Exceptional Performance of 3D Additive Manufactured NiFe Phosphite Oxyhydroxide Hollow Tubular Lattice Plastic Electrode for Large-Current-Density Water Oxidization

In this article,we report a 3D NiFe phosphite oxyhydroxide plastic electrode using high-resolution digital light processing(DLP)3D-printing technology via induced chemical deposition method.The as-prepared 3D plastic electrode exhibits no template requirement,freedom design,low-cost,robust,anticorrosion,lightweight,and micro-nano porous characteristics.It can be drawn to the conclusion that highly oriented open-porous 3D geometry structure will be beneficial for improving surface catalytic active area,wetting performance,and reaction–diffusion dynamics of plastic electrodes for oxygen evolution reaction(OER)catalysis process.Density functional theory(DFT)calculation interprets the origin of high activity of NiFe(PO_(3))O(OH)and demonstrates that the implantation of the–PO_(3)can effectively bind the 3d orbital of Ni in NiFe(PO_(3))O(OH),lead to the weak adsorption of intermediate,make electron more active to improve the conductivity,thereby lowing the transform free energy of*O to*OOH.The water oxidization performance of as-prepared 3D NiFe(PO_(3))O(OH)hollow tubular(HT)lattice plastic electrode has almost reached the state-of-the-art level compared with the as-reported large-current-density catalysts or 3D additive manufactured plastic/metal-based electrodes,especially for high current OER electrodes.This work breaks through the bottleneck that plagues the performance improvement of low-cost high-current electrodes.

Mineralogical and micromorphological characteristics of Si-Fe-Mn oxyhydroxides from the PACMANUS hydrothermal field, Eastern Manus Basin

The mineralogical and micromorphological characteristics of Si-Fe-Mn oxyhydroxides from the dacite-hosted PACMANUS hydrothermal field were analyzed.The samples are poorly crystallized Si-Fe-Mn oxyhydroxides with minor birnessite, todorokite, nontronite, goethite, and opal-A.There are some microtextures which are rather like fossil microbes such as the filamentous silica and the hollow pipes.Flakes of nontronite crystals are found either forming a honeycomb texture or distrib- uted on the surface of the hollow pipes.Nontronite is the product precipitated from low-temperature hydrothermal fluids, and microbes may play a role in its formation.Si-Fe-Mn oxyhydroxides have two kinds of nuclei: Si-Mn nuclei and Si nuclei, both enveloped by the similar Si-Fe outer layer, existing in the rod-shaped oxyhydroxide and spheroidal oxyhydroxide, respectively.In the Si-Mn nuclei, the concentration of SiO2 is between 39.32 wt% and 86.31 wt%, and MnO concentration is between 4.97 wt% and 27.01 wt%, but Fe2O3 concentration is very low (0.54 wt%-3.43 wt%).In the Si nucleus the concentration of SiO2 is 90.17 wt%, but concentration of MnO and Fe2O3 are low, with 0.06 wt% and 3.47 wt%, respectively.The formation of the Si-Mn nucleus is closely related to microbes, whereas the Si nucleus is of inorganic origin.

Metal-oxoacid-mediated oxyhydroxide with proton acceptor to break adsorption energy scaling relation for efficient oxygen evolution

Metal oxyhydroxides(MOOH)generated from irreversible reconstructions of transition metal compounds are intrinsic active species for oxygen evolution reaction,whose activities are still constrained by sluggish deprotonation kinetics and inherent adsorption energy scaling relations.Herein,we construct a tunable proton acceptor(TPA)on oxyhydroxides by in-situ reconstruction of metal oxoacids such as NiC2O4to accelerate deprotonation and break adsorption energy scaling relations during OER.The modified C_(2)O_(4)^(2-)as a TPA can easily extract H of*OH(forming*HC2O4intermediate)and then promote deprotonation by the transmitted hydrogen bond with*OOH along conjugated(H...)O=C-O(-H)chain.As a result,Ni OOH-C2O4shows non-concerted proton-electron transfer and improved deprotonation rate,and delivers a good OER activity(270 mV@10 mA cm-2).The conjugate acidity coefficient(pKa)of the modified oxoacid group can be a descriptor for TPA selection.This TPA strategy can be universally applied to Co-,Fe-,and Ni-based oxyhydroxides to facilitate OER efficiency.

