Hydrogen production through methane reforming processes using promoted-Ni/mesoporous silica: A review

Zahra Taherian,Alireza Khataee,Ning Han,Yasin Orooji 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-

The catalyst’s performance for hydrogen production is strongly dependent on the proper selection ofactive metals, supports, and promoters. Nickel catalysts can also be a strong and cost-effective succession. Mesoporous supports containing basic sites on the surface are able to suppress carbon deposition andgreater stability to the catalyst. Therefore, in this short review, we focus on hydrogen production throughreforming processes especially steam and dry reforming and the nickel catalysts’ performance for hydrogenproduction. Particularly focusing on effective parameters including mesoporous supports (SBA-15,MCM-41, KIT, and SBA-16) and promoters. Since the trapping of active metals into the MCM-41mesostructure with smaller pores makes them appreciated for catalytic applications, therefore we highlightthe recent literature achievements on DRM by promoted/unpromoted Ni catalysts over MCM-41support for hydrogen production. In this review, attention will be given to different catalyst particles sizeand the effect of metal dispersion on mesoporous silica supports for enhancing catalytic activities in acomprehensive and comparative manner.

Anti-coking freeze-dried NiMgAl catalysts for dry and steam reforming of methane

Zahra Taherian,Vahid Shahed Gharahshiran,Alireza Khataee,Yasin Orooji 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

Finding supported nickel catalysts with high activity and stability is yet a challenging aim for industrialapplications. In this work, we synthesized a surface defect-promoted Ni catalyst supported on Mg/Alhydrotalcite via a freeze-dried method instead of calcination. This approach leads to the increase in oxygenvacancies, which is attributed to the high dispersion of active sites after adding samarium. X-raydiffraction (XRD) measurements demonstrate a homogeneous layered double hydroxide (LDH) structurewithout the formation of any oxides. High-resolution transmission electron microscopy (HR-TEM) andfield emission scanning electron microscopy images (FE-SEM) illustrated that the samarium-promotedNiMgAl catalyst possesses a scaffold structure with surface defects and oxygen vacancies compared tothe unpromoted NiMgAl catalyst which confirmed by X-ray photoelectron spectroscopy (XPS). Moreover, the impact of the samarium incorporation on the physicochemical features of NiMgAl catalystswas investigated for catalytic activity in dry and steam reforming of methane at 700 C. NiMgAl-Sm catalystshowed the highest conversion of CH4 (72%) and stability without any carbon formation during 20 hof time on stream in dry reforming process. because the strong metal–support interaction inhibits thesintering of nanocatalysts at 700 C and the scaffold structure increases the mass transportation of feedstockand products.

Encapsulation of Frankincense Essential Oil by Microfluidic and Bulk Approaches: A Comparative Study

Pouria Taherian,Mohammad Sadegh Nourbakhsh,Ali Abouei Mehrizi,Mohadeseh Hashemi 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10

Herbs and hand-made herbal remedies have been long used for disease control, treatment, and healthimprovement. Evidence suggests that a single herb's compounds can have synergistic functions with probably no adverseeffect. Unfortunately, the traditional administration of essential oil (EO) does not follow a regulatory dose regimen, causingreduced bioavailability due to EO evaporation or denaturation in harsh biological environments. Hence, encapsulation canhelp enhance EO stability and dose dependence. Here, chitosan nanoparticles (ChNPs) were used to encapsulate frankincenseessential oil (FEO) to preserve its remarkable therapeutic effects. Also, traditional bulk preparation methods were comparedwith microfluidic with central aqueous stream configuration (CAS). The results indicated the higher quality of microfluidicbasednanoparticles with uniform, spherical, and separated morphologies. The size of bulk and microfluidic nanoparticlesranged from 86 to 118 nm, the surface charge varied from 12.5 to 19.5 for different amounts of FEO, and the as-preparedcolloid remained stable for three days. Narrow size distribution (PDI0.28) and high encapsulation efficiency (EE99 %)were achieved using the microfluidic process compared to the bulk method (PDI=0.74, EE90 %). The microfluidicnanoparticle also indicated a burst release rate greater than the bulk method (30 %). It was concluded that the highperformancemicrofluidic approach provided higher quality and more control over nanoparticle properties.

