Abstract
In this study, Mn-MOF-74 was successfully synthesized and further modified via two paths for enhanced water resistance. The structure and morphology of the modified samples were investigated by a series of characterization methods. The results of selective catalytic reduction (SCR) performance tests showed that polyethylene oxide-polypropylene-polyethylene oxide (P123)-modified Mn-MOF-74 exhibited outstanding NO conversion of up to 92.1% in the presence of 5 vol.% water at 250 °C, compared to 52% for Mn-MOF-74 under the same conditions. It was concluded that the water resistance of Mn-MOF-74 was significantly promoted after the introduction of P123 and that the unmodified P123-Mn-MOF-74 was proven to be a potential low-temperature SCR catalyst.
Highlights
As one of the major air pollutants, nitrogen oxides (NOx ) are considered to cause a series of environmental problems, such as acid rain, smog, and greenhouse effects [1]
The patterns of -CH3 -functionalized Mn-metal–organic frameworks (MOFs)-74 are inconsistent with the standard pattern, which was probably caused by the synthesis method
The results suggest that the original spherical morphology of Mn-MOF-74 remained unchanged whether the water-in-oil surfactants P123 and PVP were introduced or ligand methyl functionalization was performed
Summary
As one of the major air pollutants, nitrogen oxides (NOx ) are considered to cause a series of environmental problems, such as acid rain, smog, and greenhouse effects [1]. It is of great importance to find a new type of catalyst which is able to effectively remove NOx at low temperature since the catalyst is located behind the desulfurizer and electrostatic precipitator system to reduce the cost of NH3 -SCR. A series of transition metal oxides such as MnOx , FeOx , CoOx , and CeOx supported on different carriers have been studied to raise low temperature activity [2,5,6]. Manganese-oxide-based catalysts have shown promising catalytic activity among the studied catalysts. The relatively lower specific surface area of traditional carriers might hinder the further application of manganese-oxide-based catalysts. It is especially important to find a carrier substitute with a large specific surface area
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