Pourbaix diagrams to decipher precipitation conditions of Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field

Utilizing Si, Fe and Mn concentrations within the end-member PACMANUS hydrothermal fluid, Si-Fe-Mn-H2O Pourbaix diagrams were constructed at 300℃and 25℃. ThePourbaix diagrams show that the main Si, Fe and Mn oxides species precipitating from the hydrothermal fluid were SiO2, Fe（OH）3, Fe3（OH）8, Mn3O4, and Mn2O3at 25℃. During mixing of hydrothermal fluid with seawater, SiO2 precipitated earlier than Fe-Mn-oxyhydroxides because of the lower stability boundary. Then Fe（OH）2 precipitated first, followed by Fe3（OH）8 and Fe（OH）3, and last, small amounts of Mn3O4 and Mn2O3 precipitated. Fe（OH）3was readily de-posited in alkaline solution with little influence by Eh. There were many Si-Fe-Mn-concentric particles in the polished sections of the massive precipitates collected from PACMANUS. In the concentric nucleus and ellipsoid, Si oxides precipitated first before the hydrothermal fluid had mixed with seawater. In the concen-tric nucleus, after the precipitation of Si oxides, the increase of pH and Eh promoted the precipitation of Mn oxides around the Si oxides. In the large ellipsoid, the precipitation of Fe was divided into two periods. In the early period, increase of pH value of hydrothermal fluid produced by low-temperature convection and an input of a small volume of seawater promoted a small amount of Fe（OH）3 to precipitate in the Si-rich core. In the late period, after complete mixing with seawater and the resultant fluid was close to neutral or slightly alkaline in pH, Fe（OH）3was easily precipitated from the solution and distributed around the Si-rich core.

Characteristics of Sr, Nd and Pb isotopic compositions of hydrothermal Si-Fe-Mn-oxyhydroxides at the PACMANUS hydrothermal field, Eastern Manus Basin

Si-Fe-Mn-oxyhydroxides dredged at the PACMANUS （Papua New Guinea-Australia-Canada-Manus） hydrothermal field, Eastern Manus Basin, have 87Sr/SSSr=0.708 079-0.708 581; eNd=5.149 833-6.534 826; 208pb/204pb=38.245-38.440; 207pb/204pb=lS.503-15.560; 206pb/204pb=lS.682-18.783. s7sr/sSSr isotope ratios are relatively homogeneous and close to the value of the surrounding seawater （0.709 16）. The content of Sr in the samples contributed by seawater was estimated to be 76.7%-83.1% of total amount. The mixing temperature of hydrothermal fluids and seawater were ranging from 53.2℃ to 72.2℃ and the hydrothermal activities were unstable when the samples precipitated. The eNd values of all the samples are positive, which differ from the values of ferromanganese nodules （crusts） with hydrogenic origin. Nd was mainly derived from substrate rocks leached by hydrothermal circulation and preserved the hydrothermal signature. Ph isotopic compositions of most samples show minor variability except Sample #9-2 that has relatively high values of Pb isotopes. The Pb may be derived from the Eastern Manus Basin rocks leached by the hydrothermal fluid. The slightly lower 28pb/204pb and 207pb/204pb values of the samples indicated that the hydrothermal circulation in PACMANUS was not entire and sufficient, or that hydrothermal circulation had transient changes in the past. Si-Fe-Mn-oxyhydroxides in the samples preserved the heterogeneities of local rocks.

Mn化合物结构对Fe-Mn基钢钝化膜耐蚀性的影响

利用阳极极化曲线、俄歇电子能谱(AES)以及X射线光电子谱(XPS)测试技术研究Fe-25Mn和Fe-24Mn-4Al-5Cr钢分别在1 mol/L Na_(2)SO_(4)溶液和30%NaOH溶液中的钝化行为、钝化膜的成分及钝化膜的结构变化,得出Mn化合物结构对Fe-Mn基钢钝化膜耐蚀性的影响规律。研究结果表明:在1 mol/L Na_(2)SO_(4)溶液中,Fe-25Mn钢处于活化溶解状态,Fe-24Mn-4Al-5Cr钢则呈现钝化状态,钝化膜中Mn元素贫乏,Al、Cr元素富集;钝化膜主要由致密的Al_(2)O_(3)和Cr_(2)O_(3)组成,结构疏松的Mn_(2)O_(3)发生溶解,降低了Fe-Mn基钢钝化膜耐蚀性。在30%NaOH溶液中,Fe-25Mn钢表现出与Fe-24Mn-4Al-5Cr钢相近的钝化能力,钝化膜中只出现Mn元素的富集,结构致密的Mn(OH)_3是钝化膜的有效保护组分,显著提高了Fe-Mn基钢钝化膜的耐蚀性。