Surface-Treated Biocompatible ZnS Quantum Dots: Synthesis, Photo-Physical and Microstructural Properties

M. Taherian,A.A. Sabbagh Alvani,M. A. Shokrgozar,R. Salimi,S. Moosakhani,H. Sameie,F. Tabatabaee 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2

In the present study, the ZnS semiconductor quantum dots were successfully synthesized via an aqueous method utilizing glutathione (GSH), thioglycolic acid (TGA) and polyvinyl pyrrolidone (PVP) as capping agents. The structural, morphological and photo-physical properties and biocompatibility were investigated using comprehensive characterization techniques such as x-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), dynamic light scattering (DLS), Fourier transform infrared spectrometry (FT-IR), UVVis optical absorption, photoluminescence (PL) spectrometer and MTT assay. The XRD patterns showed a cubic zinc blende crystal structure and a crystallite size of about 2 - 3 nm using Scherrer’s equation confirmed by the electron micrographs and Effective Mass Approximation (EMA). The DLS and zeta-potential results revealed that GSH capped ZnS nanoparticles have the narrowest size distribution with an average size of 27 nm and relatively good colloidal stability. Also, the FT-IR spectrum confirmed the interaction of the capping agent groups with ZnS nanoparticles. According to the UV-Vis absorption results, optical bandgap of the spherical capped nanoparticles is higher compared to the uncapped sample and could be wider than 3.67 eV (corresponding to the bulk ZnS), which is due to the quantum confinement effect. From photoluminescence spectra, it was found that the emission becomes more intensive and shifts towards the shorter wavelengths in the presence of the capping agent. Moreover, the emission mechanism of uncapped and capped ZnS was discussed in detail. Finally, the MTT results revealed the satisfactory (>94%) biocompatibility of GSH capped ZnS quantum dots which would be a promising candidate applicable in fluorescent biological labels.

Noise Resistant Identification of Human Iris Patterns Using Fuzzy ARTMAP Neural Network

Arash Taherian,Mahdi Aliyari Sh. 보안공학연구지원센터 2013 International Journal of Security and Its Applicat Vol.7 No.1

핫산 타헤리안 주한 이란대사 특별기고 : 핵 타결은 윈-윈 협상 이란과 한국의 새로운 협력 기대

핫산타헤리안 ( Hassan Taherian ) 포스코경영연구소 2015 CHINDIA Plus Vol.108 No.-

Samarium-impregnated nickel catalysts over SBA-15 in steam reforming of CH4 process

Gharahshiran Vahid Shahed,Zahra Taherian,Alireza Khataee,Fereshteh Meshkani,Yasin Orooji 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-

Promoted Ni/SBA-15 catalysts with varying amounts of Sm promoter (0.5, 1.5, 3 and 6 wt.%) wereprepared and employed in steam reforming of methane (SRM) process. The catalysts were synthesized bya two-solvent impregnation method and characterized by low and high angles XRD, BET, TPO, TEM, ED,and FE-SEM techniques. The results demonstrated that increasing in Sm content from 0.5 to 3 wt.%diminished the specific surface area of catalysts from 504 to 371 m2/g and decreased the average nickelcrystallite size from 31 to 12 nm. The catalytic results exhibited that adding Sm promoter enhanced thecatalytic activity from 31% in unprompted catalyst to 70% for 3 wt.% Sm-promoted catalyst. Also, thecatalyst with 3 wt.% of Sm possessed the highest H2 production yield, about 66%. In addition, the TPO,TEM and ED tests revealed the formation of carbon with nanotube nature on the catalyst surface.

Performance Analysis of a High-Speed All-Optical Subtractor using a Quantum-Dot Semiconductor Optical Amplifier-Based Mach-Zehnder Interferometer

Mohammad Reza Salehi,Seyed Farhad Taherian 한국광학회 2014 Current Optics and Photonics Vol.18 No.1

This paper presents the simulation and design of an all-optical subtractor using a quantum-dot semiconductor optical amplifier Mach-Zehnder interferometer (QD-SOA MZI) structure consisting of two cascaded switches, the first of which produces the differential bit. Then the second switch produces the borrow bit by using the output of the first switch and the subtrahend data stream. Simulation results were obtained by solving the rate equations of the QD-SOA. The effects of QD-SOA length, peak power and current density have been investigated. The designed gate can operate at speeds of over 250 Gb/s. The simulation results demonstrate a high extinction ratio and a clear and wide-opening eye diagram.

