15843-42-2Relevant articles and documents
A novel vertical attenuated total reflectance photochemical flow-through reaction cell for Fourier transform infrared spectroscopy.
Borda, Michael J,Strongin, Daniel R,Schoonen, Martin A
, p. 1103 - 1106 (2003)
A unique photochemical cell design and two experiments are presented, which illustrate the usefulness of flow-through attenuated total reflectance (ATR) Fourier transform infrared (FT-IR) spectroscopy as a technique for investigating photochemical reactions at the mineral-water interface. The kinetics of the photolysis reaction of potassium oxalate (K(2)C(2)O(4)) in a ferric iron solution and oxalate adsorbed onto goethite (alpha-FeOOH) were investigated to show the capabilities of the cell. Due to complicated kinetics, the adsorption experiment demonstrates not only the types of complex problems, that may exist at the mineral-water interface, but also the ability for this novel cell design to address them. Copyright 2002 Elsevier Science B.V.
Phase transformation of FeC2O4 · 2H2O heat treated in H2/NH3
Xue,Li,Kong,Yang
, p. 461 - 465 (1996)
The phase transformation of FeC2O4 · 2H2O heat treated in H2/NH3 is studied with differential scanning calorimetry (DSC), X-ray diffraction (XRD) and Mossbauer spectroscopy. The results indicate that
Studies on iron (Fe3+/Fe2+) -Complex/bromine (Br 2 Br-) redox flow cell in sodium acetate solution
Wen,Zhang,Qian,Zhou,Zhao,Yi,Yang
, p. A929-A934 (2006)
The formal potential of the Fe(III)Fe(II) couple shifts markedly in the negative direction by complexation with ethylenediamine tetraacetate (EDTA), oxalate, and citrate. The potentials of the complexes with EDTA and oxalate are less pH-dependent than wit
Formation and transformation kinetics of amorphous iron(III) oxide during the thermally induced transformation of ferrous oxalate dihydrate in air
Koga, Nobuyoshi,Sato, Yuka
, p. 141 - 151 (2011)
Focusing on the formation and transformation of amorphous Fe 2O3 in the course of the thermally induced transformations of ferrous oxalate dehydrate in air, the kinetics and physico-geometric mechanisms of the respective reaction ste
Improving the rate capability of LiFePO4 electrode by controlling particle size distribution
Zhang, Yin,Alarco, Jose A.,Nerkar, Jawahar Y.,Best, Adam S.,Snook, Graeme A.,Talbot, Peter C.
, p. A4128 - A4135 (2019)
In this study, the rate performance of a LiFePO4 (LFP) electrode has been enhanced by optimization of the particle size distribution of the LFP particles. Two LFP samples with different particle sizes (～50 and ～350 nm) are mixed with various ratios and the electrochemical performance has been evaluated. Reduction of the contact resistance and increase of the Li diffusion coefficient have been achieved. The electrode with a mixing ratio of 50:50 shows an improved initial capacity at C/10 and superior rate capability compared with the two pristine materials.
Oxalic acid complexes: Promising draw solutes for forward osmosis (FO) in protein enrichment
Ge, Qingchun,Chung, Tai-Shung
, p. 4854 - 4857 (2015)
Highly soluble oxalic acid complexes (OACs) were synthesized through a one-pot reaction. The OACs exhibit excellent performance as draw solutes in FO processes with high water fluxes and negligible reverse solute fluxes. Efficient protein enrichment was achieved. The diluted OACs can be recycled via nanofiltration and are promising as draw solutes.
Synthesis, spectral studies, spin cross-over in mixed ligand complexes of iron(II) and the influence of solvent on magnetic behaviour
Balasubramanian
, p. 377 - 394 (1999)
Mixed ligand complexes of iron(II) with polypyridine ligands like 1,10-phenanthroline (phen), 2,2′-bipyridine (bpy) and oxalic acid (ox) have been synthesized, viz. [Fe(phen)2ox]. 5.2H2O and [Fe(bpy)1.04(ox)1.1]
Multilayer iron oxalate with a mesoporous nanostructure as a high-performance anode material for lithium-ion batteries
Zhang, Keyu,Liang, Feng,Wang, Yunke,Dai, Yongnian,Yao, Yaochun
, p. 91 - 99 (2019)
In the search to improve the irreversible capacity of transition-metal oxalates, iron oxalate with a multilayer and mesoporous nanostructure has been produced via a liquid-phase precipitation method with the use of a solvent. The feeding sequence and self-assembly, considering hydrophobic interlamination interactions and the interconnection between ethanol molecules and the crystallographic planes, have been investigated to determine their influence on the customized structure and morphology. The unique structural organization significantly improves the electrochemical properties to achieve a high discharge capacity of ～1521.2 mAh g?1 at 1 C current rate, exhibiting a capacity retention of 63.29% for the first cycle and delivering approximately 65.30% in the 200th cycle; a satisfactory cycle and rate performance of ～993.3, ～723.1, ～710.7, and ～584.3 mAh g?1 for 1, 3, 5 and 10 C after 200 cycles, respectively; and slight voltage hysteresis. The high capacity is a result of the mesoporous nanostructure, which provides additional volume availability and enhances the capacitive effect. The favourable capacity retention, reasonable rate performance, and cycling stability are attributed to the multilayer structure with additional unobstructed and stable channels for Li+ and electron diffusion.
Engineering a hierarchical hollow hematite nanostructure for lithium storage
Ye, Fei,Hu, Yuncheng,Zhao, Yong,Zhu, Degui,Wang, Yonggui,Pu, Minghua,Mao, Samuel S.
, p. 14687 - 14692 (2016)
In this paper, a new hierarchical hollow α-Fe2O3 nanostructure that has a nanosphere morphology of approximately 250 nm in diameter integrated with ensembles of 15 nm diameter nanotubes is designed and engineered through a simple, economical, and green chemical approach. As an anode material for Li-ion batteries, the engineered hierarchical hollow α-Fe2O3 nanostructure exhibits significantly improved Li storage capability and good cycling stability, with a reversible capacity of 965 mA h g-1 that is retained beyond 200 cycles. Furthermore, this engineered nanostructure showed excellent rate performance superior to that of α-Fe2O3-based battery anodes reported previously.
Development of a Resource-Saving Technology of Catalysts for Medium-Temperature Conversion of Carbon Monoxide in Ammonia Production
Chuyasova, A. A.,Il’in, A. A.,Il’in, A. P.,Lapshin, M. A.,Popov, D. S.,Rumyantsev, R. N.
, p. 1173 - 1177 (2020)
Abstract: The physicochemical characteristics of modern catalysts for the medium-temperature conversion of carbon monoxide to hydrogen in the production of ammonia were studied by X-ray diffraction, scanning electron microscopy, gas chromatography, and thermogravimetric and laser dispersion analyses. It was shown that, along with iron oxide, the catalysts contained promoter additives of Cr, Cu, Ca, and Mn compounds in a total concentration of 1–9 wtpercent. The investigated commercial catalysts have a monodisperse porous structure with a pore size of up to 10 nm and a large surface area from 70 to 120 m2/g. The catalytic activity of the samples was estimated by the conversion of CO in a flow-type plant. At 2.2 MPa and 340 °C it was 89–91percent. The drawback of the catalysts was that the condensate contained rather much ammonia (27.6–45.6 mg/L). It was established that using calcium and copper ferrites and nickel oxide as promoters makes it possible to obtain a catalyst that is not inferior in activity to commercial analogs but has a higher selectivity by reducing the ammonia content of the condensate by 20–30percent.
