Mn Ce Research Articles

Catalytic oxidation of ethyl acetate on Ce–Mn–O catalysts modified by La

La/Ce0.5Mn0.5 catalysts prepared by wetness impregnation of Ce0.5Mn0.5 with La(NO3)3 (aq) were used in catalytic oxidation of ethyl acetate. Characterization by X-ray diffractometer (XRD), H2 temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS) and Raman shows that La/Ce0.5Mn0.5 catalysts have fluorite-like structure. La/Ce0.5Mn0.5 catalyst presents high activity with T90 (the temperature needed for 90% conversion) of 200 °C, where ethyl acetate is almost completely converted into CO2. The conversion at 195 °C maintains at 80% for at least 100 h. The intermediates were mainly ethanol and acetaldehyde whose amounts are below 250 × 10–6 and 16 × 10–6, respectively. In situ FTIR indicates that the modes of dissociative adsorption of ethyl acetate are related to surface oxygen species, which affect the stability of catalysts and the selectivity for ethanol and acetaldehyde intermediates.

Significantly enhanced Pb resistance of a Co-modified Mn–Ce–Ox/TiO2 catalyst for low-temperature NH3-SCR of NOx

Co modification can significantly improve the performance for low-temperature NH3-SCR of NOx and the Pb resistance of the Mn–Ce–Ox/TiO2 catalyst.

Ce-Mn coordination polymer derived hierarchical/porous structured CeO2-MnOx for enhanced catalytic properties.

Catalytic performance is largely dependent on how the structures/compositions of materials are designed. Herein, CeO2-MnOx binary oxide catalysts with a hierarchical/porous structure are prepared by a facile and efficient method, which involves the preparation of the hierarchical Ce-Mn coordination polymer (CPs) precursor, followed by a thermal treatment step. The obtained CeO2-MnOx catalysts not only well inherit the hierarchical structure of Ce-Mn CPs, but also possess porous and hollow features due to the removal of organic ligands and heterogeneous contraction during the calcination process. In addition, the effect of the Mn/Ce ratio is also studied to optimize catalytic performance. Specifically, the as-prepared CeO2-MnOx (5 : 5) catalyst exhibits excellent catalytic performance toward CO oxidation and selective catalytic reduction (SCR) of NO with NH3 at low temperatures. Based on the characterization results, we propose that the special hierarchical structure, high surface area, strong synergistic interaction between CeO2 and MnOx, and high content of active Ce3+, Mn4+ and Osurf are collectively responsible for its remarkable catalytic performance.

A-site-ordered quadruple perovskite manganite CeMn7O12 with trivalent cations

A-site-ordered quadruple perovskite CeMn7O12 – the first ternary oxide in the Ce–Mn–O system – was synthesized at high pressure of 6 ​GPa and high temperature of about 1670 ​K, and its structural, magnetic, and dielectric properties were investigated. CeMn7O12 crystallizes in space group Im-3 above 649 ​K, and in space group I2/m below 649 ​K. No other structural phase transitions were found down to 10 ​K. Crystal structures were investigated using synchrotron X-ray powder diffraction (a ​= ​7.50069 ​Å, b ​= ​7.36836 ​Å, c ​= ​7.49086 ​Å, β ​= ​91.2125° at 295 ​K and a ​= ​7.47367 ​Å ​at 700 ​K), and the structural parameters (Ce–O bond lengths) suggest the Ce3+ oxidation state giving the charge distribution as Ce3+Mn3+7O12. CeMn7O12 shows one long-range-ordered ferrimagnetic transition at TN ​= ​78 ​K accompanied by very weak kink-like dielectric anomalies. Strong dielectric relaxation due to extrinsic processes was observed near 18–35 ​K.

