Uranium oxide-supported gold catalyst for water–gas shift reaction

Dong, Yuanyuan; Liao, Weiping; Suo, Zhili

doi:10.1016/j.fuproc.2015.04.018

Cited by 12 publications

(9 citation statements)

References 46 publications

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“…The reaction mechanism was postulated to occur via reaction of CO with transition metal oxide hydroxyl groups generating surface formates as intermediates. Metal-supported lanthanide and actinide oxides have also been demonstrated to be remarkable catalysts for CO oxidation at low temperatures in the following order of activity: Au/CeO 2 > Au/UO 3 > Au/Al 2 O 3 > Au/SiO 2 . The Au/UO 3 system was prepared by thermal decomposition of UO 2 (NO 3 ) 2 ·6 H 2 O at 300–400 °C with subsequent impregnation in a basic solution of HAuCl 4 and revealed a CO conversion activity of 54.6% at a temperature of 350 °C .…”

Section: Heterogeneous Catalysis: Small-molecule Activation Using Ura...mentioning

confidence: 99%

“…Metal-supported lanthanide and actinide oxides have also been demonstrated to be remarkable catalysts for CO oxidation at low temperatures in the following order of activity: Au/CeO 2 > Au/UO 3 > Au/Al 2 O 3 > Au/SiO 2 . 149 The Au/UO 3 system was prepared by thermal decomposition of UO 2 (NO 3 ) 2 •6 H 2 O at 300−400 °C with subsequent impregnation in a basic solution of HAuCl 4 and revealed a CO conversion activity of 54.6% at a temperature of 350 °C. 149 However, it was postulated that the catalytic activity is mainly derived from metallic gold with a small amount of oxidized gold species.…”

Section: Heterogeneous Catalysis: Small-molecule Activation Using Ura...mentioning

confidence: 99%

“…149 The Au/UO 3 system was prepared by thermal decomposition of UO 2 (NO 3 ) 2 •6 H 2 O at 300−400 °C with subsequent impregnation in a basic solution of HAuCl 4 and revealed a CO conversion activity of 54.6% at a temperature of 350 °C. 149 However, it was postulated that the catalytic activity is mainly derived from metallic gold with a small amount of oxidized gold species.…”

Section: Heterogeneous Catalysis: Small-molecule Activation Using Ura...mentioning

confidence: 99%

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Chemistry of Actinide Centers in Heterogeneous Catalytic Transformations of Small Molecules

et al. 2019

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The chemistry of actinide molecules and materials has shown remarkable conceptual advancements in the past decade illustrating their unique reactivity profiles, when compared with lanthanides and transition elements, but there are still some challenging questions on the intriguing stability of low valent states and the significant role of 5f orbitals in bonding and reactivity of actinides. The distinctive electronic flexibility of actinide centers makes them potential catalysts for heterogeneous molecular transformations because of the kinetic lability of their coordination states and facile switching among oxidaton states. Actinide-enabled chemical transformations such as the six-electron reduction of dinitrogen into two reactive ammonia molecules or four-electron oxidation of water into oxygen under mild conditions are promising pathways in the quest of high-efficiency heterogeneous catalysts. This Review provides a comprehensive account on actinide-mediated catalytic transformation of small molecules such as CO, CO2, N2, O2, H2O, CH4, HCl, and NH3. The emphasis is placed on the emerging phenomena in actinide-based solid catalysts and controlled synthesis of nanostructured actinide materials as pristine and substrate-grown phases. The mechanistic investigations highlight the influence of the 5f electrons in multielectron transfer reactions and the propensity of actinide centers to achieve higher oxidation states that defines the surface termination in actinide oxides. Finally, the status and perspectives of actinide-containing materials beyond the nuclear fuel applications is discussed, underlining their exciting chemistry and unexplored potential toward alternative catalytic energy production processes.

