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RISS 인기검색어
- 검색키워드
- 저자 : Yasin Orooji (검색결과 4 건)
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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.
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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.
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Parisa Yekan Motlagh,Alireza Khataee,Aydin Hassani,Yasin Orooji 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Exfoliation of bulk hematite (a-Fe2O3), as an environmentally friendly, nontoxicity, and low-cost semiconductoroxide, exhibited greater photocatalytic activity under visible light irradiation. Herein, wedescribed two preparation methods of novel two-dimensional non-van der Waals hematene (2D-Hm)nanosheets including ultrasound-assisted liquid-phase exfoliation (US-Hm) and chemical-assistedliquid-phase exfoliation (CH-Hm). The photocatalytic activity of 2D-Hm nanosheets was evaluated forthe decomposition of Tetracycline (TC). Various advanced analyses were used to investigate the physicaland chemical properties of the exfoliated samples. SEM and TEM analyses confirmed the layered structuresof 2D-Hm. The crystalline structure of 2D-Hm samples was confirmed successfully by XRD analyses. After exfoliation of bulk hematite, the surface area increased remarkably from 5.73 m2/g to 24.16, and15.26 m2/g using US-Hm, and CH-Hm exfoliation methods, respectively. The photoelectrochemical photocurrentand electrochemical impedance spectroscopy (EIS) analysis indicate that 2D-Hm samples havehigher charge-transfer efficiency than bulk hematite. Additionally, the formation of hydroxyl (OH) radicalswas approved using the o-phenylenediamine (OPD) and photoluminescence (PL) analysis. The leachingiron concentration in the aqueous phase was measured within five consecutive examinations. Torecognize the intermediates formed during the degradation process, gas chromatography-mass spectrometry(GC–MS) was employed.
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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.
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