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phosphotungstate
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Improved method for increasing accessible pores of MIL-101(Cr) by encapsulation and removal of Phosphotungstic acid (PTA): Pd/PTA-MIL-101(Cr) as an effective catalyst for CO oxidation
, Article Journal of Cleaner Production ; Volume 347 , 2022 ; 09596526 (ISSN) ; Karimi Sabet, J ; Abbasi, Z ; Ghotbi, C ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
This study forwards a novel and simple approach for encapsulation of Phosphotungstic acid (PTA) into MIL-101(Cr) cavities to develop PTA-MIL-101(Cr) with a high surface area. In this method, the resulting surface area of PTA-MIL-101(Cr) (3563 m2/g) is 1.72 times that of MIL-101(Cr) due to the existence of more accessible pores which are formed by leaching of PTAs incorporated inside MIL-101(Cr) pores during the intense washing. Catalysts are investigated in CO oxidation under atmospheric pressure and feed composition of 1%CO, 20%O2, and 79%He. 3%Pd/PTA-MIL-101(Cr) shows 100%CO conversion at T = 145 °C and outperforms PTA, PTA-MIL-101(Cr), Pd/PTA, 1–3%Pd/MIL-101(Cr), Pd-PTA/MIL-101(Cr), and...
Investigation of Performance and Improvement of the Activity of MOF-based Catalysts in CO Oxidation Reaction
, Ph.D. Dissertation Sharif University of Technology ; Ghotbi, Cyrus (Supervisor) ; Karimi Sabet, Javad (Supervisor)
Abstract
Different catalysts have been proposed for CO oxidation reaction and still many researches are performed to obtain a catalyst with high activity and stability. In this study, MOFs of CuBTC, MIL-101(Cr), and NH2-MIL-101(Cr) and active metal of Pd have been selected and their performances have been investigated in CO oxidation reaction. MOFs have been synthesized by hydrothermal method. Pd loading has been performed by impregnation method in various pH and in aqeous palladium nitrate solution and palladium nitrate solution in nitric acid. To reveal the effect of the nature of noble metal, activity of 1% Pt/MIL has been investigated. Amine-functionalized MIL-101(Cr) has been synthesized by...
Synthesis and characterization of magnetic silica-supported Mn(II)-substituted polyoxophosphotungstate as catalyst in sulfoxidation reaction
, Article Journal of Nanoparticle Research ; Volume 18, Issue 10 , 2016 ; 13880764 (ISSN) ; Zare, M ; Bagherzadeh, M ; Sharif University of Technology
Springer Netherlands
2016
Abstract
Abstract: Polyoxometalate-functionalized magnetic nanoparticles (Fe3O4@SiO2–MnPOW) were successfully synthesized via covalent anchoring of Mn(II)-substituted phosphotungstate on ammonium-modified Fe3O4@SiO2 nanoparticles. The complete characterization of nanoparticles has been carried out by scanning electron microscope, energy-dispersive X-ray, X-ray diffraction, Fourier transform infrared and elemental analysis. The resulting nanocomposites were efficient catalysts for the selective oxidation of sulfides with different green oxidants in good to excellent yields and also high selectivity. Leaching and recycling tests showed that the nanocatalyst can be reused several times without...