Pillaring of a Layered Titanate With Alumina: Effect of Hydrolysis Solution

1998 ◽  
Vol 549 ◽  
Author(s):  
F. Kooli ◽  
T. Sasaki ◽  
V. Rives ◽  
M. Watanabe
Keyword(s):  
Surface Area ◽  
Pore Diameter ◽  
High Surface ◽  
High Surface Area ◽  
Average Diameter ◽  
Average Pore ◽  
Keggin Ions ◽  
Layered Titanate ◽  
Pillaring Solution ◽  
Thermal Stability Of

AbstractA layered titanate with a lepidocrocite-type structure has been pillared with Al13 Keggin ions to prepare a porous and high-surface-area material. Pillaring was achieved by ion exchange of hexylammonium (HA-Ti) or tetrabuthylammonium (TBA-Ti) intercalated titanates with Keggin Al13 complex. The thermal stability of the Al13 intercalates depended on the amount of aluminum incorporated. The surface area and porosity can be tailored by controlling the amount of aluminum uptake and by the nature of base used to prepare the aluminium pillaring solution. In addition, the material derived from HA-Ti exhibited a sharp pore size distribution with an average diameter of 2 nm, while the pillared product obtained from TBA-Ti showed mostly a broad mesoporous distribution with an average pore diameter of 4 nm.

Use of High Surface Area TiO2 Nanosheet in Dye-sensitized Solar Cell

2006 ◽  
Vol 951 ◽  
Author(s):  
Sorapong Pavasupree ◽  
Supachai Ngamsinlapasathian ◽  
Yoshikazu Suzuki ◽  
Susumu Yoshikawa
Keyword(s):  
Surface Area ◽  
Pore Diameter ◽  
High Surface ◽  
High Surface Area ◽  
Mesoporous Structure ◽  
Energy Conversion Efficiency ◽  
Bet Surface Area ◽  
Average Pore ◽  
Dye Sensitized ◽  
Solar Energy Conversion Efficiency

ABSTRACTHigh surface area nanosheet TiO2 with mesoporous structure were synthesized by hydrothermal method at 130 °C for 12 h. The samples characterized by XRD, SEM, TEM, SAED, and BET surface area. The nanosheet structure was slightly curved and approximately 50-100 nm in width and several nanometers in thickness. The as-synthesized nanosheet TiO2 had average pore diameter about 3-4 nm. The BET surface area and pore volume of the sample were about 642 m2/g and 0.774 cm3/g, respectively. The solar energy conversion efficiency (η) of the cell using nanorods/nanoparticles TiO2 (from the nanosheet calcined at 450 °C for 2 h) with mesoporous structure was about 7.08 % with Jsc of 16.35 mA/cm2, Voc of 0.703 V and ff of 0.627; while η of the cell using P-25 reached 5.82 % with Jsc of 12.74 mA/cm2, Voc of 0.704V and ff of 0.649.

Fabrication of Ag/ZnO Nanoparticles Using Ascorbic Acid as Reducing Agent

2016 ◽  
Vol 1133 ◽  
pp. 462-466 ◽  
Author(s):  
Jeyashelly Andas ◽  
Nor Wahida Subri
Keyword(s):  
Ascorbic Acid ◽  
Surface Area ◽  
Zno Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
Absorption Spectrometry ◽  
Average Diameter ◽  
Reducing Agent ◽  
Bet Surface Area ◽  
Simple Method

High surface area Ag/ZnO with an average diameter of 13.95 nm was successfully synthesized through a facile route, using ascorbic acid and silica rice husk as reducing agent and amorphous support respectively. This nanomaterial was characterized by transmission electron microscopy, N2 adsorption-desorption, atomic absorption spectrometry and particle size analyzer. This simple method resulted in the production of almost spherical Ag/ZnO nanoparticles with high BET surface area and large pore volume of 341.46 m2g-1 and 0.59 cm3g-1 respectively. This preliminary study revealed the successful inclusion of metal cations into the silica framework without damaging the mesoporosity nature of silica.

