Iron (III) Oxide within Mesoporous MCM-48 Silica Phases: Synthesis and Characterization

1998 ◽  
Vol 547 ◽  
Author(s):  
R. Köhna ◽  
G. Bouffaud ◽  
O. Richard ◽  
G. van Tendeloo ◽  
M. Fröba
Keyword(s):  
Pore Radius ◽  
Bet Surface Area ◽  
Synthesis And Characterization ◽  
Pore System ◽  
Wet Impregnation ◽  
X Ray ◽  
Inner Surface ◽  
Multiple Cycles ◽  
Silica Phases ◽  
X Ray Absorption

AbstractUsing multiple cycles of wet impregnation, drying and calcination procedures it was possible to form haematite nanoparticles within the pore system of mesoporous MCM-48 silica phase. A decoration/coating of the inner surface of the silica walls was indicated by a reduction of the BET surface area, the pore radius as well as HRTEM and EDX investigations. Existence of small, slightly disordered iron (III) oxide nanoparticles was proved by X-ray absorption spectroscopic measurements.

Synthesis and Characterization of Hematite Nanoparticles as Active Photocatalyst for Water Splitting Application

2013 ◽  
Vol 594-595 ◽  
pp. 73-77 ◽  
Author(s):  
Sze Mei Chin ◽  
Suriati Sufian ◽  
Jeefferie Abd Razak
Keyword(s):  
Surface Area ◽  
Water Splitting ◽  
Combustion Method ◽  
Hydrogen Gas ◽  
Bet Surface Area ◽  
Synthesis And Characterization ◽  
Hematite Nanoparticles ◽  
X Ray ◽  
Bet Specific Surface Area

This paper highlights on the hydrogen production through photocatalytic activity by using hematite nanoparticles synthesized from self-combustion method based on different stirring period. The morphologies and microstructures of the nanostructures were determined using Field-Emission Scanning Electron Microscope (FESEM), X-Ray Diffractometer (XRD) and Particle Size Analyser (PSA). Besides that, surface area analyser was used to determine the BET surface area of the hematite samples. The hematite nanocatalyst as-synthesized are proven to be rhombohedral crystalline hematite (α-Fe2O3) with particle diameters ranging from 60-140 nm. The BET specific surface area of hematite samples increased from 5.437 to 7.6425 m2/g with increasing stirring period from 1 to 4 weeks. This caused the amount of hydrogen gas produced from photocatalytic water splitting to increase as well.

scholarly journals Synthesis and Characterization of Titania-Rice Husk Silica Composites as Photocatalyst

2015 ◽  
Vol 15 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Posman Manurung ◽  
Rudy Situmeang ◽  
Ediman Ginting ◽  
Indra Pardede
Keyword(s):  
Rice Husk ◽  
Sol Gel ◽  
Bet Surface Area ◽  
Synthesis And Characterization ◽  
Ultraviolet Rays ◽  
X Ray Diffraction ◽  
Titanium Butoxide ◽  
X Ray ◽  
Scanning Electron

This article describes the synthesis of titania-silica composites by a sol-gel method using a mixture of silica of rice husk and titanium butoxide sols. Microstructures were examined at calcination temperature in the range of 500 to 700 °C, with temperatures interval of 50 °C. The sintered catalysts were subsequently tested for photodegradation of methylene blue (MB) under ultraviolet and sunlight rays. Physical characteristics were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDS), and Brunauer-Emmett-Teller (BET). The XRD results did not show the presence of silica crystal phase in each sample. The results showed that the highest BET surface area of samples was obtained at the temperature of 650 °C. In sample calcined 500 °C, the activity of the catalyst on MB was relatively similar in both sunlight and ultraviolet rays.

scholarly journals Zirconium nanoparticles prepared by the reduction of zirconium oxide using the RAPET method

2011 ◽  
Vol 2 ◽  
pp. 198-203 ◽  
Author(s):  
Michal Eshed ◽  
Swati Pol ◽  
Aharon Gedanken ◽  
Mahalingam Balasubramanian
Keyword(s):  
Stainless Steel ◽  
Absorption Spectroscopy ◽  
Elemental Analysis ◽  
Zirconium Oxide ◽  
Elevated Temperatures ◽  
Synthesis And Characterization ◽  
Xrd Pattern ◽  
X Ray ◽  
X Ray Absorption

The aim of the current work is the synthesis and characterization of metallic Zr nanoparticles. The preparation is carried out by using the RAPET method (Reaction under Autogenic Pressure at Elevated Temperatures) developed in our lab. The RAPET reaction of commercial ZrO2 with Mg powder was carried out in a closed stainless steel cell, at 750 °C. On completion of the reaction, the additionally formed MgO is removed by treatment with acid. The characterization of the product was performed by XRD, X-ray absorption spectroscopy, SEM, TEM and elemental analysis. The XRD pattern reveals that the product is composed of pure metallic zirconium, without any traces of the MgO by-product.