Annealing temperature dependent catalytic water oxidation activity of iron oxyhydroxide thin films

Nanostructured iron oxyhydroxide（Fe OOH） thin films have been synthesized using an electrodeposition method on a nickel foam（NF） substrate and effect of air annealing temperature on the catalytic performance is studied. The as-deposited and annealed thin films were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）, field emission scanning electron microscopy（FE-SEM） and linear sweep voltammetry（LSV） to determine their structural, morphological, compositional and electrochemical properties, respectively. The as-deposited nanostructured amorphous Fe OOH thin film is converted into a polycrystalline Fe;O;with hematite crystal structure at a high temperature. The Fe OOH thin film acts as an efficient electrocatalyst for the oxygen evolution reaction（OER） in an alkaline 1 M KOH electrolyte. The film annealed at 200 °C shows high catalytic activity with an onset overpotential of 240 m V with a smaller Tafel slope of 48 m V/dec. Additionally, it needs an overpotential of 290 mV to the drive the current density of 10 m A/cm;and shows good stability in the 1 M KOH electrolyte solution.

Bimetallic Oxyhydroxide as a High-Performance Water Oxidation Electrocatalyst under Industry-Relevant Conditions

Developing high-performing oxygen evolution reaction(OER)electrocatalysts under high-current operation conditions is critical for future commercial applications of alkaline water electrolysis for clean energy generation.Herein,we prepared a three-dimensional(3D)bimetallic oxyhydroxide hybrid grown on a Ni foam(NiFeOOH/NF)prepared by immersing Ni foam(NF)into Fe(NO_(3))_(3) solution.In this unique 3D structure,the NiFeOOH/NF hybrid was composed of crystalline Ni(OH)_(2) and amorphous FeOOH evenly grown on the NF surface.As a bimetallic oxyhydroxide electrocatalyst,the NiFeOOH/NF hybrid exhibited excellent catalytic activity,surpassing not only the other reported Ni–Fe based electrocatalysts,but also the commercial Ir/C catalyst.In situ electrochemical Raman spectroscopy demonstrated the active FeOOH and NiOOH phases involved in the OER process.Profiting from the synergy of Fe and Ni catalytic sites,the NiFeOOH/NF hybrid delivered an outstanding OER performance under challenging industrial conditions in a 10.0 mol·L^(-1) KOH electrolyte at 80℃,requiring potentials as small as 1.47 and 1.51 V to achieve the super-high catalytic current densities of 100 and 500mA∙cm^(-2),respectively.

Silicon isotope fractionation during the precipitation of quartz and the adsorption of H_4SiO_(4(aq))on Fe(Ⅲ)-oxyhydroxide surfaces

Equilibrium Si isotope fractionation factors among orthosilicic acid(i.e.,H4 Si O4(aq)), quartz and the adsorption complexes of H4 Si O4(aq)on Fe(III)-oxyhydroxide surface were calculated using the full-electron wave-function quantum chemistry methods [i.e., B3LYP/6-311G(2df,p)]with a new cluster-model-based treatment. Solvation effects were carefully included in our calculations via water-droplet method combined with implicit solvent models(e.g., PCM).The results revealed that, if it is under equilibrium conditions,heavy Si isotopes would be significantly enriched in quartz in comparison to H4 Si O4(aq). However, most of the field observations suggested that quartz would have identical or even depleted d30 Si values compared to that of H4 Si O4(aq). To explain this discrepancy between the equilibrium calculation results and the field observations, the kinetic isotope effect(KIE) associated with the formation of amorphous silica,which usually is the precursor of crystalline quartz, was investigated using quantum chemistry methods. The KIE results showed that amorphous silica would be significantly enriched in light Si isotopes during its formation. Our equilibrium fractionation results, however, matched a special type of quartz(i.e., Herkimer ‘‘diamond'') very well, due to its nearly equilibrated precipitation condition. Opposite to the case of precipitated quartz, a large equilibrium Si isotope fractionation(i.e.,-3.0 %) was found between the absorbed bidentate Si surface complexes(i.e.,2C [ Fe2O2Si(OH)2) and H4 Si O4(aq). This calculated equilibrium Si isotope fractionation factor largely differed from a previous experimental result(ca.-1.08 %). We found that the formation of transient or temporary surface complexes [e.g.,1V [ Fe2OSi(OH)3] may have accounted for the smaller net fractionation observed.With the equilibrium and kinetic Si isotope fractionation factors provided here, the distributions and changes of Si isotope compositions in the Earth's surface systems can be better understood.

