New type of carbon coated alumina supports for the preparation of highly ctive ruthenium catalysts for ammonia synthesis

Rao, K. Srinivasa; Rao, P. Kanta; Masthan, S. Khaja; Kaluschnaya, Leena; Shur, V. B.

doi:10.1016/s0166-9834(00)82229-0

Cited by 37 publications

(12 citation statements)

References 7 publications

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“…6 One particular mixed oxide, CoFe 2 O 4 , has the highest magnetocrystalline anisotropy of all iron-containing spinels. 7 The applications of Co-Fe spinel oxides span from permanent magnets, 8 and a) juan.delafiguera@iqfr.csic.es spintronic devices, 9-13 through catalysis [14][15][16][17][18][19] to electrochemistry where they are proposed as high-performance anodes in Li-batteries. [20][21][22] The catalytic properties of specific oxides stem partially from the particular arrangement of Fe and Co cations at the surface under the given operation conditions.…”

Section: Introductionmentioning

confidence: 99%

Co on Fe3O4(001): Towards precise control of surface properties

Gargallo-Caballero

Martín-García

Quesada

et al. 2016

The Journal of Chemical Physics

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A novel approach to incorporate cobalt atoms into a magnetite single crystal is demonstrated by a combination of x-ray spectro-microscopy, low-energy electron diffraction, and density-functional theory calculations. Co is deposited at room temperature on the reconstructed magnetite (001) surface filling first the subsurface octahedral vacancies and then occupying adatom sites on the surface. Progressive annealing treatments at temperatures up to 733 K diffuse the Co atoms into deeper crystal positions, mainly into octahedral ones with a marked inversion level. The oxidation state, coordination, and magnetic moments of the cobalt atoms are followed from their adsorption to their final incorporation into the bulk, mostly as octahedral Co2+. This precise control of the near-surface Co atoms location opens up the way to accurately tune the surface physical and magnetic properties of mixed spinel oxides.

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Section: Introductionmentioning

confidence: 99%

Co on Fe3O4(001): Towards precise control of surface properties

Gargallo-Caballero

Martín-García

Quesada

et al. 2016

The Journal of Chemical Physics

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“…Various supports, such as active carbon and graphite [2][3][4][5][6][7][8][9], alumina [10][11][12][13], carbon-coated alumina [14,15], magnesia [16][17][18][19], a series of zeolites [20][21][22] and even rare-earth metal oxides [23,24] were used in Ru-based catalysts for the ammonia synthesis. The promoters used are mainly alkali metal, alkaline earth metal, rare earth metal and their oxides or hydroxides.…”

Section: Introductionmentioning

confidence: 99%

Ammonia synthesis over Ru/C catalysts with different carbon supports promoted by barium and potassium compounds

Liang

Wei

Xin

et al. 2001

Applied Catalysis A: General

170

104

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“…Although the reason needs further study, carbon is an ideal support for Ru catalysts at synthetic pressure higher than 5 MPa. Rao et al found that the addition of carbon into alumina increased the ammonia synthesis activity, but no detailed characterization has been provided. , Datye and co-workers proposed that the presence of carbon layers could change the surface properties and increase the hydrothermal stability of oxides. , Prins proposed that the spillover of H atoms from metal particles to a carbon support is easier than that to a nonreducible oxide . Wang et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of Using Carbon-Coated Alumina as Support for Ba-Promoted Ru Catalyst in Ammonia Synthesis

Lin

Heng

Yin

et al. 2019

Ind. Eng. Chem. Res.

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Ru catalysts using alumina (Al 2 O 3 ) as support are inferior in ammonia synthesis. In the present study, we coated alumina with carbon to enhance the activity of Bapromoted Ru/Al 2 O 3 catalyst. The support obtained in sucrose pyrolysis is herein denoted as sC−Al 2 O 3 while that through acetylene decomposition as gC−Al 2 O 3 . It is observed that sC− Al 2 O 3 is with carbon homogeneously dispersed on the surface. In the case of gC−Al 2 O 3 , the dispersion of surface carbon is inhomogeneous. Enhanced catalyst activity and stability in ammonia synthesis are observed over the Ba-promoted Ru catalyst that is supported on gC−Al 2 O 3 . The phenomenon is attributed to a combination of surface hydrogen enrichment, lowering of nitrogen desorption temperature, and hydrogen desorption through a favorable H 2 -formation pathway. This research provides a new approach for the design of high-performance catalysts not only for ammonia synthesis but also for catalytic reactions where the tuning of hydrogen adsorption and desorption is critical.

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New type of carbon coated alumina supports for the preparation of highly ctive ruthenium catalysts for ammonia synthesis

Cited by 37 publications

References 7 publications

Co on Fe3O4(001): Towards precise control of surface properties

Co on Fe3O4(001): Towards precise control of surface properties

Ammonia synthesis over Ru/C catalysts with different carbon supports promoted by barium and potassium compounds

Effects of Using Carbon-Coated Alumina as Support for Ba-Promoted Ru Catalyst in Ammonia Synthesis

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