酸化ジルコニウムなどの遷移金属酸化物における軽アルカン相互作用の周波数応答とDRIFTSを用いた複合的研究
Rebecca Grün1, Maja Glorius1, Cornelia Breitkopf1
1Chair of Thermodynamics, Technische Universität Dresden, 01069 Dresden, Germany.
Physical chemistry chemical physics : PCCP
|January 7, 2026
まとめ
周波数応答(FR)技術を細孔材料に適用し、クヌーセン領域内の拡散係数と吸着容量を明らかにする。この研究は、多孔質固体中のガス拡散と吸着を分析するための自家製FR法を検証するものである。
科学分野:
- 物理化学
- 材料科学
- 化学工学
背景:
- 周波数応答(FR)は微細孔固体に対して確立されているが、細孔材料に対しては十分に活用されていない。
- 細孔材料中の物質輸送の理解は、様々な応用にとって重要である。
研究 の 目的:
- 細孔材料への周波数応答(FR)技術の応用を探求すること。
- FRを用いて硫酸化ジルコニウム中の拡散と吸着の連成プロセスを調査すること。
主な方法:
- エタン、プロパン、イソブタン、n-ブタン、ネオペンタンなどの様々なアルカンを吸着質として用いた硫酸化ジルコニウムを利用した。
- アルカンと硫酸基の相互作用を研究するためにDRIFT分光法を用いた。
- 細孔中のガスのFRに対するReyesらのモデルを適用し、有効拡散モデルと比較した。
主要な成果:
- 拡散係数はクヌーセン拡散領域と一致する値を得た。
- 吸着容量は吸着等温線データと一致する値に定量化された。
- 吸着と拡散の相互作用から生じる有効拡散係数を評価した。
結論:
- 自家製の体積変動FR法を細孔材料に初めて適用し、成功裏に実施した。
- 細孔性硫酸化ジルコニウムにおける拡散と吸着の連成を特徴づけるFRの効果を実証した。
- FRとDRIFTSを用いた細孔材料の系統的な調査への道を開いた。
さらに関連する動画
関連する概念動画
UV–Vis Spectroscopy of Conjugated Systems
5.8K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is...
One of the factors influencing λmax is...
5.8K
UV–Vis Spectroscopy: Molecular Electronic Transitions
3.0K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
3.0K
UV–Vis Spectroscopy: Woodward–Fieser Rules
30.6K
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a...
30.6K
IR Spectroscopy: Molecular Vibration Overview
5.7K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
5.7K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
3.3K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
According to Hooke's law, the vibrational frequency is directly proportional to...
3.3K
IR Absorption Frequency: Hybridization
1.5K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.5K


