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methanol conversion to DmE as a blue fuel：The beneficial use of ultrasonic irradiation for the preparation of CuO/H-mOR nanocatalyst

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燃料化学学报 2014年第11期42卷 1340-1350页

作者： sameh m.k. aboul-fotouh Ain Shams University Faculty of Education Chemistry Department Roxy Cairo 11566 Egypt

methanol conversion to DmE was investigated over CuO /H-mOR nanocatalyst prepared by precipitation and /or by precipitation flowed by ultrasonic irradiation methods. BET,XRD,SEm,NH3-TPD and H2-TPR techniques were used to characterize nanocatalysts. The effective ultrasonication factors encountered during carrying out the dehydration of methanol on Cuo /H-mOR zeolite catalysts to produce dimethylether are studied in the present work. These factors include: the type of ultrasonication media,the ultrasonication time,and the fixed weight of the solid catalyst per the volume of the ultrasonication liquid media( Wcatalyst/ Vliquidratio). XRD showed that structure of H-mOR is not damaged even after it is loaded with CuO nanoparticles or with ultrasonication. H2-TPR profiles indicated that reducibility of sonicated CuO / H-mOR nanocatalyst is higher than non-sonicated catalyst. It is found that employing ultrasound energy for 60 min has the highest influence on the surface properties of nanocatalyst and its catalytic performance( activity and stability) of CuO / H-mOR catalyst. Surface morphology( SEm) of the sonicated CuO /H-mOR catalysts have clarified that methanol by itself used as an ultrasonication medium gives the best results concerning the homogeneity of particle sizes compared to the non-sonicated catalyst,where large agglomerates and non-homogeneous clusters appeared. Water used as a sonication medium showed many large agglomerates in addition to some smaller particles resulted in lowcatalytic activity. The different alcohols and( Wcatalyst/ Vliquid) ratio were examined to give precise correlation with the catalytic activity of the sonicated CuO / H-mOR zeolite catalyst. These findings certified that ultrasonication has a deep effect on the surface morphology and hence on the catalytic behavior of the dehydration of methanol to DmE. NH3-TPD shows that ultrasound irradiation has enhanced the acidity of CuO / H-mOR catalyst and hence it's catalytic performance for

关键词：燃料化学催化原理催化反应

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Effect of ultrasonic irradiation and /or halogenation on the catalytic performance of γ-Al_2O_3 for methanol dehydration to dimethyl ether

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燃料化学学报 2013年第9期41卷 1077-1084页

作者： sameh m.k.aboul-fotouh Ain Shams University Faculty of EducationChemistry DepartmentRoxyCairo 11566Egypt

Dimethyl ether(DmE) is amongst one of the most promising alternative,renewable and clean fuels being considered as a future energy *** this study,the comparative catalytic performance of the halogenated γ-Al 2 O 3 prepared from two halogen precursors(ammonium chloride and ammonium fluoride) is *** impact of ultrasonic irradiation was evaluated in order to optimize both the halogen precursor for the production of DmE from methanol in a fixed bed *** catalysts were characterized by SEm,XRD,BET and NH *** reaction conditions where the temperature ranged from 200 to 400 ℃ with a WHSV = 15.9 h-1was found that the halogenated catalysts showed higher activity at all reaction ***,the halogenated alumina catalysts prepared under the effect of ultrasonic irradiation showed higher performance of γ-Al 2 O 3 for DmE *** chlorinated γ-Al 2 O 3 catalysts showed a higher activity and selectivity for DmE production than fluorinated versions.

关键词：化学原理方法化学动力学

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Production of dimethylether(DmE) as a clean fuel using sonochemically prepared CuO and /or ZnO- modified γ- alumina catalysts

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燃料化学学报 2014年第3期42卷 350-356页

作者： sameh m.k.aboul-fotouh Ain Shams University Faculty of EducationChemistry Department

The catalytic conversion of methanol to dimethylether(DmE)was studied over CuO/Al2O3,ZnO/Al2O3and ZnOCuO/Al2O3nanocatalysts prepared in presence or absence of ultrasonic *** catalysts were characterized by X-ray diffraction(XRD),surface characterization method(BET),scanning electron microscope(SEm),H2-temperature programmed reduction(H2-TPR)and temperature programmed desorption of ammonia(NH3-TPD).The experimental results show that during catalytic dehydration of methanol to dimethylether,the activities of the CuO/Al2O3,ZnO/Al2O3and ZnO-CuO/Al2O3catalysts prepared using ultrasonic treatment are much higher than those prepared in absence of *** shows that the use of ultrasonication results in much smaller *** and XRD show that the ultrasonication increases the surface area and pore volume of the catalysts.H2-TPR profiles indicated that reducibility of the sonicated nanocatalysts is carried out at lower ***3-TPD shows that ultrasound irradiation has enhanced the acidity of the nanocatalyst and hence enhanced catalytic performance for DmE formation.