Synthesis and characterization of Bi2S3 composite nanoparticles with high X-ray absorption

2013 ◽  
Vol 48 (10) ◽  
pp. 3800-3804 ◽  
Author(s):  
Huan-Huan Huang ◽  
Jun Chen ◽  
Yuan-Zheng Meng ◽  
Xiao-Quan Yang ◽  
Ming-Zhen Zhang ◽  
...  
Keyword(s):  
Composite Nanoparticles ◽  
Synthesis And Characterization ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Synthesis and characterization of bimetallic metal–organic framework Cu–Ru-BTC with HKUST-1 structure

2015 ◽  
Vol 44 (5) ◽  
pp. 2052-2056 ◽  
Author(s):  
Meike A. Gotthardt ◽  
Roland Schoch ◽  
Silke Wolf ◽  
Matthias Bauer ◽  
Wolfgang Kleist
Keyword(s):  
Absorption Spectroscopy ◽  
Metal Organic Framework ◽  
Partial Substitution ◽  
Synthesis And Characterization ◽  
X Ray ◽  
Mixed Metal ◽  
Metal Framework ◽  
Metal Organic ◽  
X Ray Absorption

A mixed-metal framework Cu–Ru-BTC with the formula Cu2.75Ru0.25(BTC)2·xH2O was successfully synthesized. Partial substitution of Cu2+ by Ru3+ in the paddlewheel structure was proven using X-ray absorption spectroscopy.

scholarly journals Tin Oxide Doped on Activated Dolomites as Efficient Catalyst for Biodiesel Production

2012 ◽  
Vol 620 ◽  
pp. 378-383 ◽  
Author(s):  
Z.A. Shajaratun Nur ◽  
Y.H. Taufiq-Yap ◽  
M.Z. Hussein
Keyword(s):  
Biodiesel Production ◽  
Bet Surface Area ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Efficient Catalyst ◽  
Wet Impregnation ◽  
X Ray ◽  
Xrf Scanning ◽  
Area X ◽  
Wet Impregnation Method

Activated dolomite (AD), was investigated as a promising heterogeneous catalyst for the production of biodiesel. SnO2doped on activated dolomites catalyst (DSN) was synthesized through wet impregnation method and calcined at 500 °C for 3 h in air. The catalyst was then applied on biodiesel production via transesterification of palm cooking oil with methanol for required conditions (various time, oil to methanol ratio and amount of catalyst). X-ray Diffractometer (XRD), Brunauer-Emmet-Teller (BET) surface area, X-ray Fluoresence (XRF), Scanning Electron Microscopy (SEM) and Temperature Program Desorption (TPD) analysis were used to characterize the properties of the catalysts. Results showed that conversion of biodiesel by using DSN was higher (99.9 %) with lower optimum conditions i.e. 1:15 methanol to oil molar ratio, 1 wt. % of catalyst amount and reaction time of 6 h at 65 °C compared to AD (98.34 %) under higher conditions.

Synthesis and characterization of 1,2,3,4 tetrahydroquinoline intercalated into MoS2 in search of cleaner fuels

2007 ◽  
Vol 22 (10) ◽  
pp. 2747-2757 ◽  
Author(s):  
Karina Castillo ◽  
Felicia Manciu ◽  
J.G. Parsons ◽  
Russell R. Chianelli
Keyword(s):  
Fine Structure ◽  
Infrared Spectroscopy ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coordination Numbers ◽  
Absorption Fine ◽  
Diffraction Patterns ◽  
X Ray Absorption

Two different morphologies of MoS2 (short and long sheets) were utilized to elucidate the intercalation mechanism of 1,2,3,4 tetrahydroquinoline (THQ). MoS2 (short sheets) and molybdenite (MB) (long sheets) were exfoliated and restacked in the presence of THQ. The x-ray diffraction patterns of both samples show a new reflection in the 001 plane, which implies a lowering of symmetry and corresponds to an expansion of the layers by approximately 12.3 Å. In the MoS2-THQ sample, 80% of the MoS2 was intercalated and 20% remained stacked. In the MB-THQ sample, 30% of MB was intercalated while 70% remained stacked. X-ray absorption structure (XAS) studies showed changes in atomic geometry and coordination. The x-ray absorption near-edge spectra showed shifts in the geometry of the intercalated MoS2 and MB sample compared to the unintercalated samples. Extended x-ray absorption fine structure studies showed lower coordination numbers compared to the untreated samples. Infrared spectroscopy characterization of these same samples suggests intercalation and partial dehydrogenation of the THQ.

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