High Surface-Area Silica with Controlled Pore Size Prepared from Nanocomposite of Silica and Citric Acid

2000 ◽  
Vol 104 (51) ◽  
pp. 12184-12191 ◽  
Author(s):  
Ryoji Takahashi ◽  
Satoshi Sato ◽  
Toshiaki Sodesawa ◽  
Machiko Kawakita ◽  
Katsuyuki Ogura
Keyword(s):  
Citric Acid ◽  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area

Pore Size Control of High Surface-Area Silica by Use of Citric Acid

1999 ◽  
Vol 28 (10) ◽  
pp. 1107-1108 ◽  
Author(s):  
Ryoji Takahashi ◽  
Satoshi Sato ◽  
Toshiaki Sodesawa ◽  
Machiko Kawakita
Keyword(s):  
Citric Acid ◽  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Size Control ◽  
Pore Size Control

EVALUATION OF THE EFFECT OF CATALYST TEXTURAL PROPERTIES ON EFFECTIVE SYNTHESIS OF CARBON NANOTUBES

2013 ◽  
Vol 12 (04) ◽  
pp. 1350030
Author(s):  
WEI-MING YEOH ◽  
KIM-YANG LEE ◽  
KEAT-TEONG LEE ◽  
ABDUL RAHMAN MOHAMED ◽  
SIANG-PIAO CHAI
Keyword(s):  
Carbon Nanotubes ◽  
Citric Acid ◽  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Textural Properties ◽  
High Yield ◽  
Polyethylene Glycol 200 ◽  
Synthesis Of Carbon Nanotubes

Co – Mo / MgO catalysts of same content but different textural properties were prepared through manipulation of foaming agents (ethylene glycol, citric acid and polyethylene glycol 200) in a sol–gel method. Experimental results indicated that surface area and pore size of the catalysts were equally important in the synthesis of carbon nanotubes (CNTs) from catalytic chemical vapor deposition. It was found that the catalysts with high surface area and large pore size were the main criteria for high yield synthesis of CNTs of better graphitized wall structure. High surface area helped in the dispersion of active metals, thus increasing the number of active sites for nucleation and growth of CNTs. Meanwhile, larger pore size facilitated better mass transfer between the inner pore and the exterior reaction atmosphere, and it provided a larger space for unrestricted growth of CNTs. In the present work, we demonstrated that the Co – Mo / MgO catalysts prepared by citric acid possessed both larger average pore size and higher surface area, which provoked the synthesis of better quality (graphitized) CNTs in high yield.

High Surface Area, Mesoporous, Glassy Alumina with a Controllable Pore Size by Nanocasting from Carbon Aerogels

2005 ◽  
Vol 11 (5) ◽  
pp. 1658-1664 ◽  
Author(s):  
Wen-Cui Li ◽  
An-Hui Lu ◽  
Wolfgang Schmidt ◽  
Ferdi Schüth
Keyword(s):  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Aerogels

scholarly journals Synthesis and characterization of porous silica and polyaniline-porous silica composite materials with high surface area

2014 ◽  
Vol 49 (1) ◽  
pp. 1-8
Author(s):  
US Akhtar ◽  
MK Hossain ◽  
MS Miran ◽  
MYA Mollah
Keyword(s):  
Electron Microscopy ◽  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Porous Silica ◽  
Nitrogen Adsorption ◽  
High Specific Surface Area ◽  
Molar Ratio ◽  
Cylindrical Pore

Porous silica materials were synthesized from tetraethyl orthosilicate (TEOS) using Pluronic P123 (non-ionic triblock copolymer, EO20PO70O20) as template under acidic conditions which was then used to prepare polyaniline (PAni) and porous silica composites (PAnisilica) at a fixed molar ratio. These materials were characterized by nitrogen adsorption-desorption isotherm measured by Barrett-Joyner- Halenda (BJH) method and pore size distribution from desorption branch and surface area measured by the Brunauer-Emmett-Teller (BET) method, scanning electron microscopy (SEM), transmission electron microscopy (TEM), TEM-energy dispersive X-ray (EDX) and Fourier transform infrared (FT-IR) spectroscopy. The composite maintains its structure even after the polymerization and the polymer is dispersed on the inorganic matrix. The rod-like porous silica was about 1?m to 1.5 ?m long and on an average the diameter was in the range of 300- 500 nm. The SEM and TEM images show well ordered 2d hexagonal pore, high specific surface area (850 m2g-1) and uniform pore size of ca. 6.5 nm in diameter. After incorporation of PAni inside the silica pore, framework of porous silica did not collapse and the surface area of the composite was as high as 434 m2g-1 which was 5.5 time higher than our previous report of 78.3 m2g-1. Due to shrinkage of the framework during the incorporation of aniline inside the silica, the pore diameter slightly increase to 7.5 nm but still showing Type IV isotherm and typical hysteresis loop H1 implying a uniform cylindrical pore geometry. DOI: http://dx.doi.org/10.3329/bjsir.v49i1.18847 Bangladesh J. Sci. Ind. Res. 49(1), 1-8, 2014

Sign in / Sign up

Export Citation Format

Share Document