FePO Catalysts for the Selective Oxidative Dehydrogenation of Isobutyric Acid into Methacrylic Acid

Millet, J.M.M.

doi:10.1080/01614949808007104

Cited by 62 publications

(17 citation statements)

References 44 publications

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“…Iron phosphate, as an environmental-friendly phosphate, were mainly applied in areas of work involving catalysts [41], ceramic glass [42], adsorption [43, 44], steel and surface passivation [45], based on its non-pollution, low price and excellent physical and chemical properties [41–46]. In the wide environment, U(VI) could strongly assiciate with solid minerals, in particular, iron-containing phases, as reported for controlling U(VI) adsorption and transportation [47, 48].…”

Section: Introductionmentioning

confidence: 99%

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

Xiao

et al. 2019

Journal of Hazardous Materials

105

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In this study, the ultra-thin iron phosphate Fe7(PO4)6 nanosheets (FP1) with fine-controlled morphology, has been designed as a new two-dimensional (2D) material for uranium adsorption. Due to its unique high accessible 2D structure, atom-dispersed phosphate/iron anchor groups and high specific surface area (27.77 m2·g−1), FP1 shows an extreme-high U(VI) adsorption capacity (704.23 mg·g−1 at 298 K, pH = 5.0 ± 0.1), which is about 27 times of conventional 3D Fe7(PO4)6 (24.51 mg·g−1-sample FP2) and higher than most 2D absorbent materials, showing a great value in the treatment of radioactive wastewater. According to the adsorption results, the sorption between U(VI) and FP1 is spontaneous and endothermic, and can be conformed to single molecular layer adsorption. Based on the analyses of FESEM, EDS, Mapping, FT-IR and XRD after adsorption, the possibile adsorption mechanism can be described as a Monolayer Surface Complexation and Stacking mode (MSCS-Mode). Additionally, the research not only provide a novel preparing method for 2D phosphate materials but also pave a new pathway to study other two-dimensional adsorption materials.

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Section: Introductionmentioning

confidence: 99%

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

Xiao

et al. 2019

Journal of Hazardous Materials

105

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“…Transition-metal phosphates offer great structural and chemical diversity, which allows for interesting physical properties and therefore opens up a great portfolio of possible applications, for example in adsorption, 1 semiconductive glasses, 2 nonlinear optics, 3 catalysis, [4][5][6][7] and batteries. [8][9][10][11] In particular iron phosphates have been the object of considerable study because of the relative abundance of iron in nature, 8,12 whereas cobalt phosphates have been less investigated.…”

Section: Introductionmentioning

confidence: 99%

Co₁₁Li[(OH)₅O][(PO₃OH)(PO₄)₅], a Lithium-Stabilized, Mixed-Valent Cobalt(II,III) Hydroxide Phosphate Framework

et al. 2017

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A new metastable phase, featuring a lithium-stabilized mixed-valence cobalt(II,III) hydroxide phosphate framework, CoLi[(OH)O][(POOH)(PO)], corresponding to the simplified composition CoLi(OH)PO, is prepared by hydrothermal synthesis. Because the pH-dependent formation of other phases such as Co(OH)(POOH) and olivine-type LiCoPO competes in the process, a pH value of 5.0 is crucial for obtaining a single-phase material. The crystals with dimensions of 15 μm × 30 μm exhibit a unique elongated triangular pyramid morphology with a lamellar fine structure. Powder X-ray diffraction experiments reveal that the phase is isostructural with the natural phosphate minerals holtedahlite and satterlyite, and crystallizes in the trigonal space group P31m (a = 11.2533(4) Å, c = 4.9940(2) Å, V = 547.70(3) Å, Z = 1). The three-dimensional network structure is characterized by partially Li-substituted, octahedral [MO(OH)] (M = Co, Li) dimer units which form double chains that run along the [001] direction and are connected by [PO] and [PO(OH)] tetrahedra. Because no Li-free P31m-type Co(OH)PO phase could be prepared, it can be assumed that the Li ions are crucial for the stabilization of the framework. Co L-edge X-ray absorption spectroscopy demonstrates that the cobalt ions adopt the oxidation states +2 and +3 and hence provides further evidence for the incorporation of Li in the charge-balanced framework. The presence of three independent hydroxyl groups is further confirmed by infrared spectroscopy. Magnetization measurements imply a paramagnetic to antiferromagnetic transition at around T = 25 K as well as a second transition at around 9-12 K with a ferromagnetic component below this temperature. The metastable character of the phase is demonstrated by thermogravimetric analysis and differential scanning calorimetry, which above 558 °C reveal a two-step decomposition to CoO, Co(PO), and olivine-type LiCoPO with release of water and oxygen.