Improving Electrochemical Performance of Cellulose Fiber-based Supercapacitor Electrode Using Polypyrrole-wrapped Iron Oxyhydroxide

Polypyrrole(PPy)@cellulose fiber-based composites have been widely investigated as electrode materials for use in flexible supercapacitors.However,they cannot readily provide high specific capacitance and cyclic stability owing to their inherent drawbacks,such as high resistance,Weber impedance,and volume expansion or collapse during charging/discharging.In this study,iron oxyhydroxide(FeOOH)is incorporated in the abovementioned composite to decrease the equivalent series resistance,charge transfer resistance,and Weber impedance,thereby enhancing electron transfer and ion diffusion,which results in superior electrochemical performance.The PPy-wrapped FeOOH@cellulose fiber-based composite electrode with the molar ratio of FeSO_(4) to NaBH4 of 1∶1 exhibits a high specific capacitance of 513.8 F/g at a current density of 0.2 A/g,as well as an excellent capacitance retention of 89.4% after 1000 cycles.

Fe-Mn/AC催化H_(2)O_(2)降解染料废水

通过浸渍法制备的Fe-Mn/AC催化剂以活性炭作为载体,用于降解染料废水。利用SEM手段研究了Fe-Mn/AC催化剂的结构特征。阐述了染料废水的处理方法及制备方法。以甲基橙溶液模拟染料废水,研究了染料废水pH值、染料废水初始浓度、催化剂投加量、H_(2)O_(2)浓度对催化剂催化H_(2)O_(2)降解染料废水的影响。实验结果显示,pH值为3,催化剂投加量为0.2g,染料废水初始浓度为50mg/L,H_(2)O_(2)浓度为7.5mmol/L为最佳反应条件。在最优条件下,通过3h的吸附降解处理,染料废水的去除率达到98%。

Bicarbonate levels in hemodialysis patients switching from lanthanum carbonate to sucroferric oxyhydroxide

AIM To examine possible alterations in acid-base parameters in patients switching from lanthanum carbonate(LanC) to sucroferric oxyhydroxide(SFOH). METHODS Fifteen stable hemodialysis patients were switched from LanC to SFOH. Only nine continued on SFOH, three returned to LanC and the other three switched to sevelamer carbonate. The later six patients served as a control group to the SFOH group of nine patients. Blood was sampled on the 3-d and the last 2-d interval of the week prior to switching and six weeks after. Bicarbonate levels(HCO_3^-), pH, pO_2, pCO_2 were measured, and the mean of the two measurements(3-d and 2-d interval) was calculated. RESULTS Comparing pre-switching to post-switching measurementsin the SFOH group, no statistically significant differences were found in any of the parameters studied. The mean pre-switching HCO_3^-was 22.41 ± 1.66 mmol/L and the mean post-switching was 22.62 ± 2.25 mmol/L(P = 0.889). Respectively, the mean pH= 7.38 ± 0.03 vs 7.39 ± 0.03(P = 0.635), mean pCO_2= 38.41 ± 3.29 vs 38.37 ± 3.62 mmHg(P = 0.767), and Phosphate = 1.57 ± 0.27 vs 1.36 ± 0.38 mmol/L(P = 0.214). There were not any significant differences when we performed the same analyses in the control group or between the SFOH group and control group. No correlations were found, either between pre-switching LanC daily dose or between postswitching daily dose of the new binder and the measured parameters.CONCLUSION In our small study, switching from LanC to SFOH did not have any significant effect on blood bicarbonate levels and gas analysis, indicating that there is no need to change hemodialysis prescription regarding these parameters.

