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Hydrogen storage silicas

Because of their biocompatibility, chemical stability, high thermal and electrical conductivity, sorption ability, tuneable surfaces area, pore-size distribution and straightforward functionalization chemistry, porous carbons have found application in diverse topical areas such as sensors, fuel cells, hydrogen storage, and sorption.39 11 One particular property that distinguishes porous carbon from porous silica materials is the electrical conductivity of the former that has no counterpart in siliceous-based scaffoldings. This feature opens the route for certain applications... [Pg.693]

The obtained experimental results indicate that the hydrogen uptake at 77 K and 0.1 MPa in the silica mesoporous molecular sieve, MCM-41, is very low [147], Nevertheless, MMS have been used as templates for the creation of ordered porous carbon with tailored pore sizes, which can be applied in hydrogen storage [158],... [Pg.322]

Three-dimensional supported nanomaterials basically consist of an active, nanosized species that is deposited on a three-dimensional support material exhibiting a large surface area. The final properties of such supported nanomaterials are determined by the nanoparticle species itself, the support material and the interactions between them. Depending on the support, these interactions can be physical and/or chemical in nature. In the first part of this section, the most commonly used support materials in the field of hydrogen storage, namely carbon and silica, are introduced in terms of their relevant properties. In the second part, the different synthesis strategies for the preparation of 3D supported nanomaterials are discussed. [Pg.311]

FIGURE 37.9 TEM image of silica nanoropes for hydrogen storage... [Pg.687]

Over the last 2 decades, there has been an increasing interest in the development of one-dimensional nanomaterials, such as carbon nanotubes (Ounaies et al., 2003), bacterial nanofibers (Yano et al., 2005), silica nanotubes (Miyaji et al., 2003), and titanium dioxide nanotubes and nanowires (Yuan and Su, 2004). These new materials have relatively large specific surface areas and high aspect ratios hence, they are suitable for use as reinforcements, chemical probes, sensors, hydrogen storage, displays, and templates. One-dimension material/polymer nanocomposites allow us to take advantage of the extraordinary properties of one-dimension nanomaterials. [Pg.332]

Nitric acid treatment lowered the methane uptake by about ten percent. This could be due to oxygen occupying sites within pores, but may be the result of weaker interaction between methane and an oxide surface as is observed for silica. Reduction of these treated carbons with hydrogen restored their original methane uptake. Clearly for methane storage, there is no advantage in modifying the carbon surface by nitric acid treatment. [Pg.288]

A glass drying trap on a hydrochloric acid storage tank was filled with silica gel instead of the calcium sulfate specified. The glass trap fractured, probably owing to thermal shock from the much higher heat of adsorption of water and hydrogen chloride on silica gel. [Pg.1864]

Ethanol can be derived from biomass by means of acidic/enzymatic hydrolysis or also by thermochemical conversion and subsequent enzymatic ethanol formation. Likewise for methanol, hydrogen can be produced from ethanol with the ease of storage/transportation and an additional advantage of its nontoxicity. Apart from thermodynamic studies on hydrogen from ethanol steam reforming,117-119 catalytic reaction studies were also performed on this reaction using Ni-Cu-Cr catalysts,120 Ni-Cu-K alumina-supported catalysts,121 Cu-Zn alumina-supported catalysts,122,123 Ca-Zn alumina-supported catalysts,122 and Ni-Cu silica-supported catalysts.123... [Pg.213]

Pex, P.P.A.C. and Y.C. van Delft, Silica membranes for hydrogen fuel production by membrane water gas shift reaction and development of a mathematical model for a membrane reactor, in Carbon Dioxide Capture for Storage in Deep Geologic Formations—Results from the C02 Capture Project Capture and Separation of Carbon Dioxide from Combustion Sources, eds., D. Thomas, and B. Sally, Vol. 1, Chapter 17, 2005. [Pg.322]


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See also in sourсe #XX -- [ Pg.159 ]




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