2 research outputs found
Nanoarchitectures Based on Layered Titanosilicates Supported on Glass Fibers: Application to Hydrogen Storage
Nanoarchitectures Based on Layered Titanosilicates Supported on Glass Fibers: Application to Hydrogen Storage
This work reports on the synthesis of nanosheets of layered
titanosilicate
JDF-L1 supported on commercial E-type glass fibers with the aim of
developing novel nanoarchitectures useful as robust and easy to handle
hydrogen adsorbents. The preparation of those materials is carried
out by hydrothermal reaction from the corresponding gel precursor
in the presence of the glass support. Because of the basic character
of the synthesis media, silica from the silicate-based glass fibers
can be involved in the reaction, cementing its associated titanosilicate
and giving rise to strong linkages on the support with the result
of very stable heterostructures. The nanoarchitectures built up by
this approach promote the growth and disposition of the titanosilicate
nanosheets as a house-of-cards radially distributed around the fiber
axis. Such an open arrangement represents suitable geometry for potential
uses in adsorption and catalytic applications where the active surface
has to be available. The content of the titanosilicate crystalline
phase in the system represents about 12 wt %, and this percentage
of the adsorbent fraction can achieve, at 298 K and 20 MPa, 0.14 wt
% hydrogen adsorption with respect to the total mass of the system.
Following postsynthesis treatments, small amounts of Pd (<0.1 wt
%) have been incorporated into the resulting nanoarchitectures in
order to improve their hydrogen adsorption capacity. In this way,
Pd-layered titanosilicate supported on glass fibers has been tested
as a hydrogen adsorbent at diverse pressures and temperatures, giving
rise to values around 0.46 wt % at 298 K and 20 MPa. A mechanism of
hydrogen spillover involving the titanosilicate framework and the
Pd nanoparticules has been proposed to explain the high increase in
the hydrogen uptake capacity after the incorporation of Pd into the
nanoarchitecture