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Direct production of hydrogen peroxide over bimetallic CoPd catalysts:Investigation of the effect of Co addition and calcination temperature

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Green Energy & Environment 2023年第1期8卷 246-257页

作者： Hamidreza Nazeri alireza najafi chermahini Zahra Mohammadbagheri Mirko Prato Department of Chemistry Isfahan University of Technology84154-83111IsfahanIran Materials Characterization Facility Istituto Italiano di TecnologiaVia Morego 3016163GenovaItaly

A series of CoPd/KIT-6 bimetallic catalysts with various Co:Pd molar ratios at different calcination temperatures were prepared and used for the direct synthesis of H_(2)O_(2) from H_(2) and O_(2).These catalysts were characterized by nitrogen adsorption-desorption,low and wide-angle X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),scanning electron microscopy(SEM),elemental mapping and energy-dispersive X-ray(EDX)*** was found that the particle size,electronic interactions,morphology,and textural properties of these catalysts as well as their catalytic activity in the reaction of H_(2) with O_(2) were affected by Co addition and different calcination ***,the results showed that while the H_(2)O_(2) selectivity depends on Pd^(2+) species,the H_(2) conversion is related to Pd0 active *** these catalysts,CoPd/KIT-6 calcined at 350℃(CoPd/KIT-350 catalyst)showed the best catalytic activity with 50%of H_(2)O_(2) selectivity and 51%conversion of H_(2).

关键词： Direct synthesis of hydrogen peroxide Co/Pd catalysts Selectivity The oxidation state of Pd Reusability

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New tetrazole-based organic dyes for dye-sensitized solar cells

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Journal of Energy Chemistry 2015年第6期24卷 770-778页

作者： Zahra Jafari chermahini alireza najafi chermahini Hossein A Dabbagh Abbas Teimouri Department of Chemistry Isfahan University of Technology Chemistry Department Payame Noor University (PNU)

A series of new metal-free organic dyes that contain donors with triphenylamine or its derivatives and tetrazole-based acceptors were synthesized and characterized by photophysical, electrochemical, and the- oretical computational methods. They were applied in nanocrystalline TiO2 solar cells （DSSCs）. It is found that the introduction of diphenylamine units as antennas in the as-synthesized dyes could improve photo- voltaic performance compared with phenothiazine and carbazole units as antennas in DSSCs. The dye with （2H-tetrazol-5-yl） acrylonitrile electron acceptor also displayed the highest solar-to-electrical energy conver- sion efficiency.

关键词： Tetrazole Dye sensitized solar cells DFT Synthesis Anchoring group

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Dehydration of fructose and glucose to 5-hydroxymethylfurfural over Al-KCC-1 silica

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Journal of Energy Chemistry 2018年第3期27卷 769-780页

作者： Fereshte Shahangi alireza najafi chermahini Mohammad Saraji Department of Chemistry Isfalzan University of Technology84154-83111Isfahan.Iran

In this research, the influence of several factors such as reaction time, catalyst weight, temperature and different solvents on dehydration reaction of fructose and glucose to 5-hydroxymethylfurfural（HMF） was surveyed. Nanosphere Al-KCC-1 silica with fibrous morphology was manufactured and used as proficient and recyclable catalyst for this reaction. SEM, TEM, BET, XRD, EDX, elemental mapping, ICP and FT-IR spectroscopy methods were applied for characterization of the Al-KCC-1（molar ratio Si/Al = 5, 40） catalysts. 162℃ and 1 h are the best conditions for the fructose dehydration. Under this situation HMF yield and selectivity are 92.9% and 94.5% respectively and fructose conversion is 98.4%. Also 170℃ and 2 h are the best conditions for the glucose dehydration. In this situation HMF yield and selectivity are 39.0% and39.9% respectively and glucose conversion is 97.8%.

关键词： Glucose Fructose HMF production Al-KCC-1 Dehydration of carbohydrates

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Synthesis of mono and bis-4-methylpiperidiniummethyl-urea as corrosion inhibitors for steel in acidic media

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Frontiers of Chemical Science and Engineering 2011年第1期5卷 43-50页

作者： Abbas TEIMOURI Nasrin SOLTANI alireza najafi chermahini Department of Chemistry Payame Noor University(PNU)Isfahan 81395-671Iran Department of Chemistry Payame Noor University(PNU)Shahin Shahr BranchIsfahan 83196Iran Department of Chemistry Yasouj UniversityYasouj 75918-74831Iran

Mono and bis-4-methylpiperidiniummethyl urea were synthesized,characterized and used as new corrosion inhibitors of mild steel in the acidic *** effect of two compounds on mild steel surface in the 1 mol·L^(–1 )sulphuric acid has been studied by a series of techniques,such as potentiodynamic polarization,weight loss and quantum chemical calculation *** polarization measurements showed that two inhibitors are mixed *** measurements showed that inhibition efficiencies enhanced with increase of inhibitor *** reveals that inhibitive actions of inhibitors were mainly due to adsorption on mild steel *** functional(DFT)calculations have been carried out for the title compounds by performing HF and DFT levels of theory using the standard 6-31G*basis set.

关键词： corrosion inhibitors mild steel acidic medium theoretical studies DFT

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One-pot Green Synthesis of Pyrrole Derivatives Catalyzed by Nano Sulfated Zirconia as a Solid Acid Catalyst

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Chinese Journal of Chemistry 2012年第2期30卷 372-376页

作者： Teimouri, Abbas chermahini, alireza najafi Chemistry Department Payame Noor University 19395-4697 Tehran Iran Department of Chemistry Faculty of Science Yasouj University Yasouj P.O. Box 75918-671671 Iran

A new and efficient method for the preparation of N-substituted pyrroles from one-pot Paal-Knorr condensation has been accomplished using nano-crystalline sulfated zirconia （SZ） as the catalyst in ethanol at moderate temperature. This new protocol has the advantages of easy availability, stability, reusability and eco-friendliness of the catalyst, high to excellent yields, simple experimental and work-up procedure. The synthesized compounds were confirmed through spectral characterization using IR, 1H NMR, 13C NMR and mass spectra.

关键词： sulfated zirconia green synthesis pyrrole Paal-Knorr condensation

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