Abstract
A series of composites of Mn-Fe-Ce/GO-x have been synthesized by a hydrothermal method. Their performance in simultaneously performing the catalytic oxidation of Hg0 and the selective catalytic reduction of nitrogen oxides (NOx) in the same temperature range were investigated. In order to investigate the physicochemical properties and surface reaction, basic tests, including Brunauer-Emmett-Teller (BET), XRD, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) were selected. The results indicate that the active components deposited on graphene play an important role in the removal of mercury and NOx, with different valences. Especially, the catalyst of Mn-Fe-Ce/GO-20% possesses an excellent efficiency in the temperature range of 170 to 250 °C. Graphene has a huge specific surface area and good mechanical property; thus, the active components of the Mn-Fe-Ce catalyst can be highly dispersed on the surface of graphene oxide. In addition, the effects of O2, H2O, NO and SO2 on the removal efficiency of Hg0 were examined in flue gas. Furthermore, the regeneration experiments conducted by thermal methods proved to be promising methods.
Highlights
In recent years, the removal of mercury and its derivatives has attracted significant attention due to their toxic effects on ecological safety and human health [1,2,3]
With the increase of graphene oxide (GO) content from 0 to 20%, the specific surface area, pore volume and pore diameter of the catalysts correspondingly increased further increasing the GO content to 30% resulted in a decrease of microstructural parameters due to the aggregation of GO
In3+addition, the catalyst has quite a high content of Mn and Mn3+ on the surface and ratios of (Mn + Mn )/Mn are in the Ce-Mn-Fe/GO-20% sample, which plays an important role in it shows good activity in nitrogen oxides (NOx) reduction with NH3 at low temperatures [38]
Summary
The removal of mercury and its derivatives has attracted significant attention due to their toxic effects on ecological safety and human health [1,2,3]. The commercial catalyst of V2 O5 -WO3 /TiO2 is widely used in the field of controlling NOx emission This catalyst is significantly affected by the flue gas temperature and loses its catalytic activities at low temperatures. Mn-Ce/TiO2 , Mn-Fe spinel and Ce-Fe-O were studied to enhance the performance of a single metal oxide for Hg0 and NOx removal [26,27,28]. Mn-Ce/TiO2 is highly effective in removing Hg0 and NOx , for the reason that the Mn oxides exhibit excellent catalytic activities at lower temperatures, and the Ce oxides can provide an amount of trapped oxygen for redox [29,30,31]. It is necessary to explore a catalyst that possesses inhibitory effects of SO2 and a high activity under different flue gas conditions. The outstanding performance was discussed in light of the test results and characterization techniques
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