Copper‐doped nickel oxyhydroxide for efficient electrocatalytic ethanol oxidation

Rational design of low‐cost and efficient electrocatalysts for ethanol oxidation reaction(EOR)is imperative for electrocatalytic ethanol fuel cells.In this work,we developed a copper‐doped nickel oxyhydroxide(Cu‐doped NiOOH)catalyst via in situ electrochemical reconstruction of a NiCu alloy.The introduction of Cu dopants increases the specific surface area and more defect sites,as well as forms high‐valence Ni sites.The Cu‐doped NiOOH electrocatalyst exhibited an excellent EOR performance with a peak current density of 227 mA·cm^(–2)at 1.72 V versus reversible hydrogen electrode,high Faradic efficiencies for acetate production(>98%),and excellent electrochemical stability.Our work suggests an attractive route of designing non‐noble metal based electrocatalysts for ethanol oxidation.

Synthesis of hierarchical transition metal oxyhydroxides in aqueous solution at ambient temperature and their application as OER electrocatalysts

First-row(3 d)transition metal oxyhydroxides have attracted increasing attention due to their various advantages.Although investigating the oxidation mechanism and processing such materials into hierarchical architectures are greatly desired for their further development,it remains unclear how the oxidation state change occurs,and efforts to produce hierarchical oxyhydroxides in compliance with high ecological and economic standards have progressed slowly.Here,we describe a facile one-step coprecipitation route for the preparation of hierarchical CoOOH,NiOOH and MnOOH,which involves the diffusion of NH_(3)originating from ammonium hydroxide solution into an aqueous solution containing metal ion salts and K_(2)S_(2)O_(8).Comprehensive characterizations by scanning electron microscope,transmission electron microscopy,X-ray diffraction analysis,X-ray photoelectron spectroscopy,ultraviolet-visible spectroscopy and in situ p H measurement demonstrated that K_(2)S_(2)O_(8)induces the oxidation state change of metal ion species after the start of hydrolysis.Meanwhile,it was found that,benefiting from the OH–concentration gradient created by the NH_(3)diffusion method and the suitable growth environment provided by the presence of K_(2)S_(2)O_(8)(high nucleation rate and secondary nucleation),the formation of hierarchical oxyhydroxide structures can be realized in aqueous solution at ambient temperature without the use of heat energy and additional structure-directing agents.The hierarchical CoOOH structures are performed as the electrocatalysts for the oxygen evolution reaction in alkaline media,which exhibit good activity with an overpotential of 320 m V at 10 m A cm^(-2)and a low Tafel slope of 59.6 m V dec^(–1),outperforming many congeneric electrocatalysts.Overall,our study not only provides important insights to understand the formation mechanism of hierarchical oxyhydroxides,but also opens up new opportunities for the preparation of hierarchical oxyhydroxides via a facile,green and low-cost method.

Iron-induced 3D nanoporous iron-cobalt oxyhydroxide on carbon cloth as a highly efficient electrode for oxygen evolution reaction

The development of highly efficient and cost-effective electrode materials for catalyzing the oxygen evolution reaction(OER)is crucial for water splitting technology.The increase in the number of active sites by tuning the morphology and structure and the enhancement of the reactivity of active sites by the incorporation of other components are the two main strategies for the enhancement of their catalytic performance.In this study,by combining these two strategies,a unique three-dimensional nanoporous Fe-Co oxyhydroxide layer coated on the carbon cloth(3D-FeCoOOH/CC)was successfully synthesized by in situ electro-oxidation methods,and directly used as a working electrode.The electrode,3D-FeCoOOH/CC,was obtained by the Fe doping process in(NH4)2Fe(SO4)2,followed by continuous in situ electro-oxidization in alkaline medium of“micro go chess piece”arrays on the carbon cloth(MCPAs/CC).Micro characterizations illustrated that the go pieces of MCPAs/CC were completely converted into a thin conformal coating on the carbon cloth fibers.The electrochemical test results showed that the as-synthesized 3D-FeCoOOH/CC exhibited enhanced activity for OER with a low overpotential of 259 mV,at a current density of 10 mA cm^–2,and a small Tafel slope of 34.9 mV dec^–1,as well as superior stability in 1.0 mol L^–1 KOH solution.The extensive analysis revealed that the improved electrochemical surface area,conductivity,Fe-Co bimetallic composition,and the unique 3D porous structure together contributed to the enhanced OER activity of 3D-FeCoOOH/CC.Furthermore,the synthetic strategy applied in this study could be extended to fabricate a series of Co-based electrode materials with the dopant of other transition elements.

