Experimental and Modeling Study of CO-Selective Catalytic Reduction of NO Over Perovskite-Type Nanocatalysts

Abstract

In this work LaFeO3, LaFe0.7Mn0.3O3 and LaMn0.7Fe0.3O3 nanocatalysts with perovskite structures have been synthesized by sol-gel method. The selective catalytic reduction of NO with CO (CO-SCR) using synthesized nanocatalysts was investigated in a plug flow reactor. The kinetics of CO-SCR process was studied and three kinetic models were used to describe the behavior of the system, including power low model (PLM), kinetic model 1 (KM1) and kinetic model 2 (KM2). The KM1 was the best model with correlation coefficients of 0.9924, 0.9911 and 0.9902 and the sum of squared errors of 0.0504, 0.0488 and 0.0397, for LaFeO3, LaFe0.7Mn0.3O3 and LaFe0.3Mn0.7O3 catalysts, respectively. By comparing experimental results with the predicted results of the KM1, it was found that the proposed model can predict the performance of catalysts in the CO-SCR process with considerable precision. The structure and morphology of perovskite-type oxides were characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively.

Study of Ce, Ca, Fe, and Mn-Doped LaCoO3 Perovskite Oxide for the Four-Way Purification of PM, NOx, CO, and HC from Diesel Engine Exhaust

“…When the molar ratio of cobalt ions to nickel ions is 1:1, the purification efficiency of La 2 NiCoO 6 on PM can reach 98.2%. Shiva Abedi et al [9] synthesized LaFeO 3 , LaFe 0.7 Mn 0.3 O 3 , and LaMn 0.7 Fe 0.3 O 3 nano-scale perovskite-type catalysts with different doping amount by sol-gel method, the CO was used as a reducing agent to selectively reduce NO through simulation experiments, in addition to studying the function of synthesized catalysts and finding the optimal catalyst in the CO-SCR process by XRD, SEM characterization methods, and chemical reaction kinetic model. The results showed that the conversion efficiency of CO and NO increased with the synergistic effect of manganese ions and iron ions.…”

Three-Dimensional Spherical CuCoAlOx Catalyst with a Micro-/Nanoporous Structure for Low-Temperature CO-SCR Denitration

“…To date, many nanosized CO-SCR denitrification catalysts have been prepared using traditional synthesis methods, such as precipitation, , hydrothermal, , impregnation, , and sol–gel , methods. For instance, Ni­(Pt)/Al 2 O 3 catalysts were prepared by the sol–gel method, among which NiPt/Al 2 O 3 and Pt/Al 2 O 3 catalysts showed an excellent denitrification performance due to the interaction and synergy between Pt or Ni nanoparticles and the Al 2 O 3 carrier .…”