Mehran Ghiaci - Academia.edu (original) (raw)

Papers by Mehran Ghiaci

Microporous and Mesoporous Materials, 2016

Chemischer Informationsdienst, Jul 22, 1980

ChemInform Abstract Die Inversionsbarriere ist ∆G ‡ [14.5-14.8]±0.1 kcal/mol, ∆S ‡ = [-2.2 bis-4.... more ChemInform Abstract Die Inversionsbarriere ist ∆G ‡ [14.5-14.8]±0.1 kcal/mol, ∆S ‡ = [-2.2 bis-4.9]±2 eu, ∆H ‡ = [13.1-14.1]±0.5 kcal/mol je nach Lösungsmittel [lH-NMR]; nach Kraft-Feld-Berechnungen (Boyd) ist die Spannungsenergie der gezeigten Kronenkonformation (I) um 4.6 kcal/mol niedriger als die der Sattelkonformation.

Applied Catalysis A-general, 2022

Applied Surface Science, Apr 1, 2022

Applied Organometallic Chemistry, Jun 20, 2018

New Journal of Chemistry, 2020

Phenol, an important bulk organic compound, has diverse applications encompassing both industry a... more Phenol, an important bulk organic compound, has diverse applications encompassing both industry and society. Commercially, it is produced through energy intensive three-step cumene process operating at relatively low yield with the co-production of acetone. Several attempts were made for producing phenol through challenging one-step direct hydroxylation of benzene using different oxidants like O 2 , N 2 O and H 2 O 2. Liquid phase hydroxylation of benzene using H 2 O 2 found to be more attractive due to its low reaction temperature and environmentally friendly nature (as water is only formed as by-product). The hydroxylation reaction occurs through Fenton's mechanism; however along with phenol several other products are also formed due to higher reactivity of phenol compared to benzene. Our research group has been working on this reaction for nearly a decade using layered double hydroxides (LDHs) and their derived forms as heterogeneous selective oxidation catalyst. Screening of different LDHs having different metal ions in the layers revealed the necessity of copper for hydroxylation in pyridine. Addition of co-bivalent metal ion along with copper was made in an endeavour to improve the activity that revealed the promising results for CuZnAl LDHs. Efforts were then made to shift from pyridine to environmentally benign solvent, water, for this reaction that showed reasonably good yields with very high selectivity of phenol. Addition of small amount of sulfolane as a co-solvent increased the selectivity for phenol further. The reusability difficulty faced while using as-synthesized LDHs was overcome when calcined LDHs were used. Structureproperty-activity relationships were deduced to understand the results observed. The present review besides covering our work also provides the state-of-art on this reaction using different oxidants with emphasis on H 2 O 2 .

Materials research express, Aug 30, 2019

Journal of Photochemistry and Photobiology A-chemistry, Apr 1, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Microporous and Mesoporous Materials, Nov 1, 2019

A facile synthesis of molybdenum-doped manganese oxides was achieved by a single step reflux meth... more A facile synthesis of molybdenum-doped manganese oxides was achieved by a single step reflux method. The catalytic activity of molybdenumdoped manganese oxides for the oxidation of cyclohexene was investigated under solvent-free conditions. Various techniques such as X-ray diffraction, transmission electron microscopy, hydrogen temperature-programmed reduction, thermogravimetric analysis and diffuse reflectance infrared Fourier transform spectroscopy of adsorbed pyridine were employed to indentify the features of catalysts as prepared. The characterization results indicate that Mo dopants were successfully incorporated into the crystal structure of manganese oxide and the concentration of Mo dopant had an influence on redox properties as well as the Lewis acid sites of Mo dopant catalysts. Furthermore, 1.0 mol%Mo-MnO 2 catalyst exhibited highest total yield (32.4%) and almost 100% selectivity towards allylic oxidation products, which could be attributed to its relative lower redox properties and the highest Lewis acidity. These results thereby provide an insight of catalyst design in selective catalytic oxidation of cyclohexene.