The Effect of Mn Content on Catalytic Activity of the Co–Mn–Ce Catalysts for Propane Oxidation: Importance of Lattice Defect and Surface Active Species

Composite oxide catalysts with Co/Mn/Ce molar ratio of 3:x:2(x = 1, 3, 5 and 7) have been successfully prepared by co-precipitation method. The crystal phase structure, elemental valence, oxygen vacancy and reductivity of the catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), H2 temperature program reduction(H2-TPR) and in situ DRIFTs. The results demonstrated that when x = 1, the Co–Mn–Ce catalyst had the smallest grain size and oxygen vacancy. A flow reactor experimental system was used to analyze the effect of Mn content on light-off temperature (T10) and complete oxidation temperature (T90) of propane oxidation over Co–Mn–Ce catalysts under anhydrous condition and 5% vol of water vapor. The results showed that when x = 1, the catalyst exhibits the highest activity (T10 = 200 °C, T90 = 307 °C) and water tolerance among the four catalysts. It indicated that when x = 1, the incorporation of Mn content can improve the ability of Co–Mn–Ce catalysts for propane oxidation. Based on the Langmuir–Hinshelwood theory, the surface chemical reaction pathway of propane oxidation was constructed and it revealed that the major active sites of Co–Mn–Ce catalysts mainly depend on surface oxygen vacancy and the surface active species (Mn4+,Oads).

Evaluation performance of Fe–Mn–Ce–O mixed metal oxides and Fe–Mn–Ce–O/Montmorillonite for adsorption of azo dyes in aqueous solution and oxidation reaction

The present study focused on synthesis of A–Fe–Mn–Ce–O, B–Fe–Mn–Ce–O and B–Fe–Ce–Mn–O/montmorillonite (B–Fe–Ce–Mn–O/MMT), (A and B differ in the method of preparation). The structure and morphology of the as-synthesized nanocomposites were characterized by FTIR, FESEM, XRD and EDX. The adsorption behavior of the prepared samples was tested through elimination of MB and RhB from aqueous solution. The effect of different parameters namely amount of adsorbent, pH, contact time, temperature, thermodynamics and equilibrium of adsorption were investigated. Based on the results, for A–Fe–Mn–Ce–O and B–Fe–Mn–Ce–O/MMT the adsorption process is endothermic, spontaneous and langmuier isotherm model best fitted the data. Comparison of the maximum adsorption capacity obtained for the adsorption of MB on synthetic adsorbents is as follows: B–Fe–Mn–Ce–O/MMT > A–Fe–Mn–Ce–O > B–Fe–Mn–Ce–O. In the next step, A–Fe–Mn–Ce–O, B–Fe–Mn–Ce–O and B–Fe–Ce–Mn–O/MMT were applied as catalysts in oxidation reaction. The investigation revealed that A–Fe–Mn–Ce–O catalyzed oxidation of benzyl alcohol with H2O2 as green oxidant yielded benzaldehyde (<99% selectivity) with 99% conversion. It was found that with B–Fe–Mn–Ce–O as catalyst, <99% conversion was achieved to <99% selectivity for 1-Phenyl-1,2-ethanediol. Comparison of the catalytic activity of the nanoparticles obtained in the oxidation reaction is as follows: A–Fe–Mn–Ce–O > B–Fe–Mn–Ce–O > B–Fe–Mn–Ce–O/MMT.

Highly thermal-sensitive robust LaTiSbO6:Mn4+ with a single-band emission and its topological architecture for single/dual-mode optical thermometry

Increasingly rigorous temperature detection applied to characterize physico-chemical state has stimulated thriving demands for contactless optical thermometry, which must overcome obstacles of complex preparation, low sensitivity, poor stability and inflexible design. Herein, a new optical thermal-sensitive LaTiSbO6:Mn4+ and its upgraded engineering frameworks are firstly constructed and systematically analyzed. The title phosphor exhibits specific single-band narrow emission (FWHM = ~31 nm) in deep-red region centered at 683 nm and superior thermal-sensitivity (SR = 2.75% K−1, 298–418 K) based on reliable fluorescence lifetime mode. Outstanding robustness of the phosphor concluded from aging experiment highlights the prerequisites of its practical duration and functional independence in diversified architecture. Through phosphor-in-glass (PiG) strategy, robust products are controllably organized without ascertainable interfacial reaction between introduced particles and glass matrix, yielding intriguing improved performance (SR = 3.01% K−1) inherited from LaTiSbO6:Mn4+. Moreover, fabricated heterogeneous PiG architecture, spatially confining LaTiSbO6:Mn4+ and YAG:Ce3+ to block unfavorable energy-transfer depletion, facilely accomplish dual-mode thermometry without significant mutual interference, integrating the Mn4+-lifetime and highly recyclable fluorescence intensity ratio (FIR) from the Ce–Mn non-thermally-coupled system. This work not only suggests LaTiSbO6:Mn4+ as a promising candidate, but also expands new horizons with the topological composite pathway toward rational designing and perfecting multi-mode thermometer or other versatile constructions.

