2 research outputs found
Selective Hydrogenation of Acetylene over Pd-In/Al<sub>2</sub>O<sub>3</sub> Catalyst: Promotional Effect of Indium and Composition-Dependent Performance
Highly
dispersed bimetallic Pd-In catalysts on Al<sub>2</sub>O<sub>3</sub> were prepared by a simple impregnation method. In comparison
with the unsupported intermetallic catalyst, the supported Pd-In catalyst
exhibited several magnitudes higher activity and similar selectivity
for selective acetylene hydrogenation. Moreover, the activity, selectivity,
and anticoking performance of the Pd-In catalyst were superior to
those of the monometallic Pd catalyst. The electron transferred from
indium weakened the adsorption of ethylene on the negatively charged
Pd sites and hence improved the selectivity of Pd-In/Al<sub>2</sub>O<sub>3</sub>. The inhibited formation of hydride due to the presence
of indium also contributed to the higher selectivity. The promoted
activation of hydrogen, owing to the weak adsorption of acetylene
on Pd-In/Al<sub>2</sub>O<sub>3</sub>, and decreased particle size
jointly contributed to the enhanced activity of Pd-In/Al<sub>2</sub>O<sub>3</sub>. In addition, green oil formation on Pd-In/Al<sub>2</sub>O<sub>3</sub> was retarded by the presence of indium, contributing
to the enhanced stability of the catalyst. The bimetallic Pd-In catalysts
showed a strongly composition dependent performance, which resulted
from the different extent of electronic and/or geometric modification
of Pd active sites
Synthesis of Robust Sandwich-Like SiO<sub>2</sub>@CdTe@SiO<sub>2</sub> Fluorescent Nanoparticles for Cellular Imaging
Synthesis of Robust Sandwich-Like
SiO<sub>2</sub>@CdTe@SiO<sub>2</sub> Fluorescent Nanoparticles for
Cellular Imagin