reactors based on hydrogen selective membranes can achieve significantly higher
power generation efficiencies for water gas shift reaction. Among the available
hydrogen selective membranes, palladium metal-based membranes have superior
selectivity; however, they are easily prone to poisoning in carbonaceous fuels.
Alternatively, ceramic membranes, particularly, silicon carbide (SiC) membranes
showed excellent potential due to their high mechanical strength, good thermal
and chemical resistance, superior hydrothermal stability and good selectivity
for hydrogen with reasonable flux.
project, we are aiming to develop multilayer silicon carbide flat architectures
with graded porosity. The architecture will consist of macro-porous support
layer, on which an intermediate meso-porous layer, and finally the micro-porous
layer will be deposited. The support layer will be fabricated using extrusion
process using SiC powders and the intermediate layer will be fabricated using
dip-coating/sol-gel methods using nano-SiC powders and/or precursors. The final
functional layer will be deposited using SiC polymer precursors. The process
parameters for multi-step sintering and co-sintering of the fabricated layers
will be investigated. Physical and chemical characterization of the individual
layers and multilayered structured will be carried out.
execution of the project will take place at our state-of-the-art laboratories
and the student will acquire the following skills.
based ceramic processing
temperature sintering processes
characterization – Mercury porosimetry, surface area analysis, particle size
characterization - X-ray diffraction analysis, Scanning electron microscopy
selectivity and flux measurements.
General understanding of physics, chemistry and
materials science is required; lab working experience is preferred but not
essential. Ability to follow the instructions along with independent thinking
and quick learning skills are a plus.
eneral understanding of physics, chemistry and materials science is required; lab working experience is preferred but not essential.