H2020Индивидуална стипендия2017–2019

ZeoPoreDiff · Linking Zeolite Porosity to Molecular Diffusion at the Single Crystal Level

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2017-07-01 → 2019-06-30
Финансиране от ЕС: 177 599 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Зеолитите са порести материали, в които се създават специални „магистрали“ за по-бързото движение на молекулите. Разбирането на този процес помага за по-ефективното проектиране на нови материали за химични реакции.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Linking Zeolite Porosity to Molecular Diffusion at the Single Crystal Level

Zeolites are porous materials, containing small channels in which molecules bounce back and forth untill they are converted into valuable products. However, due to the molecular size of these zeolite channels, molecules cannot travel inside the material, hindering reaction and the efficient use of the zeolite’s volume. Trial-and-error experimentation have learned that the access of molecules into the zeolite can be improved by generating highway inside the zeolite structure which can transport molecules through the zeolite framework. Yet, a fundamental understanding of this highway generation is still missing and impedes the rational design of the next generation of tailored zeolites. The goal of this project is to apply novel advanced microscopic techniques. A first microscopy-type develloped in this project relies on the scattering of X-rays by zeolite channels. By shining X-ray through the material with a microscope, the highway’s properties can be derived by catching the X-ray which have changed direction. As a second complementary technique, channel formation is monitored live in real-time by watching the highways being formed by placing molecules in the zeolite which lighten up at the channel contours. By applying this powerful combo, new vistas could open up on zeolite highway formation and the dynamics of their generation.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Zeolites are the key enablers of diverse chemical reactions, fulfilling a role of utmost importance in (petro-) chemical industry. They contain a precisely defined micropore network, which exposes a 3-D distribution of Brønsted acid sites. The performance of zeolites relies to a great extent on the accessibility of these acid sites, making the facile molecular diffusion through the zeolite pore network essential. For this reason, methods for hierarchical porosity development – such as steaming – are used to increase the molecular uptake of zeolites. These methods introduce auxiliary meso- and macroporosity, which maximize the utilization of the catalyst volume, and thereby improve the catalyst performance and lifetime. Despite their importance, little is known on zeolite porosity and diffusion due to a lack of nano-sensitive characterization tools which can extract local information on pore features and diffusion properties. The purpose of my research project is to exploit the pore characteristics inside single zeolite crystals through spatially resolved SAXS micro-tomography (µSAXS-CT). This will allow to harvest unprecedented quantitative information on the size distribution and orientation of micro-/meso-/macropores within (sub-) micron volume compartments of single zeolite crystals. In addition, single molecule super-resolution fluorescence microscopy will be used to track the trajectories of single fluorescent reporters with nanometer accuracy during diffusion within these zeolite crystals. This will yield spatially resolved intracrystal diffusion coefficients, which can be directly correlated to the quantitative structural information gained by µSAXS-CT.The combined application of µSAXS-CT and single molecule tracking at different stages of zeolite steaming will allow to link intracrystal heterogeneities in pore and diffusion properties, respectively. This approach will form a first step towards the 3-D transport modelling within single zeolite crystals.

Оригинален текст от CORDIS (на английски).

Участници

UNIVERSITEIT UTRECHT · UtrechtКоординаторНидерландия