关键词： DmE 燃料化学氧化铜氧化锌

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Dimethylether production on zeolite catalysts activated by Cl^-,F^- and / or ultrasonication

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燃料化学学报 2016年第4期44卷 428-436页

作者： sameh m.k.aboul-fotouh Noha A.k.aboul-Gheit mona A.Naghmash Chemistry Department Faculty of Education Ain Shams University Roxy Cairo 11757 Egypt Faculty of Science Chemistry Department Northern Border University Arar 91431 Kingdom of Saudi Arabia Egyptian Petroleum Research Institute Cairo 11787 Egypt

The chlorinated and fluorinated zeolite catalysts were prepared by the impregnation of zeolites( H-ZSm-5,H-mOR or H-Y) using two halogen precursors( ammonium chloride and ammonium fluoride) in this study. The influence of ultrasonic irradiation was evaluated for optimizing both halogen precursors for production of dimethylether( DmE) via methanol dehydration in a fixed bed reactor. The catalysts were characterized by SEm,XRD,BET and NH3-TPD. The reaction conditions were temperatures from 100 to 300 ℃ and a WHSV = 15. 9 h-1. All halogenated catalysts showhigher catalytic activities at all reaction temperatures studied. However, the halogenated zeolite catalysts prepared under ultrasonic irradiation showhigher performance for DmE formation. The chlorinated zeolite catalysts show higher activity and selectivity for DmE production than the respective fluorinated versions.

关键词： ultrasonication DmE zeolite Cl^- F^-

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Effect of the Si/Al ratio of HZSm-5 zeolite on the production of dimethyl ether before and after ultrasonication

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燃料化学学报 2017年第5期45卷 581-588页

作者： sameh m.k.aboul-fotouh Laila I.Ali mona A.Naghmash Noha A.k.aboul-Gheit Chemistry Department Faculty of ScienceNorthern Boder UniversityArar 91431Kingdom of Saudi Arabia Chemistry Department Faculty of EducationAin Shams UniversityRoxyCairo 11757Egypt Egyptian Petroleum Research Institute Nasr CityCairo 11787Egypt

A series of as-synthesized HZSm-5 zeolites with different Si/Al ratios(25,90,120,240 and 400)were post-treated by ultrasonication for an optimum time of 60 *** morphology,acidity and textural properties of HZSm-5 were characterized with XRD,SEm,N_2 adsorption and NH3-TPD *** catalytic performance was evaluated by dehydration of methanol to dimethyl ether(DmE),which is a promising gaseous automotive fuel in *** was found that the Si/Al ratio of HZSm-5 had considerable impacts on its catalytic performance for dehydration of methanol to *** activity increased with decreasing Si/Al ratio from 400 to *** of HZSm-5 could significantly improve its catalytic performance.

关键词： Ultrasonication-HZSm-5-dimethyl ether-Si/Al 比率

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PtRe/H-ZSm-5的氢卤化对环己烯转化的影响(英文)

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催化学报 2012年第4期33卷 697-705页

作者： sameh m.k.aboul-fotouh Noha A.k.aboul-GHEIT Chemistry Department Faculty of EducationAin-Shams University Process Development Department Egyptian Petroleum Research Institute

Extended use of supported Pt catalysts causes thermal migration of Pt particles to form large agglomerates,thus decreasing the catalytic *** combination of Pt with Re protects Pt against *** addition,Cl injection into the reactor assists Pt particles redispersion to prolong catalyst *** this work,a PtRe/H-ZSm-5 catalyst was treated with either HCl or HF to investigate their role in activating or deactivating the *** conversion exceeded 90% in the whole temperature range with the PtRe/H-ZSm-5(HCl) catalyst,and its activity for the direct isomerization of cyclohexene to methylcyclopentenes(mCPEs) was the lowest but the activity for the hydrogenation of the mCPEs to methylcyclopentane was the *** reactivities of mCPEs and cyclohexadienes on the catalysts were similar because both are dehydrogenation *** production was significantly higher on the hydrochlorinated catalyst than on the other catalysts,and its hydrocracking activity was the lowest,which is a good characteristic for processing catalysts where cracking is undesired.

