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RISS 인기검색어
- 검색키워드
- 저자 : Samahe Sadjadi (검색결과 5 건)
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Samahe Sadjadi,Vahid Farzaneh,Samira Shirvani,Mohammad Ghashghaee 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3
This article presents the effects of three copper precursors and four precipitating agents on the catalytic performance of the corresponding co-precipitated Cu-MgO catalysts in the vapor-phase hydrogenation of furfural. The chemical and physical properties were analyzed by means of XRD, BET, SEM, and EDX techniques. The nitrate precursor provided the highest performance (conversion of ~89%). Whereas, the catalyst prepared with NaOH was the most efficient (furfuryl alcohol yield of >90%) during 240min; the most durable conversion (~95%) was assured with Na2- CO3, and the highest selectivity to furfuryl alcohol (>97%) was achieved with K2CO3 as the precipitating agent. The least efficient catalyst (prepared with ammonium carbonate) led to 5-methylfurfural and 2,2-methylenebisfuran as the main byproducts. The major byproducts over the rest of the catalysts included tetrahydrofurfuryl alcohol, furfuryl ether, 1-pentanol, and 2-methylfuran. An increasing trend of furfuryl alcohol selectivity with time-on-stream was evident for all of the catalysts.
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Asadi Zahra,Sadjadi Samahe,Bahri-Laleh Naeimeh,Nekoomanesh-Haghighi Mehdi 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.3
To furnish high-quality poly-alpha-olefi n oils, hydro-fi nishing under mild reaction conditions by a novel heterogeneous catalyst was accomplished. In this regard, Pd nanoparticles were immobilized on Boehmite. Then, the eff ect of hydrogenation variables, i.e., catalytic loading, reaction pressure, and temperature on the catalytic effi ciency, was investigated with response surface method. According to the results, a hydrogenation effi ciency of 85% was obtained at the optimum reaction conditions of T = 130 °C, P = 8 bar, and catalyst dosage = 5 wt%. Notably, the catalyst was recyclable for four runs with insignifi cant leaching of palladium nanoparticles. The comparison results suggested Pd/Boehmite catalyst as an appropriate alternative to the commercial Pd/Alumina and Pd/Silica. Hot fi ltration test also approved heterogeneous nature of catalysis.
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Sahar Karimi,Naeimeh Bahri-Laleh,Gerard Pareras,Samahe Sadjadi,Mehdi Nekoomanesh-Haghighi,Albert Poater 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Considering the importance of hydrofinishing of poly alpha-olefin oils from the industrial point of view,in this research both computational and experimental studies have been exploited for developing anenvironmentally benign and sustainable protocol for this process. To this purpose, it was decided tofabricate a novel nanocomposite by using a natural clay, halloysite, and multi-nitrogen containingpolymer derived from low cost and available raw-materials. Tofind the optimum polymeric moiety forconjugating with halloysite, computational study was applied. In this regard and to design a propersupport, the combination of 2,4,6-trichloro-1,3,5-triazine with a library containing 9 diamine compoundswas taken into account. Computational results revealed the eligibility of propanediamine among theseries toward gripping Pd nanoparticles as the catalytic active site. Using these data, the optimumcomposite was fabricated and palladated. Investigation of the performance of the resulting catalystapproved its excellent activity under very mild reaction conditions and recyclability up to six consecutiveruns with insignificant Pd leaching and loss of activity. The results collected from this combined studyaffirmed that the present protocol is a green and sustainable methodology with potential for large scaleapplications.
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Pooya Jalal Sahandi,Mohammad Kazemeini,Samahe Sadjadi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
Hand in hand with the flourish of the biodiesel industry, glycerol (GLY) as an inconvenient by-product hasgenerated environmental and sustainability concerns. Devising measures for efficient transformation ofGLY into value-added products is a promising solution. In this contribution, the transformation of GLYto lactic acid (LA) as a valuable chemical was investigated in a continuous process for industrial applications. In this regard, a catalytic method using heterogeneous Cu nanoparticles in NaOH solution was studiedin a microreactor by a CFD simulation. A seven-inlet micromixer comprising an optimized mixing unitwas incorporated for uniform distribution of the species. The effects of various parameters upon the processperformance were considered and the optimum points were determined. Also, the extent of theinfluence of each variable on LA yield was evaluated using sensitivity analysis techniques. While higherLA yield could be obtained at extreme scenarios, optimum values of the Re and temperature for obtainingthe maximum performance under sensible operating conditions were determined to be 0.108 and 510.1 Kwhich led to the optimum yields of 67.8% and 59.5%, respectively. Moreover, the sensitivity analysisrevealed that the molar ratio of OH /GLY and temperature were the most and least significant parameters,respectively.
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Arash Shams,Mohammadreza Mehdizadeh,HamidReza Teimoury,Mehrsa Emami,Seyed Amin Mirmohammadi,Samahe Sadjadi,Eduard Bardají,Albert Poater,Naeimeh Bahri-Laleh 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The role of the pore architecture of the Ziegler-Natta (ZN) catalysts in the propylene polymerizations isunveiled, towards the catalyst activity, H2– and comonomer-response, and final properties of the synthesizedpolymer. In this regard, two commercially available ZN catalysts (Cat-A and Cat-B belong to the 4thgeneration, containing diisobutyl phthalate as internal donor) with a similar composition but with differentpore structures were employed in propylene/1-hexene copolymerizations in the presence of H2 as achain transfer agent. Although pore diameter does not alter H2-response noticeably, it significantly affectsthe comonomer incorporation as well as the distribution of the isotactic sequence length in the copolymerbackbone. Cat-A with a lower surface area, a larger pore diameter, and a wider inlet showed slightlyhigher activities in homopolymerization and copolymerization experiments. According to the selfnucleationand annealing (SSA) results, the copolymer produced from Cat-A demonstrated lower isotacticsequence length and lamellar thickness contents owing to its larger pore diameter with wider inlets. Moreover, Temperature Rising Elution Fractionation (TREF) profiles asserted SSA data in which thecopolymer from Cat-A represented a higher content of low elution temperatures fractions, due to itshigher comonomer content. These findings will lead to catalysts for different polypropylene grades.
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