Nickel‐containing ceria‐zirconia doped with Ti and Nb. Effect of support composition and preparation method on catalytic activity in methane dry reforming

Mikhail Simonov, Yulia Bespalko, Ekaterina Smal, Konstantin Valeev, Valeria Fedorova, Tamara Krieger, Vladislav Sadykov

Результат исследования: Научные публикации в периодических изданияхстатья

Аннотация

Nickel‐containing mixed ceria‐zirconia oxides also doped by Nb and Ti have been prepared by a citrate route and by original solvothermal continuous flow synthesis in supercritical alcohols. Nickel was subsequently deposited by conventional insipient wetness impregnation. The oxides are comprised of ceria‐zirconia solid solution with cubic fluorite phase. Negligible amounts of impurities of zirconia are observed for samples prepared by citrate route and doped by Ti. Supports prepared by supercritical synthesis are single‐phased. XRD data, Raman, and UV‐Vis DR (diffuse reflectance) spectroscopy suggest increasing lattice parameter and amount of oxygen vacancies in fluorite structure after Nb and Ti incorporation despite of the preparation method. These structural changes correlate with the catalytic activity in a methane dry reforming reaction. Catalysts synthesized under supercritical conditions are more active than the catalysts of the same composition prepared by the citrate route. The catalytic activity of samples doped with Ti and Nb is two times higher in terms of TOF (turnover frequency) and increased stability of these catalysts is attributed with the highest oxygen mobility being crucial for gasification of coke precursors.

Язык оригиналаанглийский
Номер статьи1281
Страницы (с-по)1-19
Число страниц19
ЖурналNanomaterials
Том10
Номер выпуска7
DOI
СостояниеОпубликовано - июл 2020

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