scholarly journals Nanostructured TiO2 Doped with Nb as a Novel Support for PEMFC

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Edgar Valenzuela ◽  
Victor Ramos-Sanchez ◽  
Alejandro Adolfo Lambert Arista ◽  
Oumarou Savadogo
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Electronic Conductivity ◽  
Catalyst Support ◽  
High Surface Area ◽  
Particle Dispersion ◽  
Metallic Oxide ◽  
Oxide Support ◽  
The Stability

Nowadays, one of the major issues of the PEMFC concerns the durability. Historically, carbon has been used as a catalyst support in PEMFC; nevertheless, under the environmental conditions of the cell, the carbon is oxidized, leaving the catalyst unsupported. In order to increase the stability and durability of the catalyst in the PEMFC, a novel nanostructured metallic oxide support is proposed. In this work, TiO2 was doped with Nb to obtain a material that combines chemical stability, high surface area, and an adequate electronic conductivity in order to be a successful catalyst support candidate for long-term PEMFC applications. The TiO2-Nb nanostructured catalyst support was physically and electrochemically characterized. According to the results, the TiO2-Nb offers high surface area and good particle dispersion; also, the electrochemical activity and stability of the support were evaluated under high potential conditions, where the TiO2-Nb proved to be much more stable than carbon.

Three Waves of Disinfectants to Inactivate Bacteria

2013 ◽  
Vol 1498 ◽  
pp. 91-96 ◽  
Author(s):  
Sajid Bashir ◽  
James Dinn ◽  
Jingbo Liu
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Metallic Silver ◽  
Third Wave ◽  
Engineered Surfaces ◽  
Metal Organic ◽  
Metal Doped ◽  
Second Wave

ABSTRACTMetallic silver nanoparticles (NPs) have extensively been used in the treatment of disease and purification and heralded the ‘first wave’ of disinfection science, the ‘second wave’ being the nanocomposite of metal-doped TiO2. Recent advances in engineered surfaces have enabled ultrahigh surface area and rapid sterilization via using metal-organic frameworks (MOFs) as the ‘third wave’ disinfectant. MOFs offer the same advantages as colloids but also have ultra high surface area, long term persistence and ultra low doses, applied for water purification.

“Hairy Foam”: carbon nanofibers grown on solid carbon foam. A fully accessible, high surface area, graphitic catalyst support

2008 ◽  
Vol 18 (21) ◽  
pp. 2426 ◽  
Author(s):  
Patrick W. A. M. Wenmakers ◽  
John van der Schaaf ◽  
Ben F. M. Kuster ◽  
Jaap C. Schouten
Keyword(s):  
Surface Area ◽  
Carbon Nanofibers ◽  
High Surface ◽  
Catalyst Support ◽  
High Surface Area ◽  
Carbon Foam ◽  
Solid Carbon

High surface area silicon carbide doped with zirconium for use as catalyst support. Preparation, characterization and catalytic application

1999 ◽  
Vol 180 (1-2) ◽  
pp. 385-397 ◽  
Author(s):  
Cuong Pham-Huu ◽  
Christophe Bouchy ◽  
Thierry Dintzer ◽  
Gabrielle Ehret ◽  
Claude Estournes ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Surface Area ◽  
High Surface ◽  
Catalyst Support ◽  
High Surface Area ◽  
Catalytic Application

Preparation and Properties of Zno/Vermiculite Composite Particles

2012 ◽  
Vol 455-456 ◽  
pp. 265-270 ◽  
Author(s):  
Ling Jin ◽  
Bin Dai
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
Catalyst Support ◽  
High Surface Area ◽  
Xrd Analysis ◽  
Area Measurement ◽  
Photocatalytic Decomposition ◽  
Bet Surface Area ◽  
Effect Of Support

ZnO/vermiculite as the novel photocatalysts were prepared by two approachs: one is mixtures of ZnO and different acid treated vermiculite, and another is sol-gel method. The acid activated vermiculite as a new promising catalyst support and adsorbent has a large capacity of absorption, high surface area and thermal stability. The activity of catalyst has been interrelated to support and ZnO. Based on the important effect of support on ZnO/vermiculite photocatalysts, treatment of vermiculite by nitric acid of different concentration was studied by evaluated in the photocatalytic decomposition of MB with resulting photocatalysts. BET surface area measurement and X-ray diffraction (XRD) analysis were used to characteristic of ZnO particle in acid treated vermiculite structure and the phase structure and crystallization index of ZnO in the modified vermiculite mineral. Results showed the ZnO-vermiculite combination possessing higher photocatalytic activity due to the synergistic effect when compared to the commercial ZnO.

