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Modeling of Fischer-Tropsch Synthesis in a Slurry Reactor with Water Permeable Membrane

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Journal of Natural Gas Chemistry 2007年第2期16卷 107-114页

作者： fabiano A. N. Fernandes Universidade Federal do Ceara Departamento de Engenharia QuimicaCampus Universitario do PiciBloco 70960455-760 Fortaleza-CEBrazil

Fischer-Tropsch synthesis is an important chemical process for the production of liquid fuels and olefins. In recent years, the abundant availability of natural gas and the increasing demand of olefins, diesel, and waxes have led to a high interest to further develop this process. A mathematical model of a slurry membrane reactor used for syngas polymerization was developed to simulate and compare the maximum yields and operating conditions in the reactor with that in a conventional slurry reactor. The carbon polymerization was studied from a modeling point of view in a slurry reactor with a water permeable membrane and a conventional slurry reactor. Simulation results show that different parameters affect syngas conversion and carbon product distribution, such as the hydrogen to carbon monoxide ratio, and the membrane parameters such as membrane permeance.

关键词： slurry reactor membrane reactor Fischer-Tropsch modeling

Review on the state-of-the-art and challenges in the MgB_(2)component manufacturing for superconducting applications

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Superconductivity 2024年第1期9卷 50-64页

作者： fabiano Carvalho de Castro Sene Department of Industrial and Systems Engineering University of TennesseeKnoxvilleUnited States

Since the discovery of MgB_(2)as a superconductor,several research groups worldwide have studied the superconducting mechanisms due to the dual gap nature of MgB_(2),as well as attempted to produce such a compound in wires,tapes,bulks,and thin films for a plethora of *** MgB_(2)carries the promise of replacing Niobium‐based superconductors in low‐field applications,less‐than‐desirable performance and in‐operation stability has slowed down such a *** the properties and nature of the superconductivity of MgB_(2)are fairly known,the reproduction of its properties at manufacturing scales remains an unsolved ***,this manuscript presents a systematic review on fundamental properties,phase formation,growth kinetics,and superconducting properties of MgB_(2)‐based components such as multi‐and mono‐core wires,bulks,and thin ***,challenges,and shortcomings are utilized in consolidating research questions and directions pertaining to the manufacturing of MgB_(2)superconducting ***,we evaluate the technological readiness of MgB_(2)‐based devices for applications in fusion energy systems.

关键词： MgB_(2) Superconductor manufacturing Technology readiness Review Low‐Field applications

Forecast electricity demand in commercial building with machine learning models to enable demand response programs

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Energy and AI 2022年第1期7卷 18-30页

作者： fabiano Pallonetto Changhong Jin Eleni Mangina School of Computer Science University College DublinIreland School of Business Maynooth UniversityIreland

Electricity load forecasting is an important part of power system *** forecasting electricity load have great impact on a number of departments in power *** to electricity load simulation(white-box model),electricity load forecasting(black-box model)does not require expertise in building *** development cycle of the electricity load forecasting model is much shorter than the design cycle of the electricity load *** developments in machine learning have lead to the creation of models with strong fitting and accuracy to deal with nonlinear *** on the real load dataset,this paper evaluates and compares the two mainstream short-term load forecasting *** the experiment,this paper first enumerates the common methods of short-term load forecasting and explains the principles of Long Short-term Memory Networks(LSTMs)and Support Vector Machines(SVM)used in this ***,based on the characteristics of the electricity load dataset,data pre-processing and feature selection takes *** paper describes the results of a controlled experiment to study the importance of feature *** LSTMs model and SVM model are applied to one-hour ahead load forecasting and one-day ahead peak and valley load *** predictive accuracy of these models are calculated based on the error between the actual and predicted loads,and the runtime of the model is *** results show that the LSTMs model have a higher prediction accuracy when the load data is ***,the overall performance of the SVM model is better when the load data used to train the model is insufficient and the time cost is prioritized.

关键词： Deep neural network Model assessment Short-term load forecasting Feature selection Support Vector Machines Artificial Neural Networks Long Short-term Memory Networks Demand response

A nanostructured look of collagen apatite porosity into human mineralized collagen fibril

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BIOCELL 2022年第10期46卷 2225-2229页

作者： fabiano BINI ANDRADA PICA ANDREA MARINOZZI FRANCO MARINOZZI Department of Mechanical and Aerospace Engineering Sapienza University of RomeRome00184Italy Orthopedy and Traumatology Area Campus Bio-Medico UniversityRome00128Italy

Bone tissue is a hierarchical material characterized at nanoscale by the mineralized collagen fibril,a recurring structure mainly composed of apatite minerals,collagen and *** nanostructure has a fundamental role in determining the mechanical behavior of the tissue and its mass transport *** phenomenon allows to maintain an adequate supply of metabolites in the mechanisms of bone remodeling,adaptation and *** analytical and computational models have been developed to analyze and predict bone tissue ***,the fine replication of the natural tissue still represents a *** on the structural organization at nanoscale and on the influence of apatite mineral crystals on the diffusion coefficient lead to outline the functional conditions for the development of biomimetic strategies for bone tissue *** understanding of bone nanostructure is essential to improve longevity of bioscaffolds and to decrease the risk of failure by controlling their mechanical and biological performance.

