3 research outputs found
Improvement in the Water Tolerance of SiO<sub>2</sub>‑Modified Semicoke Catalysts for the Low-Temperature NO + CO Reaction
Activated semicoke
(ASC) was modified with 3 wt % SiO<sub>2</sub> and loaded with Fe-Co
mixed oxides. This prepared catalyst exhibited
excellent denitrification (deNO) activity, even when the flue gas
contained 10 vol % water vapor, from 150 to 300 °C. To understand
the water resistance mechanism, the catalysts were characterized by
scanning electron microscopy, energy-dispersive X-ray spectroscopy,
X-ray diffraction, and Raman, X-ray, Fourier-transform infrared, and
UV–vis spectroscopies, and H<sub>2</sub>-temperature-programmed
reduction, as well as NO and/or water adsorption testing. In addition,
quantum mechanical calculations were performed. The results indicate
that the SiO<sub>2</sub> doped onto the semicoke surface repels both
water and NO molecules. However, the repulsive force toward NO is
smaller, resulting in the adsorption of NO on the surface, while the
adsorption of water was reduced. The reduction in the quantity of
adsorbed water improved the water tolerance of the catalysts significantly.
The adsorption results demonstrate that, when the water adsorption
was less than 0.345–0.442%, water vapor had no influence on
the deNO activity of ASC supported catalysts
Improvement in the Water Tolerance of SiO<sub>2</sub>‑Modified Semicoke Catalysts for the Low-Temperature NO + CO Reaction
Activated semicoke
(ASC) was modified with 3 wt % SiO<sub>2</sub> and loaded with Fe-Co
mixed oxides. This prepared catalyst exhibited
excellent denitrification (deNO) activity, even when the flue gas
contained 10 vol % water vapor, from 150 to 300 °C. To understand
the water resistance mechanism, the catalysts were characterized by
scanning electron microscopy, energy-dispersive X-ray spectroscopy,
X-ray diffraction, and Raman, X-ray, Fourier-transform infrared, and
UV–vis spectroscopies, and H<sub>2</sub>-temperature-programmed
reduction, as well as NO and/or water adsorption testing. In addition,
quantum mechanical calculations were performed. The results indicate
that the SiO<sub>2</sub> doped onto the semicoke surface repels both
water and NO molecules. However, the repulsive force toward NO is
smaller, resulting in the adsorption of NO on the surface, while the
adsorption of water was reduced. The reduction in the quantity of
adsorbed water improved the water tolerance of the catalysts significantly.
The adsorption results demonstrate that, when the water adsorption
was less than 0.345–0.442%, water vapor had no influence on
the deNO activity of ASC supported catalysts