نتایج جستجو برای: nb2o5
تعداد نتایج: 543 فیلتر نتایج به سال:
Sr5Nb4O15 – Nb2O5 nanocomposites were synthesized in 2 and 4 M KOH aqueous solutions, via a non-stoichiometric 1:2 Sr:Nb molar ratio hydrothermal method at 160°C for 48 h (S1 and S2, respectively). Sr(NO3)2 and Nb2O5 were used as raw materials. The synthesized nanomaterials were characterized by powder X-Ray diffraction (PXRD) technique. It was found that Sr5Nb4O15 has been crystallized in hexa...
The Nb2O5-Ni coating was processed using DC sputtering on structural steel and study characterization of composite SEM/EDS inspection indicated clearly perfect incorporation Nb2O5 within the nickel rich. Increasing in surface roughness decreasing average diameters particles were obtained for coated compared with uncoated from AFM analysis, addition, microhardness test thickness showed that incr...
شیشههای پایه بوراتی PbO-B2O3 La2O3- و Nb2O5 در ساخت ابزار فوتونیک، اوپتوالکترونیک، نیمه آینهها، انامل، پوششها یا لعابهای براق و آویزهای شیشهای با خواص انعکاسی بالا برای تزیینات خانگی و غیره، کاربرد فراوان دارند. هدف از به کارگیری این نوع شیشهها به عنوان لعاب پایه، نیل به خواص نوری ویژه نظیر ضریب شکست بالا و خواص تجزیه نوری پایین میباشد. در این تحقیق ابتدا، شیشهساز قوی B2O3، با مقادیر با...
The decomposition of the Ethiopian Kenticha tantalite ore was studied using the KOH fusion and H2O leaching system at 400 0C for a 1 h reaction time. The experimental results obtained showed that 27 wt% of Ta2O5 was mainly transformed into insoluble KTaO3, not to be KNbO3, and as well, into the dissolved liquor containing 94.73 vol% of Nb2O5 and 75.80 vol% of Ta2O5. The observations, supported ...
5-Hydroxymethylfurfural (HMF) is one of the most important lignocellulosic biomass-derived platform molecules for production renewable fuel additives, liquid hydrocarbon fuels, and value-added chemicals. The present work developed niobium oxides (Nb2O5) supported on mesoporous carbon/silica nanocomposite (MCS), as novel solid base catalyst synthesis HMF via one-pot glucose conversion in a bipha...
Ti- and Nb- containing NiO catalysts have been synthesized by two different preparation methods: i) precipitation (Me-Ni-O oxides, Me = Nb or Ti), in order to prepare promoted catalysts; ii) wet impregnation on TiO2 NbOx supports, diluted/supported catalysts. The also characterized tested the oxidative dehydrogenation of ethane. catalytic performance Nb-promoted strongly depends composition, al...
ذخیره هیدروژن برای فناوری پیل سوختی از اهمیت بسزایی برخوردار است. منیزیم از جمله مواد ذخیره ساز هیدروژن به صورت جامد است که در سال های اخیر به علت ظرفیت بالای ذخیره هیدروژن، قیمت مناسب و فراوانی در طبیعت، بسیار مورد توجه قرار گرفته است، ولی هیدرید شدن منیزیم (هیدروژناسیون) به آهستگی انجام می شود و به دمای بالایی نیز نیاز دارد. تحقیقات زیادی برای رفع این معایب انجام شده است. هدف از انجام این پژو...
In this study, ZnO/TiO2 and ZnO/Nb2O5 photocatalysts were evaluated in the river pollution remediation wastewater treatment from textile factories, thus, target pollutants selected for study enteropathogenic bacteria commercial dyes. The mixed oxide systems extensively analyzed order to explore their physicochemical properties. From analysis, it was found that coupling of two oxides did not mod...
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