Fabrication of glass immobilized amorphous organotitanium polymer for enhancing catalytic turnover frequency and stabilities in photocatalytic reduction of CO2

Zhao, Yuan; Ye, Xiangzhi; Liu, Yuan; Deng, Yunshui; Wen, Man; He, Jianxiong; Jiang, Hong; Xiong, Chengdong

doi:10.1016/j.apcata.2022.118910

Cited by 4 publications

(2 citation statements)

References 48 publications

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“…Generally, emission is indicative of charge recombination, which in the case of COK‐47 originates from either insufficient mobility of the photoexcited electrons or the presence of missing ligand defects acting as recombination centers. [ 42–44 ] The almost complete quenching of emission in nanocrystalline defect‐free COK‐47 ISO – compared to COK‐47 S and COK‐47 L – suggests a more efficient charge separation, which potentially provides longer‐lived charge carriers and avoids quick radiative recombination processes, as we have demonstrated in our previous work. [ 13 ] Time‐resolved emission spectroscopy (TRES) measurements (Figure 3c) support this hypothesis showing that COK‐47 ISO has the longest lifetime with τ = 2.17 ns, compared to COK‐47 L and COK‐47 S , with τ = 1.43 and 0.30 ns, respectively, which correlates well with the increasing defect content and larger particle dimensions found in the samples.…”

Section: Resultsmentioning

confidence: 63%

The Emergence of 2D Building Units in Metal‐Organic Frameworks for Photocatalytic Hydrogen Evolution: A Case Study with COK‐47

Ayala

Naghdi

Nandan

et al. 2023

Advanced Energy Materials

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Metal‐organic frameworks (MOFs) are promising materials for photocatalytic water splitting reactions, but examples of visible light‐responsive, catalytically active, and stable MOFs are still rare. A detailed investigation is conducted for COK‐47 – a recently described MOF comprising 2D Ti‐O6 secondary building units (SBUs) – toward a photocatalytic hydrogen evolution reaction (HER), showing how overall particle morphology, surface area, and missing ligand defects are central parameters governing the material's ultimate performance. The newly synthesized COK‐47ISO is among the most active MOFs to date, yielding HER‐rates of 8.6 µmol h−1, and an apparent quantum yield (AQY) of 0.5% under visible light illumination. Optoelectronic and photoluminescence investigations, supported by theoretical calculations, enable the unraveling of its electronic structure along with charge transfer and recombination kinetics. A wavelength‐dependent reaction mechanism is proposed involving ligand to metal charge transfer (LMCT) and the main challenges for visible or UV photoexcitation are identified, demonstrating that the unique 2D layered structure aids charge separation and is key to the high performance. This work introduces COK‐47 as a promising alternative to the well‐known MIL‐125 family and offers directions for future studies

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Section: Resultsmentioning

confidence: 63%

The Emergence of 2D Building Units in Metal‐Organic Frameworks for Photocatalytic Hydrogen Evolution: A Case Study with COK‐47

Ayala

Naghdi

Nandan

et al. 2023

Advanced Energy Materials

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“…TOF can also be measured using analytical instruments such as mass spectrometers or gas chromatographs by measuring the flow rates of reactants and products [ 84 , 85 ]. The most commonly used method to determine the catalyst TOF is to apply the catalyst under specific reaction conditions, measure the reaction rate and product selectivity, and calculate the TOF [ 86 , 87 ]. Selectivity: Catalyst selectivity refers to the ability of the catalyst to promote a specific reaction pathway among multiple possible pathways.…”

Section: Synthesis Characterization and Performance Evaluation Of Mof...mentioning

confidence: 99%

Advancements of MOFs in the Field of Propane Oxidative Dehydrogenation for Propylene Production

Li,

Ke,

Zhang

et al. 2024

Molecules

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Compared to the currently widely used propane dehydrogenation process for propylene production, propane oxidative dehydrogenation (ODHP) offers the advantage of no thermodynamic limitations and lower energy consumption. However, a major challenge in ODHP is the occurrence of undesired over-oxidation reactions of propylene, which reduce selectivity and hinder industrialization. MOFs possess a large number of metal sites that can serve as catalytic centers, which facilitates the easier access of reactants to the catalytic centers for reaction. Additionally, their flexible framework structure allows for easier adjustment of their pores compared to metal oxides and molecular sieves, which is advantageous for the diffusion of products within the framework. This property reduces the likelihood of prolonged contact between the generated propylene and the catalytic centers, thus minimizing the possibility of over-oxidation. The research on MOF catalyzed oxidative dehydrogenation of propane (ODHP) mainly focuses on the catalytic properties of MOFs with cobalt oxygen sites and boron oxygen sites. The advantages of cobalt oxygen site MOFs include significantly reduced energy consumption, enabling catalytic reactions at temperatures of 230 °C and below, while boron oxygen site MOFs exhibit high conversion rates and selectivity, albeit requiring higher temperatures. The explicit structure of MOFs facilitates the mechanistic study of these sites, enabling further optimization of catalysts. This paper provides an overview of the recent progress in utilizing MOFs as catalysts for ODHP and explores how they promote progress in ODHP catalysis. Finally, the challenges and future prospects of MOFs in the field of ODHP reactions are discussed.

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Optimizing ligand-to-metal charge transfer in metal–organic frameworks to enhance photocatalytic performance

Zhu,

Hou,

Wang

et al. 2024

Chemical Engineering Journal

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Fabrication of glass immobilized amorphous organotitanium polymer for enhancing catalytic turnover frequency and stabilities in photocatalytic reduction of CO2

Cited by 4 publications

References 48 publications

The Emergence of 2D Building Units in Metal‐Organic Frameworks for Photocatalytic Hydrogen Evolution: A Case Study with COK‐47

The Emergence of 2D Building Units in Metal‐Organic Frameworks for Photocatalytic Hydrogen Evolution: A Case Study with COK‐47

Advancements of MOFs in the Field of Propane Oxidative Dehydrogenation for Propylene Production

Optimizing ligand-to-metal charge transfer in metal–organic frameworks to enhance photocatalytic performance

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