نتایج جستجو برای: sba 15 اصلاح شده
تعداد نتایج: 941455 فیلتر نتایج به سال:
ترکیب نانومتخلخل sba-15 دوپه شده با pd (pd-sba-15) به روش مستقیم سنتز شد. pd-sba-15 سنتزی توسط روش های طیف بینی پراش اشعه x (xrd)، میکروسکوپی الکترون روبشی (sem)، طیف بینی پراکنش انرژی (eds) و تکنیک bet مورد مطالعه قرار گرفت. ایزوترم واجذب گاز نیتروژن، اندازه تخلخل pd-sba-15 را کمتر از nm10 نشان داد. همچنین وجود pd توسط طیف بینی پراکنش انرژی تأیید گردید. به منظور مطالعه خواص الکتروکاتالیتیکیpd-...
A novel SBA-15 supported catalyst PdL(n)@SBA-15 containing a 2-pyridyl-1,2,3-triazole ligand framework was prepared via a "click" route, in which the click-triazole acted as both a stable linker and a good chelator. The catalyst was characterized and applied for the aerobic oxidation of alcohols, and the product was obtained in up to 98% yield.
BACKGROUND Removal of mercury from aqueous environment has been highly regarded in recent years and different methods have been tested for this purpose. One of the most effective ways for mercury ions (Hg(+2)) removal is the use of modified nano porous compounds. Hence, in this work a new physical modification of mesoporous silica (SBA-15) with 1, 3, 5 (Trithiane) as modifier ligand and its app...
در این کار پژوهشی، تعدادی لیگاند باز شیف شامل یک لیگاند شبه دندریمر با اتم های دهنده n2o2 [h2l1] و دو لیگاند باز شیف سه دندانه با اتم های دهنده ono [(e)-n-(1-(2- هیدروکسی فنیل اتیلن)) بنزوهیدرازید: hl2 و (e)-n-((2-هیدروکسی نفتالن-3- ایل)متیلن) بنزوهیدرازید: hl3] تهیه و شناسایی شدند و کمپلکس های آن ها با یون های مولیبدن (vi) و آهن (iii) تهیه و با طیف سنجی های uv-vis ft-ir, 1h nmr, 13c nmr, شناسا...
As a commonly used implant material, calcium sulfate cement (CSC), has some shortcomings, including low compressive strength, weak osteoinduction capability, and rapid degradation. In this study, silica-based mesoporous materials such as SBA-15 were synthesized and combined with CSC to prepare CSC/SBA-15 composites. The properties of SBA-15 were characterized by X-ray diffraction, transmission ...
Decatungstate W(10)O(32)(4-) heterogenized on a novel hydrophobically-organomodified SBA-15 was proven an efficient, green and reusable catalyst for photooxygenation by oxygen of a range of aryl alkanes to the corresponding ketones under mild conditions.
This work presents two easy ways for preparing nanostructured mesoporous composites by interconnecting and combining SBA-15 with mixed oxides derived from a calcined Mg-Al hydrotalcite. Two different Mg-Al hydrotalcite addition procedures were implemented, either after or during the SBA-15 synthesis (in situ method). The first procedure, i.e., the post-synthesis method, produces a composite mat...
SBA-15 is an interesting mesoporous silica material having highly ordered nanopores and a large surface area, which is widely employed as catalyst supports, absorbents, drug delivery materials, etc. Since it has a lack of functionality, heteroatoms and organic functional groups have been incorporated by direct or post-synthesis methods in order to modify their functionality. The aim of this art...
Tungsten oxide nanoclusters supported highly ordered mesoporous SBA-15 material has been successfully synthesized in a single step using a non-ionic surfactant as a template and used for the selective oxidation of sulfur compounds, giving excellent yields at room temperature with exceptional catalyst recyclability.
In the present work, mesoporous SBA-15 and SBA-16 were synthesised using classical methods, and their physicochemical properties were investigated by X-ray diffraction (XRD), FTIR, TEM and N2 adsorption-desorption. Rhodium (Rh, 1 wt %) was loaded on the mesoporous SBA-15 and SBA-16 by an impregnation method. The Rh surface coverage, dispersion and crystallite size were determined by room temper...
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