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Article

Improved Water–Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO2 Addition

1
Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
2
Department of Catalysis and Chemical Engineering, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, 11000 Belgrade, Serbia
3
Istituto per lo Studio dei Materiali Nanostrutturati, CNR, 90146 Palermo, Italy
4
Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, 060021 Bucharest, Romania
*
Authors to whom correspondence should be addressed.
Academic Editor: John Vakros
Nanomaterials 2021, 11(2), 366; https://doi.org/10.3390/nano11020366
Received: 8 January 2021 / Revised: 22 January 2021 / Accepted: 25 January 2021 / Published: 2 February 2021
Supported gold on co-precipitated nanosized NiAl layered double hydroxides (LDHs) was studied as an effective catalyst for medium-temperature water–gas shift (WGS) reaction, an industrial catalytic process traditionally applied for the reduction in the amount of CO in the synthesis gas and production of pure hydrogen. The motivation of the present study was to improve the performance of the Au/NiAl catalyst via modification by CeO2. An innovative approach for the direct deposition of ceria (1, 3 or 5 wt.%) on NiAl-LDH, based on the precipitation of Ce3+ ions with 1M NaOH, was developed. The proposed method allows us to obtain the CeO2 phase and to preserve the NiAl layered structure by avoiding the calcination treatment. The synthesis of Au-containing samples was performed through the deposition–precipitation method. The as-prepared and WGS-tested samples were characterized by X-ray powder diffraction, N2-physisorption and X-ray photoelectron spectroscopy in order to clarify the effects of Au and CeO2 loading on the structure, phase composition, textural and electronic properties and activity of the catalysts. The reduction behavior of the studied samples was evaluated by temperature-programmed reduction. The WGS performance of Au/NiAl catalysts was significantly affected by the addition of CeO2. A favorable role of ceria was revealed by comparison of CO conversion degree at 220 °C reached by 3 wt.% CeO2-modified and ceria-free Au/NiAl samples (98.8 and 83.4%, respectively). It can be stated that tuning the properties of Au/NiAl LDH via CeO2 addition offers catalysts with possibilities for practical application owing to innovative synthesis and improved WGS performance. View Full-Text
Keywords: Ni-Al layered double hydroxides; gold catalyst; CeO2 addition; water–gas shift reaction Ni-Al layered double hydroxides; gold catalyst; CeO2 addition; water–gas shift reaction
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MDPI and ACS Style

Gabrovska, M.; Ivanov, I.; Nikolova, D.; Krstić, J.; Venezia, A.M.; Crişan, D.; Crişan, M.; Tenchev, K.; Idakiev, V.; Tabakova, T. Improved Water–Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO2 Addition. Nanomaterials 2021, 11, 366. https://doi.org/10.3390/nano11020366

AMA Style

Gabrovska M, Ivanov I, Nikolova D, Krstić J, Venezia AM, Crişan D, Crişan M, Tenchev K, Idakiev V, Tabakova T. Improved Water–Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO2 Addition. Nanomaterials. 2021; 11(2):366. https://doi.org/10.3390/nano11020366

Chicago/Turabian Style

Gabrovska, Margarita, Ivan Ivanov, Dimitrinka Nikolova, Jugoslav Krstić, Anna Maria Venezia, Dorel Crişan, Maria Crişan, Krassimir Tenchev, Vasko Idakiev, and Tatyana Tabakova. 2021. "Improved Water–Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO2 Addition" Nanomaterials 11, no. 2: 366. https://doi.org/10.3390/nano11020366

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