Performance of Mn-Ce-Fe/FA Catalysts on Selective Catalytic Reduction of NOX with CO under Different Atmospheres

Abstract

Gas turbines produce a large amount of NOx and CO due to high temperatures and insufficient combustion. Through the selective catalytic reduction of NO with CO (CO-SCR) in a gas turbine, the activities of the Mn-Fe-Ce/FA catalyst using fly ash (FA) as a carrier under different atmospheres were studied. The catalysts prepared by calcining different active materials under different atmospheres were used to analyze their denitrification abilities and resistance to water vapor. The denitrification performance of the catalyst prepared under reducing atmosphere is about 30 percent higher than that of the catalyst prepared under air atmosphere, and the decarburization performance is about 40 percent higher. In the presence of oxygen, the denitrification rate and decarburization rate of the 1:1 ratio of the Mn-Ce catalyst reach 67.16% and 59.57%, respectively. In an oxygen-containing atmosphere, the catalyst prepared by replacing Ce with Fe shows better denitrification and decarburization performances, which are 78.56% and 78.39%, respectively. When the flue gas space velocity is 4000 h−1 and the carbon-nitrogen ratio is 1.6, the catalyst shows better performance. After the water vapor is introduced, the denitrification and decarbonization rates of the catalyst decrease by about 10% and 9%, respectively. After ceasing water vapor, it rebounds by about 8%, and the activity could not be fully restored. However, the catalyst still shows strong water resistance in general.

Fabrication of Magnetic Core–Shell CZ/Fe3O4 Catalysts for Catalytic CO-SCR

“…So far, most of the research on iron-based catalysts has focused on Fe 2 O 3 (hematite), but the poor regeneration of Fe 2 O 3 affects the reuse of the material. 6,11 Therefore, nanomagnetic recyclable materials became popular. Among them Fe 3 O 4 (magnetite), the perfect ferrite material, has garnered a lot of interest because of its special qualities, which include superparamagnetism, low cost, high stability, ease of preparation, and environmental friendliness, which has been widely used as a catalyst, carrier, or sensor in recent years in research in the fields of environmental protection, catalysis, etc.…”

“…In recent years, iron-containing catalysts have attracted much attention due to their outstanding SCR performance, low cost, high selectivity to N 2 , and environmental performance, ,, In previous studies, a variety of mixed transition metal oxides were used as active components of the catalysts to promote the SCR reaction. So far, most of the research on iron-based catalysts has focused on Fe 2 O 3 (hematite), but the poor regeneration of Fe 2 O 3 affects the reuse of the material. , Therefore, nanomagnetic recyclable materials became popular. Among them Fe 3 O 4 (magnetite), the perfect ferrite material, has garnered a lot of interest because of its special qualities, which include superparamagnetism, low cost, high stability, ease of preparation, and environmental friendliness, which has been widely used as a catalyst, carrier, or sensor in recent years in research in the fields of environmental protection, catalysis, etc. − Fe 3 O 4 is paramagnetic and has a certain residual after magnetization with an external magnetic field .…”