关键词： Bone nanostructure Diffusivity Biomimicking Bioscaffolds Tissue engineering

Effect of operating conditions and potassium content on Fischer-Tropsch liquid products produced by potassium-promoted iron catalysts

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Journal of Natural Gas Chemistry 2008年第2期17卷 175-178页

作者： Francisco E.M.Farias Fernando G.Sales fabiano A.N.Fernandes Universidade Federal do Ceará Departamento de Engenharia QuímicaCampus do PiciBloco 70960455-760 Fortaleza-CEBrazil

The dependencies of Fischer-Tropsch synthesis liquid hydrocarbon product distribution on operating pressure and temperature have been studied over three potassium-promoted iron catalysts with increasing potassium molar content. The study followed an experimental planning and the results were analyzed based on surface response methodology. The effects of different operating conditions and potassium contents on the liquid product distribution were compared based on number average carbon number and dispersion. Results showed that high pressures （25 to 30 arm） favored the production of waxes that could be converted into liquid fuels through hydrocracking, while greater direct selectivity towards diesel was favored by low pressure （20 arm） using catalysts with low potassium to iron molar ratios. The liquid product distribution produced using an iron catalyst with high potassium content presented higher number-average number of carbons when compared to the distribution obtained using an iron catalyst with low potassium content.

关键词： Fischer-Tropsch synthesis liquid fuels iron-based catalyst potassium

Bismuth oxide-related photocatalysts in green nanotechnology:A critical analysis

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Frontiers of Chemical Science and Engineering 2018年第4期12卷 878-892页

作者： Andrea P.Reverberi P.S.Varbanov M.Vocciante B.fabiano Department of Chemistry and Industrial Chemistry Genoa University16146 GenoaItaly Pazmany Peter Catholic University Faculty of Information Technology and Bionics1083 BudapestHungary Department of Civil Chemical and Environmental EngineeringPolytechnic SchoolGenoa University16145 GenoaItaly

A survey addressing the uses of bismuth oxide in photocatalysis is presented. The richness of literature on such a specific topic proves the growing importance of this compound as a valid tool in pollution abatement and environmental decontamination. Many research groups have focused their activity on how to improve the photocatalytic properties of this semiconductor and several solutions have been adopted in the synthesis method, often based on wet-chemical processes. The impressive development of nanoscience helped in understanding and identifying process variables and operative conditions aiming at optimizing the yield of this promising photocatalytic material in the utilization of solar energy.

关键词： photocatalysis visible light bismuth compounds nanotechnology environmental remediation decontamination pollution abatement

Ruthenium promotion of Co/SBA-15 catalysts for Fischer-Tropsch synthesis in slurry-phase reactors

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Journal of Natural Gas Chemistry 2012年第6期21卷 722-728页

作者： Jocielys Jovelino Rodrigues Gina Pecchi fabiano AndrNarciso Fernandes Meiry Glucia Freire Rodrigues Federal University of Campina Grande Academic Unit of Chemical Engineering Facultad de Ciencias Químicas Departamento de Físico-QuímicaUniversidad de Concepción Federal University of Ceara Department of Chemical Engineering

The aim of this work was to evaluate the catalytic properties of a Ru promoted Co/SBA-15 catalyst for Fischer-Tropsch synthesis （FTS）. The Ru promoted Co/SBA-15 catalyst was prepared by wet impregnation method and was characterized by X-ray diffraction, X-ray energy dispersion spectrophotometer, N2 adsorption-desorption, temperature-programmed reduction and transmission electron microscopy. The Fischer-Tropsch synthesis using the catalyst was carried out to evaluate the catalyst activity and its effect on FTS product distribution. The synthesis was carried out in a slurry reactor operating at 513 K, 20 atm, CO ： H2 molar ratio of 1 ： 1. X-ray diffraction showed that the calcined cobalt catalyst did not modify the structure of SBA-15, proving that Co was present in the form of Co3O4 in the catalyst. The addition of cobalt in SBA-15 decreased the specific superficial area of the molecular sieve. Fischer-Tropsch synthesis activity and C5＋ hydrocarbon selectivity increased with the addition of Ru. The increases in activity and selectivity were attributed to the increased number of active sites resulting from higher reducibility and the synergetic effect of Ru and Co. Ru/Co/SBA-15 catalysts showed moderate conversion （40%） and high selectivity towards the production of C5＋（80 wt%）.

