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240520|2023 sz s a eng d |
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|a 10.3390/nano13192641
|2 doi
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|a koha001139652
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|b rus
|c RU-ToGU
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|a Ni-based SBA-15 catalysts modified with CeMnOx for CO2 valorization via dry reforming of methane: Effect of composition on modulating activity and H2/CO ratio
|c M. V. Grabchenko, N. V. Dorofeeva, V. A. Svetlichnyi [et al.]
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|a Текст
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|a электронный
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|a Библиогр.: 52 назв.
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|a Dry reforming of methane with ratio CH4/CO2 = 1 is studied using supported Ni catalysts on SBA-15 modified by CeMnOx mixed oxides with different Ce/Mn ratios (0.25, 1 and 9). The obtained samples are characterized by wide-angle XRD, SAXS, N2 sorption, TPR-H2, TEM, UV–vis and Raman spectroscopies. The SBA-15 modification with CeMnOx decreases the sizes of NiO nanoparticles and enhances the NiO–support interaction. When Ce/Mn = 9, the NiO forms small particles on the surface of large CeO2 particles and/or interacts with CeO2, forming mixed phases. The best catalytic performance (at 650 C, CH4 and CO2 conversions are 51 and 69%, respectively) is achieved over the Ni/CeMnOx/SBA-15 (9:1) catalyst. The peculiar CeMnOx composition (Ce/Mn = 9) also improves the catalyst stability: In a 24 h stability test, the CH4 conversion decreases by 18 rel.% as compared to a 30 rel.% decrease for unmodified catalyst. The enhanced catalytic stability of Ni/CeMnOx/SBA-15 (9:1) is attributed to the high concentration of reactive peroxo (O-) and superoxo (O2-) species that significantly lower the amount of coke in comparison with Ni-SBA-15 unmodified catalyst (weight loss of 2.7% vs. 42.2%). Ni-SBA-15 modified with equimolar Ce/Mn ratio or Mn excess is less performing. Ni/CeMnOx/SBA-15 (1:4) with the highest content of manganese shows the minimum conversions of reagents in the entire temperature range (X(CO2) = 4–36%, X(CH4) = 8–58%). This finding is possibly attributed to the presence of manganese oxide, which decorates the Ni particles due to its redistribution at the preparation stage.
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|a конверсия метана
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| 653 |
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|a рамановская спектроскопия
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|a сухой риформинг метана
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|a статьи в журналах
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|a Grabchenko, Maria V.
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|a Dorofeeva, Nataliya V.
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|a Svetlichnyi, Valerii A.
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|a Larichev, Yurii V.
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|a La Parola, Valeria
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|a Liotta, Leonarda Francesca
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|a Kulinich, Sergei A.
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|a Vodyankina, Olga V.
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|t Nanomaterials
|d 2023
|g Vol. 13, № 19. P. 2641 (1-20)
|x 2079-4991
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|a RU-ToGU
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|u http://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001139652
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|a статья
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|c 1139652
|d 1139652
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