1 research outputs found
Effects of Doping Rare Earth Elements (Y, La, and Ce) on Catalytic Performances of CoMo/MgAlM for Water Gas Shift Reaction
Rare earth element
(La, Y, and Ce) modified MgAl-hydrotalcites
of MgAlM were synthesized from coprecipitation and calcination, and
further loaded with CoMo active species to give CoMo/MgAlM catalysts.
X-ray powder diffraction, inductively coupled plasma, and N<sub>2</sub> adsorption isotherms indicate that MgAlM possess large BET surface
areas (58–91 m<sup>2</sup>/g), and rare earth elements were
successfully introduced into samples. CO<sub>2</sub>-TPD (temperature-programmed
desorption), NH<sub>3</sub>-TPD, H<sub>2</sub>-TPR (temperature-programmed
reduction), H<sub>2</sub>S-TPS (temperature-programmed sulfidation),
and Raman spectra indicate the presence of unique interactions between
rare earth elements and Mo active species, which strongly affect the
reduction and sulfidation behaviors of these catalysts. High resolution
transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy
(XPS) analysis suggest that the addition of rare earth elements decreases
the slab length and stacking numbers of MoS<sub>2</sub> and promotes
the sulfidation degree of Mo oxides. The above characteristics make
CoMo/MgAlM act as highly active catalysts for the water gas shift
reaction (WGSR). This work develops a facile and cost-effective method
for rational design of efficient catalysts for WGSR in industrial
processes