价态与晶型对镍钴氢氧化物超级电容性能的影响

镍钴氢氧化物(羟基氧化物)的金属价态和晶型结构均具有多变性,研究金属价态和晶型结构对其超级电容性能的影响具有重要意义。通过调控强氧化剂过硫酸铵((NH_(4))_(2)S_(2)O_(8)),制备一系列不同价态(Ni^(2+),Ni^(3+),Co^(2+),Co^(3+))比例和晶型结构的镍钴氢氧化物活性材料。采用XRD,TEM,Raman,XPS等方法对材料价态、微观形貌和物相组成进行表征,明确其结构和价态性质。在1 A/g电流密度下,NiOOH-Co(OH)_(2)活性材料比容量高达260 C/g,远优于其他价态比例和晶型结构的3种电极材料性能。在2 A/g电流密度下充放电循环测试2000次后,比容量保持率为70.7%。经分析发现,NiOOH-Co(OH)2性能较优可归结于γ-NiOOH优良的导电性和α-Co(OH)_(2)较高的电容性能。

Fe-Mn合金层错能的嵌入原子法计算

运用嵌入原子法 (EAM)计算了 Fe- Mn合金层错能 (SFE) .采用 Johnson截断修正模型计算的结果表明 ,Fe- Mn合金的层错能随 Mn含量的增加而线性增大 .该趋势与本文实验结果一致 ,而且 Fe- 2 0 Mn(原子分数 ,% )合金中的层错能计算结果 (2 8m J/m2 )与 Kato等的热力学计算结果(2 6m J/m2 )较为吻合 .当 a(Mn) =2 0 %～ 55%时 ,γ相的层错能可表达为 :SFE(m J/m2 ) =2 3.3+0 .2 69×a(Mn) % .

焙烧温度对Fe-Mn催化剂结构和F-T合成性能影响

研究了焙烧温度对Fischer Tropsch(F T)合成Fe Mn催化剂的织构性质、还原行为以及在还原和反应过程中结构变化的影响;在H2 CO=2.0、260℃、2.5MPa和1000h-1条件下在固定床反应器上考察了焙烧温度对Fe Mn催化剂F T合成反应活性、烃产物选择性和运行稳定性的影响。XRD和TPR结果表明,随着焙烧温度的升高,催化剂中α Fe2O3晶粒增大,催化剂比表面积降低,促进Mn3+渗入α Fe2O3晶格中,形成了铁锰固溶体物相,使得催化剂难于还原,当焙烧温度升高到700℃时,催化剂中的α Mn2O3相完全消失。催化剂F T合成反应评价表明,在不降低催化剂活性的同时,焙烧温度的升高可显著地提高催化剂的反应运行稳定性,并促使烃产物分布向高碳数方向偏移;600℃焙烧的Fe Mn催化剂运行200h,总体活性高,失活速率较低,对低碳烯烃和中间馏分油段产物选择性好。

深冷处理和温度对Fe-Mn合金阻尼性能的影响

通过测定Fe-Mn合金的层错几率以及借助G—L位错脱钉模型,研究了深冷处理和温度对其阻尼性能的影响。进一步揭示了Re-Mn合金的高阻尼机制.采用倒扭摆测试合金的阻尼性能、SEM观察显微组织、XRD测定物相体积分数和层错几率.结果表明,Fe-Mn合金的高阻尼机制与Shockley不全位错的脱钉运动相关;深冷处理增加了合金的层错几率,即增加了Shockley不全位错数量。阻尼性能得到提高;升高温度降低了Shockley不全位错的脱钉力,在一定应变振幅下,温度越高可以产生脱钉的Shockley不全位错数量就越多,合金的阻尼性能升高.

水热法Fe-Mn催化剂制备及其合成气制低碳烯烃催化活性

以水热合成法制备了K原位改性的Fe-Mn催化剂,考察了其CO加氢合成低碳烯烃催化活性.采用SEM、TEM、XRD、H2-TPR和FT-IR等手段对催化剂进行了表征.结果表明,制备的催化剂前驱体呈50 ～ 70 nm的球形颗粒,表面富含羰基和羟基,物相组成以Fe3O4为主,用于反应后有Fe5C2和MnCO3相生成.与共沉淀法制备催化剂相比,在设定的反应条件下,不同K含量改性的催化剂均具有较高的活性,以原料配比Fe：Mn∶C6：K=3∶1∶5∶0.10的催化剂性能最佳,CO转化率达95.02％,总低碳烯烃收率为62.86 g/m3（H2＋CO）,CH4和CO2选择性分别为13.88％和13.98％.