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Section: Heterogeneous Catalysis: Small-molecule Activation Using Ura...mentioning

confidence: 99%

Section: Heterogeneous Catalysis: Small-molecule Activation Using Ura...mentioning

confidence: 99%

Section: Heterogeneous Catalysis: Small-molecule Activation Using Ura...mentioning

confidence: 99%

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Chemistry of Actinide Centers in Heterogeneous Catalytic Transformations of Small Molecules

et al. 2019

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“…Uranium is used in the nuclear fuel industry (Hore-Lacy, 2016) and it can be applied in electronic industries, semiconductors (Adamska et al, 2015;Bacci et al, 1989), catalysis (Amrute et al, 2013;Dong et al, 2015) and alloys (Ahn et al, 2016;Ghoshal et al, 2014). Given the importance of uranium, many chemical methods have been utilized for the recovery and separation of uranium such as solvent extraction (Ahn et al, 2016;Dartiguelongue et al, 2016;Zhu et al, 2016;Ghoshal et al, 2014), ionic exchange resins, (Chen et al, 2016;Ogden et al, 2017), adsorption over modified adsorbent (Gajowiak et al, 2013;Grabias et al, 2013), liquid emulsion membrane (Biswas et al, 2012;El Sayed, 2003), chelating resin (Donia et al, 2009;Ilaiyaraja et al, 2017), ion inclusion membranes (Kolev et al, 2013;St John et al, 2012) and AC sorption (Afsari et al, 2012;Yakout et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and application of composite derived from rice husk ash with aluminium oxide for sorption of uranium

Youssef

Hagag

Ali

2018

Adsorption Science & Technology

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A composite of rice husk (RH), caustic soda and aluminium oxide was synthesized at 500 C. The activated carbon and amorphous silica dispersed over the aluminium oxide selectively adsorbed uranium in the presence of other elements. At equilibrium time 1 h, phase ratio S/L (0.1 g/10 ml), pH ¼ 5 and uranium initial concentration 120.6 mg/l uranium adsorption efficiency was 96.35%. The uranium stripping efficiency from the load RHA-alumina composite fulfilled 99.9% at 1 h equilibrium time, a phase ratio (S/A) of 0.05 g/10 ml and 0.5 mol/l HNO 3 . The scanning electron microscopy photos revealed that the rice husk ash (RHA)-alumina composite has vacant or regular cavities before the adsorption, and the cavities are fully occupied by uranium after adsorption. The Fourier transform infrared spectroscopy shows a more broadening of the band t ¼ 3526 and 3462 cm À1 which was ascribed to the uranium adsorption. The composite adsorbed 93.75% of uranium from a waste sample. The uranium adsorption exhibited a Langmuir isotherm.

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“…Uranium dioxide (urania) shows a hydrogen evolution electrocatalytic activity when combined with graphene [10]. Nevertheless, uranium oxides were seldom tested as the promoter in catalytic reaction, comparing to the conventional metal oxides [11,12]. However, the unique redox property may endow uranium oxides special advantage in serving as a catalyst promoter.…”

Section: Introductionmentioning

confidence: 99%

二氧化铀-钯-石墨烯纳米复合材料的合成及其催化4-硝基苯酚还原反应的研究

Ding

Zhang

2017

Sci. China Mater.

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Urania-palladium-graphene nanohybrids were synthesized via a solvothermal process in ethylene glycol. With the solvothermal treatment, the Pd nanocrystals surrounded by well-crystallized urania supported on graphene oxide was obtained. This ternary hybrid showed considerably higher catalytic activity than palladium-graphene hybrids toward the reduction of 4-nitrophenol by NaBH4. Besides the smaller sizes of palladium nanoparticles in the ternary hybrids, in which the aggregation of Pd nanoparticles was prevented by urania, the charge transfer between the nano-structured Pd and urania may also contribute to the enhancement of catalytic activity by offering more active sites for adsorption and reaction.

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Uranium oxide-supported gold catalyst for water–gas shift reaction

Cited by 12 publications

References 46 publications

Chemistry of Actinide Centers in Heterogeneous Catalytic Transformations of Small Molecules

Chemistry of Actinide Centers in Heterogeneous Catalytic Transformations of Small Molecules

Synthesis, characterization and application of composite derived from rice husk ash with aluminium oxide for sorption of uranium

二氧化铀-钯-石墨烯纳米复合材料的合成及其催化4-硝基苯酚还原反应的研究

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