H2020Индивидуална стипендия2016–2018

ZeoSynMech · Spatiotemporal and In-situ Spectroscopic Crystallization Studies of Microporous Materials

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

Период: 2016-09-01 → 2018-08-31
Финансиране от ЕС: 165 599 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Зеолитите – микропорени материали, използвани например за пречистване на вода, се изследват чрез 3D микроскопия по време на създаването им. Това помага да се разбере процесът на кристализация, за да се разработват по-ефективни материали по-бързо и с по-ниски разходи.

Този кратък обзор е генериран от изкуствен интелект

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

Резултати накратко

Spatiotemporal and In-situ Spectroscopic Crystallization Studies of Microporous Materials

Zeolite based catalysts are used globally in large quantities across a wide range of applications including chemical production from both renewable and more traditional fossil feedstocks, automotive emissions reduction, gas separation and water treatment. They are able to serve such diverse applications as they are crystalline, microporous materials (pores less than 2 nm) that exhibit robust hydrothermal stability, allowing them to be used under demanding process conditions. Zeolites are naturally occurring minerals, but most that are industrially used are synthetically manufactured. New materials and compositions are demanded to optimize processes and serve new applications, and are often developed by trial and error methods guided by researcher experience since the crystallization process is at best partially understood. The inefficiency of this method makes the development of new materials a time-consuming, costly process. Therefore, the primary scientific objectives of this project were to investigate the synthesis of zeolites using advanced characterization techniques, and especially monitor heteroatom incorporation (the catalytic active site), with the ultimate goal to bring greater insight to the process so that more advanced materials can be engineered. During this project we have investigated the full lifetime of zeolite catalysts from crystallization to deactivation using advanced characterization techniques including atom probe tomography (APT) and scanning transmission X-ray microscopy (STXM). APT is a type of 3-D microscopy that can produce atom-by-atom material reconstructions with sub-nanometer resolution, and STXM is able to produce spatially resolved (50 nm spot size) XANES (X-ray absorption near edge structure) maps of materials to learn more about the local environment of specific elements. Using these advanced characterization techniques, we have added insight to the underlying mechanisms of material crystallization, the distribution of active sites in materials and the deactivation of catalysts. Some of the notable catalysts that were investigated include SAPO-34, which is industrially used to convert methanol (sourced from both renewable and non-renewable feedstocks) into desirable commodity chemicals such as propylene and ethylene, as well as copper-exchanged zeolite SSZ-13 that is used to reduce NOX emissions in diesel vehicles. These applications are top priorities for the European Union within Horizon 2020 as they allow for increasing use of renewables as well as reducing air pollution.

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

Цел на проекта

Microporous materials are crystalline, framework structures that contain pores of less than 2 nm. They commonly exhibit robust hydrothermal stability and are used in a wide range of areas including catalysis, separations, ion exchange and adsorption where their shape and size selectivity often shows superior performance over other materials. They are formed by crystallization from amorphous inorganic oxides, but the underlying mechanisms that govern the crystallization of microporous materials are poorly understood, despite extensive work in this area. This lack of understanding means that the development of new materials and compositions is an inefficient trial and error process mainly guided by heuristics. In this work I propose to study the formation principles of microporous materials through 3D spatiotemporal element mapping and monitoring the incorporation of spectroscopically active and catalytically interesting heteroatoms, namely copper and titanium, in distinct framework structures. This proposal uses two distinct approaches (ex-situ STXM and in-situ spectroscopy) to study two different inorganic chemistries (aluminophosphate and silicate) with two different spectroscopically active heteroatoms (copper and titanium) and four different microporous material frameworks (AFI, CHA, MFI and MWW) in order to probe the underlying crystallization mechanisms behind microporous material synthesis and crystallization. The unprecedented combination of 3D spatiotemporal element mapping at various stages of crystallization combined with in-situ spectroscopic studies of catalytically active elements will lead to previously unavailable information about the underlying mechanisms governing the formation of these materials. These insights will lead to innovations in synthesizing both known and novel materials and compositions.

Оригинален текст от CORDIS (на английски).

Участници

UNIVERSITEIT UTRECHT · UtrechtКоординаторНидерландия