Catalytic hydrogenation of CO_(2)to ethanol is a promising solution to address the greenhouse gas(GHG)emissions,but many current catalysts face efficiency and cost *** based catalysts are frequently examined due to th...
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Catalytic hydrogenation of CO_(2)to ethanol is a promising solution to address the greenhouse gas(GHG)emissions,but many current catalysts face efficiency and cost *** based catalysts are frequently examined due to their abundance,cost-efficiency,and effectiveness in the reaction,where managing the Co^(0)to Co^(δ+)ratio is *** this study,we adjusted support nature(Al_(2)O_(3),MgO-MgAl_(2)O_(4),and MgO)and reduction conditions to optimize this balance of Co^(0)to Co^(δ+)sites on the catalyst surface,enhancing ethanol *** selectivity of ethanol reached 17.9%in a continuous flow fixed bed micro-reactor over 20 mol%Co@MgO-MgAl_(2)O_(4)(CoMgAl)catalyst at 270°C and 3.0 MPa,when reduced at 400°C for 8 *** results coupled with activity analysis confirmed that mild reduction condition(400°C,10%H_(2)balance N_(2),8 h)with intermediate metal support interaction favoured the generation of partially reduced Co sites(Co^(δ+)and Co^(0)sites in single atom)over MgO-MgAl_(2)O_(4)surface,which promoted ethanol synthesis by coupling of dissociative(CHx^(∗))/non-dissociative(CHxO^(∗))intermediates,as confirmed by density functional theory ***,the CoMgAl,affordably prepared through the coprecipitation method,offers a potential alternative for CO_(2)hydrogenation to yield valuable chemicals.
Geldart Group C powders are inherently cohesive due to the strong interparticle forces,leading to severe agglomeration and poor fluidization *** this study,fluidization of nano-modulated Group C particles was investig...
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Geldart Group C powders are inherently cohesive due to the strong interparticle forces,leading to severe agglomeration and poor fluidization *** this study,fluidization of nano-modulated Group C particles was investigated *** particles,also known as Group C+particles,were obtained through the nanoparticle modulation technique,with which a small fraction of nanoparticles were vigorously mixed with Group C particles so that they are adhered to the surface of the much larger Group C *** modification,the cohesiveness of Group C+particle was significantly weakened,and therefore these particles could exhibit much better fluidization ***,the still existing cohesion resulted in the formation of small agglomerates within the *** understand the internal agglomeration mechanisms of Group C+particles and their impact on fluidization behaviors,a new drag model was proposed based on experimental results and the postulation of particle *** numerical results of the cases employing the new drag model agreed well with the experimental data in terms of total and dense phase *** findings revealed the drag mechanism associated with modified Group C particles,contributing to the understanding of ultrafine particle fluidization.
The depletion of fossil fuels and increasing demand for global energy needs suggest the need to explore alternative green, sustainable, and renewable energy sources. Harnessing plastic waste via the pyrolysis techniqu...
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Methylene blue, a widely used dye in various industries, poses significant environmental and health risks when released into water bodies. The experimental methods, while effective for studying the adsorption of dye o...
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The presence of dye contamination in waterbodies has emerged as a widespread environmental issue and poses a significant threat to the well-being of humans and the aquatic ecosystem. Nanotechnology has emerged as a pr...
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Among different natural fibres, Himalayan nettle is gaining importance as reinforcement, an alternative to synthetic fibre, for polymer composite synthesis due to its wide availability, low price, and sustainable prod...
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In our previous study,the activity and stability of the Mo/HZSM-5 catalyst were enhanced by mixing physically with NiO in methane dehydroaromatization(MDA)*** has been confirmed that the physically mixed NiO not only ...
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In our previous study,the activity and stability of the Mo/HZSM-5 catalyst were enhanced by mixing physically with NiO in methane dehydroaromatization(MDA)*** has been confirmed that the physically mixed NiO not only promoted the dispersion of MoC_(x)active sites but also reduced the coke formation on the MoC_(x)owing to the CNTs growth on ***,the promotional effect of NiO was limited when the particle size was reduced,due to the excessive interaction with MoOx(forming NiMoO_(4))which is detrimental to the MoC_(x)*** this study,to overcome the limitation,silica shell on NiO particles with various sizes(5,15,110 nm)was *** catalyst with silica shell coated NiO with the size of 15 nm exhibited a significant improvement in both BTX yield and stability,and the catalyst with silica shell coated NiO with the size of 5 nm achieved the highest maximum BTX yield,about 7.2%.This study demonstrates that the catalytic performance improved as the NiO particle size decreased with the introduction of the silica *** transmission electron microscopy-energy dispersive spectroscopy,X-ray diffraction,temperature-programmed surface reaction of methane,CO chemisorption,visible Raman,and thermogravimetric analysis allowed us to confirm that a thin silica shell further enhances the MoC_(x)dispersion while preventing the formation of Ni-Mo ***,when the size of NiO decreased to 5 nm,CNT growth on Ni was limited during the reaction,which is crucial for reducing coke formation on Mo active sites,thereby resulting in the decreased catalyst stabilization ability of ***,this study indicates that the introduction of a silica shell in a controlled way can significantly enhance the promotional effect of physically mixed NiO on MDA.
This paper presents the performance and behavior of a novel system of integration of an anion exchange membrane (AEM) based water electrolyzer (AEMWE) and fuel cell (AEMFC) with solar photovoltaic (PV) cell and steam ...
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Non-spherical particles are extensively encountered in the process industry such as feedstock or catalysts e.g.,energy,food,pharmaceuticals,and *** design of equipment used to process these particles is highly depende...
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Non-spherical particles are extensively encountered in the process industry such as feedstock or catalysts e.g.,energy,food,pharmaceuticals,and *** design of equipment used to process these particles is highly dependent upon the accurate and reliable modeling of hydrodynamics of particulate media *** coefficient of these particles is the most significant of all parameters.A universal model to predict the drag coefficient of such particles has not yet been developed due to the diversity and complexity of particle shapes and *** this into consideration,we propose a unique approach to model the drag coefficient of non-spherical particles using machine learning(ML)to move towards generalization.A comprehensive database of approximately five thousand data points from reliable experiments and high-resolution simulations was compiled,covering a wide range of *** drag coefficient was modeled as a function of Reynolds number,sphericity,Corey Shape Factor,aspect ratio,volume fraction,and angle of *** ML techniques—Artificial Neural Networks,Random Forest,and AdaBoost—were used to train the *** models demonstrated strong generalization when tested on unseen ***,AdaBoost outperformed the others with the lowest MAPE(20.1%)and MRD(0.069).Additional analysis on excluded data confirmed the robust predictive abilities and generalization of the proposed *** models were also evaluated across three flow regimes—Stokes,transitional,and turbulent—to further assess their generalization.A comparative analysis with well-known empirical correlations,such as Haider and Levenspiel and Chien,showed that all ML models outperformed traditional approaches,with AdaBoost achieving the best *** current work demonstrates that new generated ML techniques can be reliably used to predict drag coefficient of non-spherical particles paving way towards generalization of ML approach.
This study aimed to screen the bacteria from the samples collected from textile dye enriched soil. Twenty-one soil bacteria were isolated and examined for their efficacy for methylene blue (MB) decolourisation. Bacill...
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