Journal of The Taiwan Institute of Chemical Engineers, Jun 1, 2016

This paper presents new two electrochemical sensors based on Ag nanoparticles (AgNPs) decorated a... more This paper presents new two electrochemical sensors based on Ag nanoparticles (AgNPs) decorated anchored type ligands, those were prepared based on synthesizing of two amine compounds bounded to silica support, to detect glucose. These compounds were characterized using transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) spectroscopy. TEM monitored AgNPs around 10 nm in size. These electrocatalytic properties of the modified carbon paste electrodes (CPEs) were investigated by electrochemical techniques including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and hydrodynamic amperometry. According to amperometric studies, the better glucose sensor represented the detection range of 28.6 μmol/L to 9.80 mmol/L glucose, with detection limit of 5.5 μmol/L and sensitivity of 540.7 μA/mM. In this work, three human blood serums were employed as real samples with satisfactory results.

Organic preparations and procedures international, Oct 1, 1996

ABSTRACT

Diamond and Related Materials, Apr 1, 2022

Journal of Chemical & Engineering Data, Sep 28, 2018

Vanadium phosphorus oxide (VPO) has been embedded in a titania matrix. The adsorption capacity of... more Vanadium phosphorus oxide (VPO) has been embedded in a titania matrix. The adsorption capacity of the VPO(5−30 wt %)@TiO 2 composites and VPO alone for the removal of harmful cationic and anionic dyes such as methylene blue (MB), rhodamine B (RhB), and methyl orange (MO) have been extensively investigated. The FT-IR, XRD, TGA, FE-SEM, EDX, and BET techniques were applied for characterization of the adsorbents. Batch-adsorption experiments demonstrated that the VPO(30 wt %)@TiO 2 as the best composite selectively removes MB with more than 94% removal efficiency. The adsorption behavior of the MB on the VPO(5−30 wt %)@TiO 2 composites was investigated with variations in the mass of sorbent, initial dye concentration, solution pH, temperature, and contact time. Kinetic experiments demonstrated that the pseudo-second order kinetic model showed the best fit with the adsorption data. The efficiency of the VPO(30 wt %)@TiO 2 as the preferred composite remained unchanged after five adsorption cycles, and could be regenerated easily by simple washing with NaOH (0.1 mol/L) and water.

Applied Catalysis A-general, Aug 1, 2017

Highlights  Dicationic ionic liquids/heteropoly acid composites as heterogeneous catalysts.  Mo... more Highlights  Dicationic ionic liquids/heteropoly acid composites as heterogeneous catalysts.  Molecular oxygen and cyclohexene oxidation under solvent-free conditions.  DIL-L/W composite as the best catalyst and 96% conversion of cyclohexene.  Semi-empirical method and the interaction energy of TPA with DILs.

New Journal of Chemistry, 2019

Chemical Engineering Journal, Aug 1, 2019

Facile and green synthesis of copper nanoparticles loaded on the amorphous carbon nitride for the... more Facile and green synthesis of copper nanoparticles loaded on the amorphous carbon nitride for the oxidation of cyclohexane, Chemical

Social Science Research Network, 2022

Chemical Engineering Science, Mar 1, 2021

Oxo-vanadium (IV) phthalocyanine implanted onto the modified SBA-15 as a catalyst for direct hydr... more Oxo-vanadium (IV) phthalocyanine implanted onto the modified SBA-15 as a catalyst for direct hydroxylation of benzene to phenol in acetonitrile-water medium: a kinetic study, Chemical Engineering Science (2020), doi:

Catalysis Communications, Sep 1, 2016

Abstract To improve the reusability of a modified chitosan supported palladium catalyst (MC-Pd) i... more Abstract To improve the reusability of a modified chitosan supported palladium catalyst (MC-Pd) it was coated with 50 wt% TiO 2 and in this way the MC-Pd@TiO 2 catalyst was prepared. The catalyst was characterized with different techniques. Activity of the catalyst was studied in the Suzuki cross-coupling reactions. The reusability of the catalyst was tested and the results indicated that after 10 runs, in the presence of MC-Pd catalyst the reaction yield decreased to 70% while it was 95% for the coated catalyst. After 10 runs, the Pd leached from MC-Pd catalyst was 20% and for the MC-Pd@TiO 2 catalyst was less than 4%.

Inorganica Chimica Acta, 2019

Copper phthalocyanine as an efficient and reusable heterogeneous catalyst for direct hydroxylatio... more Copper phthalocyanine as an efficient and reusable heterogeneous catalyst for direct hydroxylation of benzene to phenol under mild conditions, Inorganica