Time-of-Flight Secondary Ion Mass Spectrometry Revealing the Organocatalyst Distribution in Functionalized Silica Monoliths.

IF 2.5 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY ChemistryOpen Pub Date : 2024-09-27 DOI:10.1002/open.202400199
Raoul D Brand, Julia S Schulze, Anja Henss, Bernd M Smarsly
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Abstract

Hierarchically porous monolithic silica shows promise as a carrier material for immobilized organocatalysts. Conventional analysis usually includes physisorption, infrared spectroscopy and elemental analysis, among others, to elucidate the pore space and degree of functionalization of the material. However, these methods do not yield information about the spatial distribution of the organic species inside the monolithic reactor. In this work, time-of-flight secondary ion mass spectrometry has been applied to characterize the surface of organically functionalized silica monoliths. Cross sections of a silica monolith functionalized with 4-dimethylaminopyridine were analyzed and the results were compared with physisorption and elemental analysis experiments of the same material. This way, insight into the radial distribution of the catalyst could be achieved, which might assist in interpreting the performance of such reactors in heterogeneous flow catalysis.

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飞行时间二次离子质谱法揭示功能化二氧化硅单片中的有机催化剂分布。
层状多孔整体二氧化硅有望成为固定化有机催化剂的载体材料。传统的分析方法通常包括物理吸附、红外光谱和元素分析等,以阐明材料的孔隙空间和功能化程度。然而,这些方法并不能得出有机物在整体反应器内的空间分布信息。在这项工作中,采用了飞行时间二次离子质谱法来表征有机功能化二氧化硅单片的表面。分析了 4-二甲氨基吡啶官能化二氧化硅单片的横截面,并将结果与相同材料的物理吸附和元素分析实验进行了比较。通过这种方法,可以深入了解催化剂的径向分布,这可能有助于解释这种反应器在异相流催化中的性能。
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来源期刊
ChemistryOpen
ChemistryOpen CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
4.80
自引率
4.30%
发文量
143
审稿时长
1 months
期刊介绍: ChemistryOpen is a multidisciplinary, gold-road open-access, international forum for the publication of outstanding Reviews, Full Papers, and Communications from all areas of chemistry and related fields. It is co-owned by 16 continental European Chemical Societies, who have banded together in the alliance called ChemPubSoc Europe for the purpose of publishing high-quality journals in the field of chemistry and its border disciplines. As some of the governments of the countries represented in ChemPubSoc Europe have strongly recommended that the research conducted with their funding is freely accessible for all readers (Open Access), ChemPubSoc Europe was concerned that no journal for which the ethical standards were monitored by a chemical society was available for such papers. ChemistryOpen fills this gap.
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