关键词：化学催化高压高温

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Conversion of methanol Using modified H-mOR Zeolite Catalysts

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催化学报 2011年第3期32卷 412-417页

作者： sameh m. k. aboul-fotouh Noha A. k. aboul-GHEIT marwa m. I. HASSAN ChemistryDepartment FacultyofEducationAin—ShamsUniversityRoxyCairoEgypt ProcessDevelopmentDepartment EgyptianPetroleumResearchInstituteCairoEgypt

甲醇的变换在各种各样的 mordenite 沸石催化剂上被执行评估他们的催化表演。由有 NH4Cl 或 NH4F 的 halogenation 并且由有 HCl 或 HF 的 hydrohalogenation 的 H 粗腐殖质催化剂的一个准备以后的处理被执行并且它在 100300

关键词：催化燃烧高压化学理论

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Experimental Investigation of Upgraded Diesel Fuel with Copper Oxide Nanoparticles on Performance and Emissions Characteristics of Diesel Engine

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Journal of Energy and Power Engineering 2017年第8期11卷 541-552页

作者： Sherry khulief Tarek m. aboul-fotouh Department of Chemical Engineering Faculty of Engineering the British University in Egypt (BUE) El-Shorouq City Cairo 11837 Egypt mining and Petroleum Engineering Department Faculty of Engineering Al-Azhar University Nasr City Cairo 11884 Egypt

The enhancement of the physicochemical characteristics of fossil fuel has been the subject of extensive research to achieve better efficiency and reduced emissions. Diesel is one of the fossil fuels that are highly consumed in daily life. This paper focuses on the behavior of a refined diesel fuel when copper oxide nanoparticles are added. The resulting blend ofnano-diesel has been analyzed using a four-stroke engine under two loads indicating light vehicles and heavy duty vehicles. The nano-diesel was prepared by the aid of an ultrasonicator and a mechanical homogenizer. A base diesel was taken as a reference to distinguish the effect of the nanoparticles additives. Three different samples with different concentrations are utilized in this study. As a result, the fuel consumption, exhaust temperature, brake power, power losses and engine efficiency have been evaluated and compared to the base diesel in order to demonstrate and access the enhanced performance of the nano-fuel blend. The three concentrations conducted were 100 ppm, 200 ppm and 300 ppm of copper oxide nanoparticles. The results represented that the pure refinery diesel has low exhaust temperatures, high brake power and high efficiency as compared to the commercial diesel supplied from a gas station. In addition, 300 ppm copper oxide nano-diesel showed improvement in engine performances as compared to the other concentrations and pure diesel. In this context, lowest fuel consumption for both passenger cars and heavy duty vehicles was achieved, brake power for passenger cars only was improved and input power showed improvement however, exhaust temperature was the highest as for this fuel.

关键词： Diesel fuel copper oxide nanoparticles bio-diesel additives.

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Right Axillary Thoracotomy Should Be the Standard of Care for Repair of Non-Complex Congenital Heart Defects in Infants and Children

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Congenital Heart Disease 2024年第4期19卷 407-417页

作者： sameh m.Said Yasin Essa Division of Pediatric and Adult Congenital Cardiac Surgery Department of SurgeryMaria Fareri Children’s HospitalWestchester Medical CenterNew York Medical CollegeNew YorkNY 10595USA Department of Cardiothoracic Surgery Faculty of MedicineAlexandria UniversityAlexandria5372066Egypt

minimally invasive approaches for cardiac surgery in children have been lagging in comparison to the adult world.A wide range of the most common congenital heart defects in infants and children can be repaired suc-cessfully through a variety of non-sternotomy *** has been shown to be associated with superior cos-metic results,shorter hospital stays,and rapid return to full activity compared to *** approaches have been around for decades,but they have not been widely adopted for a variety of *** axillary thor-acotomy is one of these approaches that we believe should be the new standard for the repair of a wide variety of heart defects in children and will be the focus of our current review.

关键词： minimally invasive repair congenital heart disease right axillary thoracotomy atrial septal defect ventricular septal defect enhanced recovery

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A Hybrid model for Reliability Aware and Energy-Efficiency in multicore Systems

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Computers, materials & Continua 2022年第3期70卷 4447-4466页

作者： Samar Nour sameh A.Salem Shahira m.Habashy Department of Computer and Systems Engineering Faculty of EngineeringHelwan UniversityCairo11792Egypt Egyptian Computer Emergency Readiness Team(EG-CERT) National Telecom Regulatory Authority(NTRA)Cairo12577Egypt

Recently,multicore systems use Dynamic Voltage/Frequency Scaling(DV/FS)technology to allow the cores to operate with various voltage and/or frequencies than other cores to save power and enhance the *** this paper,an effective and reliable hybridmodel to reduce the energy and m.k.span in multicore systems is *** proposed hybrid model enhances and integrates the greedy approach with dynamic programming to achieve optimal Voltage/Frequency(Vmin/F)***,the allocation process is applied based on the *** hybrid model consists of three *** first stage gets the optimum safe voltage while the second stage sets the level of energy efficiency,and finally,the third is the allocation *** results on various benchmarks show that the proposed model can generate optimal solutions to save energy while minimizing the m.k.span *** with other competitive algorithms show that the proposed model provides on average 48%improvements in energy-saving and achieves an 18%reduction in computation time while ensuring a high degree of system reliability.

关键词： Energy-efficiency safe voltage multicore processors core utilization dynamic voltage/frequency scaling m.k.span

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