Concerning uranate formation in alkali nitrate melts

Toussaint, C.J.; Avogadro, A.

doi:10.1016/0022-1902(74)80811-0

Cited by 32 publications

(6 citation statements)

References 2 publications

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“…To probe the role of the type of the salt and its melting/decomposition temperature, experiments were carried out in the packed bed reactor at 500 °C using OCs derived by impregnating the perovskite with different salts, i.e., RbNO 3 , CsNO 3 , or Na 2 CO 3 . The melting temperature of RbNO 3 is ≈310 °C, [ 46 ] ≈414 °C for CsNO 3 , [ 47 ] and ≈890 °C for Na 2 CO 3 . [ 48 ] The decomposition temperatures of RbNO 3 and CsNO 3 in air are ≈540 and ≈585 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Highly Selective Oxidative Dehydrogenation of Ethane to Ethylene via Chemical Looping with Oxygen Uncoupling through Structural Engineering of the Oxygen Carrier

Luongo

Donat

Bork

et al. 2022

Advanced Energy Materials

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The oxidative dehydrogenation of ethane (ODH) to produce ethylene offers advantages compared to the industry standard steam cracking, but its industrial application is hindered by costly air separation units needed to supply oxygen. A chemical‐looping‐based oxidative dehydrogenation (CL‐ODH) scheme is presented, in which oxygen carriers supply gaseous oxygen in situ, which then reacts with ethane in the presence of a catalyst at a comparatively low temperature (500 °C). A common challenge of chemical looping processes beyond combustion is to suppress the overoxidation of hydrocarbons to COx to enable high product yields. It is demonstrated that the overoxidation of ethane can be eliminated completely through structural engineering of the perovskite oxygen carrier involving alkali‐metal‐based carbonate coatings, while maintaining the materials’ ability to generate oxygen. Through CL‐ODH, higher ethylene selectivity (≈91%) and yields (≈39%) are achieved compared to the conventional ODH scheme without oxygen carrier and cofeeding air/ethane. 18O‐labeling experiments demonstrate that the carbonate layer functions like a diffusion barrier for ethane while being permeable for oxygen. Both the CL‐ODH scheme and the material design strategy can be extended to other catalytic oxidation or dehydrogenation reactions requiring oxygen at different temperatures, offering enormous potential to intensify such processes.

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Section: Resultsmentioning

confidence: 99%

“…[ 48 ] The decomposition temperatures of RbNO 3 and CsNO 3 in air are ≈540 and ≈585 °C, respectively. [ 46,47 ]…”

Section: Resultsmentioning

confidence: 99%

Highly Selective Oxidative Dehydrogenation of Ethane to Ethylene via Chemical Looping with Oxygen Uncoupling through Structural Engineering of the Oxygen Carrier

Luongo

Donat

Bork

et al. 2022

Advanced Energy Materials

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“…The XRD patterns obtained for mixed uranates (K x Na 1−x ) 2 U 2 O 7 where x = 0.25, 0.4, 0.6, 0.8 and 1.0 were similar except for some shift in the line positions to lower angle with increase in concentration of potassium. In the Na-K-U-O system, solubility of K in Na 2 U 2 O 7 forming (Na, K) 2 U 2 O 7 is reported up to 2.6 mol% of K [7]. M 2 U 2 O 7 (M = Na, K and Rb) are reported to have rhombohedral, orthorhombic and monoclinic structure [8,9].…”

Section: Tg Dta and X-ray Studiesmentioning

confidence: 97%

“…KUO 3 forms complete range of solid solution with RbUO 3, but has limited range of solid solubility with BaUO 3 [6]. In Na-K-U-O quaternary system, a limited range of solid solubility of Na 2 U 2 O 7 in K 2 U 2 O 7 is reported by the reaction of UO 2 with molten alkali nitrate mixture [7]. However, no literature is available on the solid solubility of KUO 3 or RbUO 3 with NaUO 3 .…”

Section: Introductionmentioning

confidence: 98%

Thermal and X-ray studies on mixed alkali uranates of Na–K–U–O system

Sali

Kulkarni

Mudher

2006

Journal of Alloys and Compounds

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“…During the treatment of fuel materials with various salts to dissolve them in dilute acid, identification of the solid products formed is helpful to know the minimum temperature of reactions [16] and to determine the minimum amount of salt required for the completion of the reaction [17].…”

Section: Dissolution Studiesmentioning

confidence: 99%