Differential Expression of HSP90β in MDA-MB-231 and MCF-7 Cell Lines after Treatment with Doxorubicin

Jokar, Fereshte,Mahabadi, Javad Amini,Salimian, Morteza,Taherian, Aliakbar,Hayat, Seyyed Mohammad Gheibi,Sahebkar, Amirhossein,Atlasi, Mohammad Ali KOREAN PHARMACOPUNCTURE INSTITUTE 2019 Journal of pharmacopuncture Vol.22 No.1

Background: Breast cancer is a complex, heterogeneous disease and one of the most common malignancies in women worldwide. The efficacy of chemotherapy as an important breast cancer treatment option has been severely limited because of the inherent or acquired resistance of cancer cells. The molecular chaperone heat shock protein 90 (HSP90) upregulated in response to cellular stress is required for functions such as conformational maturation, activation and stability in more than 200 client proteins, mostly of the signaling type. In this study, the expression of HSP90 isoforms including $HSP90{\alpha}$ and $HSP90{\beta}$ in breast cancer cell lines before and after treatment with doxorubicin (DOX) was assessed. Material and Methods: The cell cytotoxicity of DOX in MDA-MB-231 and MCF-7 cell lines was determined using the MTT assay. immunofluorescence and western blotting techniques were used to determine the expression of $HSP90{\beta}$ in the cell lines before and after DOX treatment. Immunofluorescence was also conducted to ascertain the expression of $HSP90{\alpha}$. Results: The MTT assay results showed that the MDA-MB-231 cells ($IC_{50}=14.521{\mu}M$) were more sensitive than the MCF-7 cells ($IC_{50}=16.3315{\mu}M$) to DOX. The immunofluorescence results indicated that the expression of $HSP90{\alpha}$ in both cell lines decreased after exposure to DOX. The western blot and immunofluorescence analyses showed that $HSP90{\beta}$ expression decreased in the MCF-7 cells but increased in the MDA-MB-231 cells after DOX treatment. Conclusion: The obtained results suggested that $HSP90{\alpha}$ and $HSP90{\beta}$ expression levels were reduced in the MCF-7 cells after exposure to DOX. In the MDA-MB-231 cells, $HSP90{\alpha}$ expression was reduced while $HSP90{\beta}$ was found to be overexpressed following DOX treatment.

Accumulation and remobilization of assimilates in different genotypes of durum wheat under terminal drought stress

Vosoghi Rad Mehdi,Jami Moeini Matin,Taherian Majid,Armin Mohammad 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.2

The present research was conducted to examine the accumulation and remobilization of some promising lines of durum wheat assimilates using a randomized complete block design. In this regard, two experimental groups of stress and normal (no stress) with three replications were compared during two crop years. The analysis of the results included measuring the accumulation and remobilization rates of assimilates using the weighting method as well as investigating the relationship between internode characteristics (length and specifc weight) and dry matter accumulation. The obtained results were indicative of a signifcant diference among various genotypes considering the contribution of diferent internodes to the stem length under normal and stress conditions. In all genotypes, the peduncle internode had the largest contribution to the stem height. Under both conditions, the lower internodes had the highest remobilization as well as dry and specifc weights. The highest rate of remobilization from the lower internodes was detected in G2 genotype under normal and G7, G18, and G6 genotypes under stress conditions. Moreover, the highest remobilization efciency from the lower internodes was observed in G7 and G18 genotypes under stress conditions. The obtained results were indicative of two diferent mechanisms of storage capacity and remobilization ability. As observed, the G14 line was one of the genotypes that revealed the highest specifc weight of peduncle while the rate of remobilization was the lowest in response to stress conditions. The highest rates for the specifc weight of the lower internodes with the lowest rates of remobilization were observed in G4 and G8 lines. According to the results, the wide variation for the accumulation and remobilization of assimilates among the durum wheat genotypes can pave the way for possible trait changes in breeding programs.