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“…The Ps ource was neededt om aintain ac onstant P/Fe ratio at the surfaceo f the catalyst. [43] VPO catalysts showed the migration of Ps pecies to the surfacea nd ad ecreasing amount of Pi nt he catalyst during water vapor treatment. The excess of Po nt he surface suppressed the oxidation of VPOc atalysts and hindered the formation of active sites for oxidation reactions.…”

Section: Catalytic Performancementioning

confidence: 99%

Role of Vanadium and Phosphorus in Substituted Keggin‐Type Heteropolyoxo Molybdates Supported on Silica SBA‐15 in Selective Propene Oxidation

2015

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Vanadium‐containing Keggin‐type heteropolyoxo molybdate ([PV2Mo10O40]5−) was supported on silica SBA‐15 (denoted as PV2Mo10‐SBA‐15). The structural evolution and catalytic activity of PV2Mo10‐SBA‐15 and a suitable reference V2Mo10Ox‐SBA‐15 were investigated under selective propene oxidation conditions by using in situ X‐ray absorption spectroscopy. 31P MAS NMR measurements of supported PV2Mo10‐SBA‐15 and reference H3PO4‐SBA‐15 were performed after the catalytic reaction. PV2Mo10‐SBA‐15 formed a mixture of mainly tetrahedral [MoOx] and [VOx] units during thermal treatment under propene oxidation conditions. Changes in the average local structure around V centers coincided with the changes in the average local structure around Mo centers and the onset of catalytic activity. In addition, mainly tetrahedral [MoOx] and [VOx] units seemed to be in close proximity and interacted under catalytic conditions. Conversely, in the reference material V2Mo10Ox‐SBA‐15 synthesized with individual V and Mo source precursors, Mo and V centers appeared to be more separated from each other. The structural environment of P in PV2Mo10‐SBA‐15 under catalytic conditions corresponded to a mixture of various species. P was connected to both the support material SBA‐15 via POSi bonds and [MoOx] or [VOx] units. Apparently, the proximity of V and Mo in Keggin precursors was a prerequisite for obtaining (Mo,V) oxide species on the support material.

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FePO Catalysts for the Selective Oxidative Dehydrogenation of Isobutyric Acid into Methacrylic Acid

Cited by 62 publications

References 44 publications

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

Co₁₁Li[(OH)₅O][(PO₃OH)(PO₄)₅], a Lithium-Stabilized, Mixed-Valent Cobalt(II,III) Hydroxide Phosphate Framework

Role of Vanadium and Phosphorus in Substituted Keggin‐Type Heteropolyoxo Molybdates Supported on Silica SBA‐15 in Selective Propene Oxidation

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FePO Catalysts for the Selective Oxidative Dehydrogenation of Isobutyric Acid into Methacrylic Acid

Cited by 62 publications

References 44 publications

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

Co11Li[(OH)5O][(PO3OH)(PO4)5], a Lithium-Stabilized, Mixed-Valent Cobalt(II,III) Hydroxide Phosphate Framework

Role of Vanadium and Phosphorus in Substituted Keggin‐Type Heteropolyoxo Molybdates Supported on Silica SBA‐15 in Selective Propene Oxidation

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Co₁₁Li[(OH)₅O][(PO₃OH)(PO₄)₅], a Lithium-Stabilized, Mixed-Valent Cobalt(II,III) Hydroxide Phosphate Framework