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Catalytic performance and characterization of cobalt-nickel nano catalysts for CO hydrogenation
Mostafa Feyzi,Arash Babakhanian,Mohammad Bagher Gholivand 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
A series of Co-Ni nano catalysts were prepared by co-precipitation method. We investigated the effect of Co/Ni molar ratios precipitate and calcination conditions on the catalytic performance of cobalt nickel catalysts for Fisher-Tropsch synthesis (FTS). The catalyst containing 90%Co/10%Ni was found to be optimal for the conversion of synthesis gas to light olefins. The activity and selectivity of the optimal catalyst were studied in different operational conditions. The results show that the best operational conditions are the H2/CO=2/1 molar feed ratio at 310 oC and GHSV=1,200 h−1 under 5 bar of pressure. The prepared catalysts were characterized by powder X-ray diffraction (XRD),N2 adsorption-desorption measurements such as BET and BJH methods, transmission electron microscopy (TEM) and thermal gravimetric analysis (TGA).
A novel Ce-MOF/PES mixed matrix membrane; synthesis, characterization and antifouling evaluation
Farrokh Mohammadnezhad,Mostafa Feyzi,Sirus Zinadini 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
A new polyethersulfone (PES) nanofiltration membrane, modified with nanocrystalline Ce(III)metal–organic framework (MOF), was produced via the phase inversion method and characterizedusing scanning electron microscopy (SEM), atomic force microscopy (AFM), water contact angle andporosity measurements. The morphology and performance of these membranes were investigated interms of pure waterflux, water contact angle, fouling parameters and dye removal. Modified PESmembranes showed an increase in the pure waterflux relative to the bare membrane. The changes insublayer and skin layer of modified membranes and also increased pore size and porosity is obvious fromthe SEM images of PES membranes porosity measurements. Moreover, the surface hydrophilicity of theMOF embedded membranes was improved due to the tendency of water to the membrane surface. Theantifouling properties of the membranes were evaluated by powder milk solution and measuring thefluxrecovery ratio (FRR). The results revealed the modified membrane with 0.5 wt.% of MOF nanoparticle(NPs) had the best antifouling property and also the highest porosity and waterflux. Nanofiltrationperformance of membranes was appraised by probing of the retention of Direct Red 16. The resultshowed that all the modified membranes have a higher dye rejection capacity than the bare PESmembrane.
Abdolhamid Alizadeh,Mohammad M. Khodaei,Mojtaba Beygzadeh,Davood Kordestani,Mostafa Feyzi 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
A novel biguanide-functionalized Fe3O4/SiO2 magnetite nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperbase in chemical transformations. The structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (TEM), powder X-ray diffraction (XRD), vibrating sample magnetometry (VSM), elemental analyzer (EA), thermogravimetric analysis (TGA), N2 adsorption-desorption (BET and BJH) and FT-IR. The biguanide-functionalized Fe3O4/SiO2 nanoparticles showed a superpara-magnetic property with a saturation magnetization value of 46.7 emu/g, indicating great potential for application in magnetically separation technologies. In application point of view, the prepared catalyst was found to act as an efficient recoverable nanocatalyst in nitroaldol and domino Knoevenagel condensation/Michael addition/cyclization reactions in aqueous media under mild condition. Additionally, the catalyst was reused six times without significant degradation in catalytic activity and performance.
Alizadeh, Abdolhamid,Khodaei, Mohammad M.,Beygzadeh, Mojtaba,Kordestani, Davood,Feyzi, Mostafa Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
A novel biguanide-functionalized $Fe_3O_4/SiO_2$ magnetite nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperbase in chemical transformations. The structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (TEM), powder X-ray diffraction (XRD), vibrating sample magnetometry (VSM), elemental analyzer (EA), thermogravimetric analysis (TGA), $N_2$ adsorption-desorption (BET and BJH) and FT-IR. The biguanide-functionalized $Fe_3O_4/SiO_2$ nanoparticles showed a superpara-magnetic property with a saturation magnetization value of 46.7 emu/g, indicating great potential for application in magnetically separation technologies. In application point of view, the prepared catalyst was found to act as an efficient recoverable nanocatalyst in nitroaldol and domino Knoevenagel condensation/Michael addition/cyclization reactions in aqueous media under mild condition. Additionally, the catalyst was reused six times without significant degradation in catalytic activity and performance.