Abstract
V2O5-WO3/TiO2 as a commercial selective catalytic reduction (SCR) catalyst usually used at middle-high temperatures was modified by loading of MnOx for the purpose of enhancing its performance at lower temperatures. Manganese oxides were loaded onto V-W/Ti monolith by the methods of impregnation (I), precipitation (P), and in-situ growth (S), respectively. SCR activity of each modified catalyst was investigated at temperatures in the range of 100–340 °C. Catalysts were characterized by specific surface area and pore size determination (BET), X-ray diffraction (XRD), temperature programmed reduction (TPR), etc. Results show that the loading of MnOx remarkably enhanced the SCR activity at a temperature lower than 280 °C. The catalyst prepared by the in-situ growth method was found to be most active for SCR.
Highlights
Nitrogen oxides (NOx) are significant atmospheric pollutants released from industrial facilities leading to a serious impact on both air quality and human health, such as acid rain, photo-chemical smog, and ozone hole [1,2]
We have introduced an in-situ growth method with an efficient and facile strategy avoiding thermal calcination to controllably prepare supported MnOx catalysts
Compared with the traditional impregnation method and the precipitation method, the modified catalyst prepared by the in-situ growth method has superior low-temperature selective catalytic reduction (SCR) performance
Summary
Nitrogen oxides (NOx) are significant atmospheric pollutants released from industrial facilities leading to a serious impact on both air quality and human health, such as acid rain, photo-chemical smog, and ozone hole [1,2]. Low-temperature (150–250 ◦C) SCR process is preferable because it avoids pre-heating of flue gas in many cases and matches with the existing burner systems [7] Owing to their particular features, various transition metals (Cr, Mn, Fe, Cu, and Ce) have been studied as the active components for SCR catalysts [8,9]. Mn-based catalysts are poisoned and subsequently inactivated in the environment of SO2 and H2O It seems to be an interesting work to combine the low-temperature SCR activity of MnOx and stable sulfur resistance of V2O5-based catalysts to obtain a new catalyst with reliable performance in a wider temperature range. The chemi-physical properties of the obtained catalyst and SCR performance were measured for evaluating the influence of the preparation method on catalyst’s performance, as well for the exploration into the structure–activity relationship (SAP)
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