توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱A Hydrothermal low–cost synthetic route to obtain Nanoporous zirconium
نویسنده(ها): ، ،
اطلاعات انتشار: همایش بین المللی ژئولیت ایران، سال
تعداد صفحات: ۷
A new alternative low–cost route to obtain zirconium oxide mesoporous has been developed by using
cheaper inorganic Zr (ZrOCl2. 8H2O) and a surfactant template (CTAB+). Two solids, with Zr\surfactant
molar ratios (0.5 and 1) were prepared. The mesoporous materials were characterized using several
techniques, e.g, XRD, FTIR, Nitrogen adsorption, TG\DTA and SEM. Studies indicated the content of
zirconium oxide in the mesoporous materials. XRD studies indicated that the materials did not have the
standard MCM–41 structure. FTIR studies showed that zirconium ions were incorporated into the
mesoporous structure of ZrO2 mesoporous: the thermal stability of the as–synthesized materials was studied
using TGA. Nitrogen adsorption was used to determine specific surface area, pore diameter, pore volume
and wall thickness in the ZrO2 mesoporous molecular sieves.which their template was removed by
extraction. The morphology of materials after extraction and calcination was determined by means of SEM.<\div>

۲Synthesis and characterization of MCM–41 mesoporous molecular sieves ontaining Zirconium and Iron
نویسنده(ها): ، ،
اطلاعات انتشار: همایش بین المللی ژئولیت ایران، سال
تعداد صفحات: ۸
MCM–41 mesoporous molecular sieves containing Zirconium and Iron with different metal contents were
synthesized by means of hydrothermal treatment using the method of direct insertion of metal ions as
precursors in the initial stage of synthesis. The physicochemical properties of the materials were thoroughly
investigated employing X–ray powder diffraction, SEM, TGA, FTIR and N2 adsorption–desorption methods.
The results indicated that MCM–41 materials with long range hexagonal ordering could be successfully
synthesized by the hydrothermal method in the presence of Zirconium and Iron salts with the Si\(Zr+Fe)
molar ratio equal to 31 and 61.%. A further increase in the metal content deteriorated the ordering of the
materials. The morphology of Zr–Fe–MCM–41 and Zr–MCM–41 materials was determined by SEM. The
incorporated metal ions, i.e. Zr4+, Fe2+ and Fe3+ in Zr–Fe–MCM–41 are coordinated to Si(IV) by tetrahedral,
disordered octahedral and tetrahedral environments, respectively. The zirconium and iron ions are
homogenously dispersed on the internal silica surface of the Zr–Fe–MCM–41.<\div>

۳Synthesis of functionalized SBA–15 as a nano sorbent for the removal of halophenols from aqueous media
نویسنده(ها): ، ،
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۴
Present work deals with the adsorption of phenol and p–bromophenol from aqueous solutions on new nanoporous sorbent; amino–modified ordered mesoporous silica (NH2–SBA–15) material. SBA–15material was synthesized by using pluronics P123 as surfactant. Furthermore; 3–aminopropyl trimethoxy (APS) was incorporated on SBA–15 surface via post synthesis (grafting) method It was found that NH2–SBA–15 shows significant adsorption for phenol and p–bromophenol. This may be because of the acid and alkaline interaction between the amino functional group and phenol and p–bromophenol. The structural order and textural properties of the mesoporous materials were studied by XRD, SEM, FT–IR and nitrogen adsorption. The presence of functional groups was confirmed by FT–IR analyses. Batch adsorption studies were carried out to study the effect of various parameters like contact time effect of pH and initial concentration. Freundlich and Langmuir adsorption isotherms were used to model the equilibrium adsorption data for phenol and p–bromophenol.<\div>

۴DETERMINING THE SELECTIVITY OF ZEOLITE MOLECULAR SIEVES IN CO2\ CH4 ADSORPTION BY VOLUMETRIC METHOD
نویسنده(ها): ، ،
اطلاعات انتشار: اولین همایش ملی تکنولوژی های نوین در شیمی و پتروشیمی، سال
تعداد صفحات: ۶
In the present study, two kinds of zeolite molecular sieves, 13X and 4A, were collected for investigation their ability for separation of CO2 from CH4. In order to study the behaviour of these zeolites in CO2 separation from CH4, gas adsorption measurement were carried out by the use of static volumetric method in different temperatures (25, 35, 45 ºC) and pressures ranging of 1–20 bar. Both adsorbents showed good selectivity for separation of CO2 from CH4. Comparing with the 4A zeolite 13X exhibited higher adsorption capacity and selectivity for CO2\ CH4 separation.<\div>

