Abstract
In this work, palladium (Pd) nanoparticles were blended into a solution of a sacrificial polymer and an aluminum sol gel precursor to form alumina fibers containing the palladium particles. The polymer solution was electrospun into template submicron fibers. These fibers were calcined at temperatures between 650 °C and 1150 °C to remove the polymer and oxidize the aluminum. The internal crystalline morphologies of the calcined fibers transformed with change in the calcination temperature. The calcined fibers were formed into fibrous mats and further tested for their catalytic performances. The Pd particles had a size ranging from 5–20 nm and appeared randomly distributed within and near the surfaces of the alumina fibers. The final metal loading of all Pd/Al2O3 samples ranged from 4.7 wt % to 5.1 wt %. As calcination temperature increased the alumina crystal structure changed from amorphous at 650 °C to alpha crystal structure at 1150 °C. With the increase of calcination temperature, the average fiber diameters and specific surface areas decreased. The catalyst supported fiber media had good conversion of NO and CO gases. Higher calcination temperatures led to higher reaction temperatures from 250 to about 450 °C for total conversion, indicating the effective reactivity of the fiber-supported catalysts decreased with increase in calcination temperature. The fibers formed at the 650 °C calcination temperature had the highest reaction activity.
Highlights
The catalyzed reaction decomposition of NO with CO gases are of significant interests for environmental and health reasons
Palladium doped alumina submicron fibers were produced by the electrospinning and calcination of the polymer template fibers
The Pd-Au fiber samples were further characterized by scanning electron microscope (SEM), Palladium TEM, doped alumina submicron fibers were produced by the electrospinning and calcination
Summary
The catalyzed reaction decomposition of NO with CO gases are of significant interests for environmental and health reasons. Reaction performance can be enhanced by applying the catalyst as small nano- or micro-scale particles that have increased surface areas of the catalysts per unit mass of metal [20]. These small particles are often supported on an inert substrate for ease of handling and to immobilize the particles, preventing them from moving with the gas or liquid flow streams. The small diameters of nanofibers may affect the crystal phases in alumina fibers, and the method of introduction of the catalyst particles into the sol gel precursor solution may introduce enough differences in the structure that experiments are needed to determine whether the crystal phases of the alumina in nanofiber form affects the catalyst performance. Experiments were conducted to observe the catalyst performance to react gaseous CO and NO
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