Magnesium oxide as a heterogeneous catalyst support

2016 ◽  
Vol 36 (1) ◽  
pp. 1-41 ◽  
Author(s):  
Nurhidayatullaili Muhd Julkapli ◽  
Samira Bagheri
Keyword(s):  
Surface Area ◽  
Heterogeneous Catalyst ◽  
High Surface ◽  
Catalyst Support ◽  
High Surface Area ◽  
Nanocrystalline Structure ◽  
Catalytic Performance ◽  
Acid Base ◽  
Factors Affecting ◽  
Crystal And Electronic Structure

AbstractResearchers normally consider MgO as a promising high-surface-area heterogeneous catalyst support, additive, and promoter for many kinds of chemical reactions due to its certain properties, including stoichiometry and composition, cation valence, redox properties, acid-base character, and crystal and electronic structure. The presence of MgO as a support catalyst also modifies the electronic state of the overall catalytic performance by electron transfer between the native catalyst and MgO as support. The influence is clarified by alteration of acid-base properties of the catalyst-supported MgO. Meanwhile, the method, chemical composition, and condition in the preparation of MgO are the important factors affecting its surface and catalytic properties. Therefore, MgO with a high surface area and nanocrystalline structure has encouraging applications for some reactions, including as dry reforming, dehydrohalogenation, oxidative dehydrogenation of butane, nonoxidative dehydrogenation of ethylbenzene, decomposition of CCl

Thermal Stabilization of γ-Al2O3 with Modification of Polyethylene Glycol by Reverse Precipitation Method

2012 ◽  
Vol 560-561 ◽  
pp. 169-173
Author(s):  
Yu Sheng Wu ◽  
Jiao Ma ◽  
Fang Hu
Keyword(s):  
Polyethylene Glycol ◽  
Surface Area ◽  
High Surface ◽  
Catalyst Support ◽  
High Surface Area ◽  
Thermal Stabilization ◽  
Treatment Temperature ◽  
Precipitation Method ◽  
Different Content ◽  
Reverse Precipitation

A series of γ-Al2O3 modified with different content of polyethylene glycol (PEG) was prepared by a reverse precipitation method. The phase transformation, thermal stabilization and the morphology of PEG-modified γ-Al2O3 was studied by XRD, BET and TEM, respectively. The results showed that the γ-Al2O3 with 1mol% PEG-modified has the excellent thermal stabilization after calcined at 1100°C for 3h. With the content of PEG increasing, the surface area of γ-Al2O3 was reduced gradually. Simultaneity, the γ-Al2O3 phase was transferred to θ-Al2O3 with the surface area 92 m2g-1 and a pore volume of 0.77 cm3g-1. The high surface area maintained at such high treatment temperature shows the 1mol% PEG-modified γ-Al2O3 prepared by reverse precipitation method can be applied in the automotive three-way catalyst support.

Template preparation of high-surface-area barium hexaaluminate as nickel catalyst support for improved CO methanation

RSC Advances ◽  
2013 ◽  
Vol 3 (39) ◽  
pp. 18156 ◽  
Author(s):  
Jiajian Gao ◽  
Chunmiao Jia ◽  
Meiju Zhang ◽  
Fangna Gu ◽  
Guangwen Xu ◽  
...  
Keyword(s):  
Surface Area ◽  
Nickel Catalyst ◽  
High Surface ◽  
Catalyst Support ◽  
High Surface Area ◽  
Co Methanation ◽  
Barium Hexaaluminate

Stability of Aqueous Suspensions of High Surface area Zirconia Powders in the Presence of Polyacrylic Acid Polyelectrolyte

1992 ◽  
Vol 271 ◽  
Author(s):  
Michel M. R. Boutz ◽  
R. J. M. Olde Scholtenhuis ◽  
A. J. A. Winnubst ◽  
A. A. J. Burggraaf
Keyword(s):  
Surface Area ◽  
Polyacrylic Acid ◽  
Ph Value ◽  
High Surface ◽  
High Surface Area ◽  
Tetragonal Zirconia ◽  
Aqueous Suspensions ◽  
Optimum Ph ◽  
The Stability ◽  
Zirconia Powders

ABSTRACTIn this paper results of efforts to prepare stable aqueous suspensions of high surface area (> 100 m2 /gr) yttria stabilized tetragonal zirconia powders are presented using a low molecular weight ammonium polyacrylic acid deflocculant. Zetapotentials, viscosities, agglomerate sizes and sedimentation volumes have been measured to find the optimum pH and deflocculant concentration. It has been found that the optimum pH-value coincides with the pH at which the polyacrylic acid is fully dissociated. Using deflocculant concentrations below the optimum value leads to a highly unstable system, while concentrations above the optimum value influence the stability in a much weaker way.

Sign in / Sign up

Export Citation Format

Share Document