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Nitro aromatic waste water pollutants have become a serious issue, constituting a severe hazard to whole ecosystems and public health. Therefore, it is necessary to design high performance catalytic equipment for the reduction of nitroaromatic compounds from contaminated aqueous solutions. Herein, a robust and rapid method is developed to prepare a macroporous monolithic carbon foam with commercial melamine resin foam as the raw material. Then, the prepared monolithic carbon foam is exploited as an excellent 3D porous network to load Au NPs (MCF/Au). The as-prepared MCF/Au monolith can be innovatively utilized to construct a dynamic fixed-bed system. In addition, the as-obtained system exhibits exceptional catalytic reduction performance for 4-nitrophenol (4-NP). More importantly, the continuous flow reactor system shows excellent recyclability and can be reused for at least ten successive runs without apparent loss of activity. [ABSTRACT FROM AUTHOR]

Ti-Bearing blast furnace slag has been found to be suitable as the support of the selective catalytic reduction (SCR) catalysts. Mn–Ce–M (M = Fe, Co, Ag)/Slag catalysts prepared using a solution impregnation method for the low-temperature selective catalytic reduction (SCR) of NO with NH3 under the influence of transition metals were investigated in this study. The experiments suggested that the addition of Co can greatly enhance the SCR activity and the addition of Fe can broaden the SCR temperature range (NO conversion ＞90%), while the addition of Ag reduced the SCR activity. The XRD and SEM analyses revealed that for the Co and Fe doped catalysts, the active components were well dispersed, while the Ag doped catalyst had agglomeration and sintering. The XPS results revealed that the Fe and Co doped catalysts had relatively higher ratios of Mn4+/Mn3+, Ce3+/Ce4+ and Oα/Oα + Oβ. TPR results showed that the redox properties were enhanced after adding Co and Fe. NH3-TPD was also studied to investigate the acid sites over the surface of the catalysts. And the addition of Co and Fe increased strong acid sites on the surface of the catalyst. However, the strength of acid sites over the surface of the Ag doped catalyst was too high to cause the desorption of NH3. [ABSTRACT FROM AUTHOR]