Hydrogen production by autothermal reforming of methane over lanthanum chromites modified with Ru and Sr

Mota, N.; Исмагилов, И.З.; Матус, Е. В.; Kuznetsov, V. V.; Керженцев, М. А.; Ismagilov, Z. R.; Navarro, R.M.; Fierro, J.L.G.

doi:10.1016/j.ijhydene.2016.05.029

Cited by 28 publications

(12 citation statements)

References 36 publications

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“…No trace of impurity peaks can be found when Dy 3+ and Eu 3+ ions are introduced into the system. Compared with the pure SrWO 4 , the diffraction peaks of the Eu 3+ , Dy 3+ single-doped and Eu 3+ /Dy 3+ co-doped SrWO 4 exhibit a slight shift toward high-angle side, due to substitution of Sr 2+ (1.26 Å, CN = 8) ions by smaller size Dy 3+ (1.03 Å, CN = 8) and Eu 3+ (1.07 Å, CN = 8) ions, which revealing that Dy 3+ and Eu 3+ ions have been successfully doped into the system 18 , 19 . Figure 2 shows the unit cell parameters of a (Å) and c (Å) as well as unit cell volume (Å 3 ).…”

Section: Resultsmentioning

confidence: 95%

A novel optical thermometry based on the energy transfer from charge transfer band to Eu3+-Dy3+ ions

Wang

et al. 2017

Sci Rep

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Optical thermometry based on the up-conversion intensity ratio of thermally coupled levels of rare earth ions has been widely studied to achieve an inaccessible temperature measurement in submicron scale. In this work, a novel optical temperature sensing strategy based on the energy transfer from charge transfer bands of W-O and Eu-O to Eu3+-Dy3+ ions is proposed. A series of Eu3+/Dy3+ co-doped SrWO4 is synthesized by the conventional high-temperature solid-state method. It is found that the emission spectra, emission intensity ratio of Dy3+ (572 nm) and Eu3+ (615 nm), fluorescence color, lifetime decay curves of Dy3+ (572 nm) and Eu3+ (615 nm), and relative and absolute sensitivities of Eu3+/Dy3+ co-doped SrWO4 are temperature dependent under the 266 nm excitation in the temperature range from 11 K to 529 K. The emission intensity ratio of Dy3+ (572 nm) and Eu3+ (615 nm) ions exhibits exponentially relation to the temperature due to the different energy transfer from the charge transfer bands of W-O and Eu-O to Dy3+ and Eu3+ ions. In this host, the maximum relative sensitivity Sr can be reached at 1.71% K−1, being higher than those previously reported material. It opens a new route to obtain optical thermometry with high sensitivity through using down-conversion fluorescence under ultraviolet excitation.

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Section: Resultsmentioning

confidence: 95%

A novel optical thermometry based on the energy transfer from charge transfer band to Eu3+-Dy3+ ions

Wang

et al. 2017

Sci Rep

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“…It was shown that modification of supports is an effective way to control the catalyst performance in reforming of fuels [24][25][26][27][28][29][30]. This study is devoted to the elucidation of the role of support composition in autothermal reforming of ethanol over Ni/Ce 1-x Gd x O y , Ni/Ce 1-x La x O y and Ni/Ce 1-x Mg x O y catalysts.…”

Section: Introductionmentioning

confidence: 99%

Control of Ni/Ce1-xMxOy Catalyst Properties Via the Selection of Dopant M = Gd, La, Mg. Part 2. Catalytic Activity

Керженцев

Матус

Исмагилов

et al. 2018

Eurasian Chem. Tech. J.

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To elucidate the role of support composition in autothermal reforming of ethanol (ATR of C2H5OH), a series of Ni catalysts (Ni content 2–15 wt.%) supported on different ceria-based oxides (Ce1-xGdxOy, Ce1-xLaxOy and Ce1-xMgxOy; x = 0.1–0.9) were prepared. The synthetized materials were tested in ATR of ethanol at 200–700 °C. It was established that supports themselves show catalytic activity in ATR of C2H5OH and provide 10–15% yield of H2 at 700 °C. Upon the increase of Ni content from 2 to 15 wt.% the temperature of 100% ethanol conversion decreases from 700 tо 300 °С, hydrogen yield increases from 25 to 60%, the inhibition of С2-С3 by-products formation, as well as the promotion of decomposition of acetaldehyde occur. The enhancement of catalyst performance in ATR of C2H5OH has been observed in the next series of supports: Ce1-xMgxOy < Ce1-xGdxOy < Ce1-xLaxOy and with a decrease of x to an optimal value that correlates with the improvement of Ni active component reducibility. At 600 °C on 10Ni/Ce0.8La0.2O1.9 catalyst the H2 yield of 50% was achieved at C2H5OH conversion of 100%. Stable and high performance of developed catalysts in ATR of C2H5OH indicates the promise of their use in the production of hydrogen.

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“…This study continues our works on optimization of catalyst performance through regulation of support characteristics [2,[29][30][31][32][33][34] and it is focused on the elucidation of the role of Ce…”

Section: Introductionmentioning

confidence: 59%

Control of Ni/Ce1-xMxOy Catalyst Properties Via the Selection of Dopant M = Gd, La, Mg. Part 1. Physicochemical Characteristics

Керженцев¹,

Матус

Исмагилов

et al. 2018

Eurasian Chem. Tech. J.

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To develop effective reforming catalyst a series of Ni catalysts (Ni content 2‒15 wt.%) supported on ceria-based oxides Ce1-xMxOy were synthesized by incipient wetness impregnation. To regulate dispersion and reducibility of the active component, the variation of chemical composition of support was performed. The prepared samples of supports and catalysts were characterized by X-ray spectral fluorescence analysis, N2 adsorption/desorption, X-ray diffraction, transmission electron microscopy, and thermal analysis. It was found that the support composition specified the forms of stabilization (NiO or Ni-M-O oxides, M = La, Mg) and capability to reduction of Ni-component through the realization of a different extent of interaction between Ni-containing species and support. The increase of M content in CexM1-xOy support induces the decrease of CexM1-xOy crystallite size, improvement of Ni active component dispersion and the increase of hard-to-reduce portion of nickel cations due to the growth in the degree of nickel- CexM1-xOy interaction. The identified variation of the textural, structural and redox characteristics of the Ni/CexM1-xOy catalysts should influence their performance in the catalytic process.

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Hydrogen production by autothermal reforming of methane over lanthanum chromites modified with Ru and Sr

Cited by 28 publications

References 36 publications

A novel optical thermometry based on the energy transfer from charge transfer band to Eu3+-Dy3+ ions

A novel optical thermometry based on the energy transfer from charge transfer band to Eu3+-Dy3+ ions

Control of Ni/Ce1-xMxOy Catalyst Properties Via the Selection of Dopant M = Gd, La, Mg. Part 2. Catalytic Activity

Control of Ni/Ce1-xMxOy Catalyst Properties Via the Selection of Dopant M = Gd, La, Mg. Part 1. Physicochemical Characteristics

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