Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry Reforming
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...
| 出版年: | Nanomaterials |
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| 主要な著者: | , , , , , , |
| フォーマット: | 論文 |
| 言語: | 英語 |
| 出版事項: |
MDPI AG
2020-06-01
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| 主題: | |
| オンライン･アクセス: | https://www.mdpi.com/2079-4991/10/7/1281 |
| _version_ | 1850409269564801024 |
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| author | Mikhail Simonov Yulia Bespalko Ekaterina Smal Konstantin Valeev Valeria Fedorova Tamara Krieger Vladislav Sadykov |
| author_facet | Mikhail Simonov Yulia Bespalko Ekaterina Smal Konstantin Valeev Valeria Fedorova Tamara Krieger Vladislav Sadykov |
| author_sort | Mikhail Simonov |
| collection | DOAJ |
| container_title | Nanomaterials |
| description | 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. |
| format | Article |
| id | doaj-art-c7eeed5b2dbc4657bde7ece2db2f4ad2 |
| institution | Directory of Open Access Journals |
| issn | 2079-4991 |
| language | English |
| publishDate | 2020-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| spelling | doaj-art-c7eeed5b2dbc4657bde7ece2db2f4ad22025-08-19T22:47:19ZengMDPI AGNanomaterials2079-49912020-06-01107128110.3390/nano10071281Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry ReformingMikhail Simonov0Yulia Bespalko1Ekaterina Smal2Konstantin Valeev3Valeria Fedorova4Tamara Krieger5Vladislav Sadykov6Laboratory of Deep Oxidation Catalysts, Boreskov Institute of Catalysis, 630090 Novosibirsk, RussiaLaboratory of Deep Oxidation Catalysts, Boreskov Institute of Catalysis, 630090 Novosibirsk, RussiaLaboratory of Deep Oxidation Catalysts, Boreskov Institute of Catalysis, 630090 Novosibirsk, RussiaLaboratory of Deep Oxidation Catalysts, Boreskov Institute of Catalysis, 630090 Novosibirsk, RussiaLaboratory of Deep Oxidation Catalysts, Boreskov Institute of Catalysis, 630090 Novosibirsk, RussiaLaboratory of Deep Oxidation Catalysts, Boreskov Institute of Catalysis, 630090 Novosibirsk, RussiaLaboratory of Deep Oxidation Catalysts, Boreskov Institute of Catalysis, 630090 Novosibirsk, RussiaNickel-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.https://www.mdpi.com/2079-4991/10/7/1281methane dry reformingsupercritical synthesisfluoriteheterogeneous catalysis |
| spellingShingle | Mikhail Simonov Yulia Bespalko Ekaterina Smal Konstantin Valeev Valeria Fedorova Tamara Krieger Vladislav Sadykov Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry Reforming methane dry reforming supercritical synthesis fluorite heterogeneous catalysis |
| title | Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry Reforming |
| title_full | Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry Reforming |
| title_fullStr | Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry Reforming |
| title_full_unstemmed | Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry Reforming |
| title_short | Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry Reforming |
| title_sort | nickel containing ceria zirconia doped with ti and nb effect of support composition and preparation method on catalytic activity in methane dry reforming |
| topic | methane dry reforming supercritical synthesis fluorite heterogeneous catalysis |
| url | https://www.mdpi.com/2079-4991/10/7/1281 |
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