Surfactant-Templated Synthesis of Modified Porous Clay Heterostructure (PCH)

2008 ◽  
Vol 55-57 ◽  
pp. 317-320 ◽  
Author(s):  
K. Srithammaraj ◽  
Rathanawan Magaraphan ◽  
H. Manuspiya
Keyword(s):  
Pore Volume ◽  
Pore Diameter ◽  
Condensation Reaction ◽  
High Surface ◽  
High Surface Area ◽  
Bentonite Clay ◽  
Directed Assembly ◽  
Average Pore Diameter ◽  
Average Pore ◽  
Surface Areas

Porous Clay Heterostructures (PCHs) have been prepared by the surfactant-directed assembly of mesostructured silica within the two-dimensional interlayer galleries of clays. The PCH is an interesting material to use as entrapping system such as ethylene scavenger, owing to its high surface area with uniform and specific pore size. In the present work, the PCH was synthesized within the galleries of Na-bentonite clay by the polymerization of tetraethoxysilane (TEOS) in the presence of surfactant micelles. In addition, a mesoporous clay with organic-inorganic hybrid (HPCH) is modified via co-condensation reaction of TEOS with methyltriethoxysilane (MTS) to enhance hydrophobicity of PCH material for entrapping system. According to pore characterization, PCHs have surface areas of 421-551 m2/g, an average pore diameter in the supermicropore to small mesopore range of 4.79-5.02 nm, and a pore volume of 0.57-0.66 cc/g while HPCHs have surface areas of 533-966 m2/g, an average pore diameter of 4.28-6.38 nm, and a pore volume of 0.42-0.77cc/g.

Preparation of High Surface Area Anatase TiO2 by a Low Temperature Hydrothermal Process

2011 ◽  
Vol 299-300 ◽  
pp. 106-109
Author(s):  
Mei Zhen Gao ◽  
Zhi Rong Zhang ◽  
Wen Li ◽  
Wen Bao Liu ◽  
Bing Jun Yang
Keyword(s):  
Electron Microscope ◽  
Low Temperature ◽  
Surface Area ◽  
Pore Diameter ◽  
High Surface ◽  
Hydrothermal Process ◽  
Mesoporous Structure ◽  
Average Pore Diameter ◽  
Average Pore ◽  
Adsorption Desorption

Pure anatase TiO2spheres with mesoporous structure were prepared by a simple urea assisted hydrothermal process at low temperature. The characterization of TiO2was examined by X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), N2adsorption-desorption and ultraviolet visible spectrophotometer (UV-VIS). The TEM and N2adsorption-desorption results confirmed that TiO2spheres has a mesoporous structure. The surface area of TiO2annealed at 400 °C is up to 302.3 m2/g with average pore diameter about 4.1 nm. While after annealed at 500 °C, the average pore diameter of TiO2is about 6.8 nm, but the surface area reduces to 142.6 m2/g

scholarly journals Synthesis and Characterization of Copper Impregnated Mesoporous Carbon as Heterogeneous Catalyst for Phenylacetylene Carboxylation with Carbon Dioxide

2020 ◽  
Vol 21 (1) ◽  
pp. 77
Author(s):  
Putri Nurul Amalia ◽  
Iman Abdullah ◽  
Dyah Utami Cahyaning Rahayu ◽  
Yuni Krisyuningsih Krisnandi
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Mesoporous Carbon ◽  
High Surface ◽  
High Surface Area ◽  
Bet Surface Area ◽  
Soft Template ◽  
Average Pore ◽  
Carbon Dioxide Co2

Carbon dioxide (CO2) is a compound that can potentially be used as a carbon source in the synthesis of fine chemicals. However, the utilization of CO2 is still constrained due to its inert and stable nature. Therefore, the presence of a catalyst is needed in CO2 conversion. This study aims to synthesize copper impregnated mesoporous carbon (Cu/MC) as a catalyst for phenylacetylene carboxylation reaction with CO2 to produce phenylpropiolic acid. The synthesis of mesoporous carbon was performed via the soft template method. The as-synthesized Cu/MC material was characterized by FTIR, SAA, XRD, and SEM-EDX. BET surface area analysis of mesoporous carbon showed that the material has a high surface area of 405.8 m2/g with an average pore diameter of 7.2 nm. XRD pattern of Cu/MC indicates that Cu has been successfully impregnated in the form of Cu(0) and Cu(I). Phenylacetylene carboxylation reaction with CO2 was carried out by varying reaction temperatures (25, 50, and 75 °C), amount of catalyst (28.6, 57.2, and 85.8 mg), type of base (Cs2CO3, K2CO3, and Na2CO3), and variation of support. The reaction mixtures were analyzed by HPLC and showed that the highest phenylacetylene conversion of 41% was obtained for the reaction at 75 °C using Cs2CO3 as a base.

Thermal stability of a high surface area ceria under reducing atmosphere

1995 ◽  
Vol 129 (1) ◽  
pp. 69-82 ◽  
Author(s):  
V. Perrichon ◽  
A. Laachir ◽  
S. Abouarnadasse ◽  
O. Touret ◽  
G. Blanchard
Keyword(s):  
Thermal Stability ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Reducing Atmosphere ◽  
Thermal Stability Of
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