过程优化有意义.

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