scholarly journals Synergistic Effect between Zr-MOF and Phosphomolybdic Acid with the Promotion of TiF4 Template

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4673
Author(s):  
Zhu Ding ◽  
Xiao Min Zhang ◽  
Xue Chang ◽  
Shuo Wang ◽  
Dan-Hong Wang ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Oxidative Desulfurization ◽  
Phosphomolybdic Acid ◽  
Composite Catalyst ◽  
Titanium Tetrafluoride ◽  
Metal Support Interaction ◽  
Vis Spectroscopy ◽  
Metal Support ◽  
Metal Organic ◽  
Size And Morphology

Metal-Organic Framework (MOF) materials are often modified or functionalized, and then the crystal size and morphology of MOF materials are changed. In the process of preparing UiO-66 confined phosphomolybdic acid (PMA) composites (PU), the TiF4-modified PU (PMA + UiO-66) composite catalyst (TiF4-PU) was successfully synthesized by adding titanium tetrafluoride, and the catalytic desulfurization activity was excellent. Similarly, the reaction mechanism was investigated by means of infrared spectroscopy, Raman spectroscopy, XPS, and UV/Vis spectroscopy. The results show that the addition of TiF4 not only changes the appearance and color of the catalyst, but also changes the valence distribution of the elements in the catalyst. The number of oxygen vacancies in the MOF increases due to the addition of TiF4, and more electrons are transferred from the Zr-MOF to PMA to form more Mo5+, which improved the performance of oxidative desulfurization in comparison. Thus, a stronger strong metal-support interaction (SMSI) effect is observed for TiF4-modified PU catalysts. In addition, the quenching experiment of free radicals shows that ·OH radical is the main active substance in the oxidative desulfurization reaction over TiF4-PU catalyst.

A size-matched POM@MOF composite catalyst for highly efficient and recyclable ultra-deep oxidative fuel desulfurization

2018 ◽  
Vol 5 (7) ◽  
pp. 1563-1569 ◽  
Author(s):  
Yun-Lei Peng ◽  
Jingyi Liu ◽  
Hai-Feng Zhang ◽  
Dong Luo ◽  
Dan Li
Keyword(s):  
Heterogeneous Catalyst ◽  
Phosphotungstic Acid ◽  
Metal Organic Framework ◽  
Oxidative Desulfurization ◽  
Composite Catalyst ◽  
Highly Efficient ◽  
Keggin Type ◽  
Catalytic Oxidative Desulfurization ◽  
Metal Organic ◽  
Organic Framework

A composite of Keggin-type phosphotungstic acid (H3PW12O40) encapsulated in sized-matched metal–organic framework UiO-67 (PW12@UiO-67) was prepared as a heterogeneous catalyst for extractive and catalytic oxidative desulfurization systems (ECODS).

scholarly journals Water Photo-Electrooxidation Using Mats of TiO2 Nanorods, Surface Sensitized by a Metal–Organic Framework of Nickel and 1,2-Benzene Dicarboxylic Acid

Hydrogen ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 58-75
Author(s):  
Sheng-Mu You ◽  
Waleed M. A. El Rouby ◽  
Loïc Assaud ◽  
Ruey-An Doong ◽  
Pierre Millet
Keyword(s):  
Dicarboxylic Acid ◽  
Electrochemical Impedance ◽  
Metal Organic Framework ◽  
Linear Sweep Voltammetry ◽  
Tio2 Nanorods ◽  
Tem Analysis ◽  
Vis Spectroscopy ◽  
Metal Organic ◽  
Benzene Dicarboxylic Acid ◽  
Organic Framework

Photoanodes comprising a transparent glass substrate coated with a thin conductive film of fluorine-doped tin oxide (FTO) and a thin layer of a photoactive phase have been fabricated and tested with regard to the photo-electro-oxidation of water into molecular oxygen. The photoactive layer was made of a mat of TiO2 nanorods (TDNRs) of micrometric thickness. Individual nanorods were successfully photosensitized with nanoparticles of a metal–organic framework (MOF) of nickel and 1,2-benzene dicarboxylic acid (BDCA). Detailed microstructural information was obtained from SEM and TEM analysis. The chemical composition of the active layer was determined by XRD, XPS and FTIR analysis. Optical properties were determined by UV–Vis spectroscopy. The water photooxidation activity was evaluated by linear sweep voltammetry and the robustness was assessed by chrono-amperometry. The OER (oxygen evolution reaction) photo-activity of these photoelectrodes was found to be directly related to the amount of MOF deposited on the TiO2 nanorods, and was therefore maximized by adjusting the MOF content. The microscopic reaction mechanism which controls the photoactivity of these photoelectrodes was analyzed by photo-electrochemical impedance spectroscopy. Microscopic rate parameters are reported. These results contribute to the development and characterization of MOF-sensitized OER photoanodes.

Exfoliating Polyoxometalate‐Encapsulating Metal‐Organic Framework into Two‐Dimensional Nanosheets for Superior Oxidative Desulfurization

ChemCatChem ◽  
2018 ◽  
Vol 10 (23) ◽  
pp. 5386-5390 ◽  
Author(s):  
Lili Xu ◽  
Yang Wang ◽  
Tingting Xu ◽  
Shengjun Liu ◽  
Jing Tong ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Oxidative Desulfurization ◽  
Two Dimensional ◽  
Metal Organic ◽  
Organic Framework

Integration of a metal–organic framework with zeolite: a highly sustainable composite catalyst for the synthesis of γ-valerolactone and coumarins

2018 ◽  
Vol 2 (6) ◽  
pp. 1287-1298 ◽  
Author(s):  
Poonam Rani ◽  
Rajendra Srivastava
Keyword(s):  
Metal Organic Framework ◽  
Zeolite Beta ◽  
Composite Catalyst ◽  
Zeolite A ◽  
Efficient Catalyst ◽  
Excellent Activity ◽  
Metal Organic ◽  
Coumarin Synthesis ◽  
Organic Framework

Zr-BDC-MOF and zeolite Beta were entangled to form an efficient catalyst that exhibited excellent activity towards biomass derived liquid γ-valerolactone fuel and coumarin synthesis.

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