Promotion effect and mechanism of MnOx doped CeO2 nano-catalyst for NH3-SCR

MnOx-CeO2 (denoted as Mn–Ce) nanorod and MnOx-CeO2 nanooctahedra catalysts were synthesized by the hydrothermal method and were used for selective catalytic reduction of NO with NH3. The catalytic performance tests showed that the NO removal efficiency of CeO2 catalysts was obviously improved after loading MnOx. The structure and properties of catalysts had been characterized by SEM、TEM、XRD、BET、XPS、H2-TPR、NH3-TPD and in situ DRIFTS. It was found that Mn–Ce catalyst were of uniform core-shell structure, higher concentrations of Mn4+ and Ce3+, better reducibility, the increase of weak acid sites. The results of in situ DRIFTS indicated that the NH3-SCR reaction should obey the E–R mechanism. Moreover, the promotion effect and mechanism of MnOx doped CeO2 was demonstrated, which improved the catalytic activity of Mn–Ce catalysts.

Precursor Effects on Catalytic Behaviors of Copper–Manganese–Cerium Ternary Oxides Pellets for Low-Temperature CO Oxidation

Catalytic oxidation of CO into CO2 using copper–manganese–cerium (Cu–Mn–Ce) ternary oxides pellets represents a promising strategy for CO abatement. In this work, Cu–Mn–Ce ternary oxides catalyst pellets were prepared with different precursors by combining the wet-mixing-kneading and extrusion-spheronization methods. Physicochemical properties of the catalyst pellets were characterized by N2 adsorption–desorption, X-ray diffraction, scanning electron microscopy, X-ray energy dispersive spectrometry, transmission electron microscopy, X-ray photoelectron spectroscopy and H2-temperature programmed reduction. CO oxidation performance of the catalyst pellets were investigated in 0.5%CO, 2.0%H2O and balanced air using a fixed-bed reactor. Effects of granulation and precursor on the structure–activity relationships of the catalyst pellets were studied. The granulation process will adversely affect the CO oxidation performance of the as-prepared Cu–Mn–Ce ternary oxides catalysts. The catalyst pellet derived from nitrate precursors (CuMnCe-N) exhibits excellent CO oxidation activity (T50 = 115 °C), good time-on-stream stability (retains about 97% conversion after 85 min of reaction tested) and superior kinetic performance (Ea = 40.32 kJ/mol). The excellent CO oxidation performance is associated with the formed Cu–Ce–O solid solution, enhanced reducibility and dual synergistic effects. Besides, the desired catalyst pellet possesses good mechanical properties with a high mechanical strength of 14.70 MPa and a low attrition rate of 9.46%. The results will provide important guidance for designing efficient catalysts for CO oxidation.

Characteristics of Ce–Mn film on 6061 alloys and its improved performance

HF2− was applied to accelerate the Ce–Mn film formation on 6061 Al alloy in the Ce3+–MnO4− solution. The process of film formation, the composition and structure of the film were analyzed by scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffractometer (XRD). The film formation process includes three stages. At the initial stage, a three-dimensional (3D) skeleton was formed quickly, and then the skeleton was fully filled with cerium oxide and manganese oxide, resulting in a dense structure. Subsequently, a new skeleton was formed and also filled. Al, Ce, O and Mn were detected in the film. Ce existed mainly in the form of Ce4+ (89%). The film existed in an amorphous form and was composed of ceria (cerium hydroxide), manganese dioxide and aluminum oxide. After electrostatically spraying fluorocarbon powder, the resultant products satisfied the required mechanical performance and exhibited almost non-filament corrosion compared with commercially available chromium-free conversion film. Its corrosion resistant time to acetate spray can reach 2000 h, which is consistent with that of fluorocarbon paint. The results showed that Ce–Mn film can offer an attractive prospect to eliminate volatile organic compounds (VOC) problem arisen by using fluorocarbon paint in the process of industrial production.

