Characterization of the thermal decomposition products of ammonium phosphomolybdate hydrate

İlhan, Sedat; Kahruman, Cem; Yusufoğlu, İbrahim

doi:10.1016/j.jaap.2006.09.009

Cited by 19 publications

(12 citation statements)

References 8 publications

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“…The general physiochemical properties, in particular the thermal stability of materials for use in the nuclear industry, are of paramount importance for consideration of operational safety [28]. The thermal stability of AMP is unaffected by irradiation under 800 • C (TGA in Figure 9, DTG in Figure A4), with our results mirroring those of Ilhan et al up to 500 • C [46]. The mass loss between 50 and 100 • C is from evaporation of bound water.…”

Section: Effect Of Irradiation On the Thermal Stability Of Amp And Amsupporting

confidence: 75%

“…From 400 to 470 • C, from ammonia and water (from ammonium ions and hydroxyl groups respectively) are lost, [46] and the Keggin structure of the anion destroyed [47,48]. By 600 • C, AMP has degraded to P 2 O 5 .24MoO 3 [46]. To our knowledge, this represents the extent of published data regarding the thermal degradation of AMP, though some researchers have investigated the thermal recovery of Cs + from AMP via volatilisation [34].…”

Section: Effect Of Irradiation On the Thermal Stability Of Amp And Ammentioning

confidence: 94%

“…The mass loss between 50 and 100 • C is from evaporation of bound water. From 400 to 470 • C, from ammonia and water (from ammonium ions and hydroxyl groups respectively) are lost, [46] and the Keggin structure of the anion destroyed [47,48]. By 600 • C, AMP has degraded to P 2 O 5 .24MoO 3 [46].…”

Section: Effect Of Irradiation On the Thermal Stability Of Amp And Ammentioning

confidence: 99%

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The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

et al. 2019

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Managing certain by-products of the nuclear fuel cycle, such as the radioactive isotopes of caesium: 134Cs, 135Cs and 137Cs is challenging due to their environmental mobility and radioactivity. While a great many materials can isolate Cs+ ions from neutral or basic aqueous solutions via ion exchange, few of these, with the exception of ammonium phosphomolybdate (AMP), function effectively in acidic media. The use of AMP, and its porous composite in polyacrylonitrile (PAN) for management of Cs radioisotopes in various nuclear wastes have been known for decades and are well studied, yet the effects of radiation on the physiochemical properties of such composites have only received limited attention to date. In a previous publication, we demonstrated that a 100 kGy gamma irradiation dose has negligible effect on the ion exchange performance of AMP and AMP–PAN with respect to capacity or kinetics under the Cs+ concentrations and acidity found in spent nuclear fuel (SNF) recycling. As a continuation of this prior study, in this publication we explore the effects of gamma irradiation on the physiochemical properties of AMP and AMP–PAN using a range of characterisation methods. The effects of the same gamma dose on the oxidation state of Mo in AMP and AMP–PAN, the thermal degradation of both AMP and AMP–PAN, combined with a first study into the high-temperature degradation AMP, are reported. The implications of irradiation, its possible mechanism, the conditions present in SNF recycling, and for the end-of-life disposal or recycling of these materials are also discussed.

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Section: Effect Of Irradiation On the Thermal Stability Of Amp And Amsupporting

confidence: 75%

Section: Effect Of Irradiation On the Thermal Stability Of Amp And Ammentioning

confidence: 94%

Section: Effect Of Irradiation On the Thermal Stability Of Amp And Ammentioning

confidence: 99%

See 1 more Smart Citation

The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

et al. 2019

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“…This is an important aspect of using enriched molybdenum as the target material, because recycling of the expensive stable isotope will be cost-effective. As shown previously [19] AMP can be thermally decomposed in the range of 680–753 K according to the reaction Eq (2): …”

Section: Discussionmentioning

confidence: 99%

New precipitation method for isolation of 99mTc from irradiated 100Mo target

Gumiela

Dudek

Bilewicz

2016

J Radioanal Nucl Chem

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Technetium-99m is the most widely used radionuclide in nuclear medicine. This work describes the method to separate 99mTc from irradiated 100Mo target. For this purpose we utilized formation of ammonium molybdenum phosphate (AMP) and have optimized the four parameters of the process. The proposed process is promising and allows fast separation of macroamounts of molybdenum without co-precipitation of 99mTc. The concentration of molybdenum in solution after precipitation of AMP was lower than 300 µg ml−1. Additional purification using AnaLigTc-02 is required to obtain solution with lower concentration of molybdenum.

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“…Reaction time dependence on the formation of MoO 2 at 400 8C-scMoP (400 8C, 2h)c atalyst-mayb ea lso explained by MoO 3 reduction in presence of NH 3, [33] product observed duringt he thermal decomposition of (NH 4 ) 3 PO 4 (MoO 3 ) 12 ·x H 2 O (NH 3 emission starts at 407 8Cu nder air). [34] Moreover and interestingly, Keggin-types tructure is not found when the reference nscMoP is prepared by air calcination, where typical molybdenum(VI)o xide MoO 3 with ac rystallite size around3 5nmw as observed instead (see Ta ble 2f or phases comparison).…”

Section: Introductionmentioning

confidence: 99%

Supercritical CO₂ Assisted Preparation of Supported Molybdenum Phosphide for Hydrotreating Catalysis

et al. 2017

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Many studies in literature have reported supported metal phosphides as promising hydrotreating catalysts. The synthesis of highly dispersed metal phosphide nanoparticles is usually achieved tuning various parameters such as the nature of the phosphorous precursor or the reduction protocol. In this study, the alumina supported molybdenum phosphides were prepared following a newly developed method using supercritical fluids (SCFs) technology including several elementary steps: incipient wetness impregnation and ageing, supercritical CO2 flash‐drying, followed by hydrogen reduction. Experimental parameters allowed us modulating main characteristics of catalysts: crystallinity, reducibility, nanoparticles (NPs) mean size and size distribution. High temperature treatments (400 °C) in scCO2 media lead to the presence of heteropolyanions unlike what is observed in conventional treatment under air. Catalytic performances in selective hydrodesulfurization of methyl‐3‐thiophene, in presence of 2,3‐dimethylbut‐2‐ene, have been assessed and were improved in terms of activity or selectivity compared to MoP and CoMoS reference catalysts, respectively.

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Characterization of the thermal decomposition products of ammonium phosphomolybdate hydrate

Cited by 19 publications

References 8 publications

The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

New precipitation method for isolation of 99mTc from irradiated 100Mo target

Supercritical CO₂ Assisted Preparation of Supported Molybdenum Phosphide for Hydrotreating Catalysis

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Characterization of the thermal decomposition products of ammonium phosphomolybdate hydrate

Cited by 19 publications

References 8 publications

The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

New precipitation method for isolation of 99mTc from irradiated 100Mo target

Supercritical CO2 Assisted Preparation of Supported Molybdenum Phosphide for Hydrotreating Catalysis

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Supercritical CO₂ Assisted Preparation of Supported Molybdenum Phosphide for Hydrotreating Catalysis