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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >In Situ NMR Imaging Studies of the Drying Kinetics of Porous Catalyst Support Pellets
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In Situ NMR Imaging Studies of the Drying Kinetics of Porous Catalyst Support Pellets

机译：多孔催化剂载体颗粒干燥动力学的原位NMR成像研究

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摘要

The proton NMR imaging (microscopy) technique is employed to study the process of drying of alumina and titania porous catalyst support pellets impregnated with various liquids. Despite the short spin-spin relaxation times usually exhibited by liquids that permeate porous solids, the possibility to monitor their evaporation in real time by detecting one-dimensional liquid concentration profiles along the diameter of a cylindrical sample is demonstrated. In the qualitative discussion of the results, it is shown that the experiment is sensitive to the fine details of the drying process, such as the efficiency of liquid transport and peculiar profile shape transformations in the course of drying. A simple experiment is proposed that yields an empirical relation between the detected profile intensity and the actual liquid content, which allows one to correct the detected profiles for the inevitable T↓(2)-weighting effects.
机译：质子核磁共振成像（显微镜）技术用于研究浸渍有各种液体的氧化铝和二氧化钛多孔催化剂载体颗粒的干燥过程。尽管渗透多孔固体的液体通常表现出较短的自旋-自旋弛豫时间，但仍显示了通过检测沿圆柱形样品直径的一维液体浓度分布来实时监控其蒸发的可能性。在对结果的定性讨论中，表明该实验对干燥过程的精细细节敏感，例如干燥过程中液体的输送效率和特殊的轮廓形状转换。提出了一个简单的实验，该实验在检测到的轮廓强度和实际液体含量之间产生了经验关系，这使得人们可以针对不可避免的T↓（2）加权效应校正检测到的轮廓。

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