A Novel Porous Ceramic Membrane Supported Monolithic Cu-Doped Mn–Ce Catalysts for Benzene Combustion

Porous ceramic membranes (PCMs) are considered as an efficient hot gas filtration material in industrial systems. Functionalization of the PCMs with high-efficiency catalysts for the abatement of volatile organic compounds (VOCs) during dust elimination is a promising way to purify the industrial exhaust gases. In this work, we prepared PCMs (porosity: 70%) in a facile sintering process and integrated Cu-doped Mn–Ce oxides into the PCMs as monolithic catalysts by the sol–gel method for benzene oxidation. Through this method, the catalysts are dispersed evenly throughout the PCMs with excellent adhesion, and the catalytic PCMs provided more active sites for the reactant gases during the catalytic reaction process compared to the powder catalysts. The physicochemical properties of PCMs and catalytic PCMs were characterized systematically, and the catalytic activities were measured in total oxidation of benzene. As a result, all the prepared catalytic PCMs exhibited high catalytic activity for benzene oxidation. Significantly, the monolithic catalyst of Cu0.2Mn0.6Ce0.2/PCMs obtained the lowest temperature for benzene conversion efficiency of 90% (T90) at 212 °C with a high gaseous hourly space velocity of 5000 h−1 and showed strong resistance to high humidity (90 vol.%, 20 °C) with long-term stability in continuous benzene stream, which is caused by abundant active adsorbed oxygen, more surficial oxygen vacancy, and lower-temperature reducibility.

SO2 Resistance of Mn–Ce Catalysts for Lean Methane Combustion: Effect of the Preparation Method

Various catalysts were synthesized by the redox-precipitation (RP) and co-precipitation (CP) methods, and SO2 resistance of the catalysts for lean methane combustion was furtherly investigated. The catalysts before and after the reaction were characterized by XRD, XPS, SEM, FTIR, and H2-TPR. Under the circumstance of 80 ppm SO2, the methane conversion of MnCe-RP reduced by 1.08% within 20 h, much more excellent SO2 resistance than MnCe-CP (reduced by 62.45%). The excellent SO2 resistance of MnCe-RP was due to the excellent morphology, the redox-potential and the SO2 uptake of KxMn8O16 in the bulk and on the surface, oxidizing SO2 to sulfides, protecting the downstream catalyst. And the various sulfates were detected by X-ray diffraction (XRD) and Fourier transform-infrared spectroscopy (FT-IR), and reduced the activating sites of the catalysts. This work provided a general strategy to enhance SO2 resistance of the catalyst system for lean methane catalytic combustion, utilizing KxMn8O16 to remove SO2 and free from the poison of the downstream catalyst.

Effect of Glycine Addition on Physicochemical and Catalytic Properties of Mn, Mn–La and Mn–Ce Monolithic Catalysts Prepared by Solution Combustion Synthesis

Catalysts containing Mn, Mn–La and Mn–Ce oxides supported on ceramic honeycomb monoliths were prepared by excess-wet impregnation and solution combustion synthesis (SCS). In SCS, glycine was used as a fuel additive with variable concentration (fuel lean and fuel rich conditions). The catalysts were studied by BET, XRD, HRTEM, H2-TPR, and differential dissolution. Properties of the catalysts in the deep oxidation of butane were investigated. The best activity and stability were observed for the catalysts prepared by SCS under fuel rich conditions. Under these conditions, the active component is formed as highly dispersed particles of manganese oxides in the composition of simple and mixed oxides that are located in subsurface layers of the support. On the contrary, manganese oxides that are formed upon thermal treatment of the impregnation catalyst are located mostly in the bulk of the support. Reducing conditions of the SCS reaction lead to the formation of simple and mixed oxides where manganese is mostly in Mn3+ and Mn2+ oxidation states. The presence of reduced manganese species in the subsurface layers of support, which are accessible to reactants, provides high efficiency of SCS catalysts in the oxidation of butane.

