نتایج جستجو برای: fe mcm 22 zeolite
تعداد نتایج: 300898 فیلتر نتایج به سال:
The plasma-catalytic oxidation of soot was studied over zeolite-supported vanadium catalysts, while four types zeolites (MCM-41, mordenite, USY and 5A) were used as catalyst supports. rate followed the order V/MCM-41 > V/mordenite V/USY V/5A, 100% achieved at 54th min reaction V/mordenite. CO2 selectivity process follows opposite V/M catalyst. A wide range characterizations including N2 adso...
Zeolite has many good features that makes it very attractive for nursery use as a growing media over others. This study was designed to investigate influence of different growing media and their mixtures (with zeolite and without zeolite) on morphological characters of scots pine seedlings. Twenty-one treatments of varying amounts of peat, fine pumice, coarse pumice, river sand, perlite and riv...
The effectiveness of nanoscale zero-valent iron (nZVI) to remove heavy metals from water is reduced by its low durability, poor mechanical strength, and tendency to form aggregates. A composite of zeolite and nanoscale zero-valent iron (Z–nZVI) overcomes these problems and shows good potential to remove Pb from water. FTIR spectra support nZVI loading onto the zeolite and reduced Fe0 oxidation ...
مواد نانو حفره ساختارهای متخلخلی هستند که اندازه حفره های انها کمتر از 100 نانومتر است . این ترکیبات در منابع طبیعی و سیستم های بیولوژیکی به فراوانی یافت می شود . اندازه ونظم حفره ها ، کنترل کننده ی مواد نانو حفره ای است . نانو مواد در مقایسه با مواد در ابعاد بزرگ تر ، دارای سطوح وسیع تری هستند بعلاوه قادر به برهم کنش با گروه های شیمیایی مختلف به منظور افزایش میل ترکیبی آنها با ترکیبات ویژه می ...
Mesoporous heteroatom molecular sieve MCM-41 bulk crystals with the crystalline phase were synthesized via a one-step hydrothermal method using an ionic complex as template. The ionic complex template was formed by interaction between cetyltrimethylammonium ions and metal complex ion [M(EDTA)]2− (M = Co or Ni)]. The materials were characterized by X-ray diffraction, scanning electron microscopy...
Crystals of zeolites with intricate micropores have been widely used in industry as heterogeneous catalysts, in particular as solid acid catalysts in the fields of oil refining and petrochemistry. However, relatively small individual micropores in zeolites such as Beta, ZSM-5, and Y strongly influence mass transport to and from the active sites located within them, severely limiting the perform...
The photocatalytic degradation of methylene blue was investigated with TiO2 and Fe2O3 nanoparticles supported on natural zeolite. The synthesized photocatalyst was characterized by XRD, XRF, FT-IR, EDX, FE-SEM, and BET analyses. The results of XRD, FT-IR, and EDX confirmed the successful loading of Fe3+ doped TiO2 nanoparticles on natural zeolite. Further, the FE-SEM results confirmed the depos...
Highly ordered hexagonal mesoporous aluminosilicates (MAS-5) with uniform pore sizes have been successfully synthesized from assembly of preformed aluminosilcate precursors with cetyltrimethylammonium bromide (CTAB) surfactant. The aluminosilicate precursors were obtained by heating, at 100--140 degrees C for 2--10 h, aluminasilica gels at the Al(2)O(3)/SiO(2)/TEAOH/H(2)O molar ratios of 1.0/7....
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