Improvement of low-temperature NH₃-SCR catalytic performance over nitrogen-doped MO_x–Cr₂O₃–La₂O₃/TiO₂–N (M = Cu, Fe, Ce) catalysts

Abstract

A series of MOx–Cr2O3–La2O3/TiO2–N (M = Cu, Fe, Ce) catalysts with nitrogen doping were prepared via the impregnation method.

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO2–ZrO2 catalyst for a low temperature NH3-SCR system

“…1,2 The selective catalytic reduction of NO x with NH 3 (NH 3 -SCR) is the most efficient and widely used technology for the control of NO x emission. 3,4 Traditional commercial vanadium-titanium catalysts have been used in various industrial elds due to their stability and high efficiency, but industrial application is still restrained by their inevitable drawbacks, including high operation temperature window, poisoning and deactivation of catalyst by deposited alkaline metal, and vanadium poisoning. [5][6][7] Therefore, it is necessary to develop NH 3 -SCR catalysts with excellent denitration activity in low temperature ranges.…”

Promotion effect of Co addition on the activity and SO2 tolerance of CrCe catalysts for selective catalytic reduction of NOx with NH3 at middle–low temperatures

“…Three peaks at 105, 246/258 and 626/735 °C were assigned to weak, medium and strong acid sites, respectively 33 . It is obvious that Co addition enhanced the peak intensities of CrCe catalyst, especially the peak attributed to strong acid sites, demonstrating that Co could provide more active sites and further promote NH 3 ‐SCR reaction on its surface 34 . Therefore, the 5CoCrCe catalyst exhibited higher catalytic activity than CrCe catalysts.…”

Tuning the catalytic properties of La–Mn perovskite catalyst via variation of A- and B-sites: effect of Ce and Cu substitution on selective catalytic reduction of NO with NH3

“…The average crystal size was calculated from the Scherrer equation. 6 The Scanning Electron Microscopy (SEM) images were taken with a Zeiss sigma 300 eld emission scanning electron microscope (Carl Zeiss AG, China) to study the morphology of catalysts.…”

“…3,4 Typical commercial vanadium-titanium catalysts (V 2 O 5 /TiO 2 and V 2 O 5 -WO 3 /TiO 2 ) have been commonly used in many industrial activities due to their stability and high efficiency, but are still restrained by their inevitable drawbacks such as vanadium toxicity, narrow and high operation temperature window, poisoning and deactivation of the catalysts by deposited alkaline metals. [5][6][7] Moreover, there is an increasing requirement for limiting NO x emission from industrial applications, which has made the development of NH 3 -SCR catalysts with excellent denitration activity a hot issue for decades.…”