Enhanced selective catalytic reduction of NO with NH3 via porous micro-spherical aggregates of Mn–Ce–Fe–Ti mixed oxide nanoparticles

We rationally designed a high performance denitration (De-NOx) catalyst based on a micrometer-sized spherical Mn–Ce–Fe–Ti (CP-SD) catalyst for selective catalytic reduction (SCR). This was prepared by a co-precipitation and spray drying (CP-SD) method. The catalyst was systematically characterized, and its morphological structure and surface properties were identified. Compare with conventional Mn–Ce–Fe–Ti (CP) catalysts, the Mn–Ce–Fe–Ti (CP-SD) catalyst had superior surface-adsorbed oxygen leading to enhanced “fast NH3-SCR” reaction. The as-obtained Mn–Ce–Fe–Ti (CP-SD) catalyst offered excellent NO conversion and N2 selectivity of 100.0% and 84.8% at 250 °C, respectively, with a gas hourly space velocity (GHSV) of 40,000 h−1. The porous micro-spherical structure provides a larger surface area and more active sites to adsorb and activate the reaction gases. In addition, the uniform distribution and strong interaction of manganese, iron, cerium, and titanium oxide species improved H2O and SO2 resistance. The results showed that the Mn–Ce–Fe–Ti (CP-SD) catalyst could be used prospectively as a denitration (De-NOx) catalyst.

Fe-Mn-Ce oxide-modified biochar composites as efficient adsorbents for removing As(III) from water: adsorption performance and mechanisms.

In this study, a novel Fe-Mn-Ce oxide-modified biochar composite (FMCBC) was synthesized via pyrolysis to enhance the adsorption capacity of biochar (BC). Scanning electron microscopy-energy-dispersive X-ray spectroscopy confirmed that Fe, Mn, and Ce were successfully loaded onto the surface of the BC. A series of adsorption experiments showed that the FMCBC exhibited improved adsorption of As(III) in an aqueous environment. The adsorption process was well expressed by the pseudo-second-order kinetic model. The adsorption capacity of FMCBC reached 8.74mgL-1, which was 3.27 times greater than that of BC. The pH of the solution significantly influenced the adsorption of As(III), where the amount of As(III) adsorbed by FMCBC was maximized at pH 3. A high phosphate concentration inhibited adsorption, whereas nitrate and sulfate ions promoted As(III) adsorption and increased the FMCBC adsorption capacity. Similarly, with increasing humic acid concentration, the adsorption capacity of FMCBC for As(III) decreased; however, a low concentration of humic acid promoted adsorption. X-ray photoelectron spectroscopy analysis revealed that the adsorption of As(III) by FMCBC occurred through redox and surface complexation reactions. Therefore, FMCBC has excellent potential for purifying arsenic-contaminated water.

High efficiency of Mn–Ce‐modified TiO2 catalysts for the low‐temperature oxidation of Hg0 under a reducing atmosphere

Manganese‐ and cerium oxide‐modified titania catalysts were prepared by the deposition precipitation for the removal of elemental mercury (Hg0) from simulated yellow phosphorus off‐gas at low temperature. In addition, these catalysts were characterized by X‐ray diffraction, Brunauer–Emmett–Teller measurements, X‐ray photoelectron spectroscopy and field‐emission scanning electron microscope to determine the surface morphology of the obtained compounds and explore their formation mechanism. The results revealed that a Mn–Ce loading and reaction temperature of 10% and 150 °C, respectively, as well as a Mn/Ce molar ratio of 2:1, led to an optimal efficiency for the oxidation of elemental mercury. Furthermore, the effects of flue gas components were investigated. The presence of O2 clearly promoted the oxidation of Hg0. A CO atmosphere did not affect the Hg0 oxidation, when compared with N2, whereas the presence of H2S and water vapor inhibited the oxidation process. Furthermore, the X‐ray photoelectron spectroscopy spectra of Hg 4f revealed that the elemental mercury adsorbed by the catalyst is present as HgO. Finally, the Hg0 catalytic oxidation mechanism was discussed on the basis of the experimental results and characterization analysis.

