LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

Abstract

A battery of agricultural straw derived biomass activated carbons supported LaOx modified MnOx (LaMn/BACs) was prepared by a facile impregnation method and then tested for the efficiency of simultaneous abatement of NO and Hg 0 . 15%LaMn/BAC manifested excellent removal efficiency of Hg 0 (100%) and NO (86.7%) at 180 °C, which also exhibited splendid resistance to SO2 and H2O. The interaction between Hg 0 removal and NO removal was explored, thereinto Hg 0 removal had no influence on NO removal, while NO removal preponderated over Hg 0 removal. The inhibitory effect of NH3 was greater than the accelerative effect of NO and O2 on Hg 0 removal. The physicochemical characterization of related samples were characterized by SEM, XRD, BET, H2-TPR, NH3-TPD and XPS. After incorporating suitable LaOx into 15%Mn/BAC, the synergistic effect between LaOx and MnOx contributed to the improvement of BET surface area and total pore volume, the promotion of redox ability, surface active oxygen species and acid sites, inhibiting the crystallization of MnOx. 15%LaMn/BAC has the best catalytic oxidation activity at low temperature. That might be answerable for superior performance and preferable tolerance to SO2 and H2O. Finally, the principle of catalytic oxidation was also discussesed in this article.

Excellent Performance and Feasible Mechanism of ErOx-Boosted MnOx-Modified Biochars Derived from Sewage Sludge and Rice Straw for Formaldehyde Elimination: In Situ DRIFTS and DFT

“…Therefore, these values demonstrate that Er was successfully loaded onto the BAC samples and participated in the catalytic oxidation reaction in the Er 3+ mode. Such binding energy values of Er 4d are consistent with those in perovskites [36]. All these phenomena testify that at least part of the Er 2 O 3 transformed into the perovskite-like structure of ErMnO 3 , which is consistent with the H 2 -TPR analysis.…”

“…Regarding 15%Er 0.5 Mn 0.5 /BAC, almost all surface areas were highly dispersed with metal oxides, with some agglomerating metal oxides and more agglomerates existing in 20%Er 0.5 Mn 0.5 /BAC. Consequently, the excess metal oxides destroyed some pre-existing pores due to more serious agglomerates [35,36]. This appearance also dovetailed with the frontal BET results.…”

“…The Mn 2p XPS spectra are revealed in Figure 6c, and the main finding is that the three peaks were located at 638.5-639.2 eV, 641.2-642.4 eV, and 645.1-646.3 eV, corresponding to Mn 2+ , Mn 3+ , and Mn 4+ , respectively [36,54]. This intimated that Mn existed in three valence conditions, Mn 2+ , Mn 3+ , and Mn 4+ , during the entire reaction process, where the sum of Mn 2+ + Mn 3+ + Mn 4+ can be defined as Mn n+ .…”