H2020Индивидуална стипендия2017–2019

NewCat4Bio · Innovative sol-gel strategies for the production of homogeneous, hydrothermally stable, and porous mixed metal oxide catalysts for biomass conversion applications

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

Период: 2017-08-01 → 2019-07-31
Финансиране от ЕС: 172 800 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Металосиликатните катализатори се изследват чрез нов химичен метод, за да се подобрят процеси като превръщането на биоалкохоли в горива. Това е важно, защото повишава стабилността на материалите при работа с вода и ефективността при преработката на биомаса.

Този кратък обзор е генериран от изкуствен интелект

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

Резултати накратко

Innovative sol-gel strategies for the production of homogeneous, hydrothermally stable, andporous mixed metal oxide catalysts for biomass conversion applications

Mixed metal oxides play an important role in many industrial applications, as adsorbents, sensors, electrolytes in batteries, heterogeneous catalysts, etc. Among them, metallosilicates are particularly useful in heterogeneous catalysis, since their acido-basic properties can be tuned by the amount, nature and dispersion of the metals incorporated in the silica matrix, by synthesis conditions, by post-treatments, etc. Metallosilicates are used as catalysts in epoxidation of alkenes, cracking, isomerization reactions, etc. Nowadays they are applied in the biomass and biofuel sector, where they catalyze the dehydration of bioalcohols, (trans)esterification and hydrolysis in oleochemistry, biopolymer hydrolysis, condensation reactions, etc. However for this modern purpose the performance of metallosilicates is not fully satisfactory, mainly due to their low stability in the presence of water. In this project, we proposed to explore and evaluate non-hydrolytic sol-gel processing of novel metallosilicate catalysts to tackle these challenges, thereby supporting the efficiency and competitiveness of biomass valorization. The main objective of our research project was to take advantage of the non-hydrolytic sol-gel chemistry to prepare, characterize and apply new homogeneous, hydrothermally stable, and porous mixed metal oxide catalysts with high performance in biomass conversion applications. In terms of catalyst synthesis, we (i) studied the dispersion of the metal in silica matrices, (ii) tried to improve the hydrothermal stability by using appropriate hybrid precursors and surface modifiers with hydrophobic moieties and (iii) controlled porosity by the use of various solvents, templates, and precursors. These catalysts were characterized by an array of advanced physico-chemical tools to evaluate the effects of preparation parameters on the desired properties – homogeneity, hydrothermal stability and texture. The materials were evaluated as heterogeneous catalysts in a topical reaction of biomass valorization: ethanol dehydration to ethylene. We followed the influence of the materials properties on catalyst activity, selectivity and lifetime. The main conclusions are as follows: (i) non-hydrolytic sol-gel chemistry allows to prepare metallosilicates with a high homogeneity of metal dispersion within silica matrices, this in turn leads to improved acido-basic properties and markedly better catalytic activity and selectivity to ethylene in comparison to commercial benchmarking catalysts, (ii) a broad variety of organic groups were introduced into the metallosilicate materials, direct bond between Si and aromatic groups is not stable under the reaction conditions, alkyl groups are stable and lead in some cases to an improvement of catalytic activity, and (iii) catalyst lifetime depends on the textural properties and strength of acid sites, some samples proved to be highly stable during our stability tests.

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

Цел на проекта

The project is focused on the preparation, characterization and application of (hydro)thermally stable, homogeneous, andporous metallosilicate catalysts. As a synthetic route we will apply non-hydrolytic sol-gel routes since they produce materialswith high homogeneity and they allow the one-step functionalization of the oxides surface. We will focus and demonstrateour results primarily on the synthesis of alumosilicates, and then broaden the work to Zr-, Ti-, Nb-, and Ta-doped silicates.We will use advanced analytic techniques for the characterization of heterogeneous catalysts – infrared spectroscopy, solidstate nuclear magnetic resonance, nitrogen and ammonia adsorption-desorption experiments, electron microscopy, powderx-ray diffraction, small angle x-ray scattering, and surface analytical techniques – time-of-flight secondary ion massspectrometry and x-ray photoelectron spectroscopy. We will evaluate our materials as catalysts in alcohol dehydration. Forthis type of reaction it is desirable to have hydrothermally stable acidic material. Hydrothermal instability is usually the maindrawback of mixed metal oxides. Therefore we will tune the hydrophobicity of prepared materials and their surfaces byintroduction of various organic groups in order to improve their performances. We will focus on the control of the pore sizedistribution as well and prepare stable and homogeneous materials with large pores applicable in catalytic actions on bulky(bio)molecules. In such a way the project will establish fruitful cooperation between the two research groups – one focusedprimarily on the synthetic pathways to novel materials and the second focused on their application in heterogeneouscatalysis. The fellow will learn new characterization techniques and catalytic testing under industrially-relevant conditions. Hewill work independently, attain new soft skills and will prepare for the establishing of new research group back in Brno.

Оригинален текст от CORDIS (на английски).

Участници

UNIVERSITE CATHOLIQUE DE LOUVAIN · LOUVAIN LA NEUVEКоординаторБелгия