Performance of Low‐temperature SCR of NO with NH3 over MnOx/Ti‐based catalysts

ABSTRACTThe effects of Mn loadings and precursors, catalyst preparation methods, incineration durations and temperatures, and the addition of Co and Ce on NO‐reduction efficiency and selectivity (N2O formation) during the preparation of MnOx/Ti‐based catalysts were studied by micropore‐size analysis (XRD, XPS, SEM, and FTIR), while considering changeable parameters. Meanwhile, the performance of low‐temperature SCR of NO with NH3 over the designed catalysts was tested under various gas hourly space velocities (GHSVs), NH3/NO molar ratios, and contents of NO, NH3, O2, H2O, and SO2 in a lab‐scale reactor. Overall, the Mn(0.3)Ce(0.1)/Ti catalyst, which had high NO‐reduction efficiency and selectivity (low N2O formation), was recommended, with the following preparation methods: ultrasonic impregnation; manganese acetate precursor; and incineration at 500 °C. Appropriate textural properties (high surface area and small pore and crystallite sizes), well‐dispersed amorphous manganese (rather than crystalline) on the anatase surface (rather than rutile), abundant active sites, and long residence time are essential for high NO‐reduction efficiency. In practice, NO‐reduction efficiency decreased with increasing GHSV and the NH3 and NO contents; however, it initially increased and then became saturated with an increasing NH3/NO molar ratio and O2 content. Water deactivated the catalyst to a recoverable state, whereas SO2 resulted in unrecoverable deactivation.

Preparation of Ce⁻Mn Composite Oxides with Enhanced Catalytic Activity for Removal of Benzene through Oxalate Method.

The catalytic activities of CeO2-MnOx composite oxides synthesized through oxalate method were researched. The results exhibited that the catalytic properties of CeO2-MnOx composite oxides were higher than pure CeO2 or MnOx. When the Ceat/Mnat ratio was 3:7, the catalytic activity reached the best. In addition, the activities of CeO2-MnOx synthesized through different routes over benzene oxidation were also comparative researched. The result indicated that the catalytic property of sample prepared by oxalate method was better than others, which maybe closely related with their meso-structures. Meanwhile, the effects of synergistic interaction and oxygen species in the samples on the catalytic ability can’t be ignored.

Investigation of Two-Phase Intergrowth and Coexistence in Mn–Ce–Ti–O Catalysts for the Selective Catalytic Reduction of NO with NH3: Structure–Activity Relationship and Reaction Mechanism

TiO2-supported manganese catalysts have been widely investigated because of their unique catalytic properties. A series of Mn–Ce–Ti–O catalysts were synthesized by a modified sol–gel method. Mn atom doping into CT-0/1 samples results in anatase partly transforming into rutile and two-phase coexistence. X-ray photoelectron spectroscopy and NH3 temperature programmed desorption analysis show that the reactions of Mn3+ + Ti4+ ↔ Mn4+ + Ti3+ and Ce4+ + Mn3+ ↔ Ce3+ + Mn4+ happened, which is propitious to generating plentiful oxygen defects and chemical adsorbed oxygen and beneficial for the oxidation of NO to NO2. In addition, doping of Mn atoms could produce more acid sites and increase the ability of adsorption NH3 that reacted with NO2 to achieve high performance of deNOx in a wide temperature window. In situ diffusion reflectance infrared Fourier transform spectroscopy shows that MCT-15/1 achieves unpredictable NH3 selective catalytic reduction activity following transition from the Langmuir–Hinshelwood (L–...

Highly Dispersed Mn–Ce Binary Metal Oxides Supported on Carbon Nanofibers for Hg0 Removal from Coal-Fired Flue Gas

Highly dispersed Mn–Ce binary metal oxides supported on carbon nanofibers (MnOx–CeO2/CNFs(OX)) were prepared for Hg0 removal from coal-fired flue gas. The loading value of the well-dispersed MnOx–CeO2 was much higher than those of many other reported supports, indicating that more active sites were loaded on the carbon nanofibers. In the present study, 30 wt % metal oxides (15 wt % MnOx and 15 wt % CeO2) were successfully deposited on the carbon nanofibers, and the sorbent yielded the highest Hg0 removal efficiency (&gt;90%) within 120–220 °C under a N2/O2 atmosphere. An increase in the amount of highly dispersed metal oxides provided abundant active species for efficient Hg0 removal, such as active oxygen species and Mn4+ cations. Meanwhile, the carbon nanofiber framework provides the pathway for charge transfer during the heterogeneous Hg0 capture reaction processes. Under a N2+6%O2 atmosphere, a majority of Hg0 was removed via chemisorption reactions. The effects of flue gas composition were also investigated. O2 replenished the active oxygen species on the surface and thus greatly promoted the Hg0 removal efficiency. SO2 had an inhibitory effect on Hg0 removal, but NO facilitated Hg0 capture performance. Overall, carbon nanofibers seems to be a good candidate for the support and MnOx–CeO2/CNFs(OX) may be promising for Hg0 removal from coal-fired flue gas.