关键词： SBA-15 cobalt ruthenium heterogeneous catalyst slurry reactor Fischer-Tropsch synthesis

Biochar Increases Diuron Sorption and Reduces the Potential Contamination of Subsurface Water with Diuron in a Sandy Soil

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Pedosphere 2019年第6期29卷 801-809页

作者： fabiano APETTER Tamara SFERREIRA Adilson PSINHORIN Larissa BLIMA Fernandes AALMEIDA Leandro PPACHECO Alexandre FSILVA Universidade Federal de Mato Grosso Instituto de Ciências Agrárias e AmbientaisSinop 78557-267(Brazil Universidade Federal do Piauí Programa de Pós-Graduaçño em AgronomiaBom Jesus 64900-000(Brazil Universidade Federal de Mato Grosso Instituto de Ciencias NaturaisSociais e HumanasSinop 78557-267(Brazil Universidade Federal de Mato Grosso Instituto de Engenharia Agrícola e AmbientalRondonópolis 78735-000(Brazil Embrapa Milho e Sorgo Sete Lagoas 35701-970(Brazil

The herbicide diuron is widely used in agricultural areas in Brazil, whereas it has high potential for subsurface water contamination due to its physicochemical characteristics. Recent studies have demonstrated the potential of biochar as a sorbent and possible pesticide leaching mitigation. The objective of this study was to investigate the long-term effect of biochar application on the kinetics of sorption and desorption of diuron in a Cerrado Haplic Plinthosol. Samples were collected in an experiment conducted in the field in a randomized block design consisting of the combination of two levels of fertilizer application (0 and 300 kg ha −1 of 5-25-15 formula of NPK fertilizers) and three doses of biochar (0, 16, and 32 Mg ha −1 ). The Freundlich isotherm accurately described the sorption of diuron in all treatments. Biochar application increased the sorption and reduced the desorption of diuron. This effect was attributed to the contribution of biochar to total organic carbon (C) and C in the humin fraction and to the increase in the reactivity of the humic acid and humin fractions, which was significantly highly correlated with the sorption coefficient ( K f ). A positive correlation between the partition coefficient of organic C and K f confirmed the importance of the soil organic compartment for the sorption of diuron. The higher diuron sorption and lower diuron desorption capacities of sandy soils after biochar application could reduce the potential risk of diuron leaching and contamination of subsurface water.

关键词： Herbicide Leaching Partition coefficient Persistence Pyrogenic carbon Soil organic matter Sorption coefficient

Additive predictions of aboveground stand biomass in commercial logs and harvest residues for rotation age Pinus radiata plantations in New South Wales,Australia

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Journal of Forestry Research 2021年第6期32卷 2265-2289页

作者： Xixi Qiao Huiquan Bi Yun Li fabiano Ximenes Christopher JWeston Liubov Volkova Mohammad Reza Ghaffariyan School of Information Science and Technology Beijing Forestry UniversityBeijing 100083People’s Republic of China Forest Science NSW Department of Primary Industries–ForestryLevel 314 Parramatta Square12 Darcy StParramattaNSW 2150Australia School of Ecosystem and Forest Sciences Faculty of ScienceThe University of MelbourneWater StreetCreswickVIC 3363Australia Australian Forest Operations Research Alliance(AFORA) University of the Sunshine CoastSippy DownsQLD 4556Australia

Two systems of additive equations were developed to predict aboveground stand level biomass in log products and harvest residue from routinely measured or predicted stand variables for Pinus radiata plantations in New South Wales,*** plantations were managed under three thinning regimes or stand types before clear-felling at rotation age by cut-to-length harvesters to produce sawlogs and *** residue material following a clear-fell operation mainly consisted of stumps,branches and treetops,short off-cut and waste sections due to stem deformity,defects,damage and *** system of equations did not include dummy variables for stand types in the model specification and was intended for more general use in plantations where stand density management regimes were not the same as the stand types in our *** other system that incorporated dummy variables was for stand type-specific *** systems of equations were estimated using 61 plot-based estimates of biomass in commercial logs and residue components that were derived from systems of equations developed in situ for predicting the product and residue biomass of individual *** cater for all practical applications,two sets of parameters were estimated for each system of equations for predicting component and total aboveground stand biomass in fresh and dry weight *** two sets of parameters for the system of equations without dummy variables were jointly estimated to improve statistical efficiency in parameter *** predictive performances of the two systems of equations were benchmarked through a leave-one-plot-out cross validation *** were generally superior to the performance of an alternative two-stage approach that combined an additive system for major components with an allocative system for *** using forest harvest residue biomass for bioenergy has increasingly become an integrated part of forestry,reliable estimates of pro

关键词： Plot-based biomass estimates Wood product Harvest residue Bioenergy Systems of additive and allocative equations Prediction error variance functions