SBA-15 Molecular Sieve Using Clay as Silicon Sources

New sources of silica as a replacement for TEOS in the synthesis of SBA-15 are been performed by various research teams worldwide. The aim of this work is to describe the synthesis and characterization of SBA-15 made with chocolate B clay as an alternative source of silica by the hydrothermal method. Samples of classic SBA-15 were made with the traditional TEOS method. The samples of the two silica sources were characterized by DRX, EDX, and BET to evaluate the effects of the silica source on the synthesis of the molecular sieve. The chocolate B clay was efficient in the formation of the molecular sieve structure, but there was a great reduction in the surface area and total pore volume in comparison to the surface area of classic SBA-15.

Download Full-text

Synthesis and characterization of high-surface area tungsten carbides and application to electrocatalytic hydrogen oxidation

Applied Catalysis A General ◽

10.1016/j.apcata.2007.02.011 ◽

2007 ◽

Vol 323 ◽

pp. 86-93 ◽

Cited By ~ 66

Author(s):

Yoshinori Hara ◽

Noriko Minami ◽

Hiroaki Itagaki

Keyword(s):

Surface Area ◽

Hydrogen Oxidation ◽

High Surface ◽

High Surface Area ◽

Synthesis And Characterization ◽

Tungsten Carbides

Download Full-text

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.594-595.73 ◽

2013 ◽

Vol 594-595 ◽

pp. 73-77 ◽

Cited By ~ 1

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.

Download Full-text

Synthesis and Characterization of Nanoporous Monetite Which Can Be Applicable for Drug Carrier

Journal of Nanomaterials ◽

10.1155/2012/931492 ◽

2012 ◽

Vol 2012 ◽

pp. 1-5 ◽

Cited By ~ 11

Author(s):

Esmael Salimi ◽

Jafar Javadpour

Keyword(s):

Surface Area ◽

Cetyltrimethylammonium Bromide ◽

Drug Carrier ◽

Synthesis And Characterization ◽

X Ray ◽

Plate Shape ◽

Desorption Isotherms ◽

Adsorption Desorption

Wormhole-like mesostructured monetite was successfully synthesized using cetyltrimethylammonium bromide (C19H42BrN, CTAB), as a porosity agent. X-ray techniques and FTIR reveal that the crystalline grains consist of highly crystalline pure monetite phase. Monetite rods with diameter around 20–40 nm and length in the range of 50–200 nm were confirmed by FESEM and TEM. Based on N2adsorption-desorption isotherms investigation, surface area increased up to 31.5 m2/g due to the removal of surfactant after calcinations at 400°C. The results indicate that CTAB can not only affect monetite crystallization but also change particles morphology from plate shape to rod-like.

Download Full-text