۵RAPID SYNTHESIS OF LTA NANOZEOLITE
نویسنده(ها): ، ،
اطلاعات انتشار: سومین همایش ملی تکنولوژی های نوین در شیمی، پتروشیمی و نانو ایران، سال
تعداد صفحات: ۵
In this study, nanozeolite LTA was successfully synthesized during template–free hydrothermal method at short time and low temperature. Using inexpensive raw materials, water glass and sodium aluminate as Si and Al sources respectively, nanoparticles of NaA zeolite were achieved at just 8 hours and 100˚C. The as–synthesized LTA nanozeolite was characterized using X–Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X–ray (EDX) analysis and Fourier Transform Infrared (FT–IR) Spectroscopy. In addition, the effect of temperature on the phase purity and morphology of LTA nanoparticles was also investigated.<\div>

۶SILICON NANOWIRES DECORATED BY COPPER NANOPARTICLES AS CATALYST
نویسنده(ها): ،
اطلاعات انتشار: سومین همایش ملی تکنولوژی های نوین در شیمی، پتروشیمی و نانو ایران، سال
تعداد صفحات: ۵
Silicon nanowires have prepared from powder source by metal assisted chemical etching method. The metal nanoparticles that used were silver nanoparticles. Then this substrate was dissolved in copper nitrate solution to decorate copper nanoparticles on the surface of nanowires. Non noble metal, copper nanoparticles with controlled size and surface by a simple galvanic displacement reaction has been decorated. This prepared catalyst analysed by X–ray diffraction and SEM image. This compound employed as a catalyst for reduction of 4–Nitrophenol to 4–Aminophenol<\div>

۷THE EFFECT OF DEALUMINATION–DESILICATION TREATMENT ON THE POROSITY CHARACTERISTICS OF COMMERCIAL GRANULAR ZEOLITE 13X
نویسنده(ها): ،
اطلاعات انتشار: سومین همایش ملی تکنولوژی های نوین در شیمی، پتروشیمی و نانو ایران، سال
تعداد صفحات: ۷
In this study, commercial granular zeolite 13X underwent dealumination using chelating agent EDTA and subsequent desilication by the aid of sodium hydroxide solution. Both parent zeolite (PZ) and treated samples (DZ) were characterized by scanning electron microscopy–energy dispersive x–ray (SEM\EDX), nitrogen adsorption–desorption isotherm, Fourier transform infrared (FT–IR) and xray diffraction (XRD) analysis techniques. The results indicated that due to low Si to Al ratio of zeolite 13X and the presence of binder used to make granular product from the initial powder zeolite, the consecutive dealumination–desilication post–treatment led to partial damage of micropores without creating new porous systems in the zeolite framework. However, the crystallinity of treated samples from XRD patterns was so better compared to that of parent zeolite. The study suggests that in order to introduce mesoporosity in commercial shaped zeolites, two important parameters i.e. silica to alumina ratio and the presence of the binders would influence the processes<\div>

۸CHARACTERIZATION OF ZEOLITE\CARBON NANOTUBE COMPOSITE PREPARED BY HYDROTHERMAL METHOD
نویسنده(ها): ، ،
اطلاعات انتشار: سومین همایش ملی تکنولوژی های نوین در شیمی، پتروشیمی و نانو ایران، سال
تعداد صفحات: ۶
A hybrid composite of NaY zeolite and amine modified multi walled carbon nanotube (MWCNT) has been synthesized by hydrothermal method. The obtained NaY\CNT composite (NC composite) was characterized by X–ray diffraction (XRD), Fourier transform infrared (FT–IR), Scanning electron microscopy (SEM) and BET analysis. Crystal structures of NC composite were similar to those of pure NaY zeolite, but the surface area and pore volume of the NC composite are enhanced. Incorporation of MWCNTs into NaY zeolite increases nucleation sites for the formation of NaY zeolite crystals, resulting in the smaller size of NaY zeolite crystals. Gas adsorption capacity and selectivity of NC composite increased because of enhancement of micropore volume. The results confirm that NC composite is a promising material for the separation and purification of gases.<\div>
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